Troubleshooting
Failure Cause Removal
Fork unable to
reach the
maximum height
•
Lack of
hydraulic oil
•
Add oil.
Fork unable to be
lifted.
•
No hydraulic oil
•
Oil containing
impurities
•
Nut (B) being
set too high and
keeping the
pump valve
open.
•
Air in the
hydraulic oil
•
Add oil.
•
Change oil.
•
Set the nut (B).
•
Release air.
Fork unable to be
lowered
•
Lift piston or
pump body
deformation due
to unbalanced
load or
overloading.
•
Fork being kept
in a high
position for too
long, causing
the piston rod to
get exposed and
corrode. Piston
rod may get fully
corroded.
•
Set nut (B) not
in the right
position
•
Change the lift
piston or pump
body.
•
When the truck
is not being
used, keep the
fork in the
lowest position
and lubricate the
rod frequently.
•
Set the nut (B).
Fork unable to be
fully lowered
•
Nut not being
tightly fitted to
the rod
•
Tighten the nut.
Insufficient
tightness
•
Sealing worn
out or damaged
•
Small gaps or
cracks in parts
of the hydraulic
system
•
Change the
sealing.
•
Check and
change the
worn out parts.
Fork lowering
without discharge
valve being
involved
•
Impurities in oil
as the discharge
valve is not
properly tight
•
Small gaps or
cracks in parts
of the hydraulic
system
•
Air in oil
•
Sealing worn
out or damaged
•
Set nut (B) not
in the right
position
•
Change oil.
•
Check and
change the worn
out parts.
•
Release air.
•
Change sealing.
•
Set the nut (B).
Maintenance and care
Oil
•
Check the oil level every 6 months.
Hydraulic or engine oil can be used.
At 40°, viscosity (viscidity) should be
30 cst; total volume of app. 0.3 l.
Air releasing
•
Air could have entered the hydraulic
oil during transport or when pumping
in an inclined position. This could
have caused the fork not to lift any
more when pumping in the LIFT
position. Air can be released as
follows: Keep the functional lever in
the LOWER position and move the
drawbar up and down several times.
Daily inspection
and maintenance
•
Everyday inspection of the forklift
truck minimises wear. Special
attention should be paid to wheels
and axles to ensure they are not
blocked. After finishing work, the
forklift truck should be put out of
operation with no load and the fork
being in the lowest position.
Lubrication
•
Use engine oil or lubricant grease to
lubricate all moving parts.
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