Troy Bilt Horse XP Lawn Tractor [13YX79KT011] Parking Brake Help

C

cmayo

Active Member
It's been ages since the parking brake on my Horse XP lawn tractor worked, and the biggest obstacle to a DIY fix has been a near-complete lack of information about the brake. I made a little progress toward finding info when I learned that the parking brake was part of the transaxle (seems like a Kohler-branded Tuff Torq K46), and I finally managed to dig up a truly helpful YouTube today (Video) that showed how to R&R a brake that was near-identical to mine.

One question the video didn't answer is about how wobbly the rotor (for want of a more correct term) is on its axis. The video linked below begins with an excerpt from the YouTube video where a person is spinning his rotor manually, and the rotor doesn't show any sign of wobble. Following that clip, is a clip of my demonstrating the wobble in my rotor. So the question is, how is the rotor secured on its shaft? Should I worry about the wobble (the brake assembly doesn't hold it in place when it's bolted on), and how can I correct it?

Secondly, what search terms would lead to more information on this assembly, like an exploded parts diagram, replacement part numbers, R&R procedure, etc.?

Dropbox

www.dropbox.com www.dropbox.com
 
Drop box wants a person to sign up and I'm not down with that.

As for the brake, tighten the center nut on the apply bracket a quarter of a turn at a time and see how the brakes act. The stopping brake and park brake are the same mechanism on most of these. The pedal lock is what holds the brakes when parked.

Tuff Torq is who makes the rear drives for many different branded mowers, not Kohler. Kohler makes many of the engines.
 
Sorry about the Dropbox link. Here's a short gif instead.
 

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Hello C.,

That play is a result of age and wear. When new they have a snug fit on the splines.

A new disc would fit better, but I don't see the importance or need for a new one. The brake is not utilized that much except for hold the machine when parked and the clutch/brake pedal is locked down.

Rolling resistance is what primarily slows down the machine when the clutch is used. These brakes do not operate like regular vehicle brake systems.
 
The transaxle is not a Tuff Torq but is a Hydro Gear T2. As parts what is the Hydro Gear model number on the transaxle?

As for the rotor it have very little play on the shaft spline, just to allow the rotor to self center [float] on the brake shaft. The rotor tend the one to wears it splines out.

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None of the Tuff Torq K46 docs had the same brake assembly as mine, so I finally got desperate enough to look for a label on the transaxle. Turns out, it's a HydroGear T2, not a Tuff Torq K46. Duh. And there appear to be several informative references to this transaxle online... I'll post a link to the Hydro-Gear T2 service manual below, but I'm still looking trying to find out if my wobbly rotor is normal, but the service manual isn't so helpful there:

Disassembly: Remove the brake rotor (121), the inner puck (120) and the seal (7) and discard.
Assembly: Reassemble all parts in the reverse order of disassembly

Hydro-gear T2 Manual
 

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StarTech said:
The transaxle is not a Tuff Torq but is a Hydro Gear T2. As parts what is the Hydro Gear model number on the transaxle?

As for the rotor it have very little play on the shaft spline, just to allow the rotor to self center [float] on the brake shaft. The rotor tend the one to wears it splines out.

View attachment 74090
Click to expand...

Funny, we posted the same thing nearly simultaneously. It helps to be searching for the right part, doesn't it? I'm not sure if you're saying the rotor wears out the spline, or the spline wears out the rotor but for $12 including shipping, I just went ahead and ordered a new rotor. Hopefully, I'll find I can just pull the old one off! Thanks!
 
Auto Doc's said:
Hello C.,

That play is a result of age and wear. When new they have a snug fit on the splines.

A new disc would fit better, but I don't see the importance or need for a new one. The brake is not utilized that much except for hold the machine when parked and the clutch/brake pedal is locked down.

Rolling resistance is what primarily slows down the machine when the clutch is used. These brakes do not operate like regular vehicle brake systems.
Click to expand...
As I told @StarTech, a new rotor's only $12 and I already have the brake off and torn down, so I just went ahead and ordered a new one - I'd rather have a snug fit which might mean less wear going forward. Thanks for your reply!
 
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