1. Engine High Idle Speed
2. Warm oil over relief function to minimum 66ยฐC (150ยฐF). Cycle all functions during warm up procedure.
Warm oil until the pressure build-up valve stabilizes near its target pressure.
3. Activate function until cylinder movement stops. Hold over relief for 5 – 10 seconds.
Record pressure.
Connect the test gauge coupler and 34474 kPa (345 bar) (5000 psi) gauge from the test kit to the PPS2 diagnostic coupler (Item 1) [Figure 20-32-1].
Remove the floor mat and floor plate. (See Removal And Installation on Page 40-110-1.)
Disconnect the two hoses and fittings (Item 1) [Figure 20-32-2] from the swing motor.
Install caps (Item 1) [Figure 20-32-3] on both hoses.
Lower the control console and fasten the seat belt.
Start the engine and run at full rpm until hydraulic fluid is at operating temperatures 66ยฐC (150ยฐF).
Engage the upperstructure slew right function. Record the pressure on the gauge.
Engage the upperstructure slew left function. Record the pressure on the gauge.
The crossport relief valve pressure should be as follows:
A target pressure of 24097 kPa (241 bar) (3495 psi) with an acceptable range of 23601 – 25000 kPa (236 – 250 bar) (3423 – 3626 psi).
Stop the engine.
If the crossport relief valve does not meet specifications, remove, clean and inspect the valve. Reinstall the valve and retest. If the valve still does not meet specifications, replace the valve.
