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