In repairing the dry type TD9 TD91 TD92 and early TD9B steering clutches you have a couple of options. If your clutches are totally trashed, or completely frozen, you will probably have to resort to cutting some of the discs out to save the inner driving drum, the brake drum and the pressure plate. That means replacing all of the fiber discs and probably most of the steel discs.  You can do a lot to clean up the steel discs with some heavy duty cleaning, wire brushing and sandblasting. You will want a clean smooth surface so that the steel disc surfaces will not chew up the new fiber or bimetallic discs with their roughness.

The TD9 normally uses 11 fiber discs and 10 steel discs for each clutch. If you do not have to change all of them, and can get by with only changing a few fiber discs, then by all means just replace the bad fiber discs with more fiber discs. If you have to replace all 11 discs, or at least 11 of the 22 fiber discs required for both clutches, then you should consider upgrading and improving one or both of your clutches by using bimetallic friction discs instead of the old style fiber discs.

Upgrading to the bimetallic discs requires 12 bimetallic discs and 11 steel discs per clutch. The bimetallic discs are of course a little more expensive, but you end up with a clutch less prone to having your clutch discs sticking or bonding to each other, a longer clutch life, and an increased friction surface area resulting in a higher coefficient of friction. The bimetallic discs are not nearly as affected by moisture as the fiber discs. You will eliminate the possibility of broken friction disc teeth by choosing the bimetallic option.  Upgrading to the bimetallic disc pack does cost more and you are the only one that can make the decision between the two different styles of clutch packs.  For some people the labor and inconvenience involved in future steering clutch repair is not a consideration, while for others it is very important. 



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Contact John Parks at 1-208-342-8911
General Gear and Machine, 733 Desert Wind Rd.,
Boise, Idaho, 83716  US
All prices are in USD
All OEM part numbers are for references only

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