UTILEV UT13PTE, Service Manual

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13 13
5 5 Lifting Lifting System System
Fault Fault Possible Possible cause cause Remedy Remedy
Fork carriage and Fork carriage and
mast tilt without
mast tilt without
operator touching
operator touching
controls
controls
Excessive wear on tilt cylinder seal rings. Excessive wear on tilt cylinder seal rings.
Replace piston seal rings or Replace piston seal rings or
cylinder
cylinder
Multi-way valve control valve spring Multi-way valve control valve spring
inoperative.
inoperative.
Replace Replace
Fork carriage lift Fork carriage lift
and tilt action stiff
and tilt action stiff
Piston seized to cylinder wall or piston rod Piston seized to cylinder wall or piston rod
bent. bent.
Replace damaged parts Replace damaged parts
Excessive Excessive cylinder cylinder fouling. fouling. Flush Flush
Fork lifting Fork lifting
movement not
movement not
smooth
smooth
Fork carriage assembly improperly adjusted Fork carriage assembly improperly adjusted
Adjust clearance between Adjust clearance between
channel guide rail and side channel guide rail and side
rollers
rollers
Insufficient clearance between rollers and Insufficient 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 bodies bodies
Insufficient lubrication. Insufficient lubrication.
Smear contact surfaces of Smear contact surfaces of
guide rail with grease
guide rail with grease
Inner Inner mast mast skewed skewed or or fork fork bent. bent. Repair Repair or or replace replace
Forks Forks lift lift unevenly unevenly Lifting Lifting chains chains not not adjusted. adjusted. Adjust Adjust chains chains to to same same tension tension
Lifting rollers do Lifting rollers do
not rotate
not rotate
Grease has hardened or rollers are clogged Grease has hardened or rollers are clogged
with dirt.
with dirt.
Clean and lubricate rollers Clean and lubricate rollers
Lifting Lifting rollers rollers incorrectly incorrectly adjusted. adjusted. Adjust Adjust
Excessive mast Excessive mast
noise
noise
Insufficient Insufficient lubrication. lubrication. Lubricate Lubricate
Fork carriage side rollers unevenly Fork carriage side rollers unevenly
adjusted. With the mast tilted, side roller
adjusted. 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 shims adjusting shims
Buffer pad below outer mast does not work Buffer pad below outer mast does not work
(container forklifts).
(container forklifts).
Adjust gaskets and rubber Adjust gaskets and rubber
buffer pad so that the piston buffer pad so that the piston
rod in the cylinder only touches
rod in the cylinder only touches
the bottom of the cylinder after
the bottom of the cylinder after
the inner mast contacts the
the inner mast contacts the
buffer pad.
buffer pad.
Lifting weak or Lifting weak or
cannot lift
cannot lift
Wear on oil pump gear and pump body Wear on oil pump gear and pump body
leading to excessive clearance.
leading to excessive clearance.
Replace worn parts or pump Replace worn parts or pump
Worn seal ring on lift cylinder piston causing Worn seal ring on lift cylinder piston causing
internal leakage.
internal leakage.
Replace with Replace with new Y new Y-ring -ring
Multi-way valve, safety valve spring Multi-way valve, safety valve spring
defective.
defective.
Replace spring Replace spring
Worn multi-way valve lever and valve bod Worn multi-way valve lever and valve body y
causing excessive oil leakage. causing excessive oil leakage.
Replace Replace
Multi-way valve body leaks oil. Multi-way valve body leaks oil.
After grinding, reassemble and After grinding, reassemble and
sequentially tighten screws sequentially tighten screws
Hydraulic line leaks oil. Hydraulic line leaks oil.
Compress coupling nut, check Compress coupling nut, check
sealing gasket and coupling nut
sealing gasket and coupling nut
for damage
for damage
Oil temperature too high, diluted hydraulic Oil temperature too high, diluted hydraulic
oil, insufficient flow.
oil, insufficient flow.
Change non-compliant Change non-compliant
hydraulic oil or reduce amount
hydraulic oil or reduce amount
of oil, check reason for high oil
of oil, check reason for high oil
temperature
temperature
Excessive load weight. Excessive load weight.
Carry out lifting in accordance Carry out lifting in accordance
with regulations
with regulations
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