PLATE 4730240 - Caterpillar

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(Typical Example) Remote Location (If Equipped)
Install a 0 to 3400 kPa (0 to 500 psi) pressure gauge on pressure port "PILOT-S" on the diagnostic plate. Make sure that the hydraulic tank filler cap is tight.
Start the engine. Allow the oil to reach normal operating temperature. Check the reading on the pressure gauge. With the machine at low idle, the correct pilot oil pressure should be 2400 150 kPa (350 20 psi) at 35 L/min (9 US gpm) and 49 °C (120 °F).
Stop the engine. Release all pressure in the steering system and in the braking system.
If the pressure reading is within the specification, remove the pressure gauge and proceed to "Adjusting Pilot Pressure of the Primary Steering Pump".If the pressure reading was not within the specification, proceed to Step 6.
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Steering pilot relief valve
(5) Steering pilot relief valve
(8) Locknut
(9) Adjustment screw
Locate steering pilot relief valve (5). Loosen locknut (8) and turn adjustment screw (9), as required. Turning adjustment screw (9) clockwise increases pilot oil pressure. Turning adjustment screw (9) counterclockwise decreases pilot oil pressure. One turn of adjustment screw (9) changes the pilot oil pressure by approximately 1895 kPa (275 psi).
Hold adjustment screw (9) in place and tighten locknut (8) to a torque of 10 N m (90 lb in).
Start the engine. Allow the oil to reach normal operating temperature. Check the reading on the pressure gauge. With the engine at low idle, the correct pilot oil pressure should equal 2400 150 kPa (350 20 psi).
If the pilot oil pressure is not within the specification, repeat Steps 6 through 8.If the pilot oil pressure cannot be adjusted to the specification, install a new steering pilot relief valve. If you install a new steering pilot relief valve, make sure that you check the pilot oil pressure again.Note: If the pilot oil pressure is not within the specification after installation of a new steering pilot relief valve, check the condition of the oil filter. Replace the oil filter if the oil filter is contaminated with debris. Check the oil filter bypass valve. The oil filter bypass valve should not open until a pressure of 172 kPa (25 psi) is reached. If the oil filter and the oil filter bypass valve pass inspection, the steering pilot pump may be worn or damaged. Replace these components, as needed.
When the pressure reading is within the specification, stop the engine. Release all pressure in the steering system and in the braking system.
Remove the pressure gauge. Perform the second procedure "Adjusting Pilot Pressure of the Primary Steering Pump".Adjusting Pilot Pressure of the Primary Steering Pump
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(10) Fitting
Disconnect fitting (10) on the steering control valve. Install a tee between the steering control valve and fitting (10).
Connect fitting (10) to the tee. Install a 0 to 3400 kPa (0 to 500 psi) pressure gauge on the unused tee fitting.
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Steering pilot relief valve
(5) Steering pilot relief valve
(8) Locknut
(9) Adjustment screw
Loosen locknut (8) on steering pilot relief valve (5). Turn adjustment screw (9)