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I have a cattapillar 950 F loader with serial#8tk01717 that

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will not go into 4th...
I have a cattapillar 950 F loader with serial#8tk01717 that will not go into 4th gear?
Submitted: 1 year ago.Category: Construction and Road Equipment
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Answered in 1 hour by:
2/18/2016
Mechanic: Dan, Technician replied 1 year ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 5,704
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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HYi my name is***** will be glad to help. Check the oil level and condition for signs of friction material and metal in the filter or strainer indicating internal problems requiring rebuild. If clean, check for power in and out of all gear positions to the transmission solenoids including 4th gear.... If there is power there try swapping solenoids to see if the problem moves with it. Let me know

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Customer reply replied 1 year ago
Tried all that so far last time talking to you. It is a 24v system though what voltage should I get at solenoid plug?
Customer reply replied 1 year ago
No debris in filter housing and fluid looks good just quite a bit overfilled
Mechanic: Dan, Technician replied 1 year ago

I just tried looking at our old conversation and it has been deleted by the site.... Please refresh my memory of the tests you have done and the results... Are there any solenoids not getting power at the transmission in 4th? and if not and the shift controller tests good then what happens when swapping solenoids? will the problem move to another gear? If it remains the same the next step is to test your pressures and see what 4th gear is doing as if pressure drops off in that clutch it means the clutch pack has a problem and the transmission needs to be taken apart.

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Customer reply replied 1 year ago
Ok can you refresh my memory on how to test the power at solenoids from switch?
Customer reply replied 1 year ago
Let's just start from scratch but I told you it was 12v system when it's 24v
Mechanic: Dan, Technician replied 1 year ago

What voltage are you getting to the solenoids that are working and shifting properly?

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Mechanic: Dan, Technician replied 1 year ago

The schematic I have shows 12V for the transmission solenoids and it is a 24V system

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Mechanic: Dan, Technician replied 1 year ago

Click here.

Schematic

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Mechanic: Dan, Technician replied 1 year ago

This info will likely be helpful too for test purposes.

Testing

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Customer reply replied 1 year ago
Has 12.4 v and like flames back and fourth to o.2 ground reference at solenoids
Mechanic: Dan, Technician replied 1 year ago

What do you mean by flames back and forth? 12.4 V is what should be there to engage the solenoid... If you have that then try swapping solenoids with another gear. Also 4th gear solenoid should be powered in Neutral. If not check the harness and the shift controller for worn contacts...

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Customer reply replied 1 year ago
Sorry dang auto correct it has 4.57 volts with v meter now and stayed
Customer reply replied 1 year ago
Checking wiring now
Customer reply replied 1 year ago
Ok so I don't have full 12 volts going to forward and 4th solenoid. Has it for split second when first shift it but that's it.
Mechanic: Dan, Technician replied 1 year ago

Thanks for the update. But you have it in all other gears. this points to a faulty shift controller. Test for power right out of the shifter in 4th and if it does the same right at the shifter, the shifter is no good

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Customer reply replied 1 year ago
Ok was checking power right out of shifter and didn't have power but now has no gears and won't start all the sudden? Like neutral safety? How to check control switch?
Customer reply replied 1 year ago
Wiring diagram from switch would be awsome!
Mechanic: Dan, Technician replied 1 year ago

Hi, Thanks for the info... If you have power into the shifter and now nothing coming out in each gear position replace the faulty shifter. That means the shifter is bad. It is a common wear item.... If the contacts wear and now is not reading neutral position it will have the symptoms you are experiencing. Power in but not out in all gear positions means a bad shift controller.

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Customer reply replied 1 year ago
Have 2 wires with 12 volts going in to shifter and nothing out
Mechanic: Dan, Technician replied 1 year ago

You have a bad shifter my friend. Replace it and you will be all set.

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Customer reply replied 1 year ago
Ok replaced shifrer. Starts now but does not have second. Stays in 1st when shift selector to 2nd and still shows first on display. Still no 4th gear either.
Mechanic: Dan, Technician replied 1 year ago

You got forward and reverse 1? Swap solenoid 6 with solenoid 4 and let me know what you get for results

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Customer reply replied 1 year ago
forward and reverse 1st switch solenoids and same issue
Mechanic: Dan, Technician replied 1 year ago

If you have power to your solenoids and swapping the solenoids has no change it leads to internal mechanical problems in the transmission or control valve itself. Pressure testing the transmission and comparing the results to specs is your next step. This will tell us if you are losing pressure from a valve problem or a clutch leaking internally, etc.

