13) Propeller Gearbox Reassembly - Rotax MMH-912 Series Maintenance Manual

3.9.13) Propeller gearbox reassembly

Effectivity 912/914 Series
Edition 1 / Rev. 2
BRP-Rotax
Maintenance Manual
See Figs. 72-51, 72-52 and 72-53.
◆ NOTE: At the modification of the gearbox (e.g. reduction ratio,
retro-fit of overload clutch) the part number on the
gearbox housing must be corrected. See Fig. 72-51/1.
Heat gearbox housing (1) with hot air (or in an oven) to approx 100
(212 °F). Press shaft seal (2) into the gearbox housing from the inside,
using insertion jig, part no. 876518, and grease sealing lips (3). Add
radius ring (4) 36/50/ 5.5 with rounded side towards shaft seal. The
weight of the ball bearing (5) must cause it to fall into the bearing point
of the heated gearbox housing. Fix ball bearing in position, using 4
hardened washers (6) 7.2/18.8/3 and hex. screws (7) M7x16.
◆ NOTE: Secure screws with LOCTITE 221 and tighten to 15 Nm
(130 in.lb).
Slide the propeller shaft into the gearbox housing and place on a
suitable flat surface (8). Apply LOCTITE Anti-Seize to the bearing seat
(10) of the propeller shaft (9). Fit a sleeve (12 which is approx. 30 mm
(1.18 in.) longer than the propeller shaft. The inner diameter should be
selected so that the sleeve presses against the inner ring (11). Press on
the gearbox housing, turning it slightly (left-right).
■ CAUTION : Do not tap!
It is an advantage if the gearbox housing is still warm at this stage.
Place distance sleeve (13) 35.2/42/8 and eccenter (14) for the fuel
pump onto the propshaft.
Place these components on horizontally and in this order: step collar
(15) with the ø40.8 mm ( 1.60") towards the disc spring, then two disc
springs (16) facing each other and the third disc spring (17) with its back
to the second disc spring. Make sure that the disc springs lie against
the centering rib (18) of the clutch hub. Apply LOCTITE Anti-Seize to
the tooth profile of the slipper clutch (19) and place it onto the propeller
shaft.
Carefully fit pre-oiled bearing bushing (20) onto the propeller shaft
using circlip pliers. Push on dog gear (21), apply LOCTITE Anti-Seize
to both sides of the plastic thrust washer (22) 33.2/51/1.2 and place it
on together with drive gear (23).
C
°
72-00-00
page 49
July 01/2008