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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 1598
Experience:  Owner at DJ Wilson
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Have a D61PX15, new reman hyd pump. Bounces on lifting and

Customer Question

Have a D61PX15, new reman hyd pump. Bounces on lifting and when pushing down. angle, tilt, and steering are fine. Pump was replaced due to low pressure and a major tick attributed to a sticking spool in the rotating element. Those problems are solved. Checked the compensating spool in the control valve for the lift circuit, found it sticking, polished the spool and it slides fine but still has major bouncing (+1/4") on a half second frequency while lifting, therefore making it useless for fine grading or using automation. (Automation valving has been removed while troubleshooting unit).
They removed and disassembled the control valve and visually found nothing wrong.
Any thoughts? Is there an accumulator on the lift circuit? By polishing the compensator spool have they lost the correct fit in the bore? Thanks much.
Submitted: 2 months ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 2 months ago.

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

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