SHANDONG CARTER HEAVY INDUSTRY MACHINERY CO., LTD.
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4 Service Technologies of Carter 1.2T Excavators
Being of high temperature and pressure, the Carter 1.2T excavator could have the hydraulic oil temperature as high as
85℃, the engine silencer temperature as high as 700℃ and pressure as high as 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.
4.1 Basic construction knowledge
There are four basic movements: bucket rotation, arm stretching / backing, boom lifting / lowering and turntable
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) 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℃.
4.2 Preparation for work
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 hydraulic 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.
2.Maintenancebeforestartup
Before startup each shift, it is needed to grease the work equipment and the slewing bearing.
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