Farmers in the process of using agricultural machinery, there will always be the replacement of spare parts. But how to assemble the parts of farm machinery? What are the precautions? Here is a small introduction. Agricultural machinery parts assembly points and precautions   

1, with chamfered parts   

① valve guide: the chamfered end should be installed into the cylinder head intake and exhaust holes, to the valve head, so as to reduce airflow resistance. The installation is reversed, the intake and exhaust cross-sectional area is reduced, the intake and exhaust resistance increases, the diesel engine conditions deteriorate.

② Oil pump outer rotor: the outer rotor should have a chamfered end toward the shell. Installed in reverse, will affect the oil supply pressure and oil supply volume of the oil pump.

③Drive gear: The end of the drive gear with 30° chamfer should be machined towards the drive wheel side, and the reverse will cause early damage to the 207 bearing.   

2, bearings, bushings agricultural vehicles, tractors, diesel engines with most of the bushings processed with small holes, its role is to guide the oil injected into the shaft and the moving parts of the bushings. Bushing with small holes such as: starter shaft bushing, rocker arm bushing, main shaft tile, etc., the corresponding seat body also has small holes and channels, should be aligned with each other when installed. If the corresponding parts do not involve holes or channels, such as the separation claw, should make the small hole facing upward, in order to facilitate oil injection. Bearings with dust cover, such as clutch 60204, 60206 bearings, etc., have a sealing sheet side should be towards the driven disk, to prevent grease fleeing into slippage.   

3, shaft, shaft seat Some shafts and shaft seat seem not to discern the direction, such as governor gear shaft, rocker arm shaft seat, etc., in fact, should be installed in the direction. The governor gear shaft without small hole end should be pressed into the body, the outer end of the two small holes down, so that the oil splashed into the small hole of the governor gear shaft through the inner hole into the gear bushing. Rocker arm shaft seat installation, there is a seam side down, avoid valve push rod rubbing the guide hole of the cylinder head.   

4、cylinder liner, pressure plate, from the power plate   

①cylinder gasket: cylinder gasket has a wrapped side towards the cylinder head, can enhance the sealing, director of service life.

② injector pressure plate: flat side facing outward, using the leverage principle of the beveled side, balance the pressure of the screwed mother, while preventing one end of the nut, bolt loose and air leakage.

③Follower plate: There are tabs in the middle of the clutch follower plate, and the two tabs should be installed backward, that is, toward the middle pressure plate, in order to prevent incomplete separation.   

5, steering transverse tie rod joint The right steering tie rod joint with a left threaded bore should be installed on the right side of the tractor (forward direction), to ensure that the total assembly after the need to adjust the front beam. Agricultural machinery parts assembly points and precautions   

6, hand tractor gearbox fork shaft three positioning slots in the middle of the fast gear fork shaft, should be installed in the front of the gearbox fork shaft hole, positioning slot spacing between the larger end towards the right side of the box. The slow gear fork shaft and the secondary gear fork shaft both have three positioning slots at one end of the shaft, but they have different positioning slot spacing. The slow gear fork shaft has a small pitch and is installed in the fork shaft hole in the middle of the box, and the positioning slot is close to the right side of the box; the positioning slot of the vice shift fork shaft has a slightly larger pitch and is installed in the fork shaft hole at the end of the gearbox, and the positioning slot is close to the left side of the box.   

7, crankshaft rear end oil seal shell 4125 diesel engine crankshaft rear end oil seal shell separate type, composed of two shells, the middle with two; 4 oil return hole, the upper shell is no oil hole. If the wrong direction, it will lead to the inability to return oil, so in the installation, two; 10 × 40 connecting bolts should be screwed into the upper shell with internal threads from the bottom to the top, without threads for the lower shell.   

8, valve cover 4125A engine valve cover with crankcase courage tube, many mechanics or repair personnel in the assembly, often the outlet of the ventilation tube is facing the engine exhaust. As the air temperature around the exhaust pipe is much higher than the convection movement of the exhaust gas discharged from the vent pipe to the cold air, resulting in increased resistance to exhaust gas emissions. The correct assembly method is: the outlet of the vent pipe back to the engine exhaust.   

9, cylinder head bolts vertical 195 diesel engine cylinder head bolts, one end is the standard thread, one end is fine thread, there is a standard thread end is screwed into the body of the. Double head is the same thread of the bolt, the shorter thread end should be screwed into the body.   10, piston ring, piston, connecting rod big end Piston ring: conical ring small end towards the top of the piston, twisted ring should make the inner circle on the chamfer towards the top of the bribery piston, some piston top near the open end of the "on" or "T" mark, this side must face the top of the piston. Piston: the top of the piston is a double lobe stem end should face the direction of the injector. Connecting rod big end: S195 diesel engine piston connecting rod set installed in the body, the big end of the connecting rod 45 ° profile should face down.   

11, tires, chains tires: tractor drive tires have "human" or "eight" pattern. Installation, from the back of the tractor to see the drive tire pattern, "human" or "eight" shaped pattern top should face up. There are also tires marked with arrows, when installed, the arrow should face the direction of rotation of the tire forward. Chain: If the chain joint of three-wheeled agricultural vehicle uses spring card, the direction of its weapon end must be opposite to the direction of chain movement, so that the card will not fall off due to collision during movement.   

12, clutch oil throwing disk Dongfanghong-75 tractor main clutch driven disk on the oil throwing disk, is designed to prevent the main clutch front bearing too much grease into the surface of the friction plate. When installed, the disc should be facing the front bearing of the clutch shaft (i.e. direction facing forward), so that too much grease can be thrown into the groove of the flywheel and flow into the main clutch housing with the oblique hole, so as not to affect the normal operation of the main clutch. 

The above is the main points and precautions for the assembly of farm machinery parts, must pay attention to the assembly of farm machinery parts must be the correct direction to avoid causing unnecessary is an accident, I hope the above content can help farmers.

 

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