possible problems
analysis of reasons
solutions
The carriage cannot
descend
1.binding of the directional control valve plug
2.the directional control valve cannot open the
valve
3.leakage of the gas way leading to the de鄄
scending position of the directional control valve
or shortage of air pressure or malfunction of the
electric control valve circuit
1.refit the plug and clean the filth
2.repair the air leakage parts
3.check and repair the air way and circuit
The carriage de鄄
scend automatically
or too quickly or too
slowly
1.the directional control valve isn't fully shut
2.one-way valve isn't airproof
3.serious inner leakage of the hydraulic cylinder
4.the directional control valve retrieves oil too
slowly or too quickly
1.check and change the oil if it's dirty
2.check, repair and change
3.check and repair the gasket sets or change
the hydraulic cylinder
4.adjust the oil retrieving speed of the direction鄄
al control valve
direc tional control
valve leakage
1尧the oil jam in the hydraulic oil tank
2尧the gasket set wears off
3尧the valve fixed bolt loosens
1尧change the hydraulic oil and clean the plug
2尧change the gasket sets
3尧fasten the bolt
hydraulic cylinder
leakage
1尧oil-proof or gasket set wears away
2尧the scrapes on the surface of oil tank
1尧change the oil-proof or gasket sets
2尧check, repair and change for new ones.
226
OWNER爷S MANUAL
JAC HEAVY DUTY TRUCK
INSTRUCTIONS OF SIDE-DUMP TIPPER
1.Working Principles Graph院
油路
Oil way
气路
Air way
举升缸
Lift cylinder
多路阀
multi-pathway valve 限位阀 limit valve
取力器
power take-off 气控阀 air-control valve
储气筒
air-reserve tank
227