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Willard

Belt alignment 312-8 with 37" mower deck

By Willard, in Implements and Attachments

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Willard    1

Willard
Posted

In 1987 I purchased a new Wheel Horse 312-8 with a 37” side discharge mower deck.  Two weeks ago the mower deck belt broke (belt was 5 years old).  After I replaced it, I noticed (for the first time) the belt comes off the inside adjustable “V” idler pulley at an odd angle to the inside groove of the PTO clutch pulley.  I cannot see a way to adjust the alignment of the belt.  Belt life has been good – maybe 4 or 5 years between belt breakages.  Could it have been manufactured like this and run this way all of these years?  With the pulley support cover in place, the misalignment is impossible to see.  I happened to notice it before I installed the cover.  It gets a little better as I remove the slack, but not much.  Any suggestions?  Is this normal?  Full disclosure – I had replaced the PTO clutch about 8 operating hours before this belt broke.

Belt alignment.jpg

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gwest_ca-(File Mod)    11,088

gwest_ca
Posted

Is that a 6-sided belt? There should not be a twist between the pto and the idlers for either style of belt.

Garry

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Willard    1

Willard
Posted (edited)

Yes, it is a six sided belt, WH #111178.  I believe I have it installed correctly for a 37" mower and the belt diagram you reference is for the 36", 42" and 48" mowers.  I used a magnifying glass on the instruction manual to verify where the twists are and have done it this way for years.  Also, I have two "V" Idler pulleys, not a "V" and a flat pulley, so I believe the belt should NOT have 2 90 degree twists as shown in the diagram.  However, that does not address my belt alignment issue - my problem is with the angle the belt comes off of the inside adjustable “V” idler pulley to the inside groove of the PTO clutch pulley. 

Edited by Willard

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gwest_ca-(File Mod)    11,088

gwest_ca
Posted

I don't know where you are getting the 36, 42 and 48 belt diagram. Click on the photo above. That is a service bulletin that was issued.

 

Garry

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Willard    1

Willard
Posted

Garry- My WH Mower Manual for 300 & 400 Series shows 36, 42 and 48 inch mowers have one V Idler and one Flat Idler and the belt having opposite sides touching the two pulleys.  For my 37 inch mower, the manual shows two V Idlers and the belt having the same side touching each pulley.  My Operating manual does not match the service bulletin.  But maybe the service bulletin corrects the Operating manual.  I will have to experiment with the belt installation.

However, my initial post concerns the belt alignment off the inner V Idler.  Any thoughts?

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daveoman1966    3,757

daveoman1966
Posted

The engine PTO belt MUST be on the INNER race of the PTO pulley.  Here is the schematic...

37 PTO.gif

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Willard    1

Willard
Posted

Dave - thanks for the reply.  The belt is in the inner groove of the engine PTO pulley.

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