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Ride a Matic diff questions


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#1 Meteor149 OFFLINE  

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Posted January 08, 2017 - 03:11 AM

I'm a little confused about RAM diffs. I always assumed that they all had open diffs. I was surprised when reading the manual for my '61 RAM that the diff is adjustable for limited slip, similar to many later Bolens (albeit with tools). The confusing part is that period ads tout a new "automotive differential" that doesn't tear up the lawn as if an open diff was a new thing. Did early RAMs have live axles or is it all just marketing double talk?

#2 Bruce Dorsi ONLINE  

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Posted January 08, 2017 - 06:30 AM

There were changes made to RAM differentials over the years.

 

1956-1958 used a pawl mechanism in the rear wheel hub to allow "differential" action.

 

1959-1962 used an "automotive-style" differential having spider and bevel gears although there were revisions made over those 4 years.

 

Only the 1961 Models 233 & 234  and  1962 Models 235 & 236 had the "pressure controlled" differential which was designed to be adjustable. 

 

Adjustability of the differential action was not described in the 1961 Owner's Manual, but was included in the 1962 Owner's Manual.  .....There was a Service Bulletin (also in the Ride-A-Matic Manuals forum) issued to dealers about adjustment. 

 

The 1959 & 1960 RAM's did not have the friction disc or spring washer to facilitate adjustment of the differential "slippage."


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#3 Meteor149 OFFLINE  

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Posted January 11, 2017 - 06:36 PM

Great answer Bruce, thanks! I noticed the adjustable components in the exploded parts drawing for my `61. It looks like I`ll have to get/print out a `62 owners manual to get the adjustment instructions. 



#4 Bruce Dorsi ONLINE  

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Posted January 11, 2017 - 11:43 PM

Here's the 1962 Owner's Manual:

 

http://gardentractor...-matic-tractor/

 

The differential adjustment is described on page 4.


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#5 Meteor149 OFFLINE  

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Posted January 13, 2017 - 01:09 PM

Thanks again, that`s awesome. It looks very simple to adjust. I`m looking forward to playing with it a little.






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