11
REV. 03/2015
3. The vehicle can lift but cannot retain, by turn-
ing the handle, the vehicle can lift, or although
the vehicle can lift, but then automatically
lower?
Cause 1 Valve blocked by debris.
Troubleshooting:
Remove all the parts within the valve,
clean them up and re-install, the fault can
then be fi xed.
Seals need to be replaced when necess-
ary.
1. Valves are precision parts, apart from
the seals, no parts shall be replaced or
swapped between two vehicles, otherwise
may need a technician with certain skills to
fi x!
2. An appropriate amount of hydraulic oil
needs to be refi lled depending on the loss
of hydraulic oil! Warning! DO NOT attempt
this repair operation without proper
training!
4. The vehicle can lift but cannot lower?
Cause 1
Piston rod bent or bonded with cylinder
block.
Cause 2
May be caused by other parts on the
vehicle.
Cause 3
May be caused by the vehicle getting rusty
or blocked by foreign bodies.
Troubleshooting:
Check all the related parts of the entire
vehicle for abnormalities, remove the
foreign objects on other parts, rectify and
replace the damaged or deformed parts.
5. The vehicle cannot lower to bottom?
Cause 1 Excessive hydraulic oil.
Troubleshooting:
Drain the excessive hydraulic oil.
HYDRAULIC SYSTEM
