Brush cutters, high branch chain saw, chain saw, lawn mower, the wind fire extinguisher, hedge trimmer is the most commonly used garden tools, farm machinery repair, as the doctors to treat patients, not only to the site where the confirmed failure, should be analyzed malfunction and the impact on other parts; However, to achieve the purpose of diagnostic accuracy, must be familiar with the structure and principles of the locomotive, the previous failure commonness and individuality, to identify the root cause, a thorough repair. Otherwise, small problems often lead to accidents. For two cases:

Example ①: a Dongfanghong -802 caterpillar tractor plowing, harrow job, bash 2,3-speed sliding gear teeth gearbox, check the second shaft front the 27709 bearing clearance, bearing clearance adjusting shims Rural Information Network Copyright smoked, Description 2 27709 bearing wear serious, clear the broken teeth and replace the gears and bearings in the gearbox. Work soon, 2,3 gear sliding gear teeth again beaten hearing. And other local hand has to replace batch of new sliding gear, performance of normal, indicating that the new gear is not quality problems. Finally carried off the disintegration of the gearbox, gearbox axis slightly bent to eat the amount of bending around 2-3 °), can only suspect that the second axis due to bending, the replacement of the second axis, it has been the site did not happen like failure, in this case, the fault is due to two 27709 Phoenix taper roller bearings badly worn, leading to the second shaft axial and radial clearance is too large, resulting in the shaft front end work force point down, in frequent changes in the outside world load , beating the second axis of the front-end meeting or beating the shaft to produce flexible bending and permanent deformation and gear meshing not a normal phenomenon. This shows 27709 bearing wear, and pumping less gasket, if necessary, to replace the 27709 bearing, or bending deformation of the second axis of 2,3-speed sliding gear broke again.

Example (2), a lawn mower with the x6105 diesel engine work, the third cylinder exhaust valve lever broken fall into the cylinder, disturbed the group cylinder head, after repair work is normal. But later appeared valve Rocker arm broken glitches (a six-cylinder more frequency). With the passage of time and the increase of the number of repairs, the machine Feng sweep steam pipe black smoke phenomenon intensified, thought the machine Feng aging, incomplete combustion due to no care. In fact, the machine hand should be aware of the repeated broken valve and pound cylinder phenomena, there must be other lesions not eradicate. Miss the opportunity, the final locomotive once again paralyzed, the situation is the First, the six-cylinder valve Rocker arm broken, the first cylinder valve off, the disturbed cylinder head and piston. Open timing gear cover, timing gear mark on; Check valve timing, the intake and exhaust valves open, the closing time is seriously lagging behind, after several twists and turns, and finally remove the crankshaft pinion truth turned out to be the the pinion crankshaft with at the scroll keys.

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