KIT-SEAL 5329807 - Caterpillar

Specification
Table 1
"Relief Valve (Pilot) - Test and Adjust"
Item Machine Settings Specification Actual
Pilot Relief Valve Speed Dial "1"
AEC switch OFF 3950 200 kPa (573 29 psi)
Speed Dial "10"
AEC switch OFF 4200 200 kPa (609 29 psi) Introduction
The pilot relief valve is located on the pilot manifold. The pilot manifold is located below the main control valve. The pilot relief valve limits the pressure in the pilot system. The pilot relief valve setting is adjustable.Required Tools
Illustration 1 g02726620
Table 2
Tool Item Qty Part No Description
B B1 1 8T-0856 Pressure Gauge
6000 kPa (870 psi)
B2 1 6V-3989 Fitting
B3 2 6V-4143 Quick Connect Coupler
B4 1 177-7862 Hose As
5.5 m (18 ft) Test Preparation
Place the machine on level ground.
Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".
Illustration 2 g03385093
Pilot Filter
(1) Pressure tap
(2) Pilot filter
Connect a 6000 kPa (870 psi) pressure gauge to pressure tap (1). Test Procedure
Start the engine.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).
Place the machine controls at the following settings: engine speed dial "1" and AEC switch OFF.
Check the pilot relief valve setting at pressure tap (1).
The pilot relief valve setting should be 3950 200 kPa (573 29 psi).
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF.
Check the pilot relief valve setting at pressure tap (1).
The pilot relief valve setting should be 4200 200 kPa (609 29 psi). If the pilot relief valve setting is not within the specification, then adjust the pilot relief valve. Adjustment Procedure
Illustration 3 g03385116
Pilot manifold (located below main control valve)
(3) Adjustment screw
(4) Locknut
(5) Pilot relief valve
(6) Pilot manifold
In order to adjust the pilot relief valve, loosen locknut (4).
Turn adjustment screw (3) until the pressure reading at pressure tap (1) is within the specification. Note: Turn adjustment screw (3) clockwise in order to increase the pressure. Turn adjustment screw (3) counterclockwise in order to decrease the pressure.Note: Always make final pressure adjustments on pressure rise.
Tighten locknut (4) to a torque of 49 5 N m (36 4 lb ft).
Test the pressure setting again. Refer to "Specification". Note: Normal operation of the engine and pumps are necessary for the pressure adjustment. If the results of the pressure adjustments are not correct, then check the engine and the pump characteristic curve.