MTN5520
3
rev. 02/04/03
Troubleshooting:
SOLUTION
The release valve is not closed.
✔
Turn the valve clockwise tightly.
Low on hydraulic fluid.
✔
✔
Refill the jack to the correct level of
hydraulic fluid.
Pump seals and back-up ring are defective.
✔
Clean hydraulic fluid passages, replace seals
and renew hydraulic fluid.
(Must be serviced by qualified service center)
The hydraulic system is filled with air. Open
✔
✔
the release valve, pump handle rapidly (4)
full strokes to purge air, close release valve.
Return spring is broken or linkages binding.
✔
Replace spring if broken. Grease pivot shaft,
oil all lift arm linkages.
Discharge ball is not sealing hydraulic system
and oil may be dirty. Manually flush
hydraulic system by raising and lowering lift
✔
arm by hand. Open the release valve, as
required to raise and lower the lift arm.
Manually raise and lower lift arm.
PROBLEM
Jack will not lift load
Jack will not hold load
or handle rises
Jack will not lift to
its full height
Jack will not lower
completely
Jack will not lift smoothly
or jack feels spongy
