Special tools............................................................................................................................................3

Service products .....................................................................................................................................5

System description .................................................................................................................................8

Safety instructions .................................................................................................................................8

Connections for display systems.............................................................................................................8

Maintenance .........................................................................................................................................8

Removal ..................................................................................................................................................9

Gearbox oil line assy - removal ..............................................................................................................9

Torsion shaft- removal ......................................................................................................................10

Disassembly..........................................................................................................................................12

Disassembly of the propeller gearbox ...................................................................................................12

Removal of the propeller shaft ..............................................................................................................12

Removal of the ball bearing and oil seal ................................................................................................13

Removal of the blinding shim................................................................................................................14

Removal of the oil inlet flange ...............................................................................................................14

Removal of the needle bearing .............................................................................................................15

Disassembly of the overload clutch assy................................................................................................16

Disassembly of the damper clutch assy. ................................................................................................17

Inspection .............................................................................................................................................21

Propeller gearbox single parts check.....................................................................................................21

Gear cover assy. check ........................................................................................................................21

Propeller shaft - check .......................................................................................................................22

Overload clutch - check .....................................................................................................................23

Damper clutch - check .......................................................................................................................24

Torsion bar - check ..............................................................................................................................25

Checking the splines............................................................................................................................26

Gear set check (gears).........................................................................................................................26

Pitting, general information...................................................................................................................27

Slight pitting ........................................................................................................................................28

Destructive pitting................................................................................................................................29

Flake pitting (large-area flank fractures) ................................................................................................29

Wear limits ............................................................................................................................................31

Assembly ..............................................................................................................................................36

Installation of the ball bearing ...............................................................................................................36

Propeller shaft - installation ................................................................................................................37

Torsion shaft - installation...................................................................................................................38

Assembly of the overload clutch assy. ...................................................................................................40

Assembly of the damper clutch assy......................................................................................................41

Assembly of the propeller gearbox assy.................................................................................................45

Installation.............................................................................................................................................48

Blinding shim - Installation ...................................................................................................................48

Oil inlet flange- installation .................................................................................................................48

Effectivity: 915 i A Series

Edition 0/Rev. 1

BRP-Rotax

MAINTENANCE MANUAL HEAVY

Chapter: 72-10-00

PROPELLER GEARBOX

72-10-00

Page 1

June 01 2019