SECTION 4, Page 11SJIII Series - The Conventionals 129919
Troubleshooting Information - Hydraulic System
Probable Cause Remedy
4.2-9. Brake(s) Will Not Release (Machines with Integral Brakes)
1. Stuck or defective auto reset value (V3).
2. Stuck or defective hand pump (P2).
3. Defective internal brake piston seals.
1. Check valve operation. Clean valve. Replace if
defective.
2. Check pump operation. Clean pump. Replace if
defective.
3. Check brake pack will maintain pressure. If pressure
is not maintained replace seals.
1. Worn or damaged brake discs.
2. Broken or damaged brake compression springs.
1. Inspect brake discs for wear. Replace if worn or
damaged.
2. Check springs. Replace if defective.
4.2-10. Machine Will Not Hold on a Grade (Machined with Integral Brakes)
4.2-11. Platform Does Not Steer
1. Right Steer Valve (4H-23) or Left Steer Valve (4H-24)
defective or sticking.
2. Steer Cylinder (C3) seals leaking.
3. Mechanical binding in King Pins.
4. Orifices (03) plugged.
1. Clean valve. Replace if defective.
2. Rebuild cylinder(s). Replace if damaged.
3. Check for binding. Repair as needed.
4. Clean Orifices, and reinstall.
1. System Relief Valve defective or not adjusted properly.
2. Hydraulic pump (P1) worn.
3. Compensator Valve (CMP1) defective.
4. Proportional Valve (2H-59B) contaminated or
defective.
1. Adjust valve. Replace if defective.
2. Check pump. Replace if defective.
3. Clean. Replace if defective.
4. Clean, replace if defective.
4.2-12. All Systems Sluggish
1. Platform Extend Valve (4H-26) or Platform Retract
Valve (4H-27) defective or is sticking.
2. Powered Platform Cylinder (C5) seals defective.
3. Mechanical binding in powered platform
mechanism.
1. Clean valve. Replace if defective.
2. Rebuild cylinder. Replace if damaged.
3. Check for binding. Repair as needed.
4.2-14. High/Low Torque Inoperative
1. Stuck Speed Valve (3H-18A-1).
2. Stuck Speed Valve (3H-18A-2).
1. Clean valve. Replace if defective.
2. Clean valve. Replace if defective.
4.2-13. Power Extension Platform Will Not Extend Or Retract
AF
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