WIRE AS 1495063 - Caterpillar

Specification
Table 1
"Relief Valve (Main) - Test and Adjust"    
Machine Settings    Specification    Actual    
Speed Dial "10"
AEC switch OFF    
35000 500 kPa (5076 73 psi)        
Speed Dial "10"
AEC switch OFF    
38000 500 kPa (5512 73 psi)        Introduction
The main relief valve is located in the front side of the main control valve toward the bottom. The main relief valve is accessible from below the machine after removal of the access plate. The main relief valve limits the maximum operating pressure of the travel hydraulic circuit and the implement hydraulic circuits when the machine is at a load condition.
Illustration 1 g02061253
Main relief valve location on main control valveRequired Tools
Illustration 2 g01623868
Tooling group "B" 198-4240 Digital Pressure Indicator Gp
Table 2
Tool    Item    QTY    Part Number    Description    
B         198-4240     Digital Pressure Indicator Gp    
    B1     1     198-4234     Indicator    
B2 1     198-4239     Pressure Sensor
41,368 kPa (6,000 psi)    
B3 1     198-4236     Extension Cable    Machine Preparation
Position the machine on level ground and stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".
Illustration 3 g02963877
Pressure tap for the drive pump (1) Pressure tap (for drive pump) (2) Pressure tap (for idler pump)
Attach a 41,368 kPa (6,000 psi) pressure sensor to pressure tap (1) for the drive pump.Test Procedure
Start the engine.
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).
Check the pressure reading for the main relief valve pressure setting. Refer to Table 1.Adjustment Procedure
Remove the access plate below the main control valve in order to locate main relief valve (4) .
Illustration 4 g02102305
Main relief valve (A) Adjustment screw (L) Locknut
Loosen the locknut and turn the adjustment screw until the pressure reading at the pressure tap for the drive pump is within the specification. Refer to Table 1 .Note: Turn the adjustment screw clockwise in order to increase the pressure. Turn the adjustment screw counterclockwise in order to decrease the pressure.Note: Always make final pressure adjustments on pressure rise.
Tighten the locknut.