SKYJACK, Page 14 SJIII Conventional Series
143911
Section 4 - Troubleshooting InformationService and Maintenance
Hydraulic System (Continued)
CE Machines only
3. Lowering valve 2H-13 defective or is sticking.
Clean valve. Replace if defective. -
4. Defective holding valve 2H-13B-1 or 2H-13B-2.
Clean valve. Replace if defective. -
4.2-6 Platform Drives Slow
1. Free-wheeling valve V2 open or defective.
Close valve. Replace if defective. -
2. Flow divider/combiner FD1 defective or is plugged.
Close valve. Replace if defective. -
3. Drive motor M1 or M2 defective.
Check motors. Replace if defective. -
4. Cushion cylinder C1 defective.
Check cylinder. Replace if defective. -
4.2-7 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.
Close Valve. Replace if defective. -
3. Flow/Divider/Combiner valve FD1 defective or is plugged.
Close Valve. Replace if defective. -
4. Counterbalance valve CB1 defective or is plugged.
Close Valve. Replace if defective. -
4.2-8 Brake(s) will not Release
1. Brake valve 3H-17A defective or is sticking.
Clean valve. Replace if defective. -
2. Brake orifice(s) 07 plugged.
Remove orifice(s). Clean and reinstall. -
3. Brake cylinder(s) C4 defective.
Rebuild cylinder(s). Replace if damaged. -
4.2-9 Brake(s) will not Release (Additional for machines with Integral Brakes)
1. Stuck or defective auto reset value V3.
Check valve operation. Clean valve. Replace if defective. -
2. Stuck or defective hand pump P2.
Check pump operation. Clean pump. Replace if defective. -
3. Defective internal brake piston seals.
Check brake pack will maintain pressure. If pressure is not maintained replace seals. -
4. Plugged or defective brake orifice 07.
Clear obstruction. Replace if defective. -
5. Damaged integral brake in wheel motor.
Inspect wheel motor assembly. Repair and replace as necessary. -
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