18-2. HYDRAULIC SYSTEM SERVICE (CONT)
Purging Air from Tandem Gear Pump.
Do not attempt to purge large and small
sections of tandem gear pump separately.
Always purge both sections whenever
purging is necessary. Failure to purge
pump as directed may result in severe
damage to pump.
· Hydraulic tandem gear pump has two
sections, large and small.
· The large section supplies hydraulic pressure
to boom extend cylinder, boom hoist
cylinder, and steering system.
· The small section supplies hydraulic
pressure to brake system and frame tilt
Purge air from tandem gear pump (5).
Loosen but do not remove hose (6) from
Loosen but do not remove hose (8) from
Place suitable container under tandem
gear pump (5) to catch oil spilled during
Place auxiliary fuel shut-off switch in the
"OFF" position (TM 10-3930-673-10).
A solid stream of oil will flow out of loosened hoses when air is purged from pump.
Crank engine until solid stream of oil flows from hoses (6) and (8). While continuing to crank engine, have
assistant tighten hoses (6) and (8).
Stop cranking engine. Place auxiliary fuel shut-off switch in "ON" position