In the maintenance of agricultural machinery, some parts are not restricted by the structure, and they will be installed backwards or incorrectly when assembling with a little carelessness. This will leave potential troubles for the agricultural machinery. Therefore, attention must be paid to the assembly.
Cylinder head gasket: If there is an oil hole, it must be aligned with the corresponding oil passage hole on the body and cylinder head to avoid dry friction of the air distribution mechanism on the cylinder head due to oil cut. There is no oil passage hole and the front and back shapes are the same, which is determined by the material of the cylinder head: for aluminum alloy cylinder heads, the curled side of the cylinder head should face the cylinder block; for cast iron cylinder heads, the curled side of the cylinder head should face the cylinder head .
Pistons and piston rings: Pistons with upward arrow marks on the top should be installed in the direction specified by the marks; if there is no mark, the vortex pit or the small notch beside the pit on the piston top should be facing the injector side to ensure The mixture is evenly mixed. When assembling the piston ring, the top with “up”, “UP” and other marks should face up; for twisted rings with no marks on the top, the inner groove or chamfer should face down; the chrome-plated ring (shiny shell) should be installed In the first piston ring groove. Each ring opening should be staggered by 120 to 180 degrees to ensure its sealing and oil distribution effect.
Connecting rod and connecting rod cover: The large end of the connecting rod of the horizontal diesel engine is divided by 45 degrees, and the section should be downward to improve the force of the connecting rod bolt. The connecting rod cover and the connecting rod are processed in pairs. The matching marks should be on the same side during assembly to ensure that the roundness and cylindricity of the connecting rod bearing meet the specified requirements.
Main bearing cap, bearing bush or bushing: The main bearing cap and the housing of the machine body are all processed by matching boring. They should be seated according to the matching mark. Do not interchange or change the assembly direction at will, so as not to damage the coaxiality and size of the main bearing seat hole Accuracy. Bearing bushes or bushings with oil holes should be aligned with the corresponding oil passage holes on the bearing seat and bushing holes to ensure a smooth lubricating oil path.
Cylinder head bolt: If one end of the bolt is coarse thread and the other end is fine thread, then the coarse thread end should be screwed into the body; if both ends of the bolt are fine threads, the shorter end should be screwed into the body , To ensure that the cylinder head can be pressed tightly.
Oil pump and fuel injection pump: The oil adopts planetary rotor type. The outer rotor should be chamfered toward the pump body to prevent the oil from circulating in the pump and lowering the pump oil pressure. The crescent-shaped positioning groove on the injector shaft plug sleeve should be aligned with the positioning hole on the pump body, and the mark on the plunger (or oil return groove) should be installed upwards to avoid no fuel supply or diesel engine runaway.
Foamed plastic filter element: The air filter using foamed plastic filter element should be installed in the same direction as the winding direction of the filter and the flow direction of the intake air to reduce the pressure of the intake air.
Clutch friction plates, disc springs, brake shoes, bearings: If the lengths of the two hubs of the clutch friction plates are inconsistent, the two long hubs should be installed opposite to each other (the short hubs are opposite), otherwise the clutch will not be engaged; the friction plate is riveted For the oil slinger, the oil slinger should be directed toward the flywheel to avoid oil pollution. For double-acting clutches that use disc springs as the compression element, the small ends of the two disc springs should be opposed to ensure reliable compression of the friction plates. For unbalanced wheel brakes, the brake shoe with the longer friction lining should be the front brake shoe, otherwise it will cause uneven wear of the brake shoe and reduce the braking effect. The 60204 (outside) and 60206 (inside) semi-enclosed bearings are used for support. The closed surfaces with rubber rings should be opposite to each other, and other bearings should not be substituted, otherwise it will cause oil and water in the clutch cavity.
Drive shaft and drive chain: The drive forks at both ends of the drive shaft should be in the same plane to avoid torsional vibration and damage to the drive components. If the drive chain adopts hardware spring clips, the direction of the opening end should be opposite to the direction of chain movement to avoid collision and fall off during movement.
Driving wheel: If the driving wheel is marked with an upward arrow, it should point to the direction of rotation of the tire when moving forward; if there is no mark, the driving wheel should be pointed upward when viewed from the back of the locomotive.