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Mechanic: Dan, Technician replied 1 year ago

No metal or clutch material in the filter or suction screen? You mentioned the level is overfull or is it continuously overfilling from a hydraulic pump seal leaking into the transmission?

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Customer reply replied 1 year ago
No debris in transmission. If I hit forward solenoid and 4th gear solenoid with 12v it shifts into 4th and works?
Customer reply replied 1 year ago
Gotta be wiring or something right? I'm checking wiring and stuff right now but tried putting 12v just to see if it would work and it does. It doesn't have 12v at solenoid.
Mechanic: Dan, Technician replied 1 year ago

Take a close look at the harness between the shiftter and the transmission solenoids for any shorts , corrosion or damage and if ok also take a look at the transmission neutralizer circuit and switches/harness for damage or proper operation. Theis will put the transmission in neutral when the left brake is pressed or the button is pushed which I believe is usually on the bucket control lever. Let me know

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Customer reply replied 1 year ago
Wiring from transmission to duesh plug going through cab is good but from the two control switch plugs to the dueshe plug can't ohm out. Gives me weird readings? Is there something else that should be unhooked when testing wires indavidually?
Customer reply replied 1 year ago
Could it be the autoshift controler
Mechanic: Dan, Technician replied 1 year ago

It very well could be the controller. Ill try to dig through my files later to see if I have any schematics. Click on the link for the pressure tests.....

Pressure testing

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Mechanic: Dan, Technician replied 1 year ago

Click on this link.

Troubloeshooting

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Customer reply replied 1 year ago
Ok have ohmed all wiring from switch to auto shift module to solenoids and all is good.
Mechanic: Dan, Technician replied 1 year ago
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Mechanic: Dan, Technician replied 1 year ago
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Customer reply replied 1 year ago
Ok everything is good now shows right gears in display and all solenoids have right voltage expect in 4th. Neither forward or 4th gear solenoid have power when switched to 4th gear?
Mechanic: Dan, Technician replied 1 year ago

What changed to make that happen? Did you find wiring trouble?

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Customer reply replied 1 year ago
No disconnected everything and hooked back up. That's it.
Customer reply replied 1 year ago
Just disconnected everything and hooked back up.
Customer reply replied 1 year ago
Computer problems maybe or what could cause that gear only not to work?
Mechanic: Dan, Technician replied 1 year ago

Run a test harness from the shift control to the solenoids for 4th and if it works there is a problem in the harness wiring or connector pins

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Mechanic: Dan, Technician replied 1 year ago

click on this link

ECM pinouts

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Mechanic: Dan, Technician replied 1 year ago
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Mechanic: Dan, Technician replied 1 year ago

Some of the returns will be shared as shown in the diagram ( White 975)

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Customer reply replied 1 year ago
K will check it a little more tomorrow and let you know
Customer reply replied 1 year ago
Thank you very much
Mechanic: Dan, Technician replied 1 year ago

Pleasure to help.

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Customer reply replied 1 year ago
Ok have good ground from switch to ecm on 966 gray wire while in 4th. No power out to solenoid 4 on 754 blue wire. Or am I reading these pin outs wrong haha
Customer reply replied 1 year ago
The switch is what grounds the ecm to send power and it's not sending it so computers bad?
Mechanic: Dan, Technician replied 1 year ago

All forward gears use solenoid 2.... forward and 4th uses solenoid number 2 an 3 so check solenoid 3 on the diagram (The solenoid chart) solenoid 3 should have power and if it does in 4th then swap 3 with one of the others and check if the problem moves. 4th gear is the only gear that uses solenoid #3.

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Mechanic: Dan, Technician replied 1 year ago

I am heading out for a family gathering and will not be back until late tonight but check the solenoid location diagram and remember 2 is forward and 2 and 3 powered is forward and 4th

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Customer reply replied 1 year ago
I have checked that. When switched to 4th it doesn't have power at forward or 4th solenoid.
Mechanic: Dan, Technician replied 1 year ago

Interesting... Can you do something for me? In each gear position let me know what solenoids are actually getting power according to the chart and if 4th is the only one with any type of power loss to any of the solenoids or are there any others in the other gear positions?

