71
71
lifting oil circuit
lifting oil circuit
Oil
Oil hole
hole is
is blocked
blocked
Disassembly
Disassembly and
and clean
clean
Vibrate and the oil
Vibrate and the oil
pressure rises slowly
pressure rises slowly
Spool
Spool is
is held
held up
up
Disassembly
Disassembly and
and clean
clean
Exhaust
Exhaust is
is inadequate
inadequate
Exhaust
Exhaust fully
fully
The oil pressure of the
The oil pressure of the
steering oil circuit is more
steering oil circuit is more
than the specified value
than the specified value
Spool
Spool is
is held
held up
up
Disassembly
Disassembly and
and clean
clean
Oil
Oil hole
hole is
is blocked
blocked
Disassembly
Disassembly and
and clean
clean
Lower
Lower oil
oil amount
amount
Misadjusted
Misadjusted relief
relief valve
valve
Adjust
Adjust
Noisy control valve
Noisy control valve
Misadjusted
Misadjusted relief
relief valve
valve
Adjust
Adjust
Slide
Slide surface
surface worn
worn
Replace
Replace relief
relief valve
valve
Oil
Oil leakage
leakage (outside)
(outside)
O-ring
O-ring seal
seal broken
broken down
down
Replace
Replace O-ring
O-ring seal
seal
Adjusting pressure low
Adjusting pressure lower
er
Spring
Spring is
is worsen
worsen
Replace
Replace spring
spring
Valve seat surface is
Valve seat surface is
worsen
worsen
Adjust or replace relief
Adjust or replace relief
valve
valve
Oil leakage (inside)
Oil leakage (inside)
Valve seat surface is
Valve seat surface is
worsen
worsen
Correct valve seat surface
Correct valve seat surface
Adjusting pressure h
Adjusting pressure higher
igher
V
Valve is held up
alve is held up
Disassembly and c
Disassembly and clean
lean
(2) Hydraulic oil pump
(2) Hydraulic oil pump
Problem
Problem
Possible
Possible cause
cause
Remedy
Remedy
Oil can not be
Oil can not be
pumped out
pumped out
Lower
Lower oil
oil level
level in
in oil
oil tank
tank
Add
Add oil
oil up
up to
to specified
specified oil
oil level
level
Blocked
Blocked pipe-line
pipe-line or
or oil
oil filter
filter
Clean
Clean or
or replace
replace oil
oil if
if necessary
necessary
Oil pump can not
Oil pump can not
be pressurized
be pressurized
Lining plate broken down
Lining plate broken down
Replace
Replace
Wearing broken down
Wearing broken down
Seal ring, bushing or snap ring
Seal ring, bushing or snap ring
broken down
broken down
Misadjusted relief valve
Misadjusted relief valve
Adjust pressure to speci
Adjust pressure to specified
fied
value
value
Retighten loose connections for
Retighten loose connections for
https://www.besttruckmanuals.com/