4" "Speed up" Pulley Question
 

Hello all. I have a 129 with a 44" deck and want to install a 4" pulley
to replace the 5" . What size belt would this require ? What would
the IH part number be ?

Thanks in advance .

Hydrocub

I'm not feeling the love here ... sniff , sniff

I don't know that IH ever made the "speed up" pulley set for this deck. I have heard of their existence, but can't find any info in any of the parts books. If there is such a thing, it would have either been an afterthought and may be a reference in a SB, but it didn't make it into any books. I think they were all "custom made". You may be on your own.

I assume your using a 44a? Should be the same belt as used for the 50a in this post from a few days ago. Overdrive Pulley

Bill

Thanks guys ... I feel better now . Berwil , thanks for the info . My thinking
is that of Bedell in that if you are going an inch smaller in pully diameter
one would need to decrese the belt size by one inch . J -Mech , a few guys
on here have gone to a smaller pully on this size deck and have been
happy with the results of a faster deck speed . The 4" pully is an IH part,
just not not advertized as an option .

Thanks all,
Hydrocub

That is correct.......:ThumbsUp:

Like I said, I am aware of the pulley's existance, but not their origin. Roland also confirmed that they are not IH. If you think they are, then get us a part number. I'm certain you will find they are not IH. Mathematically speaking, the belt will need to be more than 1" shorter. You guys all realize that you by going to a 4" pulley from a 5" pulley you are increasing the RPM by 720RPM right? :bigthink::bigeyes::bigeyes::bigeyes: That's a LOT! Better watch it! I think your asking for trouble. Just my :TwoCents:

Mine has the 4" pulley. I get a better cut and discharge. I love it.

There's no doubt in my mind that that is true. But anytime you increase speed by that much...... WOW. I'm sure the bearings are made for that much speed, but are the spindles? How about that big center blade?.... It's been a while since I've used one of those old deck, but I never thought they were all that bad as a stock set up. Oh, sure, the newer style decks do a better job. But really all you are doing is making it so you can increase your ground speed. Again, just my two cents.

So far mine has been like that for four years now. Mowing 3/4 acre. I have yet to see any negative side effects. If there is any I would love to know what to keep a eye out for,