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Customer reply replied 1 year ago
Everything is good all forward gears have #2 solenoid like you mentioned but as soon as I switch it to 4th gear solenoid #2 or #3 have power like suppose to.
Customer reply replied 1 year ago
Have no power*
Mechanic: Dan, Technician replied 1 year ago

Interesting. Do you have access to a laptop with CAT ET to read live data? Is the fault warning indicator going off when this happens?It looks like a faulty ECM I would try having your reflashed with the most current software version and the calibrations done with ET and see if the problem still exists.

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Customer reply replied 1 year ago
Does it need to be on unit when reflashed?
Mechanic: Dan, Technician replied 1 year ago

Depends on your dealer. the dealer i worked for had test bench harnesses

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Customer reply replied 1 year ago
K do you have a flash code description because it does have codes.?
Mechanic: Dan, Technician replied 1 year ago

What codes are you getting?

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Customer reply replied 1 year ago
I have a big list but not on me. None active though
Mechanic: Dan, Technician replied 1 year ago

could you post them when you get a chance?

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Customer reply replied 1 year ago
sir tomorrow morning
Mechanic: Dan, Technician replied 1 year ago

Sounds good

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Customer reply replied 1 year ago
Ok 4th gear still never worked. Now 2nd gear doesn't work but is intermittent. Sometimes it does. But while loading the bucket and driving it its like it looses power. Won't even scoop scoop loose dirt up hardly?
Mechanic: Dan, Technician replied 1 year ago

What were the results when monitoring with Cat ET as I suggested? How dis the re-flashing go of the ECU/ECM? I would have the module reflashed for a complete reset and update to new factory settings then see if the problem still exists.

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Customer reply replied 1 year ago
Haven't done that yet but will but low power problem won't be ecm will it? And can I just take ecm to dealer for reflashed or whole unit?
Mechanic: Dan, Technician replied 1 year ago

That will depend on your dealer if they have the test harness to do it on the bench. Some do. If not they will need to access the machine by Field service or bring it to them. Call ahead and maybe your dealer has the test harnesses on site. The dealer I worked for did. Pull the hydraulic filter and trans filter again and cut them open to inspect a sample. Squeeze the excess oil out in a vice. any fine metal/debris indicates a component failure occurring.

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Customer reply replied 1 year ago
Ok will do
Mechanic: Dan, Technician replied 1 year ago

Pleasure to help

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Mechanic: Dan, Technician replied 1 year ago

Keep me posted and remember to rate my answers once you have all the information you need as that is how the site credits the experts for their time on the site.

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Customer reply replied 1 year ago
Sure will. If fluid and filters look good what do I check next for low power? It won't drive if in a pot hole or won't even back drag anything. In first gear or any
Mechanic: Dan, Technician replied 1 year ago

Start with your engine fuel system checks for restrictions and leaks or low fuel pressure, etc., turbo and air system restrictions or problems and if the engine checks ok it is time to get some test gauges on the converter and transmission to run through the pressure tests.

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Customer reply replied 1 year ago
Engine is fine it's like fluid us bypassing somewhere. Weak pump or seals or bushings bad but no degrees in fluid
Mechanic: Dan, Technician replied 1 year ago

It is time to get test gauges on this and have the pressures checked and conformed to specs.

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Customer reply replied 1 year ago
Drained tranny again. This time it has like fine green pieces of seal or something in it. What should I be looking for exactly?
Mechanic: Dan, Technician replied 1 year ago

thanks for the update Cut open with a non abrasive cutting tool or filter cutter the filter and after cutting a decent size sample of the filter element, squeeze the excess oil out in a vice. then open up the sample to see what you find for metal, o ring/seal material, clutch/friction material, etc. This will flag an internal problem.

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Customer reply replied 1 year ago
Ok had some like red fuz in filter like a red rag coming apart or something. Supposedly transmission was just rebuilt about a year ago. Not any hunks of nothing really. Some fine metal flakes not very much though. And what type of fluid does transmission take. Thank you
Mechanic: Dan, Technician replied 1 year ago

Byi chance can you take a photo of the debris and metal? When these components fail it starts as fine metal flakes looking like glitter in the oil. These flakes get caught in the filter which helps tell us a story. aluminum ( Converter), steel/brass ( Pump Hyd system). Having your pressures checked will confirm an internal problem if the pressure is dropping off in 4th gear. Transmission and Drive Train Oil or equivalent. Most auto parts stores have their version of this. Make sure it meets the Cat Spec for wet brake systems.

