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Can you find a 490J6 Poly V belt locally?

NickD on Fri January 01, 2010 9:31 AM User is offline

It's a 49" long 9/16" wide 6 rib belt with ribs on 3/32" centers. Also called a BT-31 or a BT003100AV belt. Commonly used on a huge variety of air compressors.

Guess mine is 45 years old already, how time flies, no cracks, looks in very good shape yet, but did stretch a little. Only had another 1/8" to move the motor back, can hit 150 psi again, but know that I am going to have to replace it. Tried every hardware and building supply store in town, no didn't drive, just called them. All over the web to order, but they want an arm and a leg for shipping this 2.4 ounce belt. Couple of bucks should more than be enough, general rule is the cheaper the belt, the more they charge for S&H. all prices come to around 21 bucks for what should be a 8 buck belt.

Just hit all the stores in town that sell air compressors, will sell me a brand new made in China air compressor, but didn't check with my local auto suppliers yet. Really don't know if this belt has an automotive belt, all serpentine belts look alike to me, just a zillion different sizes, but they will probably ask me the year, make, and model, what size engine, AT or manual, and does it have AC or not.

Just trying to save a couple of bucks so I can send that money to Obama and Doyle.

bohica2xo on Fri January 01, 2010 3:32 PM User is offline

Try this:

Belt cross reference

If the pitch is .140 or so, it is a standard automotive belt. That would be a 490K6 or equal. The fine pitch is industrial for the most part, some automotive and lawnmower applications.

A 490J6 would be the fine pitch number:



Autozone / Pep Boys / etc. rack the belts by size, and can usualy just get you a belt by size.

490J6 Belt for MTD

Try the lawn mower shops, etc. for the 490J6 belt. Or buy it direct.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

Edited: Fri January 01, 2010 at 3:38 PM by bohica2xo

NickD on Fri January 01, 2010 5:11 PM User is offline

Belt at that site is only five bucks, but

Final Estimate/Analysis:
Shipment Weight:6.3 LBS
Total Line Items: 1
Ship-to postal code: 54449
Shipment Cost starts from: $12.84

Maybe I should find something else they have that I need. Also their belt is heavy.

bohica2xo on Sat January 02, 2010 2:46 AM User is offline

Well, like I said you could try the local mower shops & the local chain auto parts store.

Freight is not cheap. I recently had a customer that reeeeealy neeeeded a part I had on hand. Insisted on UPS red label service. Part weighs about 9 ounces. By the time you get it into a box with some bubble wrap, it barely crosses the 1 pound mark - that makes it "2 Lbs" to UPS. It cost 42 bucks to send a $140 part. He whined about the price, said he weighed the part @ under a pound. Wanted to chisel on the freight, after he got the "only one in the country" shipped overnight. Last time he ever gets anything from me.

If you can't find the part locally, see if a local mower shop can order you one for an MTD. The inbound freight will be spread across a larger order, and they might not charge as much.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

NickD on Sat January 02, 2010 5:36 AM User is offline

LOL, thinking about putting a tensioner pulley on it. Also have to consider the price of gas and car cost, at 50 cents a mile, 12 bucks will only get you 24 miles.

NickD on Sat January 02, 2010 11:06 AM User is offline

Interesting, that KSC sells Micro Goove Sheaves. Do have a data sheet on my compressor and can handle a five HP motor for more cfm output. Also have a single phase 240 VAC 5 HP motor laying around, all I needed was a smaller sheave for greater rpm.

Now if I can make heads or tails out of their specifications for the different size sheaves they sell, like ID and OD of the sheave. ID to fit my motor shaft, OD to determine the speed I need. I think they sell the collets separately.

NickD on Thu January 14, 2010 12:33 PM User is offline

Found an outfit to sell me the belt for seven bucks with three bucks shipping, a good quality belt and see my old one really stretched out. Elected to pull the motor and take it apart for an inspection, some corrosion on the brass spade lugs, centrifugal contacts were actually in very good shape as was the starting capacitor, checked out perfectly on my bridge. Also use my shorted turn test on the stator windings, excellent. Recalled repacking the ball bearing years ago with Wolf's Red bearing grease, still nice and and clean with smooth rotation, so left that.

Is a 2 HP Doerr motor out of business a long time ago and was made right in Cedarburg, WI, serves them right for making a quality product that lasts a long time.

Compressor is fixed, can move the motor sheave in and out for perfect alignment, but the motor is held in with four 5/16th" bolts from the bottom with flat washers and nuts on the top. What I can't seem to remember is how I properly tensioned the belt, is kind of loose now, but really no way to pry that motor back. Need a wrench under the motor pan to keep the bolt from turning, another on top to tighten the nut not leaving any hands free to pull the motor back. Maybe I had help and can't remember. Or maybe I had three hands back then and lost one.

bohica2xo on Thu January 14, 2010 2:11 PM User is offline

Two pieces of wood & a jack bolt between the sheaves.

Gives a nice straight tension on the belt, and you can use the tension gauge before you lock the motor in place.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

NickD on Sat January 16, 2010 5:44 AM User is offline

Think I tried that once, motor is not on a pivot like an alternator and tends to skew one way or the other. Think what is had to do was just tighten a couple of bolts so the motor could still be tapped into place, loose enough so it could be moved, but not tight enough so it can, but tight enough so it stays there until I can final tighten the bolts. They sure didn't make it easy.

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