MAHA MPJ Series Original Operating Instructions page 53

Malfunction
Pit jack does not retract
or retracts with great
difficulty
Piston rod does not fully
extend
BA550001-en
Possible cause
Valve / coil defective
Wrong valve
Wrong valve
Hydraulic valve / block
defective (rare)
Mech. Damage to the pit
jack
Seal defective, oil
leakage at the guide
bushing
Too little oil
Air in the system
Remedy
Replace valve / coil
(customer service)
Check type designation
(EMP = prop. Valve)
Check type designation
(EMP = prop. Valve)
See above
Check the piston rod and
guide bush for visible
damage
Loosen the bleed screw
and observe whether the
piston rod lowers. Try to
turn the piston rod. If the
piston rod can be
lowered and rotated,
there is no mech.
Damage before
Customer service
Customer service
Refill oil (HLP-D-22)
See above
53