Thread Tools
Old Nov 08, 2005, 02:26 PM
Randy Due is offline
Find More Posts by Randy Due
Am I registered?
Randy Due's Avatar

What's The Proper Procedure For Changing Spur Gear In Cobri Gearbox?


I need to change ratio in my Cobri. How do you remove and replace the spur? I have a puller for the pinion, but thought I would ask before trying the spur. Thanks.

Randy
Sign up now
to remove ads between posts
Old Nov 08, 2005, 02:39 PM
mexico is offline
Find More Posts by mexico
Registered User
mexico's Avatar
A pinion or gear puller is - as the name implies for pulling off the pinion gear from the motor shaft. The spur gear on the Cobri Gearbox is simply presss fit. Firmly but carefully apply even pressure as close to the center of the gear as you can with two thumbs and it will come off.
Old Nov 08, 2005, 03:55 PM
Dr Kiwi is offline
Find More Posts by Dr Kiwi
Registered User
Dr Kiwi's Avatar
Quote:
Originally Posted by Randy Due
I need to change ratio in my Cobri. How do you remove and replace the spur? I have a puller for the pinion, but thought I would ask before trying the spur. Thanks. Randy
I take the shaft and spur out of the gearbox, slip the shaft between the jaws of a vice (just open enough to allow the shaft between) so that the spur rests flat on the top of the vice. Tap lightly on the 'front' end of the shaft and gently drive it down through the spur. Fit the new spur by placing it, front face down, on the top of the vice and tap the shaft through from the rear.

Cheers, Phil
Old Nov 08, 2005, 09:37 PM
Randy Due is offline
Find More Posts by Randy Due
Am I registered?
Randy Due's Avatar
Thanks! Any green Loctite on the spur needed?

Randy
Old Nov 08, 2005, 09:57 PM
Dr Kiwi is offline
Find More Posts by Dr Kiwi
Registered User
Dr Kiwi's Avatar
No, it goes on over the splines.
Old Nov 08, 2005, 11:19 PM
Randy Due is offline
Find More Posts by Randy Due
Am I registered?
Randy Due's Avatar
Okay. Thanks.

Randy


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Whoops! What's the best prop for Tiny - IPS C gear and 3 Li-Po?? poobs Parkflyers 23 Nov 20, 2003 09:40 PM
What's a good mod for TM landing gear? The Max-Q Parkflyers 4 Mar 19, 2003 09:45 PM
Breaking in NEW batteries . . . what's the proper technique??? EFoil Electric Plane Talk 13 Aug 02, 2001 10:25 AM
Breaking in NEW batteries . . . what's the proper technique??? EFoil Power Systems 5 Aug 01, 2001 01:32 AM
Breaking in NEW batteries . . . what's the proper technique??? EFoil Scale Kit/Scratch Built 1 Jul 31, 2001 09:17 PM