SKYJACK, Page 12 SJIII Compact Series
143909
Section 4 - Troubleshooting Information Service and Maintenance
Hydraulic System (Continued)
4.2-6 Platform will not Lower
NOTE
Down function is not proportionally controlled.
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. -
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