Part 14 Removal of Propeller Reduction Gearbox ...

Introduction ...

This page contains photos of the process of removing the propeller reduction gearbox from a ROTAX 912ULS engine (built August 2006



ROTAX 912ULS Propeller Reduction Gearbox Removal

Image 1

Start by removing the 8 x M6 bolts and the two M8 bolts from around the edge of the gearbox housing.

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ROTAX 912ULS Propeller Reduction Gearbox Removal

Image 2

NOTE: This engine has come from a P&M GT450. It has an aircraft registration plate in form of a large maintenance washer bolted on the side of the gearbox housing. The aircraft reg and airframe serial number is stamped on this washer. Once it is removed we can then bolt our gearbox puller tool to the mounting points on the side of the gearbox housing ...

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ROTAX 912ULS Propeller Reduction Gearbox Removal

Image 3

Gearbox puller now attached to the side of the gearbox housing via two the mounting bolts ...

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ROTAX 912ULS Propeller Reduction Gearbox Removal

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Slide the puller down the length of the puller shaft until the gearbox housing begins to break losse from the crankcase. Use less force as the gap expands and eventually the gearbox can just be pulled by hand to remove it ...

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ROTAX 912ULS Propeller Reduction Gearbox Removal

Image 7

Here is the removed gearbox housing on the bench with the puller tool still attached ...

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ROTAX 912ULS Propeller Reduction Gearbox Removal

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And the rear of the gearbox housing that forms a part of the crankcases ...

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ROTAX 912ULS Propeller Reduction Gearbox Removal

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Note the smaller gear from the gearbox gearset, the friction washer behind it and the large nut ...

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ROTAX 912ULS Propeller Reduction Gearbox Removal

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Also note the gearbox roller bearing in the upper section of the crankcase / rear gearbox housing ...

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ROTAX 912ULS Propeller Reduction Gearbox Removal

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Note the lower gearbox dowel pin (one of two) just above the oil pump that has remained lodged in the crankcase / rear gearbox housing ...

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ROTAX 912ULS Propeller Reduction Gearbox Removal

Image 13

And finally a close up of the "small gear" that forms part of the gearbox gearset ...

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