Case 5220, 5230, 5240, 5250 Maxxum Tractor Repair Service Manual

Table of Contents

General
Engine
Fuel System
Electrical
Steering
Transmission
Brakes
Hydraulics
Chassis

Manual Extract: PFC HYDRAULIC PUMP TROUBLESHOOTING

The following problems may affect compensator/pump performance and must be checked before replacing the compensator valve.

1. Low charge pump pressure may cause the main pump to cavitate. Refer to TEST 2, page 50.
2. Low charge pump pressure will be recorded if the lubrication relief valve is not closing properly. Refer to TEST 1, page 48.
3. Low standby pressure will be high if the orifice in the steering signal line is restricted. Refer to TEST 4, page 54.
4. Main hydraulic pump will go to steering relief pressure if the orifice in the steering signal line is blocked. Refer to TEST 15, page 76.
5. Steering may be erratic if the steering signal line is contaminated with foreign materials. Refer to Section 5001.
6. No steering if the orifice in the steering supply fine is blocked. Refer to Section 5001.
7. Powershift may fail at low engine rpm when rapidly steering if the orifice in the steering supply line is missing. Refer to TEST 6, page 58 and Section 5001.
8. Leaks in the P1 circuit will result in poor compensator performance. Refer to TEST 5, page 56.
9. If the X4 check valve in the position feedback valve is stuck in the open position the hitch will have poor lifting capacity. Refer to TEST 17, page 80 and Section 8004.
10. If the X4 check valve is closed (position sensor linkage broken) the main pump will go to high pressure when the hitch is raised fully. Refer to TEST 17, page 80 and Section 8004.