STUD 2F8092 - Caterpillar

Illustration 1 g00945669
Location of the Pressure Reducing Valve in the Main Control Valve (Implement) (1) Outlet section (2) Pressure reducing valveThe pilot pressure for the main control valve (implement) is controlled by pilot reducing valve (2) in outlet section (1) of the main control valve (implement). Pilot Pressure Test
Introduction
The test indicates if the pressure reducing valve in the supply line to the main control valve (implement) is set correctly. The pressure reducing valve supplies oil at reduced pressure in order to activate the pilot valves in the main control valve (implement), and the control valve Gp (stabilizer), if equipped.Reference: See Systems Operation/Testing and Adjusting, "Outlet Manifold" for more information.Required Tools
Use the following test equipment in order to perform the following procedure:
Appropriate pressure gaugesTable 1 provides a list of the tools that are required in order to perform the following test procedure.
Table 1
Required Tools    
Tool     Part Number     Part Description     Qty    
A     6V-7830     Pressure Gauge     1    Warming the Transmission Oil
In order to ensure that the transmission oil is at the normal operating temperature of 60° 10°C (140° 18°F), complete the following procedure:
Apply the service brakes and start the engine.
Run the engine for 2 minutes at Low Idle. Then, run the engine for 2 minutes at High Idle.
Disengage the parking brake. Ensure that the switch that disables the transmission neutralizer control is in the OFF position. Refer to the Operation and Maintenance Manual, "Transmission Neutralizer Control".
Move the transmission control to the FOURTH SPEED position with the drive in the NEUTRAL position. Depress the accelerator pedal until the engine speed has reached high idle. The high idle speed is 2350 25 (rpm).
Move the transmission control to the FORWARD position and stall the torque converter until the transmission oil temperature gauge in the cab reads 3/4 of the way to the red line.Note: To ensure that the transmission oil does not get too hot, do not keep the torque converter in a full stall condition for more than 10 seconds.
Move the transmission control to the NEUTRAL position and continue to run the engine at high idle until the needle of the transmission oil temperature gauge returns to the middle of the scale.
Repeat Step 5 and Step 6 until the proper hydraulic oil temperature is obtained.Test Procedure
Personal injury can result from removing hoses or fittings in a system under pressure.Failure to relieve pressure can cause personal injury.Do not remove or disconnect hoses or fittings until all pressure in the hydraulic system has been relieved.
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.
Note: Ensure the use of