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Vbelt Problem

T

Texasmark

Well-known Member
Replacing a fan V belt on a tractor.

Look up spec in parts list and get new premium belt; not wrapped but still too fat to go all the way into the sheave groves......sticks up over the edge. As a result and due to the large diameter of the crankshaft and fan pulleys, can't even get alternator mounted. Checked the grooves on the tractor and they aren't clogged.

How do you order a new fan belt of a given dimension and know that the angle of the V matches the angles of the sheaves?
 
most used a separate belt for the alternator/generator As for the vee angle unless it is something special don't know unless you took some modeling clay and packed in there to make a form to compare with or measure the taper . Could also cut a template from cardboard or wood to fit for a measurement.
 
(quoted from post at 07:48:46 07/08/23) Replacing a fan V belt on a tractor.

Look up spec in parts list and get new premium belt; not wrapped but still too fat to go all the way into the sheave groves......sticks up over the edge. As a result and due to the large diameter of the crankshaft and fan pulleys, can't even get alternator mounted. Checked the grooves on the tractor and they aren't clogged.

How do you order a new fan belt of a given dimension and know that the angle of the V matches the angles of the sheaves?
Click to expand...

Are you using a cross reference or just trying to match numbers? Are you ordering a letter series belt, like an ''A'' belt or an actual automotive belt? The letter series have different angles and widths than automotive belts. I would start by finding the original part number, cross it, using a cross reference, then adjust length as needed using the original belt specs as the basic for type, width and angle. Until a cross is proven correct, they should be treated as guides. A new belt may set a bit ''proud of the top of sheaves.

What tractor and engine? All original equipment as far as pulleys, including generator/alternator?
 
Wow that was a quick reply. I do most of my shopping online so measuring would be a problem. Since you said some OEMs use a special belt for that the one currently installed didn't seem to have anything to suggest it was a HD belt. Maybe I need to go to the Case-IH site and order an OEM.
Thanks
 
A cloth measuring tape works to get a measurement around the outside of the pulleys. Then you need to be sure you are looking at outside length, not effective length, when you look at catalog specs.

Most engines have used automotive belts for years, so if you are using the letter series belts intended for fraction horsepower, implement, industrial use, etc., is going to be incorrect to start with. JMHO.

This post was edited by Jim.ME on 07/08/2023 at 05:11 am.
 
I put the OEM number in a search engine and came up with a length and width. First off I went to ebay and they had
numerous listings of the OEM part number and stated several X95 series Case-IH tractors they fit.

I Was installing a new alternator that matched the dimensions (I measured them side by side) of the old one other
than the diameter of the pulley was smaller.....which should have helped,

Since I was in the middle of changing the alternator and decided that I didn't want an old belt with a new alt., I
stopped work, went to town and bought a premium auto parts belt matching the 1/2 x 60.25 dimension. It wasn't
wrapped, just cut on the sides.

The tractor is a Case IH 395. I have a full set of manuals for it and got the OEM part number out of the parts manual.
Thanks
 
I always have a old belt I can cut in half and use that to wrap around the pulleys and mark the length. I have a couple different widths in case it doesn't fit the pulley correctly. Them just lay it flat and measure from the end to the mark you put on and that's the length you need. (Make sure you have a marker other than black)
 
I compared the two belts best I could in getting the ends stretched so that the curvatures would be equal and the belt
I got was almost identical in length.....the new belt was actually stated as a tad longer (forget the number) than the
old, stretched, OEM spec as a matter of fact. The belt sits probably 1/16th of an inch above the OD of the sheave.
 
I have done that before but had no idea that I was going to face this problem when I bought the belt.
Thanks
 
(quoted from post at 06:48:46 07/08/23) Replacing a fan V belt on a tractor.

Look up spec in parts list and get new premium belt; not wrapped but still too fat to go all the way into the sheave groves......sticks up over the edge. As a result and due to the large diameter of the crankshaft and fan pulleys, can't even get alternator mounted. Checked the grooves on the tractor and they aren't clogged.

How do you order a new fan belt of a given dimension and know that the angle of the V matches the angles of the sheaves?
Click to expand...
he part number for fractional horsepower belts is very easy to dissect. The first number is the width at it's widest point in eighths. So a 1/2" belt is 4. The letter designation for fhp belts is L, which is a defined height and angle. The length is next. A 410 would be 41.0 inches. So a 4L375 would be a 1/2" belt 37.5 inches long. Many manufacturers and retailers have their own part number system, but this system is used for cross referencing by everybody.
 
This may be what you have, or it may help. I looked at the online parts book for a 395 and found the (1) fan belt for an open station tractor, as you said belt, not belt set, which they call for with a cab.

I found part number Case/IH # 3129140R1, which gates crosses to either a 9610 or a 9610HD. Specs for both are posted below. They are slightly different but either belt should work if the cross is correct. The HD is a bit wider top width and longer in length. I use the HD series if available when I get them for other tractors.

It is possible for a new belt to set a bit proud of pulleys that are not excessively worn.

mvphoto107398.jpg


mvphoto107399.jpg


Edit: added the specs


This post was edited by Jim.ME on 07/08/2023 at 05:38 am.
 
The original spec of 3129140R1 is 12.7mm wide, 1544mm
outside circumference, 9mm thick, 38deg included angle.
Was a Goodyear 1251544, but that doesnt appear to be a
good number, may not have been a retail number.
 
(quoted from post at 05:14:49 07/08/23) I compared the two belts best I could in getting the ends stretched so that the curvatures would be equal and the belt
I got was almost identical in length.....the new belt was actually stated as a tad longer (forget the number) than the
old, stretched, OEM spec as a matter of fact. The belt sits probably 1/16th of an inch above the OD of the sheave.
Click to expand...

Does the old belt still fit?

Also, belts don't stretch. I don't care what anyone says. The dealer has countless times sold us belts an inch or two shorter by matching up because "they stretch." They NEVER fit. ALWAYS too short. We tried to tell them but oh no this is the one you need, because, they stretch. Obviously we only dealt with them when absolutely necessary but unfortunately they were the closest dealer with a good stock of belts. They just couldn't match them up to save their lives.
 
Belts, don't really stretch, at least modern belts don't, they do wear out which makes it seem like they stretche. Your belt dilemma was already explained, but if you want a better appearing fit, then use the std 9610, not the HD.
 
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