Introduction of bulldozer Classification of bulldozer Selection and purchase of bulldozer operation, maintenance and troubleshooting of bulldozer brand 1 Introduction of bulldozer is a self-propelled construction machine with bulldozer and control mechanism installed in front of crawler tractor or tire tractor, which is mainly used for cutting, road lifting, backfilling, removing obstacles, eliminating hail accumulation, and also for shoveling and stacking short-distance loose materials.
2 Classification of bulldozers (1) Bulldozers can be divided into the following categories according to engine power
1) Small bulldozers with power below 37kv;
2) medium bulldozer: the power is 37-25kw;
3) large bulldozer; The power is above 25kw.
(2) Bulldozing by walking mode can still be divided into the following two types
1) Crawler bulldozer: it has large traction, small grounding specific pressure, strong climbing ability and excellent working performance, and is a multi-purpose model.
2) Tire bulldozer: It has the advantages of fast running speed, good maneuverability, short operation cycle time, convenient and rapid transfer and no damage to the ground, and is especially suitable for urban construction and road maintenance projects.
3 bulldozer purchase 1. Determine the power grade of the machine
When determining the power grade of the bulldozer to be purchased, users should select it according to the project scale and the reasonable application range of the bulldozer power grade (see Table 1).
Table 1 Applicable engineering scope of bulldozers of different grades
Power grade range is suitable for engineering conditions
Large-scale water conservancy and mining projects above 235kW(32 HP)
169kW(22 HP)-235 kW (32 HP) medium-sized highway construction, water conservancy projects and infrastructure construction projects ...
4 bulldozer operation (4). Do not leave your post at work, and do not operate machinery that is inconsistent with the operation certificate. It is strictly forbidden to hand over mechanical equipment to personnel without the operation certificate of this model. It is forbidden to operate after drinking.
2. Before each operation, check whether the lubricating oil, fuel oil and water are sufficient, whether all kinds of instruments are normal, whether the transmission system and working device are in good condition, and there is no leakage in the hydraulic system and pipelines. Only after it is confirmed to be normal can it be started.
3. The operator must strictly implement the inspection system before work and the inspection and maintenance system after work according to the instructions of this machine.
4. The cab or operating room should be kept clean and tidy, and inflammable, explosive and articles are strictly prohibited. It is forbidden to wear slippers, smoke and work after drinking. It is strictly forbidden for machinery to run with faults or overload ...
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Maintenance bulldozer side. Method, if the tension is excessive, the tension of the guide wheel spring acts on the track pin and pin sleeve, and the outer circle of the pin and the inner circle of the pin sleeve are always subjected to high extrusion stress, and the pin and pin sleeve wear prematurely during operation. At the same time, the elastic force of the tension spring of the guide wheel also acts on the guide wheel shaft and sleeve, resulting in great surface contact stress, which makes the guide wheel shaft sleeve easy to grind into a semicircle, and the track pitch is easy to lengthen, which will reduce the mechanical transmission efficiency and waste the power transmitted by the engine to the drive wheel and track.
the second method of maintaining bulldozers-keeping the position of the guide wheel centered
The misalignment of the guide wheel has a serious impact on other parts of the walking mechanism, so adjusting the gap between the guide plate of the guide wheel and the crawler frame is the key point to prolong the life of the walking mechanism. When adjusting, use the gasket between the guide plate and the bearing to correct it. If the gap is large, remove the gasket; The gap is small, and the gasket is added. The standard clearance of bulldozer maintenance method is .5～1.mm, and that of maximum permitted gap is 3.mm.. Turn the track pin and pin sleeve over at an appropriate time.
the third method of maintaining the bulldozer-tighten the bolts and nuts in time
When the bolts of the walking mechanism are loose, they are easy to break or be lost, causing a series of failures. The following bolts should be checked for routine maintenance: mounting bolts for roller and idler, mounting bolts for driving wheel tooth block, mounting bolts for track plate, mounting bolts for roller guard plate and mounting bolts for diagonal brace head. For the tightening torque of main bolts, refer to the instructions of each model.
The fourth method of maintaining bulldozers-timely lubrication
Lubrication of running gear is very important. Many roller bearings are "burned to death" and the expenses are not found in time because of oil leakage. It is generally believed that the following five places are likely to leak oil: due to the poor or damaged O-ring between the retaining ring and the shaft, oil leaks from the outside of the retaining ring and the shaft; Due to poor contact of floating seal ring or O-ring defect, oil leaks from the outer side of retaining ring and roller; Due to the poor O-ring between the roller and the bushing, oil leaks between the bushing and the roller; Oil leaks at the oil filler plug because the oil filler plug is loose or the seat hole sealed by the conical plug is damaged; Due to the poor O-ring, oil leaks between the cover and the roller. Therefore, the above parts should be inspected at ordinary times, and added and replaced regularly according to the lubrication cycle of each part.
6 bulldozer troubleshooting 1. Unable to start
A GJT112 bulldozer has been unable to start during the opening of the hangar.
this machine is equipped with Chongqing Cummins M11-C225 diesel engine. after some inspection, it was ruled out that there was no electricity or oil, and the fuel tank connector was loose or blocked. finally, it was suspected that the PT fuel pump was faulty. Check the AFC air-fuel control device. After the air compressor for the intake pipe is turned on to supply air to the intake pipe, the machine can be started smoothly. If the air supply is stopped, the machine will be turned off immediately. Therefore, it is concluded that the AFC air-fuel control device is faulty.
loosen the fixing nut of AFC fuel control device, turn AFC fuel control device clockwise with an Allen key, and then tighten the fixing nut. When the machine is started again, it can start normally and the fault disappears.
2. Fuel supply system failure
A TY16 bulldozer needs to leave the hangar during a seasonal maintenance, but it can't get on ...
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