Bulldozers transmission - transmission failure

hydraulic tractors and bulldozers was mainly the oil temperature is too high, easy and automatic de-block Guadang, percussive sound. Usually caused by high oil temperature in the transmission oil level is too low, poor lubrication, sometimes bearing load is too large or too tight installation, check the oil level is appropriate, whether the bearing parts of the local temperature is too high, adjust the bearing clearance; Guadang and easy Auto off the block more because gear tooth surface spalling or spline grooves worn appearance, difficulty moving gear, the gap is too large, pin wear, the spring force is too weak, when shifting gear is not fully engage and lock the axle rod adjustment is not correct, etc. , you should check the lock lever on vehicles distance is appropriate, should be renewed insufficient spring force member; there are usually caused by percussion tooth wear, teeth gap is too large or splined Songkuang etc., should be asked to inspect the parts technology area of ​​wear and mating surfaces, so that the transmission after reinstalling the xsound evenly.

Bulldozer Transmission - Steering clutch failure

Steering clutch failure Primarily, skid, steering failure, when the foot pedal is depressed beating. Journal seal wear and damage, lubricants penetrate inside the clutch and turn the main contamination, driven plate and brake band make 100horsepower swamp dozer available gasoline to clean lining of the oil, adjust the brake band out of round, flat file or car contact surface; steering wheel concentric inner clutch outer teeth and the connecting parts of the ultra-poor, causing the foot pedal is depressed when the beating, should be adjusted to the center of the circle degree, it is not greater than 0.4mm.

Bulldozers Transmission - wheels failure

The Hydrostatic truck Bulldozer main fault of the drive wheel, the bearing is damaged, loose screw gearbox, oil seal leak. Bending axle, the deviation of the shaft hole, and the degree of deformation of the end portion of the rear bearing housing can be checked, repaired to reach the technical standards; centering screws secure the bearing hole and the cover hole; reaming dowel hole, reconstituted locating pin; check seals freedom compression height is 8 ~ 10mm; with sandpaper or rasp Shuhei seal the ends, polished guard oil board, its roughness is not greater than 0.5mm; reassembly, replace seals.

How to fix three bulldozers along?

Three bulldozers area belong consumable parts, according to its design and construction conditions the use of life there is a certain number of years, often much lower than the normal life or overhaul life high driven bulldozerother components. For large-scale imports of three small crawler bulldozer area, the use of a newer approach to the old abandoned due to more expensive, maintenance costs too much, and the residual value of the old parts are also being wasted; if they can adopt reasonable repair method, you can greatly Update reduce costs, and to ensure their life, but also much more cost-effective than the use of non-original parts imported or domestic parts in performance price. Caterpillar Farming Crawler Bulldozer below three area repair technology, equipment and effects briefly described as follows:
A repair method and process
Three rounds in the vicinity of wear mainly refers crawler track surface between each wheel housings and rolling and sliding sleeve and drive pin crawler between teeth wear. Analysis shows that when the surface of the wear limit is reached, due to the internal shaft parts in a sealed lubrication, yet most of the failure. At this point, if they can carry out welding repair its worn surface, to restore the original size, you can extend the life of three rounds in the vicinity.
Welding repair ago, the first of the worn surface rust treatment; and then warmed preheated to about 250T, to eliminate these artifacts in use due to rolling. Internal stresses generated by the impact; then with a soft wire bottoming 105B (increase weld strength), general welding 2-3 layers, other dimensions filled with 104 wire. In the weld repair process should select the welding current and wire feed speed according to the size of the wheels and caterpillar thickness, in order to ensure the quality of welding repair and appearance. Workpiece after welding requires incubation (especially in winter), but need not be subjected to surface treatment (due to the choice of solder is very close to the original performance and can achieve the surface hardness of the original).
It is worth mentioning that the wear limit for the amount of wear is not 70% or more than 120% of the area of ​​three, not advocate the use of welding methods to repair, because the workpiece is either a surface-hardened layer is not completely worn away, either shape and other phenomena, welding success rate decreases.
For like wheels, chain links along the circumferential surface of the worn parts, welding methods can be used to repair; and for like caterpillar pin sets this fan-shaped area in less than 180º locally worn parts can be taken to make the process turn sets reuse. Since in most cases, the pin sleeve always wear faster than the external link wear rate (both wear ratio of about 2: 1), especially when the pin sleeve wear limit is reached, the hardened layer has finished grinding, and then continue to use the wear rate will accelerate, and the remaining service life is very short, then the likelihood of oily type of caterpillar increase oil loss, increased chance to say pin wear. Therefore, when it approaches the wear limit promptly turned around and pin set, replace the seals and grease, you can extend the life of the pins set to double, allowing more efficient use of surplus value chain links and pins.
2, the main repair equipment
Tracked face major repair equipment and surfacing machines and three tracked changer, can wear welding surface to restore the original size and welding repair or disassembly is required caterpillar turned pin sets to achieve track shoe disassembly mechanization. These devices high degree of automation, reliability, enabling batch repair. Currently, Beijing, Guangzhou, Jiangsu, Shanxi, Inner Mongolia and other places are from the United States or Japan, the introduction of these devices, users can conveniently serviced.
3, the quality and effectiveness analysis
After repair welding, turning three sets and other craft repair area, its service life can reach 80% -90% of new products, the average repair cost is only about 30% of new products, repair cycle is shorter than the import of new cycle. Therefore, when just at or slightly exceed the wear limit of three area repair, after all, a good way to update.

hydraulic drive system bulldozers

Chinese bulldozer

Must do the proper operation and regular maintenance work.

