Among the more than 10 million tractors in China, small-scale four-wheel tractors account for 60% of the total and are the main agricultural power machinery. In order to improve the use efficiency of small four-wheel tractors, not only must the pilots have skilled driving techniques, but they should also master troubleshooting and maintenance methods. (1) The brake drum is hot. One Dongfanghong-180 small four-wheel tractor, the working time is not long, found that the brake heat hot, empty car uphill, such as overload conditions. After checking, the reason is that the driver has overtightened the brake for safe driving and the free stroke of the brake pedal is 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. After adjusting the length of the brake lever to adjust the free stroke of the pedal to 30mm, the brake will be reliable and the brake drum will no longer generate heat. (2) Steering wheel idle. A Dongfenghong-170 small four-wheel tractor that has been used for many years has found that the steering wheel and the steering wheel cannot operate synchronously during the training of the coach. After achieving a right turn, when turning left or turning back again, the steering wheel idles, the guide wheel is not deflected, and the right turn is flexible and the left turn is sluggish. Upon examination, it was found that the turbine shaft and steering arm of the aircraft were not splined, but instead fixed by a flat key (now the tractors are 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. . The keyway is properly trimmed and enlarged, and the corresponding flat keys are installed to assemble the test vehicle, and the steering returns to normal. (3) The front beam is normal, but the guide wheel accelerates wear. Several small four-wheel tractors have been used for less than one year. The wear of the guide wheels has reached the limit of scrapping, and the guide wheels have wobbled heading during driving. After inspection, the front beam value in the range of 6 ~ 12mm, is a normal value. Further analysis and inspection, found the cause of excessive wear guide wheel: First, the guide axle inner and outer bearings need to check the adjustment gap and add butter after 200 to 300 hours, but most of the drivers did not do so, resulting in excessive bearing clearance The front wheel shook his head. 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. Solution: Replace the new bushing. A copper gasket can be clamped in the bushing according to the size of the gap after the wear. The bushing is periodically filled with oil. After the above-mentioned maintenance, the guide wheel wears normally and the service life is extended to 2 to 3 years. (4) The clutch release bearing is hot or damaged. A belt rotating small four-wheel tractor clutch release bearing is a sealed one-way thrust ball bearing, the design requirements only to withstand a small axial thrust (bearing force of about 260 ~ 320kg 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 heat up, resulting in long-term operation and damage. Adjust as required to maintain normal clearance between the release lever and the release bearing. (5) Causes and elimination of rocking axis roll-out. 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 lock is too thin, deformed during work, and loses 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. (6) Violent "clenching" 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 their necksâ€. If the violent “clench†sound becomes a crash sound, it means that “cut neck†has occurred and the differential and Parts in the gearbox have been severely damaged. When you suddenly hear a "clench" sound while driving, you should stop immediately to prevent "cut neck" malfunction and avoid loss. The overhaul of the differential should be carried out in accordance with the usual steps. Cilastatin Acid,Imipenem Cilastatin,Cilastatin Intermediate,Imipenem Cilastatin Cost Xinxiang Haibin Pharmaceutical Co.,Ltd , https://www.carbapenemspharmacy.com