Purging air from piston pump or tandem
gear pump is normally necessary only
under the following conditions:
· When hoses between pumps and hydraulic
reservoir are disconnected.
· When the hydraulic reservoir is drained
· When you suspect that air in pump
cavities is causing hydraulic system
Purge air from piston pump (1).
Loosen but do not remove hose (2)
from reducer (3) at tee (4).
Place suitable container under pump to
catch oil spilled during purging.
Place auxiliary fuel shut-off switch in
A solid stream of oil will flow out of
loosened hose when air is purged from
Crank engine until solid stream of oil
flowing from hose (2) at reducer (3).
While continuing to crank engine, have
assistant tighten hose (2).
Stop cranking engine. Place auxiliary
fuel shut-off switch in "ON" position
If pump will not pump oil after purging, further troubleshooting is required. Refer to (Refer to Para
Check hydraulic oil level (TM 10-3930-673-10).
Fill hydraulic reservoir as required (TM 10-3930-673-10).
Check for leaks (TM 10-3930-673-10).