CARRIER 5T8173 - Caterpillar

Hydraulic oil pressure can remain in the hydraulic oil system on this machine after the engine and pump have been stopped. Personal injury can be caused if this pressure is not released before any service is done on the hydraulic systems. To prevent personal injury, refer to the procedure in Testing and Adjusting Manual, "Release of Pressure in the Hydraulic System".When possible, the bucket must always be lowered to the ground with the cutting edge rotated to the ground before service is started. When it is necessary for the boom to be in the raised position while tests or adjustments are done, be sure that the boom, stick and bucket have correct support.Be sure the swing parking brakes and the travel parking brakes are on and the brake release lines are disconnected and plugged.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.
Table 1
Required Tools    
Part Number    Part Description    Qty    
4C-4892     ORFS Fittings Group     1    
8T-0857     Pressure Gauge     1    
8T-0856     Pressure Gauge     1    Note: Always warm the hydraulic oil to a minimum temperature of 50°C (122°F) before starting the testing and adjusting procedure.Note: Always set the high pilot system pressure before setting the low pilot system pressure.Note: After an adjustment to the pilot relief valve, recalibrate the Caterpillar underspeed system.Relief Valve for the High Pressure Pilot Circuit
Preparation
Illustration 1 g00800431
Pilot manifold (1) Relief valve for the high pressure pilot circuit (2) High pilot pressure tap
Illustration 2 g00813449
Pilot hydraulic oil filter (3) High pilot pressure tapConnect a 10000 kPa (1450 psi) pressure gauge to the high pilot pressure tap (2) at the pilot manifold or to the high pilot pressure tap (3) at the pilot hydraulic oil filter.
Start the engine.
Warm the oil to a minimum temperature of 50 °C