Construction and Road Equipment

Construction and road equipment repair questions? Ask a mechanic ASAP

Connect one-on-one with {0} who will answer your question

This answer was rated:

After replacing seal on the front of the transmission sump…

After replacing seal on the...
After replacing seal on the front of the transmission sump I put all new oil in the sump and changed out the oil in the filters. After putting it all back together I started it up and have the hydraulics working great but the machine won't move. This is on a 4810. It was working perfect before I took it apart to change the seal. Please tell me what could be wrong.
Show More
Show Less
Ask Your Own Construction and Road Equipment Question
Answered in 20 minutes by:
5/8/2016
Mechanic: Bradley Martin,
 replied 6 years ago
Bradley Martin
Category: Construction and Road Equipment
Satisfied Customers: 497
Experience: Field Technician at Thompson Tractor Company
Verified
What are you calling the transmission sump?
Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 years ago
The transmission Is incased in a sump that holds 28 gallons of oil. The seal I replaced was on the front of the sump around the center shaft of the transmission.The transmission is then.connected to the engine with a drive shaft.
Mechanic: Bradley Martin,
 replied 6 years ago
Did you have to take the linkages loose from the transmission
Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 years ago
I never disconnected any linkage as there was no need to. And why does it cost an additional 35$ to talk in person
Mechanic: Bradley Martin,
 replied 6 years ago
Ok I will opt out and see if anyone else has an idea dont have to much experience with the 4810
Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 years ago
OK hope someone else can help.
Customer reply replied 6 years ago
Well I give up you guys have been no help and I better not be charged for no help. Thank you very much.
Mechanic: Dan, Technician replied 6 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,102
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified
Hi Darrel, My name is***** would like to try to help you with this if you still need help. Let me know as I believe I have the manual for this model as well.
Ask Your Own Construction and Road Equipment Question
Mechanic: Dan, Technician replied 6 years ago
Click on this link to access the part manual with the hydraulic and electrical schematics for your circuits. Go to PDF file page 60 for the schematics. Check all your safety interlock switches and harness to verify if it is a interlock switch/harness problem locking out travel and if that checks ok we need to see if the hydrostatic drive pumps are putting out pressure to the drive motors and that you have good pilot pressure for the controls. Here is the link. Let me know.ManualPOWER & SPEED CONTROLThe POSI-TRACK transmits the power fromthe engine to the tracks using a hydrostatictransmission. The hydrostatic transmissionsends oil under pressure to two individual hy-draulic motors, one for each track. The hydro-static transmission consists of two individualhydrostatic pumps. One pump for each motor.Track speed is increased by sending more oil tothe hydraulic motors, and power is increased bysending less oil to the hydraulic motors. With amechanical transmission the operator must shiftdown to increase power. With hydrostatic drivethe operator can simply pull back on the drivecontrols, reducing speed and increasing powerat the same time.HYDRAULIC RELIEF PRESSUREThere are three main forces involved in trans-mitting power from the engine to the ground:ENGINE POWER, HYDRAULIC RELIEFPRESSURE, & TRACTION. Engine powerand traction can be easily understood, howeverrelief pressure must be explained in greater de-tail. All hydrostatic pumps have a “reliefvalve”. A relief valve makes the oil by-pass thehydraulic motor to prevent the pump from pro-ducing too much pressure. Every pump has it’spressure limitations. The lower the pressure,the longer the pump, as well as other drive com-ponents, will last. The relief valves protect thevehicle from a damaging situation. For exam-ple: The relief valves minimize track damageand track derailment.The hydrostatic pumps of the POSI-TRACK 4810 have relief valve settings of4,000 lbs. psi. This means each drive pumpcan produce a maximum of 4,000 poundsper square inch of pressure. The harder thepumps are worked, the more pressure theywill produced until they reach their reliefvalve setting.For example: It takes a certain amount offorce to push a large rock across hardground. If it takes 6,000 psi of oil pressureto push this rock straight forward, eachdrive pump produces 3,000 psi for a total of6,000 psi. Under good traction the vehiclewill push this rock straight forward sincethe pumps have not reached their individual4,000 psi relief valve setting. If the opera-tor tries to turn the vehicle while pushingthe same rock, the load on the inside trackwill be less, and it’s pressure will decrease.The load on the outside track will be in-creased, thus increasing it’s pressure. If theoutside track is getting good traction, the4,000 psi relief valve setting can bereached, making the track stop until theload is reduced. The oil for both trackscould be made to go over the relief valvesif the same rock was pushed up hill since itwould take much greater force.CHECKING CHARGE PRESSUREThe charge pressure refers to the oil that is sup-plied to the main drive pumps, this oil allows thepumps to shift. If the charge pressure is low, thedrive pumps may not shift at all when the leversare stroked or they may shift sluggishly, resultingin erratic track behavior.1. Open the filter access panel on the side of thevehicle. Locate the test port in the upper righthand corner (A). (Pressure tap on top of the last filter housing to the right)2. Remove the cap and screw on a pressuregauge.3. Start the