4 speed countershaft gear

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StueyC
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4 speed countershaft gear

#1

Post by StueyC » Mon Sep 28, 2009 9:31 am

I have pulled the coutershaft gear out of the case to fit a speedo drive. The gear is one peice so it looks like I will need to replace the gear with one that incorporates a speedo drive gear. If possible I would like to order a gear from the same manufacturer. The only marking I can locate on the gears removed is DI30769. Is this part number recognisable to anyone? The transmission case is marked Motor Factory.

StueyC



Ohio-Rider
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Re: 4 speed countershaft gear

#2

Post by Ohio-Rider » Mon Sep 28, 2009 11:33 am

StueyC, Does your cluster gear look like this one? The O.D. on the cluster gear for the speedo wormgear measures 1.191" and is about 5/16 wide. The speedo gear is a press fit over this diameter. -Steve
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StueyC
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Re: 4 speed countershaft gear

#3

Post by StueyC » Mon Sep 28, 2009 12:33 pm

Thanks for the advise Steve. Having never seen one of the speedo drives I hadn't considered it being a press on gear. The thin land between both gears is the same as your photo and measures 2.191" in diameter. All I need now is to get hold of the correct part and the speedo drive to suit the gear. I believe there are two different types available but I'm not sure which is for which application. I have a 2:1 speedo, any ideas which drive I need.

StueyC

Bosheff
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Re: 4 speed countershaft gear

#4

Post by Bosheff » Mon Sep 28, 2009 11:07 pm

As I remember, there are 2 or 3 speedo drive gears that fit on the countershaft. It seems like 3 and 7 tooth or maybe 4 and 8 tooth. At any rate you will need the corresponding gear for the drive unit assembly. You will need to test fit the gear on the countershaft to make sure it meshes sweetly with the drive unit assembly. If not it will turn the smaller drive gear to shit in a hurry. Take yer time, and if ya can git real H-d parts, you'll be farther ahead in the long run. Better a good used genuine H-D part than a new repop part. Good luck....bosheff

StueyC
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Re: 4 speed countershaft gear

#5

Post by StueyC » Tue Sep 29, 2009 6:22 am

Thanks Bosheff. I have found there is 3 different speedo drives and obviously 3 different drive gears. 1936-61 11 teeth, 62-67 13 teeth and 69 on 23 teeth.
If the diameter of the journal on the countershaft of all years is the same and the speedo drive threads are the same then I would think the best option would to buy the 23 teeth gear and suitable drive?

My theory being the more teeth the less wear. Am I correct?

StueyC

Cotten
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Re: 4 speed countershaft gear

#6

Post by Cotten » Tue Sep 29, 2009 2:09 pm

I would suggest the late 1:1 ratio, because its a lot cheaper when it comes to the speedometer!

Note also that the ring gear must be trued accurately for sideplay with the cluster between inspection centers.
When tapping it square, take great care not to strike it close to the 'end of the tooth' where the metal is cut delicately thin.

Good luck!

....Cotten

StueyC
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Re: 4 speed countershaft gear

#7

Post by StueyC » Tue Sep 29, 2009 2:23 pm

Thanks for the advise when fitting the drive gear Cotten. I already have a speedo sitting in a box waiting to be fitted. It's a 2:1 ratio. Do you know which gear I need to fit to suit ?

StueyC

Cotten
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Re: 4 speed countershaft gear

#8

Post by Cotten » Tue Sep 29, 2009 2:37 pm

StueyC!

Off-hand, I only know 2:1s are the ones with fat teeth.
(35635-36 for the ring gear; 67130-36 for the drive.)

....Cotten

Bosheff
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Re: 4 speed countershaft gear

#9

Post by Bosheff » Tue Sep 29, 2009 11:24 pm

Thinking back on it, I've seem some fiber drive gears somewhere. I don't know if they were repop, or genuine. I'm thinkin' repop. I'd stay away from them if possible. Also, when installing the speedo drive gear on the countershaft, it don't hurt to freeze the countershaft and heat the drive gear when installing. Before I did that, I'd mic the O.D. and I.D. to see what ya got to start with. And as Cotton said, be very careful installing the gear on the countershaft, as it doesn't take much to damage the outer edge of the gear....bosheff

StueyC
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Re: 4 speed countershaft gear

#10

Post by StueyC » Wed Sep 30, 2009 12:15 am

Thanks for the help with this one Cotten and Bosheff.

StueyC

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