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Customer reply replied 1 year ago
Says file is too large?
Mechanic: Dan, Technician replied 1 year ago

Did you take it from your cell?

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Customer reply replied 1 year ago
sir
Mechanic: Dan, Technician replied 1 year ago

Try uploading to mediafire.com or dropbox.com and share the link with me or I can send an additional service offer where I can offer my e mail to send it to

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Customer reply replied 1 year ago
http://www.mediafire.com/view/k5hz7b15dgz7dd9sysca5
Mechanic: Dan, Technician replied 1 year ago

i got an error message.

Invalid or Deleted File.

The key you provided for file access was invalid. This is usually caused because the file is no longer stored on MediaFire. This occurs when the file is removed by the originating user or MediaFire.

Still have questions, or think we've made a mistake? Please contact support for further assistance.

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Customer reply replied 1 year ago
303 hydraulic fluid right?
Mechanic: Dan, Technician replied 1 year ago

No.Cat TDTO SAE 30 is

factory

fill

for

standard

configuratio

n

Medium

Wheel

Loaders

(950-980)

and

Medium

Wheel

Dozer

(824)

Except

for

machines

that

are

equipped

with

a

hydraulic

drive

winch

gear

case.

Use

SAE

30

viscosity

grade

for

0°C

(

32°F

)

to

43°C

(

1

10°F

)

or

Cat

TDTO-TMS

for

−20°C

(

-4°F

)

to

50°C

(

122°F

)

.

When

you

are

operating

the

machine

in

temperatures

below

−20°C

(

−4°F

)

,

refer

to

Special

Publication

,

SEBU5898

,

Cold

Weather

Recommendatio

ns.

This

publication

is

available

from

your

Cat

dealer

.

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Mechanic: Dan, Technician replied 1 year ago

TO4 spec

Click here for the specs.... Match the specs or go with Cat OEM oil.

http://www.toromontcat.com/pdf/transmissionsynthetic.pdf

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Customer reply replied 1 year ago
Thank you. Where are all the filters at that I need to check?
Mechanic: Dan, Technician replied 1 year ago

The transmission filter will be under the step platform and the suction screen at the bottom of the case. Please remember to rate my answers.

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Mechanic: Dan, Technician replied 1 year ago

Let me know if you need more help

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Customer reply replied 1 year ago
Removed back cover off of transmission at bottom and can't find any bad looking debris. Everything looks pretty good except for that fine fine metal which I would call normal wear in a semi. Because wasn't much of it.
Customer reply replied 1 year ago
Suction screen where on bottom of case? And filter is the cartridge filter under cab?
Mechanic: Dan, Technician replied 1 year ago

Thanks for the update. Truck transmissions and wheel loader transmissions are two totally different animals. Your transmission has clutch packs and planetaries as well as a valve body, o ring seals, and functions off of hydraulic pressure the same as an automatic transmission. If your comparison is to debris found in an Allison automatic, it would be a more equal comparison but an Eaton or Mack transmission is mechanical and air and electric solenoid shifted for the autoshifts. Gearbox transmissions are more forgiving of debris and contamination.

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Mechanic: Dan, Technician replied 1 year ago

On the bottom of the Case look for a square cover with 4 bolts. The screen is inside there.

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Mechanic: Dan, Technician replied 1 year ago

Click this link. The next step is to test your pressures.

Pressure test

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Customer reply replied 1 year ago
Thank you very much. And yes sir I've found more debris changing filter on an Allison than this and worked fine still that's why I mentioned it. I appreciate your help. I'm gonna pull screen and check it
Mechanic: Dan, Technician replied 1 year ago

Pleasure to help. All it would take is a leaking seal in the 4th gear clutch pack for pressure to drop off and not apply those clutches. Testing the pressures will tell if you have a loss of pressure in 4th from internal leakage, etc.

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Customer reply replied 1 year ago
It don't drive in any gear when loading dirt it just looses it's power to drive. I got 4th gear working. The solenoid wasn't getting power.
Mechanic: Dan, Technician replied 1 year ago

Sounds like a pump/Converter problem. You need to test your pressures as the next step.

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Customer reply replied 1 year ago
On tap (E) for pump is suppose to be 310 psi at idle. Is that with axles in or out?
Mechanic: Dan, Technician replied 1 year ago

At all times engine running....

