ACTUATOR AS 2045099 - Caterpillar

Introduction
The following procedure will explain the steps for testing the steering relief valve.Required Tools
Illustration 1 g01879273
Tooling (D)
Table 1
Tool Item Part Number Description Qty
D 1U-5796 Pressure Differential Tool Gp 1
D1 177-7861 Hose As 2
D2 6V-4143 Quick Connect Coupler 4
D3 6V-3965 Fitting 3
D4 6V-4144 Quick Connect Coupler 1
D5 8T-0859 Pressure Gauge
(0 TO 25,000-KPA (0 TO 3,600-PSI)) 1
D6 8C-8431 Tee 1
D7 1U-5793 Oil Filter Pressure Differential Gauge Gp 1
D8 6V-0484 O-Ring Adapter 1
F 1U-7577 Hex Wrench 1 Machine Preparation
Move the machine to a smooth horizontal location.
Chock the wheels.
Lower all the implements.
Illustration 2 g01727175
Side view of the combination valve
(1) Port for the pressure switch
(2) Supply port for the valve group
(3) Supply port for the valve group
(4) Signal port for steering
(5) Steering relief valve
(6) Signal relief valve
(7) Signal port for the pump
(8) Signal purge valve
(9) Signal port for the implement control valve
(10) Pressure test port for implement and steering pump
(11) Port for the auxiliary return line
(12) The implement relief valve
(13) Return port for the valve group
(14) Return port to the hydraulic tank
(15) Supply port for steering
(16) Port for the secondary steering pump
Remove the dust cover from the pressure test port for the implement and steering pump (10). Install the pressure gauge in the test port.Test Procedure
Start the engine and operate the engine at high idle. Cycle the implements until the hydraulic oil reaches normal operating temperature.
Steer the wheel left against the stop or turn the wheel right against the stop. The pressure gauge should read 19500 400 kPa (2828 58 psi). This pressure is the maximum steering pressure.
If the maximum steering pressure is incorrect, stop the engine and adjust steering relief valve (5). Turn the adjustment screw clockwise to increase the pressure setting and turn the adjustment screw counterclockwise to decrease the pressure setting. One turn of the adjustment screw provides an approximate change of 5300 kPa (770 psi).