Construction and Road Equipment

Construction and road equipment repair questions? Ask a mechanic ASAP

Ask an Expert,
Get an Answer ASAP!

I have a 420 D that will only go forward when put into 3rd…

Customer Question
I have a 420...

I have a 420 D that will only go forward when put into 3rd gear it you put it into any other forward gear it will not move. when it is putt into revers it shakes the machine and the drive train locks up and will not even roll

Mechanic's Assistant: What is the complete model and serial number of your machine?

*CAT0420DJMBH00215*

Mechanic's Assistant: Anything else you want the construction mechanic to know before I connect you?

The machine was used by the military previously so it has a 12v/24v electrical system.

Submitted: 7 months ago.Category: Construction and Road Equipment
Show More
Show Less
Ask Your Own Construction and Road Equipment Question
Answered in 6 hours by:
12/7/2017
Mechanic: catmastertech, Technician replied 7 months ago
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 2,554
Experience: Field service technician for CAT 19 years.
Verified

Hello,

I am sorry no one could help you earlier. I will be glad to help if you still need assistance.

Have you drained the oil, pulled the screen and cut open the old filter to inspect for damage, metal or other contamination issues?

What oil are you using in the transmission?

Is the diagnostic indicator on? Is it showing a flash code? (possible flash sequence 11 to 79)

How many hours are on this machine?

Ask Your Own Construction and Road Equipment Question
Customer reply replied 7 months ago
No worries. I'll check when I get to work tomorrow
Mechanic: catmastertech, Technician replied 7 months ago

Ok, thanks. I will be available tomorrow night and I will look for your reply.

Ask Your Own Construction and Road Equipment Question
Mechanic: catmastertech, Technician replied 7 months ago

Have you done any troubleshooting on this issue yet?

If so, what have you found?

Ask Your Own Construction and Road Equipment Question
Customer reply replied 7 months ago
Just checked fluids. Looked for any apparent damage to any wires
Mechanic: catmastertech, Technician replied 7 months ago

You should at least pull the transmission filter off and cut it open to thoroughly inspect the media for debris. If you find it is heavily contaminated, the transmission has failed and will need rebuilding/replacing. If you find some debris but are not sure it is the issue, it is still a good idea to drain the oil and inspect it for metal/debris or other contamination. An oil sample analysis could be helpful too. Once it is drained, pull the strainer and inspect it. The strainer will show the most details of the failures inside the transmission if you have any issue.

NEVER use any type of ATF fluid in this transmission. Only use the CAT TDTO grade or equivalent 30W.

Do your service manuals show how to retrieve the fault codes from the diagnostic light for the transmission?

Some machines have this indicator inside the right step storage compartment. Did you see the indicator light?

Do you have the CAT ET service program? Have you used it before to view fault codes on this machine?

Ask Your Own Construction and Road Equipment Question
Customer reply replied 7 months ago
We just received this machine. Has less than 300 hours on it. It has just been sitting in a military storage yard. I will check the filter today and see what I find. You say never use atf and to use 30w. What does atf do to it?? What would be the proper 30w. The closest cat dealer is 5 hours away. Something we could refill it with from a local parts store?
Mechanic: catmastertech, Technician replied 7 months ago

Napa has a TDTO 30W oil that matches the CAT oil well. ATF will slip and not cool the clutches. It can even cause them to fail.

Verify the oil level is correct when running and not when the engine is off. It can vary widely from off to engine running reading. Since this is a powershift transmission, I am not certain how much it can change but, read the instruction on the stick to verify the correct way to check the level.

Do you have any manuals for this machine? What about CAT ET? A special version was to be available for all branches of service.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 7 months ago
Thank you I will check the filter then change the oil just to eliminate that from the equation. No I do not have CAT ET or the manual for the machine
Mechanic: catmastertech, Technician replied 7 months ago

The dealer should have someone available to help with your Training group and get you setup with ET program. Of course, charges will apply but, it is something you should have with any of the newer CAT machines. Most dealers have done work with military machines so you can reach out to them for help too. Ask for their technical support group to get help with troubleshooting.

The bases I have been to recently had so very weak training manuals for these machines so, I do understand you not being familiar with these. Civilian versions have an Operators book in the back of the seat or in the storage compartment. It may even have a parts book on CD you can download to a PC. A CAT service manual will be expensive but, if you can get one ordered it is well worth having.

Look in the right step storage box, you may find a diagnostic red LED lamp and that is to view faults with the power shift transmission. If you do not have this, you will need CAT ET to view the codes. Normally, a fault indicator will be ON somewhere on the gauge cluster when you have an ECM fault. The ECM is under the floor of the cab. You will need to remove the flow mat to access the cover plate and it is attached to the bottom of the plate.

Only having 3rd forward is strange so I am concerned the transmission is damaged. I look through the manuals I have an could find this issue related to anything like a "Limp home" feature.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 7 months ago
I will look into the manuals and et. As well as look for the indicator in the battery box. There are no lights on the dad on that shouldn't be on. When you shift it into reverse it shakes the tires back and forth like it's going into reverse but still stuck in third. It literally locked up the drive train and will now even let the machine roll down a hill
Mechanic: catmastertech, Technician replied 7 months ago

That sounds like you have a mechanical failure inside the transmission. If nothing is on the filter or screen, this was a sudden impact failure.

If you find lots of debris, then it was more of a wear issue as it was grinding against something internally.

A sudden impact failure could be from shift reverse to forward at high speed or driving into a solid object at high speed.

Back in my day, if we found the machine was abused, the operating group had to pay for the repairs from their budget.

Please let me know if I can help you further.