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Mechanic: Dan, Technician replied 1 year ago

the chart will tell you if you need to be in gear, at idle, or full RPM

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Mechanic: Dan, Technician replied 1 year ago

When you lose pressure the first to always go is lube which is everything left over and is non adjustable. There is no need to adjust anything and do not try or it will complicate the troubleshooting procedure. The machine worked with the existing shims, etc. There is another issue not related to the adjustments. And trying to shim or adjust to compensate for the actual problem is a waste of time and will just be a waste of time and make it tougher to test and analyze the test results. See that you have for lube, converter in and out, then clutches.... Let me know the results for each

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Customer reply replied 1 year ago
On tap (E) for oil pump it only has 75 psi at idle and don't go over 150 at high idle.
Customer reply replied 1 year ago
Pump bad or do I need to check converter still?
Mechanic: Dan, Technician replied 1 year ago

Bad pump. If you did not have aluminum, friction material, or metal in the filter or suction screen change the pump and then reconfirm your pressures and run through the tests. No reason to go further with low pump output.

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Customer reply replied 1 year ago
Pumps is on top side of transmission correct? Removal procedure by any chance. Thanks for all your help buddy much appreciated.
Customer reply replied 1 year ago
should I check anything else before I change that jewel?
Mechanic: Dan, Technician replied 1 year ago

Yes, Remove the covers under the cab to access the hydraulic pump. Drain the hydraulic system oil, Remove the hydraulic pump lines and mounting bolts and remove the pump. Unbolt the transmission charge pump and remove. Clean all sealing surfaces and reinstall both pumps with new o rings installed lubricated with grease.

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Customer reply replied 1 year ago
Ok so need both pumps or just transmission charge pump? And drain transmission oil and hydralic tank or just hydralic fluid tank? Thank you
Mechanic: Dan, Technician replied 1 year ago

Just the transmission pump unless you are losing hydraulic oil into the transmission and overfilling from a faulty hyd pump seal. If not the hydraulic pump just needs to be removed to get to the charge pump

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Mechanic: Dan, Technician replied 1 year ago

Be sure to get all new o rings to mount and seal it and for the lines. Both hydraulic and charge pump.

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Mechanic: Dan, Technician replied 1 year ago

Drain the hydraulic. The entire tank of oil will spill out if not as the pump is lower than the tank. The transmission Id service after a couple hours of running and then after do a filter change and cut open and inspect for signs of a problem. Monitor it a couple times for confirmation there are no more issues

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Customer reply replied 1 year ago
Any way you have a breakdown image of pump our parts guys can't find it hard much appreciated!
Mechanic: Dan, Technician replied 1 year ago

The charge pump? What parts are you looking for? Did you get a replacement pump?

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Customer reply replied 1 year ago
No sir not yet. And yes the charge pump for the transmission.
Mechanic: Dan, Technician replied 1 year ago

I do not have SIS to look up parts diagrams unfortunately. Your Cat Dealer cant find a transmission charge pump?

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Customer reply replied 1 year ago
They said it's not called that under their books? Haha
Mechanic: Dan, Technician replied 1 year ago

I worked for a Cat dealer years ago and the techs looked up their own parts.... This is part of the reason why... haha

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Customer reply replied 1 year ago
sir I understand that! Haha
Mechanic: Dan, Technician replied 1 year ago

Try them again and tell them to type in Transmission pump group under your serial number and it will pull up. i promise you. haha

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Mechanic: Dan, Technician replied 1 year ago
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Mechanic: Dan, Technician replied 1 year ago

You can buy them aftermarket for a lot less. The link I posted is likely the correct one for your serial number but you would have to confirm that with the seller.

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Customer reply replied 1 year ago
Man changed the charge pump and same issue. Are we skipping a step or something? Thanks for the help
Customer reply replied 1 year ago
Absolutely no debris to show internal failure. With pump pressure not building like it should what could cause that?
Customer reply replied 1 year ago
What's causing pressure to bypass or drop when in neutral not moving just idling I don't have any hair left too pull haha
Mechanic: Dan, Technician replied 1 year ago

What are all your pressures? If the pump is no picking up the oil, check the suction screen. sometimes a little grease helps but a new pump should be picking up the oil. You have no pressure at all?

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Customer reply replied 1 year ago
Same pressure as before 75 psi and no restrictions.. don't know other pressure. Started with pump pressure and was low. So changed pump like you recommended but maybe I skipped a step? Or something
Mechanic: Dan, Technician replied 1 year ago

The pump is a fixed displacement so it sounds like you have pressure dumping off either in the converter or in the transmission. This is odd that you only lost 4th gear but have very low pressures. Try testing your pressures in the other gears and let me know the results.... I will have a better idea being able to see the rest of the pressures.

