No Steering Failure of Crawler Hydraulic Steering Bulldozer

Jun. 17, 2021

In the process of using bulldozers, due to various reasons, bulldozers are difficult to steer, cannot steer, can steer when cold, cannot steer when hot. After these failure phenomena, the bulldozer should be classified and analyzed according to the time of use and the process of failure to find out the truth, so as to avoid unnecessary disassembly and reduce the internal pollution of the machine. The following Bulldozer Supplier introduces bulldozers and other common fault phenomena and related inspection and elimination knowledge.

Bulldozer in the process of use, the sudden appearance of the two sides of the phenomenon of non-rotation. The relief valve of the oil inlet of the directional control valve assembly can be disassembled. The reason is that the oil is too dirty, the impurities in the oil wear or strain the surface of the relief valve spool and the inner cavity of the valve body, so that the spool is stuck in the position of the oil return port and the oil pressure is lost. Adjust the effect so that the system pressure is less than the standard value. After disassembling the relief valve, inspect the parts and if the damage is not particularly serious, polish the damaged parts with 180 or 240 emery cloth. If the parts are severely damaged, replace them. The oil and fine and coarse filter elements must be cleaned during repair.



Structurally optimized Bulldozers slowly develop the above-mentioned fault phenomena during use, and pressure tests must be performed on one or both sides. The standard value of the working oil pressure of the directional clutch separation is 1.1 to 1.3 mpa. first measure the port of the relief valve. If the pressure reaches the standard value, it means that the oil pump and the relief valve are not malfunctioning. Otherwise, check the oil pump and relief valve. After eliminating the oil pump and relief valve, measure the outlet of the directional control valve. If the pressure does not reach the standard value, it means there is an internal leak. The following places may cause leakage.

One is the S-shaped oil pipe between the directional control valve and the bearing seat. You can open the back cover of the central transmission to keep the oil pipe in working condition and check it directly to find the leakage. Both ends of this oil pipe are sealed with O-rings. The main cause of the oil leak is a damaged O-ring. Replace the O-ring with the same type. Be careful not to damage the O-ring during installation.

Second, the connecting bolt between the connecting plate and the inner barrel is loose and oil leakage occurs. Here, open the steering wheel cover tie rod, adjust the steering wheel cover, so that the steering wheel clutch is in working condition, and the leakage can be found by direct inspection.

If the bolt is loose, the bolt must be removed, separated from the connecting surface of the connecting plate and inner drum and then tightened to remove the sediment, check if the parts are damaged, then repair or replace, and then reinstall according to the standard.

The third is the leakage between the connecting plate and the bearing seat and the dynamic seal between the piston and the inner drum. In checking these two places, the steering wheel cover should be removed and the steering wheel clutch should be checked directly in working condition to find the leakage.

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