MH3022, MH3024 and MH3026 Material Handlers Hydraulic System Caterpillar

Relief Valve (Steering) - Test

Usage:

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This procedure is utilized to verify that the steering relief valves are functioning properly within specifications.

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Illustration 1	g01623868
Tooling (B) 198-4240 Digital Pressure Indicator Gp

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Table 2
Required Tools
Tool	Item	Qty	Part Number	Description
B			198-4240	Digital Pressure Indicator Gp
	B1	1	198-4234	Indicator
	B2	1	198-4238	Pressure Sensor 34,450 kPa (5,000 psi)
	B3	1	198-4236	Extension Cable

Clear all personnel from the machine and from the area around the machine.
Start the engine.
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Illustration 2 g02449876

Engine speed dial
Set the engine speed dial at "10".
Lower the left console.
Position the machine on level ground. Check the visibility and adjust the mirrors for the best vision close to the machine.
Fully depress the service brake pedal until the service brake pedal locks mechanically.
Increase the hydraulic oil temperature to 46° to 60° C (115° to 140° F).
Lower the stabilizers and the blade tip.
Fully extend the bucket cylinder and place the bucket on the ground.
Stop the engine.
Release the pressure in the hydraulic system.
Note: Refer to Testing and Adjusting, "System Pressure - Release".
Raise the left console.
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Illustration 3 g03857979

Medium pressure tap (steering, auxiliary tool, brake, and pilot pump pressure) is located behind the front left access door
Attach tooling (B2) 34,450 kPa (5,000 psi) pressure sensor to the medium pressure tap.

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Personal injury or death can result from sudden machine movement.
Sudden movement of the machine can cause injury to persons on or near the machine.

To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

Start the engine.
Set the engine speed dial at "10".
Turn the steering wheel counterclockwise until the steering wheel stops.
Hold the steering wheel against the stop and check the pressure at the medium pressure tap. Refer to Table 1 for the correct pressure.
Turn the steering wheel clockwise until the steering wheel stops.
Hold the steering wheel against the stop and check the pressure at the medium pressure tap. Refer to Table 1 for the correct pressure.