FRAME 5

TM 9-2350-222-20-2-1

TURRET CHECKOUT (CONT)

3-2.

FRAME 5

Troubleshooting

Step

Procedure

Reference

Check operation of hydraulic power supply (TM-

10) for following:

ELEV/TRAV POWER light comes on.

Para 4-4

Power pack motor shuts off between 1200 to

1250 psi and comes on at 900 to 950 psi.

Accumulator nitrogen precharge pressure is

between 500 to 550 psi (TM 20-2-3, para

1-19).

Reservoir oil level shows FULL at zero

pressure.

All personnel should be in a position that will allow

unexpected turret and gun motion without causing

injury. Movement of the gunner's control handles will

cause gun movement in elevation, even though the palm

switch on the gunner's control handles is not pressed.

Check turret traverse and gun elevation operation

in power mode (TM-10) for following

Turret cannot be traversed without pressing

palm switches (safety check).

Turret traverses at a low speed that is smooth

with a travel rate of at least 30 mils in one

minute.

Gun elevates/depresses at a low speed that is

Para 4-2

smooth with a travel rate of at least 30 mils

in one minute.

Gun automatically elevates to zero (+17)

Para 4-5

mils to clear rear deck between 1820 and

1920 mils and again depresses between 4500

and 4600 mils when traversing from 0 mils.

GO TO FRAME 6

Para 3-2 Cont

3-6