During maintenance of the hydraulic system, check the oil level in the tank with the platform lowered according to the indicator mounted in the tank cover.

The level must be between the H and B marks on the pointer

For seasonal maintenance, the oil in the hydraulic system should be changed.

To drain the oil, unscrew the drain plug, for a more complete emptying of the system, disconnect the hose from the suction pipe of the oil pump.

To fill the hydraulic system with oil, unscrew the oil tank cap, remove, rinse and reinstall the strainer.

It is necessary to fill in oil up to mark B, printed on the oil level indicator, after which it is necessary to raise and lower the platform 3...4 times at an average crankshaft speed (1100...1300 rpm) to remove air from the system .

After that, the oil level is checked and, if necessary, topped up to mark B.

Kamaz platform lifting hydraulic system diagram

For a gear pump, cavitation is dangerous - the release of gases and vapors from a liquid (liquid boiling).

In this case, steam-gas bubbles are formed in the rarefaction zone, which move to the compression zone and are destroyed there, causing mechanical damage in the pump (damage to the gear surfaces).

During cavitation, there is increased noise and vibration of the pump.

Cavitation is caused by the following reasons:

  • - leakage of the suction pipeline, which leads to air ingress into the suction zone;
  • - clogging of the oil tank filters and insufficient oil level, its foaming, clogging of the breather.

To prevent cavitation, it is necessary to monitor the tightness of the pipelines and the cleanliness of the oil tank breather;

  • - timely add oil to the required level;
  • - fill the system with oil corresponding to the season; in the cold season, you cannot immediately turn on the pump at maximum speed and under the working load, you must let it idle in order to warm up the oil in the hydraulic system and thus reduce its viscosity.

The lifting angle of the platform, if necessary, is set with an adjusting screw on the valve for limiting the lifting of the platform so that the platform of the KamAZ-5511 dump truck stops at the moment the holes of the overframe and the platform for the locking fingers are aligned.

The lifting angle of the KamAZ-55102 dump truck platform is limited within 48 ... 50 ° when it is overturned both to the right and to the left.