SKYJACK, Page 91
SJRT Compact Series
Engine Powered
4.2-1. All Functions Inoperative
1. Hydraulic oil level low.
- Refill tank to proper level.
2. Defective pump (P1).
- Check pump. Repair or replace if defective.
3. Broken engine to pump coupler.
- Check coupler. Replace if defective.
4. Relief valve (R1) open.
- Check valve. Replace if defective.
4.2-2. Steering Inoperative
2. Stuck or defective steer right valve (4H23A) or steer left valve (4H24A).
- Check valves. Replace if defective.
3. Steer cylinder (C7) damaged or bypassing internally.
- Check cylinder. Repair or replace if defective.
4.2-3. Lift, Steer and First Drive Speed Inoperative
1. Small pump dump valve (2H18B) stuck open.
- Check valve. Repair or replace if defective.
2. Worn or defective small pump section of pump (P1).
- Check pump. Repair or replace if defective.
3. Check valve (CV1) or (CV2) stuck.
- Check valves. Clean or replace if defective.
4.2-4. Second Drive Speed Inoperative
1. Large pump dump valve (2H17A) stuck open.
- Check valve. Repair or replace if defective.
2. Worn or defective large pump section of pump (P1).
- Check pump. Repair or replace if defective.
3. Check valve (CV1) or (CV2) stuck.
- Check valves. Clean or replace if defective.
4.2-5. Drive Inoperative
1. Stuck or defective drive reverse valve (4H15A) or drive forward valve (4H16A).
- Check valves. Repair or replace if defective.
2. Defective drive relief valve (R5).
- Check valve. Replace if defective.
3. Stuck or defective main counterbalance valve (CB1).
- Check valve. Repair or replace if defective.
4. Defective drive motor (M1), (M2), (M3) or (M4).
- Check motor. Repair or replace if defective.
5. Free wheeling valve (V2) open or defective.
- Close valve. Repair or replace if defective.
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