Left turn when the hydrostatically driven crawler tractor is working properly, then turn right and sometimes not normal when normal; brake (in place of a steering rod pull brake linkage), the engine black smoke, variable sound; when to be machine repair, right steering clutch is not completely separated .
Failure Analysis and Troubleshooting: According to the above symptoms, according to the principles of the easier issues first, check the brake on the right, left-right axis hydraulic transmission fluid amount, joystick clearance adjustment, the main valve and turning the steering valve, the results were normal. Then again steering system for leaks, oil spills were examined, about the upcoming brake cover small cap were open, and then squatting ripper shelves were observed walking; when the results of the pull rod right turn, brake cover Big oil has obvious sound. Open central transmission cover, respectively, shaking hands left and right S tube (steering clutch inlet pipe), the feeling on both sides of the gap S activity is almost the same tube, and then were pulled left and right steering rod, see the left and right steering system not to return to the oil central transmission housing difference, so you can exclude leak, spill situation pipeline system exists. To further clarify the source of the sound of Big Oil and steering clutch work, has removed the diesel tank, right brake cover, brake wheel cylinders, brake inlet pipe to the right port on the cabinets (try to prevent oil outflow) , start engine, found from the junction with the central bearing disk drive connected to the oil when you pull out a large number of State and right steering rod. At this point, we make the following judgment on the cause of the malfunction: here is due to the sealing ring is damaged, causing hydraulic oil through the S tube into the right bearing.
However, when hanging under the cab, carried out the right steering clutch, pull the connecting plate and found two sealing ring is not damaged, and the bearing and the central rotating disk bearings are also not damaged, we had to make the right turn clutch assembly Decomposition check, only to find that there are two large springs have been broken, but no damage to the piston and the groove. Replacing the two large springs (symmetrical use), after the piston rings and seal rings, the right steering member refitted test machine, results when releasing the brake, barely able to separate right turn, only slightly better than the previous repair, but still does not work, indicating that the main reason for the failure persists. Identified based on the principle of exclusion, the problem only lies in the steering control valve inside the. Thus, the steering control valve fully decomposed, inspection, and finally found the right reel in the decomposition, loose thread on the pump, causing the spring pressure is reduced. After the re-adjustment of the spring pressure, refitted steering valve test machine again, the fault has been rectified.
