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7.2.5
Full hydraulic steering gears
Troubles & possible causes
Fixing methods
1. Steering operation is heavy
a. Insufficient oil delivery of
hydraulic pump
b. Air bulbs in the hydraulic system
c. The oil viscosity is too much
d. Leakage in the cylinder
2. Oil leakage
a. O-ring seals damaged
b. Bolts and nuts for copper
coupling surfaces got loose
c. Poor welding
3. Steering failure
a. Mistaken mounting position of the
rotor and follow-up shaft
b. Failure of the steel ball check valve
in valve body
4. Fails to steer manually
Check the hydraulic pump and fix up the
troubles if any
Bleed air in the system, check the suction pipe
and fix up the leakage if any
Replace with the specified oil
Replace O-ring seal
Replace with new ones
Tighten the bolts and nuts as required
Re-weld
Bring back to the dealer for repairing
Bring back to the dealer for repairing
Bring back to the dealer for repairing
7.2.6
Hydraulic system
Troubles & possible causes
Fixing methods
1. Insufficient lifting force or lift
system not working
a. Too low the oil level or
improper hydraulic oil being
used
b. Oil strainer clogged
c. Air being sucked into
hydraulic system
d. Oil pump seal ring seriously
worn out and inner leaking
seriously
e. Main control valve seized
f. Main control valve worn out
seriously
g. Safety valve failure
h. Cylinder leaking seriously
i. Leakage at distributor seal rings
2. Implement not lowering
a. Main control valve seized
or the lock valve closed
Add or replace with proper oil to specified level
Wash the strainer
Bleed air in the system and tighten connector or
replace seal ring
Replace the oil pump seal ring
Operate lift control lever several times and shift
the main control valve with a screw driver, if still
seized, disassemble and wash it clean
Replace worn out parts
Readjust or repair safety valve
Replace seal ring or replace the worn out parts if
necessary
Replace seal rings
Please fix up the problem by referring to “Point
1-e”, or screw up the locking valve to the highest
position
Содержание DF254G2-6
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Страница 66: ...66 for dealer ...
Страница 67: ...67 for manufacturer ...