Sprocket bearing adjustment

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Rusty Iron

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I've got a final drive sprocket bearing on my D6c that apears to need adjustment, and of course I don't have the special spanner tool used to tighten the bearing.
Looks like the tool is a 7F9306....is that correct?

Found a new one online for just under $300. For the few times I might need it that's plenty to invest.
Does anyone have a good backyard mechanic method of tightening the bearing without the proper tool?

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Mon, Nov 16, 2020 3:27 AM

Rome K/G

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Two men, two pry bars.

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Mon, Nov 16, 2020 4:08 AM

Rusty Iron

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Reply to Rome K/G:

Two men, two pry bars.

Bar seemed to get it tight.... Thanks

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Mon, Nov 16, 2020 6:51 AM

kittyman1

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Reply to Rusty Iron:

Bar seemed to get it tight.... Thanks

just curious, is there a torque spec for the sprocket bearing? or tolerance of movement?

- i'm more of a numbers guy...

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Mon, Nov 16, 2020 9:27 AM

Rusty Iron

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Reply to kittyman1:

just curious, is there a torque spec for the sprocket bearing? or tolerance of movement?

- i'm more of a numbers guy...

The book says to use a 5' cheater bar and tighten it as tight as you can.

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Mon, Nov 16, 2020 8:58 PM

kittyman1

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Reply to Rusty Iron:

The book says to use a 5' cheater bar and tighten it as tight as you can.

okay thanks Rusty....that sounds TIGHT!

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Tue, Nov 17, 2020 8:12 AM

dpendzic

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Reply to kittyman1:

okay thanks Rusty....that sounds TIGHT!

yes that is tight--could be 1000 ft-lbs if you sat on the end of the bar

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Tue, Nov 17, 2020 8:26 AM

trainzkid88

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Reply to kittyman1:

just curious, is there a torque spec for the sprocket bearing? or tolerance of movement?

- i'm more of a numbers guy...

d4 6u the book say 1250ft/lb of torque on the outer spindle nut. ruff method 2 blokes, inch drive socket and bar, 6 foot of pipe and lean on it.
if you have a engineers black book you have the formula for calculating torque values according to handle length and force applied all you need is the formula, a spring balance scale and a method to apply said force.
a retired ships maintenance engineer showed me how to do it. he used it to do head bolts etc on big marine diesels without using the expensive hydraulic powered torque tools.

its simple really all your doing is shifting the point of measurement to the end of the lever instead of at the fastener.

"i reject your reality and substitute my own" - adam savage. i suspect my final words maybe "well shit, that didnt work"

instead of perfection some times we just have to accept practicality

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Tue, Nov 17, 2020 6:02 PM

trainzkid88

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otc tools make the c hook spanner and yes rather expensive. very simple tool though. i have considered making my own by getting the c hook laser cut out of 1/2 inch high strength steel plate such as bisalloy or strenx. which would cost less than the premade tool. i just havent got that far yet have to do the cad drawing first. better pull the finger out and do it.

"i reject your reality and substitute my own" - adam savage. i suspect my final words maybe "well shit, that didnt work"

instead of perfection some times we just have to accept practicality

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Tue, Nov 17, 2020 6:08 PM

Deebo

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OTC 7308 and 7309 are available nowadays to do the job but at a price.. I found a copy of a 1959 OTC tool catalogue online that had the same wrench as 7309 previously listed as CT-686. I kept an eye on eBay for this version and scored one for $66. Worth looking out for as there's no substitute for the correct tool, makes the job very straightforward and when I removed the adjusting nut from a parts machine so much quicker than a brass drift.

[attachment=61099]IMG_7817.jpg[/attachment]

[attachment=61101]IMG_8412.PNG[/attachment]

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Tue, Nov 17, 2020 11:19 PM

Rusty Iron

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Reply to Deebo:

OTC 7308 and 7309 are available nowadays to do the job but at a price.. I found a copy of a 1959 OTC tool catalogue online that had the same wrench as 7309 previously listed as CT-686. I kept an eye on eBay for this version and scored one for $66. Worth looking out for as there's no substitute for the correct tool, makes the job very straightforward and when I removed the adjusting nut from a parts machine so much quicker than a brass drift.

[attachment=61099]IMG_7817.jpg[/attachment]

[attachment=61101]IMG_8412.PNG[/attachment]

The OTC 7308 seems to come with two interchangable jaws, one 3/8" thick and one 3/4" thick. The OTC 7309 has one jaw only. They seem to have the same capacity but for some reason the 7308 is a lot chaeper.
I'll have to keep a search on e-bay.....maybe I'll get lucky too.
https://www.otctools.com/products/heavy-duty-adjustable-spanner
https://www.otctools.com/products/adjustable-hook-spanner-wrench-0
.

Facom makes a similar one too that has a capacity up to 12 3/4" but it's more expensive.
https://www.misterworker.com/en/facom/heavy-duty-hook-and-pin-wrenches-119/5137.html

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Wed, Nov 18, 2020 2:05 AM

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