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Customer reply replied 1 year ago
I have 4th gear. Just when I go to scoop a load it looses power like torque converter slipping have 75 psi at idle in neutral don't have to shift it to gear for it to drop.
Mechanic: Dan, Technician replied 1 year ago

Ahhhh gotchya.... It is common to replace both the pump and converter on a converter failure. Usually the filter and strainer will get stuffed full of aluminum when the converter fails.... But if you are not getting any pressure beyond the converter but the pump suction strainer/tube is not sucking air and it is not restricted, it is a converter problem.... Especially if you are still not getting full pressure to the transmission clutches.... Replace the cooler as well as it could be plugged and will cause an overheating problem

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Customer reply replied 1 year ago
Don't think is sacking air but that's the pressure straight out of the pimp on filter housing. Don't know converter pressure
Mechanic: Dan, Technician replied 1 year ago

Check at A and B, and C ports at the TC regulator, inlet and outlet pressure. and the others.... sounds like pressure id dumping off somewhere.

(A) Pressure tap for lubrication
(B) Pressure tap for converter outlet
(C) Pressure tap for converter inlet
(D) Pressure tap for speed clutches
(E) Pressure tap for the pump(F) Pressure tap for direction clutches

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Customer reply replied 1 year ago
Only have one gauge so can I check them one at a time?
Mechanic: Dan, Technician replied 1 year ago

Yes, That is perfectly fine.

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Customer reply replied 1 year ago
Converter inlet is only 50 psi at high idle
Customer reply replied 1 year ago
Converter outlet 47 psi
Customer reply replied 1 year ago
How would you check to see if sucking air?
Mechanic: Dan, Technician replied 1 year ago

Inspect the suction tube for leaks and the suction screen for restrictions. Make sure the o rings for the hoses are sealing. Inlet should be a lot higher. Either theres a restricted suction line, sucking air, or you have a defective pump out of the box.

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Customer reply replied 1 year ago
Checked suction screen again and keep getting Red fuzz from a red rag it looks like. Maybe they left it in there when they rebuilt transmission but can't find it and it's not enough fuzz to stop it up. Checked suction tube and seals and all seem good. Something on inside of transmission on other side of screen that could be wrong?
Mechanic: Dan, Technician replied 1 year ago

Maybe the rag is in the suction tube itself....

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Mechanic: Dan, Technician replied 1 year ago

Check to be sure the tube is totally clear.

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Customer reply replied 1 year ago
Tube is clear. The one that bolts to pump itself right?
Mechanic: Dan, Technician replied 1 year ago

That is correct. either the Pump is not picking up from a cracked or leaking suction tube, etc. or the pump is defective, or if the line and pump are good assuming the pressure is the same with both pumps you are dumping off pressure after the pump such as in the converter indicating a converter problem. Let me reach out to another expert to see if he has any thoughts as well.

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Customer reply replied 1 year ago
Awsome thanks man. About to pull tranny so sooner the better on suggestions. Thanks for all your help!
Mechanic: Dan, Technician replied 1 year ago

Pleasure to help. I am right with you on that that the transmission and converter have to come out for rebuild/repair.

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Customer reply replied 1 year ago
No cracked pickup or restriction to pump so what's the first thing fluid goes too dick you get another opinion?
Customer reply replied 1 year ago
Did* sorry
Customer reply replied 1 year ago
Don't wanna pull it for no reason because like you said there should be some aluminium in screen or something.
Mechanic: Dan, Technician replied 1 year ago

Hi, Yes and we both agree that the red material has to be a red rag that went through the transmission at some point and likely is just shredded into the pieces you are finding. Also, your last step before pulling the transmission is to pull the valve body and disassemble and inspect all the valves and spools, polish with crocus cloth and be sure of free movement in the bores, reseal and reassemble, Recheck pressures and operation.

