5-10t Internal Combustion Counterbalance Forklift Truck Operation & Maintenance Manual
Examine whether or not the system pressure complies with the specified value, when piston of
cylinder reaches the extreme position.
(7)Application Service:
Examine whether or not oil leak exists, and examine the oil level and working status every day.
Replace core of filter and oil liquid regularly according to specification. The condition of
hydraulic oil may be examined by dropping one drip of oil onto the blotting paper, and it
cannot be used any more if there is a black center with oil stain. Causes for anomalies found if
any during use shall be carefully searched for, and it is strictly prohibited for two persons to
turn the steering wheel at the same time.
6.1.4 Examination and Maintenance of Steering Unit
Steering system must be regularly examined, for it to maintain a good working status, and to be
prevented from the occurrence of unexpected accidents.
(1) Regularly examine the water content, mechanical impurity, and acid value of the working
oil. The oil shall be replaced with new one when the original brand specification is exceeded,
and it is absolutely prohibited to use the used and not filtered waste oil.
(2) It is not allowed to take apart the steering unit in a hurry, when steering system is examined,
and the “Notices for Assembly” shall be followed, when it has been confirmed that failure
exists with the steering unit.
(3) All the disassembly appliances used shall be cleanly, the site shall be clean, and it is the
best for disassembly to be performed indoors.
(4) Notices for Assembly:
a. Clean up all the parts using gasoline or coal oil prior to assembly, and the paint if any on the
bonding face shall be wiped up using acetone. It is prohibited to scrub the parts using cotton
yarn or rags, while hair brush or silk cloth shall be used, and the parts may be blown off using
compressed air where there the condition permits. The rubber ring shall never be soaked in
gasoline for a long time. After steering unit has been properly assembled, it is required to add
50-100ml hydraulic oil at the oil inlet port and to turn the valve core leftwards and rightwards
before it is assembled on to the truck. The steering unit can only be loaded for test run if no
anomaly is found.
b. The bonding faces of valve body, separation disc, stator, and rear cover shall be highly clean,
and they can be bruised and scuffed on no account.
c. Pay attention that the screw sleeve must be lover than the plane of valve body.
d. Both retainer ring and slip ring have a beveled side, and the bevel of retainer ring shall face
the front cover, while the bevel for slip ring hole shall face the front valve core.
e. Punch point marks are available on the end faces of both rotor and universal driving shaft,
and the two points shall face each other during assembly.
f. Copper washer or aluminum washer must be used as the washer for limit bolt (with pin).
g. Fastening method for 7 bolts on the rear cover: Screw one bolt for every other two bolts in
sequence, and screw down the bolt gradually instead of in turn, at a tightening torque of
3-40N.m.
h. Pay attention to the “Inlet”, “Return”, “Left”, and “Right” marks for valve body when oil
pipe is installed, and the oil pipes shall be accordingly connected with corresponding oil pipes
one by one.
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