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Preparation for work
1) Control system should be centralized in the driving area of upper rotary and satisfy the
man-machine requirements. For example, controllers and driver seat should be designed
according to 160-180 cm for males and 150-170 cm for females.
2) Startup and stop should be steady, with its speed and strength in control. At the same
time, the combine actions should be also in control.
3) Easy, handy and visual operations In general, the operational force on handle does not
exceed 40-60 N and handle travel does not exceed 17cm.
4) Control mechanism should minimize the deformation of its lever, as well as the inside
clearance and the idle travel.
5) Ensure the operational performance does not change in -40-50
℃
.
SERVICE TECHNOLOGIES
Being of high temperature and pressure, the excavator could have the
hydraulic oil temperature as high as 85
℃
the engine silencer temperature as
high as 700
℃
and pressure as high as 16-18MPa. Therefore. the operators
should be specially trained to obtain the proper certificates and to be familiar
with the contents in this manual before the operations. In addition,
maintenance and repair of excavator should be strictly in line with regulations to
avoid any accident.
Schematics of main valve
There are four basic movements: bucket rotation, arm stretching / backing, boom lifting / lowering
and tumtable swinging.
In general, pulling/pushing of hydraulic cylinder and rotation of hydraulic motor is controlled with
three-way axial slide valve through the oil-flow direction and the work speed is controlled by
operator or auxiliary devices according to the quantitative system and the valve openness.
1.1 Basic requirements on control system
Basic requirements on control system include:
1. Inspection before startup
In order to prolong its service span, check the following before startup:
①. Check if there is dirt around or below machine, bolts loosened, any oil leaked and if any
part damaged or worn.
②. Check if all switches, lamps and fuse box could work normally.
③. Check if the work equipment and hydra0.ulic parts could work normally.
④. Check if all engine oil levels and fuel level are proper.
The above should be checked normal: otherwise engine cannot be started up until they are checked
normal after troubleshooting.