  1. To make the correct month clutch. When using clutch engagement to smooth, slow, faster separation. Meng Meng can not be used from close approaches to overcome the load. Can not be combined with a half away from the half-way slow down, slip slope, otherwise it will cause early wear of the clutch.

  2. To avoid dozing or unilateral bulldozing steering even when overloaded steering at full load, or unilateral bulldozing will make steering clutch slip, causing unilateral wear. Do not sharp turns, do not overload the job, otherwise it would be tracked skid and cause abnormal wear.

  3. Do not speed operation. High-speed operation will produce severe turbulence. Walk part so mechanical collision cause damage.

  4. Try to take the rough roads. Even if the road is not smooth the path of two cases have good visual crawler, so try to level the bulldozer Rose exercise, reducing bumps and shocks, thereby reducing mechanical damage to the walking part.

  5. regular checks and maintenance.

  (1) Because the job is often the forward and back, easy to make the center a large bevel gear transmission shaking off the bolt analysis, and therefore often to check and tighten the gear meshing.

  (2) Check the tightness on both sides of the crawler, timely adjustment nut tightness that bilateral agreement crawler tightness.

  (3) Check the travel section of each unit nut is loose. Symmetrical pieces can walk part of the change sides use.

  (4) Check the guide wheel, supporting Taiwan wheel seal is leaking and timely repair.

Bridge box after box bulldozer easy to produce cattle major defect types are: Weld incomplete penetration, lack of fusion, weld and weld cracks and other defects; castings cracks, holes through sex, shrinkage and other casting defects; left and right shell precursors of welding parts welding Gading shape and positioning size tolerance, influence and fusion weld. For the following reasons:
  1. Multi-axle box parts, structure and distribution of the weld is more complex, a small space inside the box, welding operation is difficult. As in the outer shell off the floor with Deng drogue site, due to space is too small, the outside bottom of the left and right of the housing connections, unable welding and welding.
Bulldozers rear axle box
  2. screw plate after plate with the left and right casing joints small space, dead and more difficult the larger the welding operation, could easily lead to incomplete fusion welding.
  3. After the board and external connector shell off the corner weld bead easy off, easy to cause incomplete fusion welding.
  4. When the board is connected with the case for unilateral V-shaped internal weld seam, welding slope up poor, could easily lead to poor weld fusion.
  5. dirty bulldozer parts welding parts of the surface residual rust stains, oil, paint and chemical composition of steel blanks failed, causing pores, cracks and other welding defects.
  6. weld seam produced by incomplete fusion, weld, cracks and other defects in the structure of a water leak testing process plants generally easier to be found, and the ability to timely repair welding. But microcracks and small holes and other defects, due to the low pressure of a water leak test method, the leakage site in a relatively short period of time is not easy to be found. Bulldozer parts finishing.

Bulldozer is a simple structure of self-propelled shovel transport machinery. It has a flexible operation, extensive easy to use, application, adaptable and other advantages. Bulldozers are designed in the past, mainly used in construction, mining, road transportation, national defense construction and other construction, can be spread compression and leveling the ground, filling trenches, the accumulation of dirt, gravel and other loose material number operations. Now bulldozers have been used for water conservancy construction.

  Agricultural tractors, are mounted in front of the farm tractor dozer and enhance control mechanism, a tractor with a power shovel cut and pushing soil, gravel and so on. It is mainly used for agricultural engineering land formation, terracing, land reclamation, land reclamation, trenching dig trenches, accumulated dirt and paving and other operations. Strong adaptability of its terrain, you can work on the cross slope 15 ° -20 ° slope; dozer placed in front of the tractor, dozer direction consistent with the tractor forward direction, when the job is open on their own, in potholes or uneven ground Set launder more irregular mountain ravines dozing, still full operating performance, economic haul distance of 20-30 meters, a significant decline in productivity when more than 50 meters.

  Therefore, the process is one of the most important agricultural earthwork construction work tools. Bulldozer drawback is that the deposited amount before the dozer can not be too small economical transportation distance.

  Bulldozer economic haul tractor power size varies with the commonly used dozer economic haul: Large (200 hp) of 50-70 meters, medium (50-100 hp) of 20-30 meters, a small (50 hp ) 10-20 m. If the transport distance over 80 meters, you should use other earth-moving machinery (such as scrapers, etc.) to carry out.

  Our project began production in the early 1950s with a bulldozer. Currently, the project has been developed with a bulldozer to two dozen, they are equipped with power more than 100 horsepower, with crawler majority. Four wheel drive and marshes dedicated bulldozers, underwater bulldozers also began production.

  Our agricultural bulldozer began production in the early sixties, the larger are transplanted from construction machinery, small bulldozer with existing crawler or wheeled tractors for power and self-supporting design made Mi device. At present, agricultural bulldozer minimum power of 20 hp and a maximum power of 160 horsepower.

  Arrangements for agricultural production around the country for more than ten kinds of models bulldozer and are further expanding varieties, models and improve operational performance. In recent years, people around the self-reliance, big way agricultural mechanization, agricultural tractors doubled, increasing the range of mechanical work. In order to achieve mechanized farmland capital construction, not only dedicated agricultural bulldozer gradually increased, and in the provinces unified arrangement of crawler tractors gradually configured single cylinder, twin hydraulic dozer device. Currently, the bulldozer has played a major role in agricultural production.