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TM 10-3930-660-24-1
HYDRAULIC SYSTEM MAINTENANCE - CONTINUED
0172 00
NOTE
Purging air from the piston pump or tandem gear pump is normally necessary only under the following con-
ditions:
When hoses between pumps and the hydraulic reservoir are disconnected.
When the hydraulic reservoir is drained and refilled.
When it is suspected that air in pump cavities is causing hydraulic system malfunction.
PURGING AIR FROM PISTON PUMP AND TANDEM GEAR PUMP
CAUTION
To prevent internal damage to piston pump, be sure pump housing is filled with oil before beginning purging
procedures.
NOTE
The piston pump supplies hydraulic pressure to the MLRS attachment cylinder assembly, to the carriage tilt
cylinders and to the fork sideshift cylinders.
1.
At piston pump (1) loosen, but do not remove, hose
3
2
(2) from reducer (3) at tee (4).
NOTE
4
1
Place container under pump to catch any
oil lost during the purging process.
2.
Place auxiliary fuel shut-off switch in the OFF posi-
tion (TM 10-3930-660-10).
NOTE
A solid stream of fluid will flow out of
loosened hose when air is purged from
pump.
3.
Crank engine until solid stream of fluid is flowing
from hose (2) at reducer (3). While continuing to
crank engine, have assistant tighten hose (2).
4.
Stop cranking engine. Place auxiliary fuel shut-off
switch in the ON position (TM 10-3930-660-10).
409-636
0172 00-2

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