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Old 09-27-2010, 01:05 PM
vanhoand vanhoand is offline
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Join Date: Sep 2010
Location: MI
Posts: 2
Transmission Shift Keys

Hi all,

New to the site and have a SCAG 48" walk behind (belt driven). Occasionally (more often in 2nd and 4th but now in 3rd a little), the transmission seems to be slipping out of gear. I just got the mower used and everything else appears to be functioning properly. I've checked the tension on the drive belt (engine pully to transmission pully) and it doesn't appear to be slipping when the transmission slips. This wasn't a huge deal as I normally mow in 3rd, but now that it's doing it in 3rd as well, I think its something that needs addressed.

I've done some searching on the forums and noticed several people with shift key issues causing similar simptoms. Does anyone have pictures of these or can someone identify what these are in this j-thomas transmission breakdown?

I think that's the correct transmission...

Also, if anyone knows a post with transmission teardown instructions/pictures, that would be helpful too.

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Old 09-27-2010, 01:31 PM
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BigFish BigFish is offline
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Join Date: Jul 2008
Location: chesapeake, va
Posts: 2,603
# 14 are the keys. You wanna look at 1,2,3 detent ball/spring and make sure its ok first. Easy trans to fix, just messy as hell.
It ain't rocket science! far.

'Course if yer house has more wheels than yer truck...
" Old age ain't for sissies "
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Old 09-27-2010, 02:41 PM
vanhoand vanhoand is offline
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Join Date: Sep 2010
Location: MI
Posts: 2

so there's 2 of them and i should see some evidence of wear on them correct?
regarding #1-3. what do those parts do?
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Old 09-27-2010, 09:13 PM
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Restrorob Restrorob is offline
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Join Date: Apr 2005
Location: Show'n my truck off !
Posts: 11,025
You can download a complete service manual with detailed instructions on repairing this trans HERE....
Originally Posted by piston slapper View Post
You never learn anything until you admit you don't know it all...
Originally Posted by MannsLawnService View Post
some times the man in my mirror isn't so smart...
"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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rebuild , shift key , transmission

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