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TROYPONY clunking-whirring sounds

varispeed pulley whirring pulley slipping pulley drive belt problem drive belt belt slipping pulley slipping

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#1 billingeorgia OFFLINE  

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Posted August 20, 2016 - 08:59 PM

We have a Troy Bilt Lawn Tractor 2008 model..

It starts and moves forward and cuts for the first few minutes ok..

Then it will stop whilst moving forward  ..and .will not move at all unless I put the selector knob: F lever back into N then into F again and it will then move forward again..

It will operate ok it seems at lower speeds / gears...but I cannot get it to operate past 3 gear... nd have to keep the speed low as well On our model the manual states it we should select the "Rabbit" (High speed) setting when mowing etc .. not possible.. at speeds higher than 1/4 way up on the right hnd dash adjsuter, it will stop as outlined above.. There is also a very high pitched "whirring" sound coming from the section underneath the driver seat.. There are 3 pulleys in there..

 

One is the varispeed (?) pulley.. this has 2 belts on it.. one is the engine pulley belt at the bottom half  of the varispeed pulley and another belt, the Drive belt? on the top half of the varispeed pulley....

This top belt goes left to right across to a smaller pulley (idler pulley?) then backwards toward the rear, to a much larger drive(?) pulley...

The machine also "clunks and shudders" intermtttently (sound coming from below the battery section transmission/pulley sections..) when the whirring starts.. so not sure if its a slipping belt, or one of the pulleys not spinning freely..? Only happens at the higher speeds..

 

Not sure which one of these pulleys is making the very loud "whirring" noise mentioned above that happens when the tractor stops moving forward?

 

What would cause all this ? Could one of the pulleys be "Sticking"  or not turning properly at the higher speeds?

 

Ps; I tried to use sandpaper to lightly rub along the v channels of the pulleys .. but this does not seem to have any effect.. still slipping/whirring/clunking at anywhere above 2-3 speed selection (its a 7 speed model with a left hand side 7 speed selector lever on the dashboard, and the only pedal is a brake /clutch pedal on the left side of floor.)

 

Machine details : Troy Bilt Pony LT5

Model 13AN77 KG011    - Serial 1 F038H10601

Engine code : N   Tractor Series 770

Drive System: 7 Speed   - Deck Type 42" G

Brigs and Stratton Engine

 

Any help would be sincerely appreciated

 

Thank you.

 

 



#2 chieffan ONLINE  

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Posted August 20, 2016 - 09:13 PM

I would look the belts over real close.  Sounds like you have a belt or belts wore down to the point they are to narrow to grip the side of the pulleys.  Your motor should run at full throttle regardless of belt condition.  Sounds like dirt in one of the carb ports that won't let it run above 1/4 throttle.  Fix that first, then go to work on the other problem.  Also make sure you have the proper amount of fluid in the rear end.  Good luck.



#3 billingeorgia OFFLINE  

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Posted August 21, 2016 - 12:59 AM

Hello Thank you so much for your very kind reply...

May I just also mention.. the engine can be pushed all the way up to full throttle no problem, does not cut out etc.

But if engine speed / throttle is set to high, above say 3rd gear /speed setting ..that is when the tractor will stop moving.. engine still stays on .. does not cut off.. When this happens there id s high speed "whirring" as if a belt or pulley is spinning / or slipping and an  intermittent clunking I can feel below the driver seat.. ..as if the gears are trying to engage then disengage, 


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#4 petrj6 OFFLINE  

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Posted August 21, 2016 - 05:29 AM

    definitely seems like a belt issue as stated above, look at them very close and maybe just replace them.  while you have the belts off you can check all the idler pulleys and see if there are problems there.  your idlers should spin freely but not wobble or feel loose at all.  good luck with it.

                                                                                                                Pete


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#5 chieffan ONLINE  

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Posted August 21, 2016 - 06:49 AM

ptrj6 is probably correct. When you replace the belts be sure you use the Kevlar belts, not standard auto parts store FHP belts.  Check with our sponsors, several carry them or can get them. 



#6 VTXrider OFFLINE  

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Posted August 21, 2016 - 07:09 AM

Welcome to the forum.



#7 crittersf1 OFFLINE  

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Posted August 24, 2016 - 02:50 PM

:welcometogttalk: Bad bearing in a pulley?







Also tagged with one or more of these keywords: varispeed pulley, whirring pulley, slipping pulley, drive belt problem, drive belt, belt slipping, pulley slipping

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