KYJACK, Page 13
JIII Conventional eries
143911
ection 4 - Troubleshooting Information
ervice and Maintenance
Hydraulic ystem
4.2-1
All Function Inoperative
1. Proportional valve 2H-59 defective or is sticking.
Check valve. Replace if defective.
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2. Pump P1 defective.
Check pump. Replace if defective.
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4.2-2
Platform Drifts Down
1. Defective lift cylinder seals at the gland or holding valve manifold.
Replace if damaged. Note: here are no piston seals, just wear rings.
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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.
(AN I/C A)
Check valves. Replace if defective.
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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.
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4.2-3
Platform Lifts lowly
1. Open or leaking manual lowering valve V1.
Close valve. Replace if defective.
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2. Lift relief valve R2 defective.
Check valve. Replace if defective.
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3. Open manual override on holding valve 2H-13-1 or 2H-13-2.
(AN I/C A)
Depress and turn manual override clockwise to close. Replace if defective.
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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.
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4.2-4
Platform does not Lift
1. Open manual lowering valve V1.
Close valve. Replace if defective.
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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
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sight glass.
3. Platform weight excessive.
Reduce platform load to maximum capacity.
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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.
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4.2-5
Platform will not Lower
NOTE
Down function is not proportionally controlled.
AN I/C A Machines onl
y
1. Lowering valve 2H-13 defective or is sticking.
Clean valve. Replace if defective.
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2. Defective holding valve 2H-13-1 or 2H-13-2.
Clean valve. Replace if defective.
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