徐州徐工随车起重机有限公司
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Crane does not
lift rated
capacity load.
1.
inefficient pump
2.
wrong relief valve settings
3.
worn hydraulic pump seals
1.
replace pump
2.
adjust the valve
3.
replace the pump seals
Boom down
automatically
with load
raised
1.
Worn piston rod seals of
derricking cylinder
2.
balance valve port were
stopped or worn the recover
spring.
1.
replace cylinder seals
2.
clean the balance valve and
replace the spring
Crane can’t
slewing
exactly
1.
Exceed the max gradient of
truck
2.
something in the buffer valve
3.
worn the backstop inside the
gear pole
4.
system without power
1.
Recover the truck in accepted
error
2.
clean or replace the slewing
buffer valve
3.
replace the backstop
4.
check the PTO connector
Joint or
slewing parts
sounds
Lack of lubrication
Greased it at specified intervals
Outrigger leg
cylinder can’t
support the
load
1.
double-valve inefficient
2.
worn the piston rod seals of
leg cylinder
1.Clean or replace valve
2.replce seals
Cylinder leak
oil
1.
Worn the seals
2.
worn the piston seal ring
replace seals
Noise and
fluctuating of
pressure are
big, hydraulic
valve outcry.
1.
Suction hose or suction net are
stopped
2.
the glutinosity of oil is
high
3.
bad seal for suction port and
air is sucked
4.
the parts in the pump were
worn
5.
the system pressure is high
1.
Remove the dirt
2.
replace oil or warm it
3.
replace seals and tightness bolt
4.
replace or maintenance the inner
parts
5.
adjust the system pressure
Clearance jerk
was shown
when winch is
lifting or
falling.
1.The rope is twist or disorder on
winch
2.worn the brake friction or
friction area less than 80%
3.dirt inside the lift motor
4.pump supply oil not enough and
system pressure small
1.The rope is twist or disorder on
winch
2.worn the brake friction or friction
area less than 80%
3.dirt inside the lift motor
4.pump supply oil not enough and
system pressure small
H.00 Maintenance
H.01 Notice before maintenance
•The follows with* must be solved by manufacturer.
•Maintenance jobs must be performed with the truck engine off and the key operate
switch disengaged.
•Before carry out work on the pressure lines, release the pressure first(with the truck
engine off) by operating all the crane control levers in both direction.
