John Deere GT275 throwing deck belt

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KCinTN

Forum Newbie
Hello all, just got here...
Trying to get a JD GT275 running for fall leaf vac duty and when I engage the blades, it throws off the deck pulley belt.
48" deck, belt on per manual config, it throws the belt as soon as the blades are engaged. Any ideas appreciated!
JD GT275 mower 48 inch deck.jpg
 
If all pulleys and tensioner arms are moving freely the problem I found is customer is not using OEM belts. Had a customer about five years ago, with that same JD setup went through after market belts for two months before him finally took my recommendation to spend the extra cash for JD belts. Solved the problem.
 
Rivets said:
If all pulleys and tensioner arms are moving freely the problem I found is customer is not using OEM belts. Had a customer about five years ago, with that same JD setup went through after market belts for two months before him finally took my recommendation to spend the extra cash for JD belts. Solved the problem.
Click to expand...
Thx
Both belts are new from JD
 
KCinTN said:
Hello all, just got here...
Trying to get a JD GT275 running for fall leaf vac duty and when I engage the blades, it throws off the deck pulley belt.
48" deck, belt on per manual config, it throws the belt as soon as the blades are engaged. Any ideas appreciated!
View attachment 74520
Click to expand...
How many hours on mower? Is this your mower you have had for many years, or working on for someone else? Check each idler pulley and spindle for slop and play, check tensioner arm for slop and play, check the plane of the belt by getting down at eye level and looking across the deck at pulleys and spindles. Do they all line up? Check deck belt tension. Check all belt guides and be sure they are in the right position.
 
Forest#2 said:
Is this your mower you have had for many years, or working on for someone else?
Click to expand...
Thx Tiger & Forest for your reply!
Is my mower, bought it slightly used in ‘98 I think. About 1000 hrs on mower, will verify.
Will verify pulleys are solid, nothing noted by feel.
Will check bushings on the “tensioned” pulley, there may be some vertical play there….
Thx again for your help!
 
The tension spring in the middle looks to be a generic spring and is not applying tension like it should. The coils of the springs should be spread a little which would indicate good tension
 
Thx, AutoD, will confirm that it was bought @ JD store. It was some time back & it was in a small box with the double pulley that was new from JD...worth checking!
 
Please provide the chassis PIN label information so we can get better details in the parts and service information. JD did not build the all the same and a serail number break can make a lot of difference when it comes to design configurations.

It is also curious that it has no belt guides/stays on the tensioner and idler pullies.
 
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