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Allis Chalmers Discussion Forum
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Re: 170 category 2 to category 1

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Fred da Farmer

08-21-2013 08:50:13

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Most tractor dealers would have a bushing kit for CAT II to CAT I which is a set of bushings that has inside diameter (id) of Cat I and an outside diamter(od)of Cat II. Use the CAT I hitch pins and slide the bushings into the CAT II sleeve. This is for all tractors.

CAT I Top Link Pins are 3/4 inch in Diameter & decimal is 0.75 inch
Lift Arm Pins are 7/8 inch in Diameter & decimal is .875 inch.
CAT II Top Link Pins are 1 inch in Diameter & decimal is of course 1.0 inch.
Lift Arm Pins are 1 and 1/8 inch in Diameter & decimal is 1.125 inch.

Alternative 2 is not pretty, requires machining/grinding and still leaves some slack.

For a top link bushing:
SCH 40 Steel Pipe of inch (.75 decimal inch) is 1.05"od and 0.82"id; so you'll machine off nearly 3/64 from the od, you'll have one home made top link bushing and inside will have some slack.
If you find SCH 80 steel pipe inch (.75 decimal inch) it has the same 1.05" od and 0.74" id. Machine to fit od and the id.
Arm Lifts bushings:
SCH 40 steel pipe of 1" is 1.32 od - 1.05 id
SCH 80 steel pipe of 1" is 1.32 od - 0.96 id
Machine the outside to 1.125" - nearly 13/64 and inside of SCH 80 pipe 3/64.

Never mind about Alternative 2. go find the bushing kit at a dealer.

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08-21-2013 09:03:48

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 Re: 170 category 2 to category 1 in reply to Fred da Farmer, 08-21-2013 08:50:13  
Bushings for the lift arm and top link pins are cheap and easy to find at your local farm store or on-line.

The issue is that if you have factory mounted sway blocks on the 170 they are 99.9999% of time Category 2 blocks and you cannot get the lift arms close enough together to mount a category 1 implement. You have to remove at least one sway block to do that and then you don't have proper sway control thru the entire lift range with a sway block removed.

Allis made Cat 1 sway blocks but they are VERY VERY hard to find as they haven't been made in decades and nobody is reproducing them yet aftermarket like the Cat 2 sway blocks. If you find just one Cat 1 sway block I believe you can mount a Cat 1 implement with it but there is not much "sway".


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