The walking mechanism of the small four-wheel tractor is composed of three parts: the front axle, the tire and the frame. Its role is to complete the walking task and support the full weight of the tractor. Its working conditions are rather harsh. If it is used, maintained, or improperly adjusted, its service life will be affected. The value of the walking mechanism of small four-wheel tractors accounts for about 25%~30% of the whole machine. Its life span directly affects the service life and maintenance costs of the whole machine. Let's talk about some suggestions for extending the service life of the traveling mechanism.
First, the correct operation
1, choose a reasonable speed. When driving, choose a reasonable speed based on the conditions of the road surface and the surface. Strictly prevent high-speed sharp turning, loose the clutch to get away, high-speed emergency braking, and sudden acceleration, rushing over the groove to reduce the bumps, vibrations, shocks, and the tire's sideslip or straight slide. Failure to do so will cause early wear and tear on components such as rocking shafts and their bushings, vertical shafts and bushings, front wheel shaft bearings, lower shaft support bearings, and tires. Because of the impact load and strong vibration, it will also cause deformation and fracture of the front axle and front axle support. Therefore, choosing a reasonable speed is an important measure to extend the service life of the tractor.
2, prohibit long-term overload operations. In the operation, the tractor should not be overloaded for a long time, because the small four-wheel tractor will have a large load on the rear part of the vehicle during driving, and will increase the load on the drive wheels after overload. Causes excessive fatigue of the drive wheel, resulting in a fracture between the tire and the frame rim. In addition, due to the increase of the load of the driving wheel, the contact abrasion between the tire and the ground is also increased.
When going uphill and downhill, the front or rear load of the tractor will increase, causing the wear of the front or rear wheels to increase. At the same time, as the front and rear axles and the frame increase the wear of the front and rear axle parts due to the impact load, they shorten their Service life.
3, tractors in the middle of the road to rely on. Highways are generally high in the middle and low in both sides. According to China's traffic regulations, motor vehicles are driven on the right side of the road, so that the entire car has more time to focus on the right side. As a result, parts of the right wheel and the right side running mechanism wear more severely than the left side. Therefore, when used in addition to the regular use of the left and right parts can be used in exchange, while driving the tractor should also be in the case of non-compliance, try to walk in the middle of the road to prevent the right wheel and other parts wear excessive.
Second, careful maintenance and timely adjustment
1, to ensure that the tire calibration pressure. Tyres in use should be inflated as standard. Excessive pressure will cause the tractor to vibrate violently and damage the components of the running gear, and even cause the inner tube to burst. If the air pressure is too low, the contact area between the tread and the ground will be increased, so that the friction loss will be increased, the tread wear will be increased, and the tire may even be fatigued and broken.
2, regularly add grease. The relative movement parts of the walking mechanism should be filled with grease in time and regularly cleaned to ensure good lubrication conditions and prevent early wear. When refueling, prevent grease from contaminating the tread and causing corrosion and aging damage.
3, the front axle bearing clearance should be appropriate. Small four-wheel tractor front axle bearing clearance should be guaranteed between 0.1 ~ 0.2mm (the front axle bearing clearance adjustment screw cap screwed to the end, and then adjust the nut back 1/12 ~ 1/6 turn). If the clearance is too large, the front wheel swing will occur during driving, which will increase the wear of the front and front axle bearings and the vertical shaft and bushing. If the clearance is too small, it will cause the front wheel to roll and cause the card to cause the front wheel and the front axle bearing to wear badly, even make the bearing broken.
4, the front wheel before the beam should be appropriate. The front wheel of the front wheel of the small four-wheel tractor should have a value of 6~12mm. If the front wheel is too big or too small, the wear of the front wheel will increase. At the same time, due to the increase of the lateral impact force of the ground wheel on the front wheel, the early wear of the vertical shaft and the bushing and the front wheel shaft bearing is caused, so that the fitting clearance increases, causing the front wheel to swing, which aggravates the tire wear.
5, adjust the steering wheel free travel. The free travel of the steering wheel should be kept in the range of 15o-30o. If it is too large, it will directly affect the control sensitivity of the tractor's driving direction. In this way, under the influence of inertia force and centrifugal force, the tire will be unilaterally overloaded, accelerate the wear of the front wheel axle bearing, the vertical shaft and the bushing, and cause the tire and the rim to be damaged by the lateral force. Therefore, it was found that the free travel of the steering wheel is too large and should be adjusted correctly.
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