SKYJACK, Page 13SJIII Conventional Series
143911
Section 4 - Troubleshooting Information Service and Maintenance
Hydraulic System
4.2-1 All Function Inoperative
1. Proportional valve 2H-59 defective or is sticking.
Check valve. Replace if defective. -
2. Pump P1 defective.
Check pump. Replace if defective. -
4.2-2 Platform Drifts Down
1. Defective lift cylinder seals at the gland or holding valve manifold.
Replace if damaged. Note: There are no piston seals, just wear rings. -
2. Combination of defective holding valves 2H-13-1 and 2H-13-2, and either defective lowering valve 2H-13
or relief valve R2 or manual lowering valve V1. (ANSI/CSA)
Check valves. Replace if defective. -
Combination of defective holding valves 2H-13B-1 and 2H-13B-2, and either defective lowering valve
2H-13B or relief valve R2 or manual lowering valve V1. (CE)
Check valves. Replace if defective. -
4.2-3 Platform Lifts Slowly
1. Open or leaking manual lowering valve V1.
Close valve. Replace if defective. -
2. Lift relief valve R2 defective.
Check valve. Replace if defective. -
3. Open manual override on holding valve 2H-13-1 or 2H-13-2. (ANSI/CSA)
Depress and turn manual override clockwise to close. Replace if defective. -
Open manual override on holding valve 2H-13B-1 or 2H-13B-2. (CE)
Depress and turn manual override clockwise to close. Replace if defective. -
4.2-4 Platform does not Lift
1. Open manual lowering valve V1.
Close valve. Replace if defective. -
2. Hydraulic oil level too low.
Fully lower the platform. Fill hydraulic tank until fluid is at or slightly above the top mark on the -
sight glass.
3. Platform weight excessive.
Reduce platform load to maximum capacity. -
4. Up valve 3H-14 or 3H-14A (Machines with end of stroke limit switch LS3 only) defective or is sticking.
Check valve. Replace if defective. -
4.2-5 Platform will not Lower
NOTE
Down function is not proportionally controlled.
ANSI/CSA Machines only
1. Lowering valve 2H-13 defective or is sticking.
Clean valve. Replace if defective. -
2. Defective holding valve 2H-13-1 or 2H-13-2.
Clean valve. Replace if defective. -
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