UTILEV UT13PTE - 5 Lifting System; Lifting System Faults and Troubleshooting

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1313
5 5 Lifting Lifting SystemSystem
Fault Fault Possible Possible cause cause RemedyRemedy
Fork carriage andFork carriage and
mast tilt withoutmast tilt without
operator touchingoperator touching
controlscontrols
Excessive wear on tilt cylinder seal rings.Excessive wear on tilt cylinder seal rings.
Replace piston seal rings orReplace piston seal rings or
cylindercylinder
Multi-way valve control valve springMulti-way valve control valve spring
inoperative.inoperative.
ReplaceReplace
Fork carriage liftFork carriage lift
and tilt action stiffand tilt action stiff
Piston seized to cylinder wall or piston rodPiston seized to cylinder wall or piston rod
bent.bent.
Replace damaged partsReplace damaged parts
Excessive Excessive cylinder cylinder fouling. fouling. FlushFlush
Fork liftingFork lifting
movement notmovement not
smoothsmooth
Fork carriage assembly improperly adjustedFork carriage assembly improperly adjusted
Adjust clearance betweenAdjust clearance between
channel guide rail and sidechannel guide rail and side
rollersrollers
Insufficient clearance between rollers andInsufficient clearance between rollers and
mast channel.mast channel.
Adjust roller clearanceAdjust roller clearance
Dirt Dirt stuck stuck between between moving moving parts. parts. Clear Clear foreign foreign bodiesbodies
Insufficient lubrication.Insufficient lubrication.
Smear contact surfaces ofSmear contact surfaces of
guide rail with greaseguide rail with grease
Inner Inner mast mast skewed skewed or or fork fork bent. bent. Repair Repair or or replacereplace
Forks Forks lift lift unevenly unevenly Lifting Lifting chains chains not not adjusted. adjusted. Adjust Adjust chains chains to to same same tensiontension
Lifting rollers doLifting rollers do
not rotatenot rotate
Grease has hardened or rollers are cloggedGrease has hardened or rollers are clogged
with dirt.with dirt.
Clean and lubricate rollersClean and lubricate rollers
Lifting Lifting rollers rollers incorrectly incorrectly adjusted. adjusted. AdjustAdjust
Excessive mastExcessive mast
noisenoise
Insufficient Insufficient lubrication. lubrication. LubricateLubricate
Fork carriage side rollers unevenlyFork carriage side rollers unevenly
adjusted. With the mast tilted, side rolleradjusted. With the mast tilted, side roller
strikes mast channel when descending.strikes mast channel when descending.
Adjust rollers and sideAdjust rollers and side
adjusting shimsadjusting shims
Buffer pad below outer mast does not workBuffer pad below outer mast does not work
(container forklifts).(container forklifts).
Adjust gaskets and rubberAdjust gaskets and rubber
buffer pad so that the pistonbuffer pad so that the piston
rod in the cylinder only touchesrod in the cylinder only touches
the bottom of the cylinder afterthe bottom of the cylinder after
the inner mast contacts thethe inner mast contacts the
buffer pad.buffer pad.
Lifting weak orLifting weak or
cannot liftcannot lift
Wear on oil pump gear and pump bodyWear on oil pump gear and pump body
leading to excessive clearance.leading to excessive clearance.
Replace worn parts or pumpReplace worn parts or pump
Worn seal ring on lift cylinder piston causingWorn seal ring on lift cylinder piston causing
internal leakage.internal leakage.
Replace with Replace with new Ynew Y-ring-ring
Multi-way valve, safety valve springMulti-way valve, safety valve spring
defective.defective.
Replace springReplace spring
Worn multi-way valve lever and valve bodWorn multi-way valve lever and valve bodyy
causing excessive oil leakage.causing excessive oil leakage.
ReplaceReplace
Multi-way valve body leaks oil.Multi-way valve body leaks oil.
After grinding, reassemble andAfter grinding, reassemble and
sequentially tighten screwssequentially tighten screws
Hydraulic line leaks oil.Hydraulic line leaks oil.
Compress coupling nut, checkCompress coupling nut, check
sealing gasket and coupling nutsealing gasket and coupling nut
for damagefor damage
Oil temperature too high, diluted hydraulicOil temperature too high, diluted hydraulic
oil, insufficient flow.oil, insufficient flow.
Change non-compliantChange non-compliant
hydraulic oil or reduce amounthydraulic oil or reduce amount
of oil, check reason for high oilof oil, check reason for high oil
temperaturetemperature
Excessive load weight.Excessive load weight.
Carry out lifting in accordanceCarry out lifting in accordance
with regulationswith regulations
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