Causes and Elimination of Several Common Faults of Small Four-wheel Tractor
April 15 09:03:35, 2019
Among the more than 10 million tractors in China, small four-wheel tractors account for 60% of the total and become the main agricultural power machinery. In order to help the farmer to use the small four-wheeler, the following describes some troubleshooting methods. First, the brake drum has abnormal sound. A Dongfanghong-170 small four-wheel tractor, the brake drum made a large debris impact sound when the brakes, the machine immediately parked, after demolition inspection, found that the brake shoe return spring is very soft, brake shoes part Burned, local rivets loosen, and friction plates cracked. The cause of the failure: First, the quality of the rubbing rivets is poor; Second, frequent emergency brakes; Third, the assembly is not clean, the sand mixed. After the new brake shoe is riveted, the return spring is replaced, the brakes are eliminated, and the assembly is properly operated (if the brake is not applied, the foot must not be placed on the brake pedal; try to avoid emergency braking; keep the correct brake; The gap is checked and adjusted regularly. It is used for more than one year. The brakes are good and there is no abnormal noise. Second, the brake drum fever. One Dongfanghong-180 small four-wheel tractor, working time is not long, found that the brake is very hot, the empty car was overloaded on the uphill. The reason for the inspection was that the driver adjusted the brake to death for safety. The free stroke of the brake pedal was almost zero. In this way, not only the engine power is consumed during driving, but also the wear of the brake band is accelerated, causing the brake drum to heat up. We adjusted the brake lever to adjust the pedal free stroke to 30mm. Practice has proved that the brake is reliable and the brake drum no longer generates heat. Third, the steering wheel idle. A Dongfenghong-170 small four-wheel tractor that has been used for many years, during the internship of the coach, we found that the guide wheel and the steering wheel could not operate synchronously. After achieving a right turn, when turning left or turning back again, the steering wheel is idle, the guide wheel is not deflected, and the right turn is flexible and the left turn is very sluggish. After checking many places, it was found that the turbine shaft and the steering arm of the aircraft were not connected by a sea button, but instead fixed by a flat key (the tractors are now all splined). Due to the long use time, the key and the keyway are seriously worn. When the steering wheel rotates under the control of the steering wheel, the steering arm does not oscillate accordingly. Therefore, the steering wheel and the guide wheel cannot reliably transmit the steering force, causing the steering wheel to idle. . We will properly modify and enlarge the keyway, install the corresponding key, and assemble the test vehicle. The steering will return to normal. Fourth, the first front beam is normal, but the guide wheel accelerates wear. In the service to the countryside, we found that several small four-wheel tractors were used for six months to one year. The wear of the guide wheels reached the limit for scrapping, and the guide wheels wobbled during driving. After inspection, the front wheel front beam value is in the range of 6-12mm, which is a normal value; further analysis and inspection found the cause of excessive wear of the guide wheel: First, the guide wheel shaft inner bearing 7306, the outer bearing 7304 is a tapered bearing, use 200 After 300 hours, it is necessary to inspect and adjust the bearing clearance and inject butter, but most of the drivers did not do so, causing the bearing clearance to be too large and the front wheel to wobble. Therefore, during use and assembly, the bearing clearance should be carefully adjusted and oiled. The second reason is that the bracket bushing of the knuckle shaft is heavily worn, the positioning force is reduced, and the front wheel is shook. This is an important reason for the early wear of the front wheel. The solution is: to replace the new bushing, you can also make a copper gasket inside the bushing according to the size of the gap after the wear, and periodically fill the bushing with oil. After the above-mentioned maintenance, the guide wheel wears normally and the service life is extended to 2-3 years. Fifth, the clutch release bearing 588908 heat or damage. A belt rotating small four-wheel tractor clutch release bearing is a sealed one-way thrust ball bearing, the design requires only a small axial thrust (the bearing is approximately 260 ~ 320 kg force when separated), generally does not bear radial force . At work, the separation bearing rotates along with the clutch housing, and after touching it, the bearing is hot to touch. The reason for this is that the clutch does not have a clearance (caused by improper adjustment or after the wear of the clutch has not been adjusted in time), so that the release bearing rotates with the release lever. This will not only affect the normal operation of the clutch, but also cause the separation bearing to generate heat, which will cause damage if the operation time is long. Adjust as required to maintain normal clearance between the release lever and the release bearing. Sixth, the reasons for the roll axis out and eliminate. One Dongfanghong-200 small four-wheel tractor, the swing axle of the front axle suddenly pulled out during the transportation operation, thanks to the timely handling of the hand, avoiding a vicious accident. The reason for this is that the newly-changed rocking shaft positioning locking plate is too thin, deformed during work, and lost its positioning effect. In the inspection of similar faults, we also found that some of the operators used wire windings instead of positioning cleats, which led to the above-mentioned failures and caused the car to crash. Therefore, new locks must be used instead of thin locks or wires. Seventh, violent teething sounds at high speed and low speed. This sound in the gearbox body is a sign that the differential housing and cover are about to “cut neckâ€. If the violent teething sound becomes a crash sound, it means that “cutting neck†has occurred, the differential and the gearbox The internal components have been severely damaged and their losses are heavy. When you suddenly hear a rattling noise in your car, you should stop immediately to prevent the "cut neck" malfunction and avoid loss. The overhaul of the differential should be carried out in accordance with the usual steps.
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