Common problems of loader maintenance knowledge


Published on.

2021-09-15

When not walking or walking slowly, the main drive shaft rotates quickly and powerfully. When the engine speed is increased, the increase in the speed of the main drive shaft is obviously out of proportion to the front and rear drive shafts. The transmission oil pressure of neutral gear and other gears is normal, and the pressure drops obviously after this gear is engaged.

The loader is weak or does not walk in a certain gear, and the rest of the gears are normal.

Judgment points:

When not walking or walking slowly, the main drive shaft rotates quickly and powerfully. When the engine speed is increased, the increase in the speed of the main drive shaft is obviously out of proportion to the front and rear drive shafts.

The transmission oil pressure of neutral gear and other gears is normal, and the pressure drops obviously after this gear is engaged.

cause of issue:

1) The bearing cap or nylon ring is severely worn.

2) If the bearing cover or nylon ring is in good condition or slightly worn, it is confirmed that the internal and external sealing rings of the gear clutch are not well sealed.

Method of exclusion:

Replace the corresponding damaged parts, namely the bearing cover or nylon ring, the inner and outer sealing rings, and readjust the gap between the shaft sleeve and the bearing cover.

Fault analysis: Weakness or non-walking in a certain gear, the problem of the common oil circuit and components of the torque converter, travel pump, pressure reducing valve and other gears can be ruled out. The fault occurs only after the transmission control valve. The oil path between the clutch pistons. After the weak parts such as bearing cover, nylon ring, inner and outer sealing rings are worn out, the oil supplied to the clutch piston chamber leaks from the worn parts in large quantities, resulting in a decrease in oil pressure. In neutral or other gears, the oil pressure display is normal because the oil does not flow through the wear parts.

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