10
10
Multi-way valve
Multi-way valve
Fault
Fault
Possible
Possible cause
cause
Corrective
Corrective measure
measure
Safety valve pressure
Safety valve pressure
erratic or cannot be
erratic or cannot be
adjusted up
adjusted up
Pressure adjusting screw loose
Pressure adjusting screw loose
Readjust pressure and tighten
Readjust pressure and tighten
screw
screw
Pressure adjusting spring distorted
Pressure adjusting spring distorted
or damaged
or damaged
Replace
Replace
Safety valve spool worn or stuck
Safety valve spool worn or stuck
Replace or remove, clean and
Replace or remove, clean and
reassemble
reassemble
Pump
Pump malfunctioning
malfunctioning
Overhaul
Overhaul pump
pump
Lift motor is off, operating
Lift motor is off, operating
the forward/backward tilt
the forward/backward tilt
lever tilts the mast forward
lever tilts the mast forward
Tilt locking valve worn or damaged
Tilt locking valve worn or damaged
Replace the spool and tilt
Replace the spool and tilt
locking valve as an assembly
locking valve as an assembly
Broken
Broken tilt
tilt locking
locking spring
spring
Replace
Replace spring
spring
Tilt
Tilt valve
valve stem
stem O-ring
O-ring damaged
damaged
Replace
Replace O-ring
O-ring
Mast erratic when tilted
Mast erratic when tilted
forward
forward
Tilt relief valve malfunctioning
Tilt relief valve malfunctioning
Replace tilt relief valve
Replace tilt relief valve
assembly
assembly
Forks drop noticeably
Forks drop noticeably
when lift lever is in neutral
when lift lever is in neutral
position
position
Excessive wear clearance between
Excessive wear clearance between
valve body and valve stem
valve body and valve stem
Replace stem according to
Replace stem according to
required clearance
required clearance
V
Valve stem is
alve stem is not centred
not centred
Maintaining valve stem in
Maintaining valve stem in
neutral position
neutral position
Cylinder
Cylinder seals
seals defective
defective
Overhaul
Overhaul cylinder
cylinder
Overload valve worn or stuck with
Overload valve worn or stuck with
dirt
dirt
Replace or flush overload valve
Replace or flush overload valve
Fails to reset
Fails to reset
Damaged
Damaged or
or warped
warped return
return spring
spring
Replace
Replace spring
spring
Dirt
Dirt between
between valve
valve body
body and
and stem
stem
Flush
Flush
Control
Control mechanism
mechanism catching
catching
Adjust
Adjust
Reset parts are not coaxial
Reset parts are not coaxial
Reassemble, maintaining
Reassemble, maintaining
coaxiality
coaxiality
External leakage
External leakage
Defective
Defective O-ring
O-ring
Replace
Replace
Poor oil port connector seal
Poor oil port connector seal
Check fastening and sealing of
Check fastening and sealing of
corresponding parts
corresponding parts
Loose seal plate
Loose seal plate
Clean seal plate and retighten
Clean seal plate and retighten
bolts
bolts
Safety valve lock nut/gasket and
Safety valve lock nut/gasket and
inter-gasket connection bolts loose
inter-gasket connection bolts loose
Fasten
Fasten
Multi-way valve cannot
Multi-way valve cannot
move back and forth
move back and forth
Multi-way valve lever is interfering
Multi-way valve lever is interfering
with the valve movement
with the valve movement
Adjust
Adjust
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