Troy Bilt Bronco 2005 (Model#13AJ609G766) Loose Drive Belt


Old 06-28-11, 09:59 AM
Thread Starter
Join Date: Jun 2011
Location: USA
Posts: 1
Received 0 Votes on 0 Posts
Troy Bilt Bronco 2005 (Model#13AJ609G766) Loose Drive Belt

My husband replaced the drive belt on this mower two times with two different belts, one from our local Napa parts store and one from Lowes. The problem is that the belt has too much slack in it. We found the manual online at the Troy Bilt site and we have it threaded the way that is shown, however there is still too much slack and the mower will sometimes go into gear and sometimes not -- this is an automatic transmission machine. He has not put the deck back on yet, but he says that the deck doesn't have anything to do with the drive belt.

Just want to see if anyone has any ideas. We're to the point of trying a shorter belt, but the ones we got were replacements for the original.

Thanks in advance for any suggestions.
Sponsored Links
Old 06-28-11, 10:24 AM
bontai Joe's Avatar
Join Date: Apr 2004
Location: Pennsylvania
Posts: 592
Received 0 Votes on 0 Posts
You can check to see if any pulley brackets have gotten bent which would allow the extra slack to appear. Also check and see if everything is bolted up tight, such as the motor and rear axel. Then assuming that everything checks out ok, maybe try a belt that's 1/2" shorter.
Old 06-28-11, 10:15 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 17,508
Received 45 Votes on 40 Posts
Don't try a shorter bet or it will never work right. These are very sensitive to belt length, width, AND pitch. The proper belt must be used. Have you tried the mower? The belt won't always tighten until the mower is put into gear and the variator can travel back into place.
Old 06-29-11, 07:54 PM
Join Date: Oct 2007
Location: ontario,canada
Posts: 325
Received 0 Votes on 0 Posts
mtd also has an adjustment procedure for doing after replacing drive belts. will be in the manual
Old 07-03-11, 05:52 PM
30yearTech's Avatar
Join Date: Oct 2006
Location: Central Texas
Posts: 1,176
Received 0 Votes on 0 Posts
Which belt was replaced?

There are two belts on the drive, one from the engine to the variable speed pulley and one from the vari pulley to the transaxle. There is a spring loaded idler pulley that keeps tension on the belt, sometimes the idler spring will break or come off the idler arm and need to be reinstalled.
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title: