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Discussion Starter · #1 ·
I have a JD 345.

Over the past year or so, I've noticed a decrease in performance of the drive wheels.
As the unit warms up, the speed, power and responsiveness of the drive transmission go down.

Mower, tiller and snowblower are not affected, just the drive wheels.

When I changed the hydraulic oil and two filters, I experience a brief return to "like new" performance . . . approx 10 min later . . . back to slow.

Any ideas on what might be happening?

Thanks for any help you offer.
 

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I don't have the manual open but since the drive circuit is the only one having issues and you saw some short lived improvement with fresh fluid the relief pressure might be low. Many relief valves are adjustable, not sure about this one, but you'll need a pressure gauge and possibly a flow meter to set it correctly.
 

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I'd check the drive belt condition and tension and the tensioner mechanism to make sure it's up to snuff. Those K series transaxles are pretty reliable. I think it's a K71 transmission and you may be able to find service info on the Tuff Torq site.
 

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I'd check the drive belt condition and tension and the tensioner mechanism to make sure it's up to snuff. Those K series transaxles are pretty reliable. I think it's a K71 transmission and you may be able to find service info on the Tuff Torq site.
Yes, very much sounds like a belt issue.
 

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I'm not sure about your problem but on my 318 it wasn't going as fast figure it was old age , but when I was changing the hyd filter I noticed the linkage was worn a little , on mine it was a roll pin hole egged out , drilled it bigger and roll pin helped a lot ,
 
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