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In reference to variable speed pulley on MTD garden tractors.

Customer Question
In reference to variable...
In reference to variable speed pulley on MTD garden tractors. Are there internal springs or parts which fail in these? With belts removed center section of pulley slides freely up & down. Should it be this way?
Submitted: 8 years ago.Category: Small Engine
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Answered in 22 minutes by:
6/27/2010
Technician: Curtis B., Technician replied 8 years ago
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 31,835
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Yes , there are no more parts, that is how it works.
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Customer reply replied 8 years ago
My transmission is good; replaced belts with exact width & length. When shift lever on left is advanced forward, front belt is loose and engine pulley slips inside belt. This problem occurred after being idle all winter. Any ideas? We will pay you.
Technician: Curtis B., Technician replied 8 years ago
First impression is that the belts are routed wrong. I went to web site to check but could not get your model number to come up. The belt should be under tension at all times and that has to happen by the spring loaded idler keeping tension on the belts.
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 31,835
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Customer reply replied 8 years ago
Belts aren't routed wrong
Technician: Ranwell1, Small Engine Technician replied 8 years ago
Ranwell1
Ranwell1, Small Engine Technician
Category: Small Engine
Satisfied Customers: 10,347
Experience: I Own a Lawn Mower Sales and service business (37years). Have 2-cycle and 4-cycle certification.
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The first thing that you have to know is that the belts that are used on these vari-drive systems are VERY SPECIAL belts and you cannot use regular belts of the same width and length. They are made especially to work with these systems. The regular belts CANNOT work on these systems.

 

You ,must use the EXACT OEM belts or you will be wasting your times.

 

If the belts are not the exact belts, the vari-drive will not work.

 

The other expert was partially correct with his answer, in that the variable pulleys have no other parts inside them. They just slide up and down like you said.

 

Also make sure that the idler pulleys are good and that the bearings inside them do not make any noise. If they make noise, the bearings are bad and must be replaced.

 

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