A 4000-year-old Komatsu excavator has been working normally, but recently there has been a failure that the throttle cannot be added. After our investigation, we finally found that the cab's line was broken and finally solved it. Today we will share the problem that the throttle of the excavator suddenly cannot be added.
Why can't Komatsu excavator add throttle
(1) Check the blockage of the oil passage. First perform routine treatment, remove the oil pipe, remove the main body spool valve body, stem and related parts for cleaning, clean the oil passage and blow dry with compressed air. From the surface phenomenon, it is mostly caused by seal failure, damage, extrusion or the sealing surface is strained. Check whether the cone valve of the general safety valve is stuck; check the clearance between the valve stem and the valve body, the normal clearance should be between 0.005 and 0.025mm, and the repair limit is 0.04mm; Fitting clearance, normal fitting standard clearance is 0.010 ~ 0.018mm, repair limit is 0.03mm.
(2) Grind the two-speed valve to remove the burr, so that the valve core can move freely in the valve body without jamming. First check the side where the walking speed is slow, starting from the combination valve, disassemble the two oil pipes on the pressure limiting valve and block the oil outlet with a plug. There are many oil passages at the center rotary joint, which are easy to communicate with each other. If the hydraulic cylinder crawling phenomenon still exists after a period of use, you should check whether the seals are intact and assembled correctly. In general this is not very easy to get, but I can give you some basic knowledge of digging machine, I hope it is useful to you.
(3) The hydraulic drive system applied to the excavator mainly includes pilot control hydraulic system, slewing hydraulic system, walking hydraulic system, working device hydraulic system, etc. It has the advantages of compact structure, flexible action, smooth operation, convenient operation, etc. The hydraulic system is Using hydraulic oil as the medium to transmit power will cause leakage due to wear of internal components, as well as failures such as overheating and weak work.
The occurrence of hydraulic transmission failure is sudden and concealed, and there are many components involved, which brings certain difficulties to fault diagnosis and elimination. Therefore, when repairing the hydraulic system, you must understand its working principle and correctly analyze the cause of the failure The quality of repairs can only be guaranteed on the basis of At this time, it is only necessary to check the boom spool valve, boom cylinder, boom oil pipe, and their seals.
