Purchase a good used belt assembly from a salvage yard.
I just unflipped my rear seat belt today using the steps on the related link below.
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It is the rear most belt.
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The easiest way I found was to remove the belt from all the pulleys stand the mower up on the rear wheels then squeeze the belt through the rear axle and engine pulley
Remove belt cover from left side of engine . If you remove the screws that hook rear fender to foot rest the cover comes off easier . Then take out bolt in center of rear clutch assy . Slide rear clutch off and remove old belt .Install new belt in reverse mannor .
Remove the rear wheel and belt covers. Remove old belt. Check numbers on new and old to be sure of fit. thread new belt through front pulleys and over rear wheel pulley. Get rear axle ready and depress belt tension-er while somebody slides in axle bolt and secures. Release tension-er and reinstall covers.
You might try accessing the seat belt from the trunk. Pull aside the interior lining in the trunk ( which ever side the belt is on) and find the seat belt, give a gentle tug and see if that will release the belt. Mine does the same thing when the kids pull too far on the belt. If I took the time to investigate I'd probably find that the belt has been twisted and that's why it keeps getting stuck.
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A bad universal joint A rear tire out of balance A rear tire with belt separation
A belt could be squeaking for several reasons. It might be too tight. It could be rubbing the tire if a wider than stock tire has been installed. The belt alignment could be off (the front and rear pulleys must be aligned). The belt or one of the pulleys could have excessive wear and need to be replaced.
The spring clips onto the gearbox, which is found over the end of the belt pulley inside the plastic rear baffle. The gear box is sits on the wheel drive shaft and is not fixed to the mower frame, so it has some twinting movement. The spring clips to the gearbox and to the rear plastic frame and pulls the gearbox in the opposite direction to the belt. This small amount of tension is sufficient to allow the belt to engage and drive the wheels. If you wheels will not turn it could be this spring has broken or stretched but it could also be that the clutch cable (linked to the black handle) has stretched or your belt has broken or stretched. If you are sure it is this spring that needs replacing then it is tricky to access and you need to at least turn the mower upside down to access. Drain petrol and oil first and disconnect the spark plug lead also. If you cannot find the attachement point then you may have to remove the gearbox, or if you need to remove the gearbox, this is done by removing the wheels, then the drive cogs. Be careful as there are small pins and drive bits inside the cogs. The gearbox removeal is a relatively tricky job and may be better lest to the experts or an experoenced home mechanic.