PLATE 3840801 - Caterpillar

Illustration 1 g00340876
Pump compartment (1) Pressure tap (power shift pressure) (2) Pressure tap (upper pump delivery pressure) (3) Pressure tap (lower pump delivery pressure)
Attach a 60000 kPa (8700 psi) pressure gauge to pressure tap (2) .
Start the engine.
Place the machine controls at the following settings: Power Mode and engine speed dial "10".
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).
Open the bucket until the bucket cylinder rod is at the full retraction.
Check the main relief valve pressure setting at pressure tap (2) .
Return the bucket control lever to the NEUTRAL position.
The main relief valve pressure setting should be 34300 490 kPa (4950 72 psi). If the main relief valve pressure setting is not within the specification, adjust the main relief valve pressure setting.
Illustration 2 g00341013
(4) Adjustment screw (5) Locknut (6) Main relief valve
In order to adjust the main relief valve, loosen locknut (5) and turn adjustment screw (4) until the pressure gauge reading at pressure tap (2) is 34300 490 kPa (4950 72 psi).Note: Turning adjustment screw (4) clockwise increases the pressure. Turning adjustment screw (4) counterclockwise decreases the pressure.Note: Always make final pressure adjustments on pressure rise.
Tighten locknut (5) to a torque of 50 10 N m (37 7 lb ft).