Service - TM-5-5420-279-230410

TM 5-5420-279-23

NOTE

When checking the oil levels and it is found that the levels have risen, it could mean that

oil is penetrating either from the gearbox seals or the motor rotary seal. Report any

instances of this to Engineering Control.

This operation should be carried out while the oil is hot.

Service

(1)

De-pressurize hydraulic system. Refer to unit maintenance procedure 5-118.

(2)

On the gearbox remove the oil filler plug (1) and the oil level plug (2).

(3)

Unscrew the drain plug (3) and allow the oil to drain into a suitable container.

(4)

Check the drain plug magnetic insert for metal particles. Report any findings.

(5)

Refit the drain plug (3) and fill to the level plug (2) with oil.

(6)

Refit the level plug (2) and the filler plug (1).

(7)

Operate the gearbox unit to circulate the oil.

(8)

Drain the oil by repeating operations steps 1 thru 3.

(9)

Refit the drain plug (3) and fill to the level plug (2) with oil.

(10)

Refit the level plug (2) and the filler plug (1).

(11)

Briefly operate the gearbox unit to eliminate any air pockets.

(12)

Repeat operations 1 thru 12 on second gearbox unit.

5-154