CATMASTERTECH

Ask Your Own Construction and Road Equipment Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask catmastertech Your Own Question
catmastertech
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 2,554
2,554 Satisfied Customers
Experience: Field service technician for CAT 19 years.

catmastertech is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Technician

1,409 satisfied customers

Technican turned service manager with multiple lines of equipment and rental units.

Wayne

Wayne

Journeyman

650 satisfied customers

worked on many road graders, Bull dozers , skid steers, Rollers

Cat Man

Cat Man

Cat Engine Expert

517 satisfied customers

I am ASE Master Certified.

dieseldan55

dieseldan55

Mechanic

273 satisfied customers

Road Mechanic for Volvo Construction Equipment.

Chris (aka- Moose)

Chris (aka- Moose)

Technician

42 satisfied customers

16 years of experience

Steve

Steve

Mechanic

42 satisfied customers

Heavy Equipment Mechanic for 25 years

JBFixxer

JBFixxer

Mechanic

20 satisfied customers

16+ years experience, hydraulics,hydrostatics, engines, fuel injection systems. And everything in between.

< Previous | Next >

Related Construction and Road Equipment Questions
My wheel loader has 4WG200 ZF transmission. Will not move
My wheel loader has 4WG200 ZF transmission. Will not move forward or reverse. Oil clean/no debris screen/filter. Problem is electrical. Shifter is sending correct signals to ECU. I disconnected wiring… read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
11 satisfied customers
I have a D6T serial number LAY1592 around 6500 hrs. D6T XL,
I have a D6T serial number LAY1592 around 6500 hrs … read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
2,554 satisfied customers
I am having an issue with my case back-. It is a 580 Super L
I am having an issue with my case back-hoe. It is a 580 Super L PIN: JJG0192663 The issue i am having is that the machine will all of a sudden stop while driving and when put in neutral i will put it … read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,409 satisfied customers
Ihave an IT28 8CR00835 Lost all implements and steering and
This is for Catmastertec Ihave an IT28 8CR00835 Lost all implements and steering and has no forward or reverse is it safe to say trans pump or the drive gear on the converter or gear that drives pumps… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
2,554 satisfied customers
I have a caterpillar d250E articulate truck serial#
I have a caterpillar d250E articulate truck serial# ***** I am currently having trouble with the parking brake and secondary steering. The parking brake works for about 2 seconds then it will release … read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
11 satisfied customers
I am working on a 544D loader and just recently had tranny
I am working on a 544D loader and just recently had tranny out and found free wheel clutch is out. after replacing free wheel clutch in tranny and reassembled it returned with sypmtoms I had before wh… read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
11 satisfied customers
I have 310 sg deere backhoe with a noise on the transmission
I have 310 sg john deere backhoe with a noise on the transmission and it will only move on fourth gear … read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,409 satisfied customers
1979 580k. I was trying to load a pile of dirt when all of a
1979 580k. I was trying to load a pile of dirt when all of a sudden the machine shuddered and lost forward power l backed up and as I did I heard a felt an intermittent whack sound. It is in all gears… read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
11 satisfied customers
Man I have a question on a 928g loader I have been doing
Man I have a question on a 928g loader I have been doing some test on the transmission I need a little bit of direction. Here are some of the test results on pressures at the test ports cold Port G is… read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
11 satisfied customers
I am working on A Cat D250E Articulated truck PIN#5TN01600
I am working on A Cat D250E Articulated truck PIN#5TN01600 Transmission # ***** . I am having problems with the automatic transmission. When i put it in drive it will only stay in low gear no matter w… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
2,554 satisfied customers
I have a Furukawa FL140 I loader and it wont go forward, in
I have a Furukawa FL140 I loader and it wont go forward, in any gear. Reverse goes OK in all gears but… read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
11 satisfied customers
Steve..I have a D4H Series II 92' or so, powershift dozer t
Hello Steve.. I have a D4H Series II 92' or so, powershift dozer that initially would only go in reverse (1,2,3 speeds) and wouldn't go in forward (any speeds).… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
2,554 satisfied customers
I have a Case 580 LE TLB. The transmission was overhauled
I have a Case 580 LE TLB. The transmission was overhauled by CASE, Cape Town, SA but still the machine does not move. Lifting the wheels and selecting reverse the wheels roll but no forward movement. … read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,409 satisfied customers
I have a jcb 3 cx 1986 it will drive backwards ok but when
I have a jcb 3 cx 1986 it will drive backwards ok but when you go forward the buzzer sounds and it won't move… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,409 satisfied customers
Cat 416d standard transmission wont move cold. No oil pressure
Cat 416d standard transmission won't move cold. No oil pressure at test port by trans oil filter. Once trans is about 60 degrees F. machine moves forward and reverse. Pressure is 185 psi at 2000 rpm t… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
2,554 satisfied customers
I have a IT28G serial number 8CR01490 the transmission when
I have a IT28G serial number 8CR01490 the transmission when shifting to reverse acts like it is going into a forward and reverse gear We have replaced the shifter and the computer on the tranny as wel… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
2,554 satisfied customers
I have a D6M LGP and when you shift the machine into first
I have a D6M LGP and when you shift the machine into first gear forward or reverse it seems like it does not want to move.. as if the clutches are not locking up until you throttle it half way. When y… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
2,554 satisfied customers
L25B Ser # XXXXX came into my shop as a bank repo,
L25B Ser # XXXXX came into my shop as a bank repo, missing the fuse panel cover exposing it to weather, we replaced the fuse panel with new one{thousand dollars} and now have all electricl function as… read more
dieseldan55
dieseldan55
Mechanic
Vocational, Technical or Trade Scho
273 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x