Possible Causes
Corrective Action
Hydraulic stage
will not lift load
Will not lift to full extension
•
Overload condition
•
Low oil level
• Hydraulic unit malfunction
•
Oil level low
•
Oil level low
•
Remedy overload condition
•
See Maintenance "Adding oil"
• Contact Hein-Werner Technical Service
•
Ensure proper oil level
•
Ensure proper oil level
Poor lift performance
Hydraulic stage will not lower after
unloading
•
Hydraulic unit malfunction
•
Contact Hein-Werner Technical Service
TROUBLESHOOTING
Symptom
Air stage will not lift load
•
Air valve maybe dirty or leaking
•
Clean the air valve (refer to"Cleaning" under
Maintenance
Air stage will not hold load
•
Air leak
•
Contact Hein-Werner Technical Service
Cleaning (refer to Figure 7 on Page 7)
Occasionally pieces of scale or rust from the airline will become lodged under the rubber seats of the air valve causing air
leakage. This leakage is easily detected since the lift will raise slowly when you connect the airline to the quick coupler
inlet even thought the valve lever has not been touched. If this occurs, the inlet side of the valve needs cleaning. The lift
may also lower slowly when you disconnect the airline from the quick coupler even though the valve lever has not been
touched. If this occurs, either the inet side or both sides of the valve needs cleaning. To clean, refer to Figure 7 on Page
7 and follow these instructions:
1. Remove fittings (1) from the ends of the air control valve.
2. Use a stiff wire or nail to push the valve spools (2) out of the valve body (3) from center to outside.
3. Carefully examine the valve seats (4) for any scale, dirt or foreign matter is embedded in the valve seat, remove the screws
(5) and cap (6) from the ends of the spools and clean the seat and turn over and reassemble.
4. Lubricate the valve spool with light chassis grease.
5. Reassemble the valve in this order:
(I) Insert valve spools
(II) Insert the springs
(III) Assemble hexagonal fittings into the body
6. The valve should now operate like new.
Storage
When not in use, store the jack with saddle fully lowered.
