Belt slipping have tried to tighten, just bought used

some thing on the pulleys are off aligment

Make sure you adjust vthe motor belt first, it may be where the slipping is coming from. You should only be able to twist a properly tightened motor belt 45 degrees. After that, readjust the walk belt. If you have been tightening the walk belt trying to get the slipping out it may be too tight now. Use the instructions in your owners manual to adjust the walk belt. Also, lube under walk belt with the recommended lubrication . That will help the walk belt not too grab and take pressue off of both belts. Good luck

Do you know if you are tightening it correctly?
Both bolts at the back of the walking belt should be turned clockwise to tighten the belt. You must also tighten the bolts the same amount and typically no more than 1/2 turns at a time. I usually adjust belts while the machine is running at approx 3 mph. Your belt should be just tight enough to not slip when you walk on it. If its too tight you'll wear out the motor bearings.

This could be 1 of 3 things. Either the walking belt need to be tightened, or the rubber motor belt is slipping (under the front hood) or the pulley has come loose from the roller.
First tighten the walking belt using the allen key provided when you purchased the machine. Locate the 2 adjustment bolts at the back of the machine and tighten (clockwise) both bolts 1 turn. Retry the machine. If there is no noticeable difference, remove the hood and see if the rubber belt is slipping. If so tighten the belt by adjusting the motor.

Make sure that what is really slipping is actually your runbelt. Alot of times it's actually your motor belt. Hope this helps.

good evening. I would suggest checking the tine bearings as well alignment. I had (have) a 2003 mtd rear tine which blew the entire bearing box for the second time. The times should have little to no flex when push or pulled. Fortunately, MTD came good for the first rebuild even though my warranty had expired...they covered the parts and labour was all mine. If the tines seem properly working, possibly try out this website to get the 100% correct belt....hope this helps.

http://www.milacalawn.com/parts.asp

This is caused by one of three problems. First and most likely, the walking belt is loose. To tighten the belt, start by locating the two bolts that adjust the rear roller (one on each side of the unit in the back). Run the unit at about 3 mph. Tighten the bolts a 1/4 turn at a time. Make sure that what you do to one side, you MUST do to the other side or the belt will get off center. After you tighten it 1/4 turn, check the belt to see if it is still slipping. If it is then tighten the belt 1/4 turn again. Continue until the belt does not slip, but do not tighten the bolts more than 2 full turns. If it takes more than 2 turns then something else is the problem. The second problem that it could be is the drive belt might be loose. To tighten the drive belt, start by removing the front cover. loosen the bolts around the motor then tighten the drive belt by tightening the motor adjuster bolt. Once the drive belt is tight, tighten the motor back down. The third problem that it could be is the walking belt could be worn and need to be replaced. Let me know if you have any questions.

This is caused by one of three problems. First and most likely, the walking belt is loose. To tighten the belt, start by locating the two bolts that adjust the rear roller (one on each side of the unit in the back). Run the unit at about 3 mph. Tighten the bolts a 1/4 turn at a time. Make sure that what you do to one side, you MUST do to the other side or the belt will get off center. After you tighten it 1/4 turn, check the belt to see if it is still slipping. If it is then tighten the belt 1/4 turn again. Continue until the belt does not slip, but do not tighten the bolts more than 2 full turns. If it takes more than 2 turns then something else is the problem. The second problem that it could be is the drive belt might be loose. To tighten the drive belt, start by removing the front cover. loosen the bolts around the motor then tighten the drive belt by tightening the motor adjuster bolt. Once the drive belt is tight, tighten the motor back down. The third problem that it could be is the walking belt could be worn and need to be replaced. Let me know if you have any questions.

This is caused by one of three problems. First and most likely, the walking belt is loose. To tighten the belt, start by locating the two bolts that adjust the rear roller (one on each side of the unit in the back). Run the unit at about 3 mph. Tighten the bolts a 1/4 turn at a time. Make sure that what you do to one side, you MUST do to the other side or the belt will get off center. After you tighten it 1/4 turn, check the belt to see if it is still slipping. If it is then tighten the belt 1/4 turn again. Continue until the belt does not slip, but do not tighten the bolts more than 2 full turns. If it takes more than 2 turns then something else is the problem. The second problem that it could be is the drive belt might be loose. To tighten the drive belt, start by removing the front cover. loosen the bolts around the motor then tighten the drive belt by tightening the motor adjuster bolt. Once the drive belt is tight, tighten the motor back down. The third problem that it could be is the walking belt could be worn and need to be replaced. Let me know if you have any questions.

This is caused by one of three problems. First and most likely, the walking belt is loose. To tighten the belt, start by locating the two bolts that adjust the rear roller (one on each side of the unit in the back). Run the unit at about 3 mph. Tighten the bolts a 1/4 turn at a time. Make sure that what you do to one side, you MUST do to the other side or the belt will get off center. After you tighten it 1/4 turn, check the belt to see if it is still slipping. If it is then tighten the belt 1/4 turn again. Continue until the belt does not slip, but do not tighten the bolts more than 2 full turns. If it takes more than 2 turns then something else is the problem. The second problem that it could be is the drive belt might be loose. To tighten the drive belt, start by removing the front cover. loosen the bolts around the motor then tighten the drive belt by tightening the motor adjuster bolt. Once the drive belt is tight, tighten the motor back down. The third problem that it could be is the walking belt could be worn and need to be replaced. Let me know if you have any questions.