Platform Will Not Lower; Platform Lowers Slowly; Platform Drives Slow; Platform Will Not Drive In Forward Or Reverse - Skyjack SJ 3215 Service Manual

Section 4 - Troubleshooting Information
Hydraulic System (Continued)
4.2-6

Platform will not Lower

1. Lowering valve 2H-13 (ANSI/CSA) or 2H-13B (CE) defective or is sticking.
- Clean valve. Replace if defective.
2. Defective holding valve 2H-13-1(ANSI/CSA) or 2H-13B-1 (CE).
- Clean valve. Replace if defective.
3. Lowering orifice O2 (Model 3219) plugged or contaminated.
- Clear debris. Replace Orifice. Replace if defective.
4. Emergency lowering orifice O6 plugged or contaminated.
- Clear debris. Replace Orifice. Replace if defective.
5. Plugged deceleration valve 2H-13A (ANSI/CSA) or 2H-13C (CE).
- Clear obstruction from valve. Replace if defective.
4.2-7

Platform Lowers Slowly

1. Stuck or defective deceleration valve 2H-13A (ANSI/CSA) or 2H-13C (CE).
- Check valve. Replace if defective.
4.2-8

Platform Drives Slow

1. Free-wheeling valve V2 open or defective.
- Close valve. Replace if defective.
2. Drive motor M1 or M2 defective.
- Check motors. Replace if defective.
3. Cushion valve 2H-25 is stuck or defective.
- Check valve. Replace if defective.
4.2-9

Platform will not Drive in Forward or Reverse

1. Open free-wheeling valve V2.
- Close Valve. Replace if defective.
2. Forward drive valve 4H-16 or reverse drive valve 4H-15 defective or is sticking.
- Clean Valve. Replace if defective.
3. Counterbalance valve CB1 defective or is plugged.
- Clean Valve. Replace if defective.
SKYJACK, Page 12
NOTE
Down function is not proportionally controlled.
Service and Maintenance
SJIII Compact Series
143909