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Dan, Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 4859
Experience:  17+ yrs. shop and field experience with all major brands of heavy equipment, trucks and farm equipment - 1995 WyoTech graduate.
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Old manuals make tracking down difficult -equipment

Customer Question

Old manuals make tracking down difficult for non-equipment mechanics. Our understanding is that the blade raising / lowering is off an accessory pump. All other functions come off of the main unit. If changing out the filters I listed doesn't correct issue I would like next steps to troubleshoot and repair issue.
Submitted: 11 months ago.
Category: Agriculture and Farm Equipment
Expert:  Dan replied 11 months ago.

Hi Coleen, My name is***** will be glad to try to help. What is your machine serial number?

Customer: replied 11 months ago.
Not sure where the 1st part of question went...
We have an older Komatsu Dozer D155A-1 SN#23187. Last year when hydraulic oil became low, first noticeable system was ripper would not raise. This year after startup, all fluids full: ripper will not raise, blade will not tilt, and tracts will not move - Blade will raise and lower. We would like troubleshooting info on what issue might be. Ordered filters for hydraulic tank, steering filter, transmission filter; tracking down torque converter filter.
Expert:  Dan replied 11 months ago.

Thanks for the update. It sounds like you likely have a pump failure on your hands. You will want to inspect your filters internally for fine metal/debris that looks like metallic glitter in the oil and filters which indicates a pump or component failure. If found the system needs to be flushed completely before running the replacement component to prevent cross contamination. Look for a plugged or restricted suction screen and also check the relief valve cartridges in the main control valve for damaged o rings and debris.

Expert:  Dan replied 11 months ago.

Click on this link to access the tank diagram and full parts manual to help with the component locations and part numbers. Let me know

Parts Manual