Maintenance
7
•
Check the pipe joint and hose
joint
parts and seal parts for oil leakage.
There must be no oil
leakage.
•
Operate the hydraulic pump,
and
check the pump for abnormal vibra-
tion and noise and abnormal
heat-
ing in unload and loaded
states.
Abnormal vibration and
noise and abnormal
heating must not occur.
•
Apply a load onto the hydraulic pump. Then
check the hydraulic pump under load for
discharge and discharge pressure. This
check may be eliminated when any abnor-
mality does not occur in the inspections for
abnormal vibration and noise and abnormal
heating specified above.
Must be within a
standard value
specified by the
manufacturer.
Piping
(hoses,
high-pressure
pipes)
• Check the piping for cracking,
damage, aging, and twist.
Cracking, damage, aging,
and twist must not
occur.
• Check the pipe joint sections for
oil leakage.
There must be no oil
leakage.
• Check the piping for mounting
state, and bolts and nuts for
looseness and falling.
Mounting state must be
appropriate, and bolts and nuts
must not be loosened nor fallen.
• Check for operating condition.
• Operate the cylinder by extending and
retracting several time. Then check
the seal sections for oil leakage.
There must be no oil
leakage.
• Stop the cylinder by applying a
load. Then check the cylinder
for extension amount.
Extension amount must
be within a standard value
specified by the manufacture.
• Check the cylinder tube and the
cylinder rod for dents, cracking,
bend, and scratch.
Any dent, crack bent,
and scratch must not
occur.
• Check the cylinder mounting
pins for wear and damage.
Excessive
wear and
damage
must not occur.
• By moving the spool, check that
the spool is operated smoothly.
• Check that the control valve is
installed appropriately.
Must be installed
appropriately.
•
Apply a load to the control valve, for example,
by operating the hydraulic cylinder. Then
check the control valve for correct operation.
The hydraulic
cylinder
must be operated normally,
and surely
stopped.
• Check the body, piping, and joint
sections for oil leakage.
There must be no oil
leakage.
•
Check that the bed
of
the truck
can
be
raised and lowered
smoothly.
• Check each part for cracks,
deformation, and wear.
There must be no
cracks,
deformation,
or
wear.
• Check the mounting bolts for
looseness and falling.
There must be no looseness
or falling of the bolts.
•
Check the frame to truck bed
mount-
ing pins and dump cylinder mounting
pins for clearance by moving the
bed
of the truck
vertically.
There must be no
excessive play in the
pin sections.
• Check for cracks, deformation,
and corrosion.
There must be no
cracks
or excessive deformation.