10
REV. 03/2015
2. The vehicle cannot lift to maximum height?
Cause
It is likely to be insuffi cient hydraulic oil.
Troubleshooting:
Refi ll hydraulic oil.
Different brands of hydraulic oils, and oils
from different vendors cannot be mixed
together! Otherwise may accelerate the
premature deterioration and failure of
hydraulic oil!
Cause 3
Check if the unloading valve stem is
blocked.
Troubleshooting:
Push the unloading valve stem in the
direction of the arrow as shown in the
fi gure, if the stem can automatically reset,
then it indicates that the fault is due to
insufficient commissioning, the fault can
be fi xed through re-commissioning.
If the valve stem can only be pushed
forward, but cannot be pulled backward,
and cannot automatically reset, the stem
seems to be blocked, then the valve stem
and related parts need to be replaced.
Sometimes, by applying lubricants on the
surface of valve stem can also make it
reset.
Cause 4
The hydraulic oil viscosity changes due
to different ambient temperature or long
time storage, as well as alpine region, the
hydraulic oil may freeze or may become
diluted at tropical region, long time use of
hydraulic oil with no replacement can also
lead to qualitative change, thickening or
drying of the oil, and so on.
Troubleshooting:
Needs to replace with new hydraulic oil.
i
HYDRAULIC SYSTEM
