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Checking H differential gears

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neblinc

01-23-2008 06:55:04




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I have the tranny & differential put back together using all the original shims in the same place. I am really confused reading the service & IT manuals on adjusting the backlash. Does the main trans shaft push to the rear when under load? If so I have very little play in the mesh of the gears and think it's ok where it is. But if I push on the rear of the trans main shaft, I get quite a bit more play between the gears.

Randy

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r4etired

01-23-2008 18:36:56




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 Re: Checking H differential gears in reply to neblinc, 01-23-2008 06:55:04  
First of all you should put the front bearing in and the bearing cage bolted up tight. I learned from experience put the same shims back in you took out, reshiming used gears is almost a guarantied noisy rear end. the book recommendations for backlash are for new gears. Sometimes just putting the O rings on the cage will affect the settings. This is my 2cents worth.



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neblinc

01-23-2008 08:09:19




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 Re: Checking H differential gears in reply to neblinc, 01-23-2008 06:55:04  
So If I remove 1 or both of the shims on the transmission shaft, that should close up the space or slop I am getting now by pushing the shaft forward?

Randy



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Janicholson

01-23-2008 09:03:16




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 Re: Checking H differential gears in reply to neblinc, 01-23-2008 08:09:19  
Randy I think shims should be installed so that t5he trans shaft does not go forward as far. From looking at the diagram on caseih.com search for parts. It appears that the pinioon is adjusted for location by putting shims on either the front side of the ball bearing(away from differential), which moves the pinion closer to the ring gear, or on the rear side of the ball bearing (moving the bearing farther out of the ring gear. The shims are in the rear bearing mount, taking them out and putting them in a position to push the shaft rearward makes sense. The teeth should be in a position of full engagement, but not bound up.
There should be less than .001" movement forward and back on the pinion. If there is slop as you indicated earlier, this slop should be taken out with the shims. JimN

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Janicholson

01-23-2008 07:44:04




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 Re: Checking H differential gears in reply to neblinc, 01-23-2008 06:55:04  
I agree with Owen.
The main shaft should be shimmed to position the pinion to be properly meshed with the ring gear. The total play (front to back in transmissions with a pinion on the output shaft) is usually zero. If the shaft is located by a combination of the front trans bearing, and the rear trans bearing, and they are tapered roller bearings, they must have a tiny bit of preload to prevent misalignment. If the shaft is positioned using thrust bearings, needle or washer type, the end play should be less than .002".
Measured on the ring gear (with a dial indicator perpendicular to the outer edge of a tooth on a tangent line), the backlash is close to .003 to .005". Adjustment of this amount is a combination of the above position of the pinion (forward and back) depth, and the side to side location of the differential. The depth should be set so the pinion teeth have full contact with the length of the ring teeth. The differential position is then set to allow only the above mentioned backlash.
The depth gives good tooth contact, the side to side sets backlash.
There is dramatically more to working with hypoid gears in a automotive differential because the shafts are not aligned in the horizontal plane.
The specifications I have given are experience driven, not from the manual. They are intended to help you understand the issue. Let us know how it is going. JimN

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Theman

01-23-2008 07:34:19




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 Re: Checking H differential gears in reply to neblinc, 01-23-2008 06:55:04  
Due to the pressure angle of the tooth profile, the gears will tend to push away from one another. That means the main shaft will move forward and the differential will move to the right. So, if you're checking backlash move them apart then take your measurement.



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Owen Aaland

01-23-2008 07:15:26




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 Re: Checking H differential gears in reply to neblinc, 01-23-2008 06:55:04  
Normal loading of the gears will force them apart. This will push the main shaft forward.



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