HH100 Starter Bendix Question

[rmaynard 16,579]

I've never had an HH100 before. This has a starter with a Bendix. My question concerns the Bendix. The gear was stuck in the outward position. After tapping it back, I removed the starter, and subsequently the Bendix. It came apart in six pieces.

 

 

My question concerns the part A and B shown below. Is "A" supposed to be pressed into "B",  if not, what holds the two together?

 

 

The two pieces will hold together loosely because the cover of B is rubber. But the cause of the gear jamming is that "A" moves back, and "B" does not.

 

 

[J854D 141]

Back in the day, I’ve worked on numerous of that style starter. The layout of the bendix parts in your picture looks complete and in the proper order. I believe parts “A” & “B” work together as a friction fit. The rubber covering on part “B” grips part “A” tightly as they spin & connect with the flywheel. The more the starter cranks, the tighter the grip between “A & B” gets. I also believe this setup takes a bit of the harshness away when the flywheel & bendix connect. As far as the gear jamming goes, the flywheel will centrifugally throw out the bendix after the engine starts with the help of the small bendix return spring. That bendix disengagement process is how a lot of old tractor starters operate. I would recommend a light amount of dry graphite lubrication on the splines of part “A” and the armature splines too. -JD-

Edited August 17 by J854D

[rmaynard 16,579]

 

2 hours ago, J854D said:

Back in the day...

Thanks for that. When I got the tractor, the starter would only hum and the flywheel would not turn. The small gear was jammed against the flywheel, holding the whole thing from turning. The black part A was back against the starter. B was at an angle to the shaft because there is nothing except A to keep it aligned. After taking it apart, it looks as though the rubber is worn sufficiently to have little ability to hold the part A. I cleaned everything and applied graphite to the moving parts before reassembling. I'm hoping this will allow it to work as intended, as there are no kits for the 11 tooth bendix.

[J854D 141]

1 hour ago, rmaynard said:

 

After taking it apart, it looks as though the rubber is worn sufficiently to have little ability to hold the part A.

That makes sense. Parts “A & B” would need to be in reasonably close alignment in order to work together, and that extra wear will only complicate that. Hopefully with the cleaning and lubricating you did, the bendix assembly will able to move freely and function normally . -JD-

Edited August 17 by J854D

[rmaynard 16,579]

I did find a Stens replacement for the gear.

The new rubber should do the trick 

 

[rmaynard 16,579]

Followup:

I got the Stens replacement rubber-covered gear in the mail last week. Under $12.00 delivered. Installed it today and it works flawlessly.

[RED-Z06 2,679]

Alot of the newer Kohler Twins use the rubber friction style bendix also, sadly the starters themselves are low quality so its not a great representation of that design...but in general they should last a very long time and engage very smoothly.