No Steering Failure of Crawler Hydraulic Steering Bulldozer

Nov. 11, 2020

During the use of the bulldozer, due to various reasons, the bulldozer is difficult to turn, cannot turn, cold cars can turn, hot cars can not turn. After the occurrence of these failure phenomena, according to the use time of the bulldozer and the occurrence process of the failure, the classification analysis should be carried out to check the truth, which can avoid unnecessary disassembly and reduce the internal pollution of the machine. The following Bulldozer Suppliers introduce common fault phenomena such as bulldozers and related knowledge of inspection and elimination.

When the Dozer is in use, it suddenly fails to turn on both sides. The overflow valve at 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 overflow valve core and the inner cavity of the valve body, so that the valve core is stuck in the position where the oil return is turned on, and the oil pressure is lost. The adjustment effect makes the system pressure less than the standard value. After disassembling the overflow valve, check the parts if the damage is not particularly serious, use 180 or 240 emery cloth to grind the damaged parts. If the parts are severely damaged, replace them. The oil and the fine filter element and the coarse filter element must be cleaned while repairing.

The Bulldozer Of Structure Optimized slowly forms the aforementioned failure phenomenon during the use process, and the pressure test must be performed on either one side or both sides. The standard value of the separation working oil pressure of the direction clutch is 1.1~1.3mpa. Measure the port of the overflow valve first. If the pressure reaches the standard value, it means that the oil pump and overflow valve are not malfunctioning. Otherwise, check the oil pump and overflow valve. After excluding the oil pump and the overflow valve, measure the outlet of the directional control valve. If the pressure does not reach the standard value, it means there is internal leakage. The following places can cause leakage:



One is the S-shaped oil pipe between the directional control valve and the bearing seat. The rear cover of the central transmission box can be opened to keep the oil pipe in working condition, and the oil leakage can be found by directly inspecting it. Both ends of this oil pipe are sealed with O-rings. The main cause of oil leakage is that the O-rings are damaged. Replace the O-rings of the same model. Be careful not to damage the O-rings during installation;

The second is that the connecting bolts of the connecting plate and the inner drum are loose and leaking. Here, open the direction cover pull rod to adjust the cover to make the direction clutch in working state, and the leakage can be found by directly inspecting it.

If the bolt is loose, the bolt must be removed and separated from the connecting surface of the connecting plate and the inner drum before tightening in order to remove deposits and check for damaged parts, then repair or replace, and then reinstall according to the standard.

The third is leakage at the dynamic seal between the connecting plate and the bearing seat and between the piston and the inner drum. In the inspection of these two places, the direction cover should be removed, and the leakage can be found by directly inspecting the direction clutch when it is in working condition.

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