engine and let idle. At an idle, thecharge pressure should be between 280 to 320 psiwhen the oil is warm.Vehicle starts but tracks won’t go1. Operator not seated in seat 1. Sit down & fastenseat belt.2. Defective seat switch 2. Refer to electricaltrouble shooting guide3. Defective solenoid 3. Refer to electricaltrouble shooting guide4. Low charge pressure 4. Use the procedure I posted priorTracks respond sluggishly1. Hydraulic oil is still cold 1. Let oil warm up for a few minutes2. Low charge pressure 2. Refer to page 433. Low hydraulic oil 3. Add hydraulic oil4. Hydraulic filters plugged 4. Change filtersOne track won’t go1. Brake is engaged 1. Turn brake switch off, or rotatetrack in both directions to take bind off brakeram2. Cable is disconnected on 2. Reconnect cablelever3. Cable is disconnected on 3. Contact dealerpumpTrack will only go in one direction1. Loosen or disconnected drive tube or fitting 1. Contact dealer2. Broken drive tube inside 2. Contact dealerhydraulic reservoir3. Cable linkage in tank 3. Contact dealeris brokenI believe this is the information you were looking for Darrell. Let me know the results of your tests and if we need to dig deeper into this. We can post back and forth as needed. I help on here part time in between jobs and eves.I am on EST. Post your follow ups and I will respond at my next available log in.
Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 years ago
I think it might have something to do with the brake. The brake piston is extended up against the sprocket and when I use the switch to disingauge it it blows the fuse. I tried loosening the hydraulic lines on the brake ram and collapsing the ram manually by forcing oil out of it but that didn't work. I have even tried lifting the tracks of the ground but all I see is a slight huge of the track from forward to reverse sometimes.
Mechanic: Dan, Technician replied 6 years ago
thanks for the update. Your short is likely the solenoid for the brake valve but also could be in the harness. Disconnect the valve solenoid and see if the fuse still blows. Install a same amp breaker to save on fuses while testing. the electrical schematic is on PDF page 62 in the parts manual I posted for that circuit. The hydraulic schematic is in the manual too on PDF page 58. The brake cylinder is spring applied and pressure released so you would need to tee in with a portapower to release the brake to move the machine or tow it as long as the brake seals are not leaking the brake should release. check the solenoid and harness for shorts. Your brake is not releasing. Let me know
Ask Your Own Construction and Road Equipment Question
Mechanic: Dan, Technician replied 6 years ago
Hi Darrell, Just following up with you. Did you get this resolved?
Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 years ago
Didn't have a chance to work on it today. So when the brake is in gauged does that stop both right and left transmissions from operating?
Mechanic: Dan, Technician replied 6 years ago
Yes it does. It is also applied by spring pressure inside that cylinder. Verify there is pressure to release the spring pressure. If so and the cylinder will not release, check for bad seals in the cylinder. Try manually releasing it by adapting a porta power pump to it.
Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 years ago
OK. I got the brake working properly. Then I picked up a pressure tester and tested the charge pressure, all good the charge pressure is at 310-320 psi. How and where do I check the transmission pressures without disconnecting lines to the drive moters? Any positive input to make this thing move would be much appreciated.
Customer reply replied 6 years ago
Rember my lift and tilr hydraulics work perfect
Customer reply replied 6 years ago
Parts and service manual page 25, part 33, could this be my problem and if so could it be causing my problem? Do you know where it is located? Also page 23 , parts 39 and 40 this I know is located in the sump resivoir,could it be my problem?Also page 21 part #10, could this be my area of problem? It is located in the sump and has a red knurled button on it, what is that button for as it my have been bumped when I was doing my repair.
Mechanic: Dan, Technician replied 6 years ago
See PDF page 20 Neutral lock and charge relief. Check to see if that valve is restricting your travel pressureAlso see on the schematics. Check the filters in the transmission circuit for fine metal/debris that would indicate a pump or drive motor problem. If clean, check the directional control valve, neutral solenoid for power and operation/debris or damaged o rings, etc. I have to be on the road the rest of the afternoon but I will be able to follow up more this evening.
Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 years ago
Got it. Apparently when I was removing the hub tochange the seal on the back of the transmission I must have pride against the electrical adapter that goes into the oil sump and broke it but it wasn't visibly broken. I only found it when I tried to wiggle and it fell apart. Actually fixed it with electrical tape and a hose clamp. All works well now. Thank you for your knowledge and time.
Mechanic: Dan, Technician replied 6 years ago
Thanks for the update Darrell. Glad you got it resolved and it has been a pleasure working with you on this. Please take a moment and rate my service as that is how the site credits the experts for their time helping on the site.
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,102
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified
Dan and 87 other Construction and Road Equipment Specialists are ready to help you
Ask your own question now
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 Dan Your Own Question
Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,102
15,102 Satisfied Customers
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.

