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Section 4 – Troubleshooting Information Hydraulic System
4.3 Hydraulic System
4.3-1 All Functions Inoperative
1. Electric Motor DCM1 not engaged. Refer to electrical troubleshooting.
2. Pump P1 defective.
Check system pressures and Pump P1
functionality. Replace if defective.
4.3-2 All System Sluggish
1. System Relief Valve R1 defective or not adjusted
properly.
Adjust valve. Replace if defective.
2. Hydraulic pump P1 worn.
Check system pressure and flow from Pump P1.
Replace if defective.
4.3-3 Platform Drifts Down
1. Defective or leaking Lift Cylinder(s) seals at the
gland.
Replace if damaged.
Note: There are no piston seals, just wear rings.
2. Combination of stuck or defective Holding valve
2H-13.
Check valves. Replace if defective.
4.3-4 Platform Lifts Slowly
1. Defective Lift valve 3H-14. Check valve. Replace if defective.
2. Lift Relief valve R2 is set incorrectly. Check pressures. Replace if defective.
3. Defective Holding valve 2H-13.
Check Holding valve 2H-13.
Replace if defective.
4. Defective or plugged Lift Orifice O3. Clean Orifice. Replace if defective.
4.3-5 Platform Does Not Lift
1. Defective Lift valve 3H-14. Check 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. Machine overloaded and Overload Lights PL-1
and PL-2 on Emergency Stop buttons flashing.
Check machine limits and reduce weight as
required.
Refer to Electrical troubleshooting.
4. Defective or plugged Lift Orifice O3. Clean Orifice. Replace if defective.
5. Leaking or defective Lift cylinder C1. Check cylinder(s). Replace if defective.
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