1. walking deviation
When the excavator has run off the track, the following checks are made to ensure that the running motor is in normal condition and the track tightness is properly adjusted:
(1) check the center reverse connector.
中心反转接头处油道许多，相互之间简单勾结。先拆开 2 个行走马达的油管，然后堵死其间 1 个马达油管；再发动发动机，拉动堵死油管马达的换向阀，发现油液压力过低，而没有堵死的液压马达的油孔出油。由此断定中心反转接头的油道密封欠好。替换中心反转接头的密封件，毛病不见
There are many oil channels at the center reverse junction, which are simply colluded with each other. First, remove the tubing of two walking motors, and then plug the one motor tubing in between; then start the engine, pull the reversing valve plugging the tubing motor, found that the hydraulic pressure is too low, and no plugged hydraulic motor oil hole oil. It is concluded that the oil seal of the central reverse connection is not good enough. Replace the seal of the center reverse connector. It's not seen.
(2) check the combination valve.
先查看行走速度慢一侧的行走组合阀。拆开其限压阀上的 2 根油管，用堵头堵住出油口，发动发动机，拉动有堵头组合阀的行走操作手柄，检测油压正常；再拆开另一侧行走组合阀上的 2 根油管，再次发动发动机，调查其限压阀的 2 个油孔无油液流出，由此判别毛病不在组合阀。
First look at the walking speed slow side of the combined valve. Remove the two tubing on the pressure limiting valve, plug the outlet with a plug, start the engine, pull the walking handle of the combination valve with a plug to check the normal oil pressure; then remove the two tubing on the other side of the combination valve, start the engine again, investigate the two oil holes of the pressure limiting valve without oil flowing out, thereby distinguishing the hair. The disease is not in the combination valve.
The 2. bucket cylinder is slow and elastic.
The bucket-rod cylinder of the long-arm excavator shows slow elasticity and weakness during its operation. The analysis is made as follows:
(1) check seals.
If the sealing parts of bucket rod cylinder piston and other places fail, the hydraulic oil of low pressure cavity and high pressure cavity will be channeled each other because of internal leakage. First loosen the oil pipe in the low pressure chamber, release the hydraulic oil in the chamber, and then start the engine to write the pressure oil into the high pressure chamber. No hydraulic oil flowed out of the oil pipe in the low pressure chamber, indicating that the piston seal of the bucket rod cylinder is outstanding.
(2) check the safety suction valve.
斗杆油缸作业回路上装有 2 个安全吸油阀，若其间某个安全吸油阀的单向阀失效成为双向直通，或许在溢流阀溢流压力很低时，都会形成该侧油腔的油压不能树立，压力油直接经过单向阀或溢流阀泄入油箱，使斗杆缸动作缓慢无力乃至不能作业。
There are two safety suction valves in the working circuit of the bucket rod cylinder. If one of the safety suction valves fails to be two-way through during the operation, the oil pressure in the side chamber may not be set up when the overflow pressure of the relief valve is very low, and the pressure oil will be discharged directly into the tank through the one-way valve or the overflow valve, thus slowing down the action of the bucket rod cylinder. Unable or even unable to work.
If the safety suction valve has the above problems, the bucket rod cylinder will slow down actively after the operation handle stops at the neutral position. But the bucket cylinder did not find such a representation, indicating that the fault was not in the safety suction valve.
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