7
The cargo fork frame
is skewed
Pressure difference between left and
right
Air replenishment and air pressure
are consistent
Inconsistent tightness of left and right
chains
The tightness adjustment is
consistent
The oil channel in the speed limiting
valve is blocked
Cleaning and replacement
The oil inlet of the lifting cylinder is
partially blocked
Maintenance and cleaning
The left and right
elevations are not
synchronized
Left and right lifting cylinder stroke is
inconsistent
Use cylinder head 180 degree
adjustment
The height of the left and right cylinders
is inconsistent
Adjusting bolts on the oil cylinder
The left and right cylinder stroke is too
inconsistent to exceed the cylinder head
adjustment range
Add adjusting gasket on lifting
cylinder piston rod
The over lift speed at
full load cannot meet
the requirements
Or fail to lift
Insufficient working oil
Come on
The throttle orifice of the speed limiting
valve was blocked with stolen goods
Unpick and wash
The safety valve is sliding and jammed
Cleaning and repairing
Gas leakage of suction pipe weld at filter
screen in oil tank
Repair welding, bottom leakage
Loose pipe joint
Pry tight
Oil pump gear and pump body
excessive wear, clearance is too large
Check oil cleanliness, grade 9-11
required
The sealing ring in the lifting cylinder is
damaged or overwork and leaks too
much
Replace seal ring
Multi-way valve body and spool valve
gap is too large, the main valve pressure
is too low
Replacement and adjustment
The shunt valve shunt improperly
Adjust the
