Kobelco small dug real fault maintenance case, your Kobelco small dug in the operation have encountered the phenomenon of the small arm hairpin? Does this phenomenon still exist? Do not think this is a small problem. The problem appears, the problem is very important. The problem is solved immediately, act like the wind, this is the maintenance master of the demeanor, the following is Jane Single analysis of Kobelco 70UR-3 small dig small arm card, do not drop off the arm.
Model: Kobelco 70UR-3 (abduction arm)
Date of production: unknown (imported machine only, around 05)
Working hours: 10000+
Fault phenomenon: when the equipment is in construction, suddenly the small arm is stuck in one position and can not move.
Kobelco small dig small arm hairpin, do not drop arm solution:
1. to observe the scene first, the car checked the dashboard, found that no trouble code appeared, and initially eliminated the circuit fault.
The 2. operation on the left hand handle makes the small arm recovery and extension. It is found that the size of the small arm oil cylinder with the handle of the handle does not respond. The sound is also changed (with the load, the distributor valve core moving) and the overflow pressure is normal.
3. check that there is no foreign body such as oil seal or iron filings in the filter element of the hydraulic oil return tank.
4. the spool of the dismantling distributor has a spool in the dead state. After taking out, it is found that there is an iron sheet card that can not be moved between the distributor and the stem. After removing the OK, the fault is eliminated.
5. after installation, the test found that the small arm was free, but another malfunction appeared, and the small arm fell into the cylinder.
6. continue to check the small arm holding valve, find the inner valve core spring move out, can not push the valve spool in the closed state. Reinstall, after the adjustment in place the test car troubleshooting.
Summary: Kobelco 70UR-3 small excavated hydraulic system has foreign objects, specific sources are not clear, the construction site is more anxious to catch up the work period, can not completely find the source of pollution, can only continue to use observation!