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Customer reply replied 1 year ago
Pull valve body on top of transmission? One with solenoids in it?
Mechanic: Dan, Technician replied 1 year ago

Yes

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Customer reply replied 1 year ago
What is solenoid body and valve body sealed with
Mechanic: Dan, Technician replied 1 year ago

Gaskets and o rings. Your cat dealer can print you out a diagram from the parts department

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Mechanic: Dan, Technician replied 1 year ago

Please take a few moments to rate my service as that is how the experts get credit for their time on the site. Thank you

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Customer reply replied 1 year ago
There is no type of gaskets or silicone in between valve body plates but silicone between solenoid body and valve body.
Customer reply replied 1 year ago
Don't see no debris in valve
body though.
Mechanic: Dan, Technician replied 1 year ago

It should not be silicone.... O rings seal the solenoids. Obtain a parts breakdown with part numbers from your dealer and go by that. That way there is no room for error. If the valve body checks out then unfortunately you will be removing the transmission for rebuild. Please take the time to rate my service as I have taken the time to help. Its been a pleasure helping.

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Customer reply replied 1 year ago
No not on solenoid in between the valve body plates. But I will chwck with them but any way to check anything else to make sure of what's bad because no debris in tranny besides the red fuzz in filter and tranny just rebuild it seems odd but of course I will your getting 5 star haha
Mechanic: Dan, Technician replied 1 year ago

Someone used silicone there? I believe there is a gasket that is supposed to be there. If the valve body was installed with only silicone between the valve body and transmission, this is likely a big part if not all of your problem.... Make sure all the o rings are changed as well

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Mechanic: Dan, Technician replied 1 year ago

silicone wont hold up to the transmission pressures

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Mechanic: Dan, Technician replied 1 year ago

Use it on the top cover maybe... haha

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Mechanic: Dan, Technician replied 1 year ago

Also check for straightness with a straight edge and make sure no one used a cookie wheel on the machines surfaces causing them not to mesh and seal

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Customer reply replied 1 year ago
Sorry haven't rated yet because knew would need further help. Any removal procedure of torque converter and disassembly of transmission. Have it out and valve body off and where do I look for seals blown in the clutch packs. Can't get cat to send good breakdown.
Mechanic: Dan, Technician replied 1 year ago

Hi, Unfortunately Cat breakdowns aren't the greatest with the cut open side views but that unfortunately is how a lot of them are. If you are doing a rebuild on the transmission and converter I would not go in too far without a copy of the shop manual on hand as there are specs and tolerances to follow and one missed step could cost the whole job and a redo. I do not have the complete service book for your serial number for the disassembly and assembly. A lot of times you can fond good used manuals on the web on E bay, etc. I would by all the seals and o rings and at the very least, Re-bearing and reseal everything and inspect the clutches per specs in the manual.

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Mechanic: Dan, Technician replied 1 year ago

The initial links I posed have the troubleshooting information. Here is some info directly from the links I posted. Let me know the results of these tests. I believe you might be skipping around on the tests and you will never be able to isolate the problem that way and will just get frustrated. I see you opened a new question and are getting the same information we already went over.

Problem: The transmission does not operate in FOURTH SPEED FORWARD position or in FOURTH SPEED REVERSE position.
Probable causes:


  1. Number 3 FOURTH SPEED solenoid valve (2) is inoperative.

  1. There is a problem in the electrical circuit.

  1. The FOURTH SPEED clutch is not engaged or the FOURTH SPEED clutch slips. This may be caused by any of the following conditions:

    1. There is low oil pressure due to leaking piston seals.

    1. The clutch discs and clutch plates have too much wear.

    1. Clutch components are broken.

  1. Selector spool (18) is stuck.
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Customer reply replied 1 year ago
Selector spool 18 is located where? All solenoid body and piston seals are good what else could cause it? It don't have power to move any dirt in any gear. Just acts like slipping and have tried everything you recommended with no luck.
Mechanic: Dan, Technician replied 1 year ago

Thanks for the update. Its the 2nd and forth selector spool in the control valve. Click on this link for the diagram.

Diagram

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Customer reply replied 1 year ago
Took valve body completely apart and had no excessive wear or broke springs. What else do I check for?
Customer reply replied 1 year ago
Could it be the flow control office (10)? Noticed it there
Mechanic: Dan, Technician replied 1 year ago

You can check it for a restriction but i do not believe it will cause the problems you are having. I am going to opt out and a fresh set of eyes to come in and help you with this. We have been on this for several months and one question prior to this one. Maybe someone new might have other suggestions.

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Customer reply replied 1 year ago
K so how will that work? They'll see what we've already went through and opt in?
Customer reply replied 1 year ago
Where's flow control office located exactly?
Customer reply replied 1 year ago
Transmission neutralizer limit switch location?
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Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
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