The STC requires the starter adaptor assembly be changed to p/n 642087A63, which includes an oil scavenge pump
; p/n 652087A64 does not have a scavenge pump
These fuel technicians were replacing a faulty scavenge pump
on an uploaded B-1 forward weapons bay fuel tank.
The scavenge pump
section pulls oil and air from the torque converter sump and pumps it back to the transmission sump.
The transmission utilizes three hydraulic pumps - a gear-type charge pump with a flow of 72 gpm, a gear-type lube/pump with a flow of 129 gpm and a gear-type scavenge pump
with a flow of 207 gpm.
Inspection revealed the aft scavenge pump
had failed and dumped excess oil into the exhaust flange.
Upon inspection of the engine and gearbox, maintenance determined that the gearbox scavenge pump
had failed, preventing return flow of oil from the sump to the oil system, and dumping oil out the back of the gearbox.
All hygienic pump types from the extensive Hilge range will be displayed including a working model of the "Sipla" liquid ring self priming CIP scavenge pump
fitted with the "Tronic" integral variable speed frequency inverter drive for complete pump control.
Some of the parts include fuel transfer pumps, lube and scavenge pumps
and anti-skid components.