Dan is online now

Related Construction and Road Equipment Questions
My asv rt30 will run fine then when I turn or put a load on
My asv rt30 will run fine then when I turn or put a load on it it kills it then it will run rough with no power then it may start running perfect for a while … read more
Dan
Dan
Technician
Auto Mechanics 1&2/diesel mech
15,102 satisfied customers
I am Zoltán from Hungary and I would like to ask for your
Dear *****! I am Zoltán from Hungary and I would like to ask for your help. We are repairing a Bobcat 873 machine, replacing the left hydraulic motor bearing and oil seal. Once we put it together, eve… read more
Curtis B.
Curtis B.
Technician
Associate Degree
2,324 satisfied customers
I just bought a 1997 sk220lc pins are all good seems in
I just bought a 1997 sk220lc pins are all good seems in pretty good shape. 8000 hrs on it and still does well. But I find when I'm streched all the way out and go to come back in it's really slow and … read more
Heavy Equipment Tech
Heavy Equipment Tech
Heavy equipment mechanic
159 satisfied customers
I have a komatsu d37-px dozer. It stop moving forward or
I have a komatsu d37-px dozer. It stop moving forward or reverse. The suction screen was stopped completely up. I suspect the charge pump may be bad. Can u tell me where the charge pump is located?… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
1,298 satisfied customers
I have a Clark 45C Michigan Wheel Loader that is having some
I have a Clark 45C Michigan Wheel Loader that is having some transmission issue. The serial number is ***** When using the loader yesterday and today, when it gets hot it won't move forward, but rever… read more
Curtis B.
Curtis B.
Technician
Associate Degree
2,324 satisfied customers
I'm looking for some help in diagnosing a hydraulic issue on
I'm looking for some help in diagnosing a hydraulic issue on a 524d gradall telehandler. I purchased this machine torn apart and as a project to put it back together. The original owner had removed th… read more
Dan
Dan
Technician
Auto Mechanics 1&2/diesel mech
15,102 satisfied customers
Cat th407 telehandler foaming hydraulic oil caused by
cat th407 telehandler foaming hydraulic oil caused by transmission scavange pump sucking air dont understand how the charge pump delivers 19cc per rev and the scavange sucks 26cc per rev … read more
Dan
Dan
Technician
Auto Mechanics 1&2/diesel mech
15,102 satisfied customers
I put a new wheel seal in my new Holland L785 skid loader
I put a new wheel seal in my new Holland L785 skid loader and change fluid and now it will not move and the bucket will not move is there a way to bleed air pockets out of the hydraulic system … read more
Curtis B.
Curtis B.
Technician
Associate Degree
2,324 satisfied customers
I have a cat 247b. Not sure exactly if it's a pump or not
I have a cat 247b. Not sure exactly if it's a pump or not but when you raise the cab it's the first thing sticking out of the drive train. It has 2 bolts and it comes off. It also has a 1.5 inch hose … read more
Dan
Dan
Technician
Auto Mechanics 1&2/diesel mech
15,102 satisfied customers
I have a Terex 72 31 front end loader. Two problems. It has
I have a Terex 72 31 front end loader. Two problems. It has trouble turning and has problem getting going, forward and back. Could it be a hydraulic pump?… read more
