Wheelhorse 312-8 axle pullley

[Caleb Jones 0]

Has anyone ever put a 4 inch pulley on the transaxle of a wheelhorse 312-8? I seem to struggle to find the right belt size. I believe the Kohler motor has a 4 inch and there was a 6 or 6.5 on the transaxle. Im thinking I need  a79 inch belt but I'm not sure. Does anyone know?

[Ed Kennell 42,468]

to the   Caleb

 

If your 312-8 has stock engine and transmission pulleys it should take a 5/8X82" belt.

If you want to increase the tractor speed by replacing the stock 7" pulley with a 4"pulley a shorter belt and possibly belt guard modifications may be required to permit proper belt stopping for gear shifting.         

 

I buy all my belts at TSC.    If they don't fit, you can exchange them for the correct belt. Just keep the belt and sleeve clean for a full refund.

 

 

Edited yesterday at 09:36 PM by Ed Kennell

[oliver2-44 10,830]

3 hours ago, Ed Kennell said:

to the   Caleb

 

If your 313-8 has stock engine and transmission pulleys it should take a 5/8X82" belt.

If you want to increase the tractor speed by replacing the stock 7" pulley with a 4"pulley a shorter belt and possibly belt guard modifications may be required to permit proper belt stopping for gear shifting.         

 

I buy all my belts at TSC.    If they don't fit, you can exchange them for the correct belt. Just keep the belt and sleeve clean for a full refund.

 

 

[JoeM 8,539]

Someone here had some kind of homegrown formula for every inch of pulley subtract 2 inches of belt???? It was a long time ago when i seen that thread and not sure if it is even accurate. 

[953 nut 60,893]

2 hours ago, JoeM said:

homegrown formula for every inch of pulley subtract 2 inches of belt????

The diameter of the pulley multiplied be 3.14 will yield the circumference of the pulley but the belt generally only contacts half of the circumference, SOOOOOO, for each inch of pulley size change the belt would be 1.57" longer or shorter as the case may be presuming both pullies are relatively close in size. If you were going from a 2" to a 12" pulley that formula would be out the window because more than 50% of the 12" pulley circumference would probably be contacting the belt.

With any luck this will clarify rather than confuse the issue. 

[Handy Don 14,254]

Being a nerd and enjoyer of math, I have collected links to quite a few online calculators, including this one for calculating a belt length around three co-planar pulleys. 

Of course, with an 8-speed, you have to choose the dimensions of the idler/clutch pulley carefully to a position between fully engaged and fully disengaged.

Enjoy!

[Ed Kennell 42,468]

This thread may be of some help in understanding how the clutching system works on these tractors.

310-8 Clutch Problem - Page 2 - Transmissions and transaxles - RedSquare Wheel Horse Forum

 

Decreasing the size of the transmission input pulley may have an effect on the belt brake and the clutch damper.

Please be aware the belt must not be moving to engage a gear.  Do not force it in gear with the belt or the tractor moving as the grinding will cause serious damage to the gears.

 

Edited 1 hour ago by Ed Kennell