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Engine runs but tractor won't drive. Changed belt but seems too little tension on belt. What next?

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Check your idler pulleys especially the plastic v--belt versions as they do wear out rapidly on some mowers. Once worn out just replacing the V-belt just don't do it.

Posted on May 02, 2015

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Double check the model # of the belt just in case you put on the incorrect one.

Posted on May 02, 2015


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We have a HXL 16hp with 44 inch cut, all the belts have been checked and changed but we are unable to get forward or reverse. Any ideas what our problem could be or what we could check next?

If hydrostatic drive make sure you don;t have the transmission in bypass mode. It is that little lever that allows you to push the mower around when the engine is not running.

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John deere 855-70 manual

On ALL Deere riding lawn mowers, 1st, position the deck under the tractor. Depending on the belt drive: either PTO (the yellow button on the dash panel), or tension engaged-(a lever on the right side of the operator\'s seat), you loop the drive belt from the front of the deck to the pulley, always in the lower front area of the tractor\'s engine. If it has "beltguards" too close to the pulley, you must loosen the retaining bolt for the guard, it will allow the belt to squeeze by and onto the pulley. Then, 2nd but don\'t forget to retighten after slipping the belt on, push the "Deck heighth" lever fwd to drop the deck "hangars" at the rear of the deck into position to "pin" the eyelets with the supplied pins, washers and keepers: usually a cotter pin or a lynchpin that inserts thru a hole on the smooth bolt-pin. The easy part\'s over, but don\'t panic. 3rd, lift the front of the deck onto a block, allowing a heighth to apply the "adjusting rod" into the front of the mower chassis. Screw the retaining nut onto the threaded (long bolt) and remove the block. You\'re done. Next, and very important, RAISE & LOWER the deck, engage the belt tension, (here you may have to clear the area and start the engine to engage the PTO drive, if it\'s electronically controlled belt-drive), this assures nothing is "misaligned" or improperly positioned. Now, if the machine is on a flat surface, lower the deck to a point just above the ground and measure the distance in four (4) corners of the deck and record the ht. Make the adjustments to LEVEL the deck. Now you\'re ready to start the engine from the operator\'s seat, slightly increase the engine from idle to 1/4 throttle speed so that engaging the drive belt won\'t kill the engine. Ensure the belts run smoothly, the blades turn, and the engine doesn\'t "bog". Lower the deck to a desired cutting ht., now MOW the grass!

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1 Answer

LA105 mower won't move when put into gear

Is this happening in all gears or just one? Is the motor bogging at all. If not chances are the problem is in the drive belt to the transmission or in the transmission itself. Check to make sure you are getting it into gear. you should be able to feel the transmission hit a notch for each gear. If you can't, chances are the little module in the top of the trans that sets the gears has broken and needs to be replaced. Often these get sticky before going bad. If the motor is running normally though, it's not the engine, it's drive belt or transmission. with the mower off, you can check the drive belt tension by simply having the clutch pedal in the out (drive) position. In that position the drive belt should be tight enough that you really can't slide it in either direction without causing motion on the motor pulley. If it has slack in it, then your clutch is probably out of adjustment or your drive belt has stretched beyond it's working life. Have you smelled burning rubber at all.. if so the belt is probably slipping. If not, it's more likely that it's in the transmission.

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1 Answer

I am trying to replace the drive belt on a Husqvarna YTH1542XP lawn tractor (Kawasaki engine) with the correct OEM belt ( 532 14 02-94) and am doing something wrong as it just doesn't seem to fit. The user...

Based on my experience with a 2148, I suggest the following. The pulley on the transmission may have a guide/keeper at the back which is hard to see. Make sure you are getting the belt inside it and thus in the pulley groove. The engine pulley on the other hand has a very hard to see guide on either side, make sure your belt is running within them hence also in the groove and not outside. I had a real mower tech replace my drive belt and return it too me with the belt on the outside of one guide and it would only move in reverse. Lastly have someone hold the brake pedal down, which relieves tensioner pressure, as you put the belt in place. Movement of the pedal up and down, will move the tensioner in and out and you should be able to see where your problem arises.

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1 Answer

I have the same ,Sears Kohler tractor won't pull uphill

Have you checked the fluid level in the hydro trans, there is a drive belt from the engine to the hydro trans check and make sure that this is not worn or loose. Make sure that when you check the tension of this belt that you do not have the engine running or the parking brake set, since tension will be released from the belt when parking brake is applied. good Luck

Oct 07, 2009 | Craftsman 20 hp 42 in. Deck Lawn Tractor -...

1 Answer

Belt tension for Roper Lawn Keeper tractor

These belts don't really stretch, they just wear down on the inside where they contact the pulleys. If you use the same length new belt you should be good. hope this helps

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1 Answer

When deck is lowered blades do not engage

Is the belt in place that drives the blades?
Is the belt at the correct tension?
With the mower engine off.....try to turn each pulley the belt drives and on the mower deck with the mower in up position and or they turn a little......this is to check for a seized bearing on one of the pulleys also look under the deck for something stuck........ jamming a blade.
Also check for the mower belt safety system (which stops the blades quickly when disengaging them) that may be stuck in stop mode.
With the mower engine running.....have some one engage the blades while you look under at the belt the engine driving the the belt driving the blades.
DO NOT TOUCH ANYTHING......MOVING OR STOPPED while the engine is trying to drive the blades.

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1 Answer

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1) check condition of deck drive belt

2) check condition of belt tensioner system located on top of the deck.
tensioner system pivots and also applies brakes on spindles
being worn, it does not give full travel to tension the belt

3) make sure engine mount bolts are tight

4) engine 'Stack Pulley' groove can be worn

5) check idler pulley bearings

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1 Answer

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No power when drive is engaged

Check your drive belt and the tensioner pulley that holds tension on the drive belt. Its possible for the tensioner pulley to be sticking and not putting enough pressure on the drive belt causing it to slip.
Grab hold of that tensioner pully and make sure it moves in and out freely against the drive belt.

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