Curtis B.
Curtis B.
Technician
Associate Degree
2,324 satisfied customers
You can help me I have a bobcat s185 turbo and the light of
you can help me I have a bobcat s185 turbo and the light of the hydraulic system on the dash is coming on and the bobcat stops working right away how I can fix this problem ? … read more
Curtis B.
Curtis B.
Technician
Associate Degree
2,324 satisfied customers
I have a 1971 model 400 deere backhoe that i just got back
Hello, I have a 1971 model 400 john deere backhoe that i just got back from a local shop having the clutch replaced- so the machine had to be split. I used the machine for about 2 hrs the clutch worke… read more
Dan
Dan
Technician
Auto Mechanics 1&2/diesel mech
15,102 satisfied customers
I have a ford 445 backhoe that is stuck in reverse. The
I have a ford 445 backhoe that is stuck in reverse. The shuttle shift spool was stuck. I took it apart and cleaned it up, now it works nice and smooth. But, it still won't go forward.… read more
Curtis B.
Curtis B.
Technician
Associate Degree
2,324 satisfied customers
I saw you answered questions Clark Loader 55c. I bought
I saw you answered questions for a Clark Loader 55c. I bought a same machine. On the loader arm is written 55b, but tag says 55 CA. It has a 6 cylinder cummins diesel which I think is V378. I bought i… read more
Curtis B.
Curtis B.
Technician
Associate Degree
2,324 satisfied customers
Hi I have a komatsu d475-2 bulldozer. It has hydraulic oil
Hi I have a komatsu d475-2 bulldozer. It has hydraulic oil getting into the transmission. It only seems to go through then the motor is running. Will pump basically all of What you put in the hydrauli… read more
Fieldtech59
Fieldtech59
418 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
Field service technician
Vocational, Technical or Trade Scho
1,325 satisfied customers
I am working on a Shantui SD16 and the transmission is overfilling
I am working on a Shantui SD16 and the transmission is overfilling in minutes of running the unit, while drain the hydraulic tank. I have fixed a shaft seal leak on the steerin pump but can't find any… read more
Dan
Dan
Technician
Auto Mechanics 1&2/diesel mech
15,102 satisfied customers
I have KOMATSU WA320, I have a problem with the Transmission
I have KOMATSU WA320, I have a problem with the Transmission , its Seems that the Hydraulic is mixing with Air !! can you help ?… read more
Dan
Dan
Technician
Auto Mechanics 1&2/diesel mech
15,102 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.

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

2,324 satisfied customers

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

Wayne

Wayne

Journeyman

1,298 satisfied customers

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

Cat Man

Cat Man

Cat Engine Expert

578 satisfied customers

I am ASE Master Certified.

dieseldan55

dieseldan55

Mechanic

299 satisfied customers

Road Mechanic for Volvo Construction Equipment.

Chris (aka- Moose)

Chris (aka- Moose)

Technician

85 satisfied customers

24 years of experience diagnosing & repairing

Steve

Steve

Mechanic

42 satisfied customers

Heavy Equipment Mechanic for 25 years

JBFixxer

JBFixxer

Mechanic

22 satisfied customers

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

< Previous | Next >

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