© 2003 SPX Corporation
Sheet No.
Issue Date: Rev. C, 8-13-03
Troubleshooting Guide
Repair procedures must be performed in a dirt-free environment by qualified personnel who are familiar with this equipment.
Jack does not lift 1. Release valve is open.
1. Close release valve.
2. Low/no oil in reservoir.
2. Fill with oil and bleed system.
3. Air-locked system.
3. Bleed system.
4. Load is above capacity of jack.
4. Use correct equipment.
5. Delivery valve and/or bypass
5. Clean to remove dirt or foreign
valve not working correctly.
matter. Replace oil.
6. Packing worn out or defective.
6. Install seal kit.
Jack lifts only partially 1. Too much or not enough oil.
1. Check oil level.
Jack advances slowly 1. Pump not working correctly.
1. Install seal kit, or replace power unit.
2. Leaking seals.
2. Install seal kit.
Jack lifts load, but doesn't hold 1. Cylinder packing is leaking.
1. Install seal kit.
2. Valve not working correctly
2. Inspect valves. Clean and
(suction, delivery, release, or
repair seat surfaces.
bypass).
3. Air-locked system.
3. Bleed system.
Jack leaks oil 1. Worn or damaged seals.
1. Install seal kit.
Jack will not retract 1. Release valve is closed.
1. Open or clean release valve.
Jack retracts slowly 1. Cylinder damaged internally.
1. Send jack to OTC authorized
service center for repair.
2. Link section is binding.
2. Lubricate link section.
Trouble Cause Solution
a. Cracked or damaged housing e. Malfunctioning swivel heads or adjusting screws
b. Excessive wear, bending, or other damage f. Loose hardware
c. Leaking hydraulic fluid g. Modified or altered equipment
d. Scored or damaged piston rod
Preventive Maintenance
IMPORTANT: Dirt is the greatest single cause of failure in hydraulic units.
Keep the service jack clean and well lubricated to prevent foreign matter
from entering the system. If the jack has been exposed to rain, snow, sand,
or grit, it must be cleaned before it is used.
1. Store the jack in a well-protected area where it will not be exposed to corrosive
vapors, abrasive dust, or any other harmful elements.
2. Refer to Figure 2, and regularly (at least once per month) lubricate the moving
parts shown.
3. Add grease to upper arm grease nipple (shown) every three months.
4. Replace the oil in the reservoir at least once per year. To check the oil level,
place the service jack on level ground and lower the lift arm completely.
Remove the filler plug located under the top shroud. The oil level should be
within 3/8" of the filler plug hole. If necessary, add approved anti-wear
hydraulic jack oil, and install the filler plug again. IMPORTANT: The use of
alcohol, hydraulic brake fluid, detergent motor oil, or transmission oil could damage the seals and result in jack failure.
5. Inspect the jack before each use. Take corrective action if any of the following problems are found:
Grease Nipple
Figure 2
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Parts List & Operating Instructions Form No. 520770
