BONNET-OIL COOLER 7N4939 - Caterpillar

Test Preparation
Refer to Testing and Adjusting, "Machine Preparation for Troubleshooting".Refer to Testing and Adjusting, "System Pressure Release".
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Move steering frame lock to the LOCKED position.
Engage the parking brake. Move the transmission direction selector to the NEUTRAL position.
Operator present in seat.
The left armrest must be down.Test Procedure
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(1) Location of the remote pressure taps (hydraulic service center). Right side of machine.
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(2) Pressure tap for the steering pump pressure
Attach a 0 kPa to 25000 kPa (0 psi to 3600 psi) pressure gauge to pressure tap (2). Pressure tap (2) is on the right side of the machine in the hydraulic service center.
Start the engine. Operate the engine at high idle. Move the tilt control lever to the TILT BACK position in order to increase the temperature of the oil to normal operating temperature.
After the oil has reached normal operating temperature, position the bucket and any attachments slightly off the ground. Run the engine at high idle.Note: During the following step, do not keep the steering pump at stall condition for more than 10 seconds. If necessary, release the STIC steering control lever and wait for 30 seconds before you repeat the step.
Move the STIC steering control lever to the right to command full articulation. Continue to move the STIC steering control lever in the full articulation position in order to obtain a reliable pressure reading.
Record the pressure reading on the pressure gauge. The reading should be 23400 700 kPa (3395 102 psi).
Lower the work tool to the ground. Stop the engine.
Relieve the hydraulic pressure.Reference: For the correct procedure to relieve any hydraulic oil pressure that may be in the steering system, refer to the Service Manual module for Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being tested.
If the pressure reading is correct, remove the hose