PANEL AS-GENERATOR 9Y2228 - Caterpillar

Hydraulic oil pressure can remain in the hydraulic system on this machine after the engine and pump have been stopped. Serious injury can result if this pressure is not released before any service is done on the hydraulic system. In order to prevent possible injury, release the hydraulic system pressure before working on any fitting, hose, or hydraulic component.Lower all work tools to the ground before service is started. If the hydraulic system must be serviced, tested, or adjusted with the work tool in the raised position, the work tool and lift cylinders must be supported properly.Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.
Relief Valve for Head End of Lift Cylinder
Illustration 1 g00760015
Relief valve for head end of lift cylinder (1) Retainer Assembly (2) Nut (3) Seal (4) Plate (5) Valve (6) Seal (7) Spring (8) WasherNote: The relief valve can only be tested on a test bench. Use a 1U-9358 Manifold in order to test the valve.The correct pressure setting for the relief valve on the lift cylinder is 34500 500 kPa (5000 72 psi) at a flow of 38 4 L/min (10 1 US gpm).