PLATE & FILM GP 2161271 - Caterpillar

Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Table 1
Required Tools    
Tool     Part Number     Description     Qty    
A     198-4240     Digital Pressure Indicator     1    
Illustration 1 g00742948
Rear of Tractor (1) Test port
Connect Tool (A) to test port (1) .
Start the engine and run the engine at low idle.
Put the bowl on the ground and lower the apron.
Move the joystick control to the bowl RAISE position. The pressure gauge should read 3600 400 kPa (520 60 psi).Note: The pilot oil pressure should also read 3600 400 kPa (520 60 psi) when the joystick control is in any of the following positions:
Bowl LOWER position
Bowl RAISE position
Ejector FORWARD position
Ejector REVERSE position
Apron RAISE position
Apron LOWER position
Illustration 2 g00743072
Pressure Reducing Valve (2) Nut (3) Adjustment screw
If it is necessary to adjust the pressure reducing valve, loosen nut (2) and use an allen wrench to turn adjustment screw (3) .Note: One turn of the adjustment screw changes the pressure by approximately 310 kPa (45 psi).
When you have completed the test, remove the test equipment from the machine.