6) Drive For Vacuum Pump And Hydraulic Governor Reassembly; 7) Vacuum Pump - Rotax 912 Series Maintenance Manual

14.4.6)
q
fig.136
P
00253
}
w
W
00254
P
fig. 137
14.4.7)
1
3 4
00255
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL II
Drive for vacuum pump and hydraulic governor reassembly
See fig. 135, 136 and 137.
Insert new needle sleeve E lubricated with motor oil. Position puller capP,
part no. 876 489, on gearbox side, place press-in tool, part no. 877 579 {
onto the needle sleeve and fix with hex. nut } and washer. By turning
the hex. screw q the needle sleeve is pressed in completely.
The ball bearing is pressed in with same procedure, how-
E
ever, the puller cap P, part no. 876 489, is fitted on pump
{
flange side, and the press-in tool w, part no. 877 595,
is used.
}
Then press in new oil seal O (grease sealing lip with
motor oil) with assembly jig, part no. 877 276. Apply
LOCTITE
washer I for ball bearing fixation and tighten.
Fit vacuum pump gear R and drive sleeve T and fix
with holder, part no. 242 660. Apply LOCTITE
q
Allen screw Y M8x14, fit and tighten to 25 Nm (220
in.lb.).
The length of the Allen screw Y M8x14 must be impera-
CAUTION:
tively respected or it will interfere with the drive shaft for
vacuum pump.
Vacuum pump
See fig. 138.
The vacuum pump serves as drive of pneumatic inertial navigation
instruments.
NOTE: The vacuum pump must not be dismantled and must be
renewed completely, if necessary. Renewal at overhaul
at the latest.
Remove and check toothing Q, connections or plugs W from
2
the used vacuum pump. If in good order, re-use, but renew
damaged ones as required. For fitting of hose connections,
clamp vacuum pump with drive end downwards in vice using
protective grips.
CAUTION: Clamp pump on flange E only. Never clamp on
Spray silicone on connection thread R 3/8" NPT and let it dry.
Do not use Teflon tape, sealing paint or thread grease at
fig. 138
connections. Tighten connections exclusively by ring- or socket
spanner and ensure correct positioning. Re-torque by 1,5 turns
at the most.
221 to countersunk screw U M5x12 and
®
pump housing as pump rotor would be dam
aged. Never install a pump which has been
dropped!
®
221 on
page 91
Initial issue, Jan. 01/2002