938G Series II Wheel Loader and IT38G Series II Integrated Toolcarrier Steering System Steering System Pressure (High Pressure Stall)

Steering System Pressure (High Pressure Stall) - Test

938G Series II Wheel Loader and IT38G Series II <BR>Integrated Toolcarrier Steering System [RENR6072]

938G Series II Wheel Loader and IT38G Series II Integrated Toolcarrier Steering System Piston Pump (Steering) Low Pressure Standby - Test

STEERING SYSTEM

PUMP GP

IT38G Integrated Toolcarrier and 938G Wheel Loader Steering System Pump Performance (Steering) - Test

938G Series II Wheel Loader and IT38G Series II Integrated Toolcarrier Steering System Steering System Pressure (High Pressure Stall) - Test

938G Series II Wheel Loader and IT38G Series II Integrated Toolcarrier Steering System Piston Pump (Steering) Low Pressure Standby - Test

938G Series II Wheel Loader and IT38G Series II Integrated Toolcarrier Steering System Piston Pump (Steering) Margin Pressure - Test and Adjust

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Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "AVSpare Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on AVSpare products. Dispose of all fluids according to local regulations and mandates.

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Table 1
Required Tools
Part Number	Description	Qty
4C-4890	Hydraulic Test Group	1
8T-5320	Hydraulic Test Group	1

The maximum pressure in the steering system is limited to 22800 ± 350 kPa (3305 ± 50 psi) by the pump control section (pressure and flow compensator valve) of the steering/pilot pump.

Fully articulate the machine in order to achieve a stall condition. Maintain force on the steering wheel in order to achieve maximum pressure in the steering/pilot pump.

Use the following procedure in order to determine whether the steering pressure is being regulated correctly by the control section of the steering/pilot pump:

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Illustration 1	g00280787
Steering Frame Lock

Install the steering frame lock.

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Illustration 2	g00280978
Cab has been removed for photographic clarity. Steering/Pilot Pump (1) Pressure tap.

Install a 27000 kPa (4000 psi) pressure gauge at pressure tap (1) .

Start the engine and run the engine at low idle. Allow the hydraulic oil to reach normal operating temperature.

Now, operate the engine at high idle and turn the steering wheel against the steering frame lock.

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Illustration 3	g00280832
Rubber Stop Pad

Note: If the steering frame lock cannot be used, turn the steering wheel so that the machine is fully articulated. Continue to turn the steering wheel against the rubber stop pads on the frames.

Note the reading on the pressure gauge. The reading should be 22800 ± 350 kPa (3305 ± 50 psi).

Stop the engine and remove the pressure gauge from the pressure tap.

Note: Do not keep the steering/pilot pump at stall condition for more than ten seconds. If necessary, release the steering wheel and wait for 30 seconds before you repeat the procedure.

Reference: For the correct test procedure, refer to Testing and Adjusting, " Piston Pump (Steering) Margin Pressure - Test and Adjust".