Possible Cause: Relief cartridge in pump may be contaminated.
Dirt in the relief valve may hold the relief valve open slightly allowing hydraulic oil to bypass the valve, causing the dump bed to drift down.
Replace relief cartridge.
Within 12- month warranty period call 800-777-2671, ask for the Warranty Department, after 12 months ask for the Parts Department. (Body serial number needed)
Possible cause: If the relief cartridge has been replaced and the body is still not holding, call 800-777-2671, ask for Warranty Dept. and we will have a technician trouble shoot with you over the phone. (Body serial number needed)