8.8.3838 HyHydrdrauaulilic sc sysysttem / em / DiDiagagnonosisis as and nd trtrououblble se shohoototiing ng / S/ Symymptptom om anand Ad Actctiionon
Diagnosis and trouble shootingDiagnosis and trouble shooting
Symptom and ActionSymptom and Action
A number of fault symtoms have been listing in the table below with a A number of fault symtoms have been listing in the table below with a number of possiblenumber of possible
faults and repair procedures. It is therefore faults and repair procedures. It is therefore possible that other faults not listed can occur.possible that other faults not listed can occur.
Table 8.5Table 8.5
SSyymmppttoomm PPoossssiibblle e ffaauulltt AAccttiioonn
The lift motor runs butThe lift motor runs but
the fork carriage doesthe fork carriage does
not lift.not lift.
The lowering valve hasThe lowering valve has
jammed and is open.jammed and is open.
1.1. ClClosose the the ve valalvve.e.
2.2. AdjuAdjust, or st, or remoremove anve any diy dirt in rt in thethe
valve.valve.
The lift motor runs butThe lift motor runs but
the fork carriage liftsthe fork carriage lifts
very slowly.very slowly.
ThThe me machachine ine is is ovoverlerloadoaded.ed. LiLightghten en ththe le loaoad.d.
The overflow valve isThe overflow valve is
defective.defective.
Adjust the valve to the rated weight.Adjust the valve to the rated weight.
An object has partiallyAn object has partially
blocked hoses, hydraulicblocked hoses, hydraulic
pipes or valves.pipes or valves.
Dismantle and clean.Dismantle and clean.
A hydraulic hose has beenA hydraulic hose has been
clenched.clenched.
Rearrange the hose and clamp itRearrange the hose and clamp it
secure.secure.
The lift motor emits aThe lift motor emits a
screeching noise justscreeching noise just
before the fork carriagebefore the fork carriage
reaches the top.reaches the top.
The oil level is too low in theThe oil level is too low in the
hydraulic tank.hydraulic tank.
1.1. FilFill up l up with with hydhydraulraulic oic oil.il.
When the tank is almost full, tryWhen the tank is almost full, try
with 0.1 litre at a time to avoidwith 0.1 litre at a time to avoid
overfilling.overfilling.
2.2. FinFind oud out tht the rease reason fon for tor the lohe loww
level, and rectify the fault.level, and rectify the fault.
The fork carriageThe fork carriage
cannot be lowered.cannot be lowered.
VValve does alve does not open onnot open on
return because of object inreturn because of object in
the system.the system.
Dismantle the valve and clean.Dismantle the valve and clean.
The hose rupture valve isThe hose rupture valve is
closed because the loweringclosed because the lowering
speed is too high.speed is too high.
Limit the lowering speed.Limit the lowering speed.
The hose rupture valve isThe hose rupture valve is
closed because the spring inclosed because the spring in
the valve is defective.the valve is defective.
Replace the hose rupture valve.Replace the hose rupture valve.
The fork carriageThe fork carriage
lowers too lowers too slowly.slowly.
The lowering valve orThe lowering valve or
lowering brake valve is dirtylowering brake valve is dirty
or defective.or defective.
1.1. Run tRun the mohe motor at ftor at full poull power fower for 1r 1
minute to see if the dirt isminute to see if the dirt is
released.released.
2.2. If noIf not, dt, dismanismantle tle the the valvvalve ane andd
clean it, or alternatively replaceclean it, or alternatively replace
defective parts.defective parts.
The oil filter is blocked andThe oil filter is blocked and
dirtydirty
Replace filter.Replace filter.
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