6) Drive For Vacuum Pump And Propeller Governor - Re-Fitting; 7) Vacuum Pump - Rotax 914 F Maintenance Manual

14.4.6) Drive for vacuum pump and propeller governor - re-fitting

See Pic. 219, 220 and 221
Lubricate new needle sleeve E. Position puller cap P, part no. 876 489 on
gearbox side, place press-in tool, part no. 877 579 { onto the needle sleeve
q
Pic. 220
P
}
w
W
P
Pic. 221
00254

14.4.7) Vacuum pump

See Pic. 222.
The vacuum pump serves as drive of pneumatic inertial navigation instru-
ments.
Check teeth Q. Remove connections or plugs W from used vacuum pump. If
still in good condition they can be re-used. Renew damaged connections. For
fitting of hose connections, the pump can be clamped in a vice with drive
downward, using protective jaws.
Spray connection threads R 3/8" NPT with
silicon and let dry. Do not use Teflon tape,
hose sealing lacquer or thread grease on the
connections. Only tighten connections with
ring- or socket wrench and bring them to
correct position. Retighten by max. 1,5 turn.
Date
Page
1997 02 01
238
and fix with hex. nut }. Turning the hex. screw q clockwise, the needle
sleeve is pressed in completely.
The ball bearing W is pressed in with same procedure,
however, the puller cap P part no. 876 489 is fitted on
E
{
00253
}
q
ATTENTION: The length of Allen screw Y M8x14 must be absolutely
respected as otherwise the screw will collide with the drive
shaft of vacuum pump.
NOTE: The vacuum pump must not be taken apart and must be
renewed as complete unit, if necessary. Renewal during
overhaul at the latest.
ATTENTION: Only clamp on flange E. Never clamp the pump directly on
pump housing as this would damage the pump rotor. Never
install a pump that has been
dropped!
Main
914 F
pump flange side, and the press-in tool w, part no.
877 595, is used.
Then press in new oil seal O with assembly punch,
part no. 877 276 and grease it. Apply LOCTITE 221
to countersunk screw U M5x12 and washer I for
ball bearing fixation and tighten.
Fit vacuum pump gear R and fix drive sleeve T
with holder, part no. 242 660. Apply LOCTITE 221
on Allen screw Y M8x14 and turn in.
Reference
1
2
00255
4
3
Pic. 222
Modification no.
- 0 -