belt sizes again

[38racing]

I need to replace drive belt on my kubota t1400H. number is 66071-5152-0. found several belt sites saying it's 5/8 x 81. Found a forum that said 78. I should have measured old one before ordering the new one. Turns out old one measured 79 but also only .54 wide. new one was 81 but surprisingly it's only .60 , not .625. Anyway it's clearly too long. I have a B75 that should be 78 but it's 77.5 and just won't quite go on.

[KE4AVB]

I assume you know there is two different drive belts based on SN or at least Kpad indicates this. There seems to be possible gray area in the SN ranges.

66071-51520 <=42962
66071-52560 >=50001

[38racing]

I assume you know there is two different drive belts based on SN or at least Kpad indicates this. There seems to be possible gray area in the SN ranges.

66071-51520 <=42962
66071-52560 >=50001

Actually I was confused because some IPLs showed those 2 numbers both for 050 on the diagram but some only showed the 51520. I missed the comment on serial number break, please call.Only sticker is a big white one near drive pedal. Says 37742. If that's the serial then 51520 is the belt but if it's 81 it's too long. I didn't actually put the idler pulley assembly back on because it just seemed that it could not take up the slack. I can't find a size anywhere for the 52560. vbeltguys had the size for the 51520 at 81 but they don't even list the other one. ditto for outdoorpowerinfo 81 for the one , no listing for the other.

[38racing]

I'm going to measure outer diameter of both pulleys and centre to centre and see what the belt size calculator comes up with as a snug belt. 3 inches take up for the idler seem too much to me.

[KE4AVB]

It won't be the first time for anyone to do this. Miss information and wrong specs is more than we think. We trust the manufacture is right but they are not always. I got MTD 46" decks here that calls for 1/2 x 103 deck belts but they require a 1/2 x 102" to work properly.

It kinda sounds like ran into one those cases where the OEM changed a pulley size but never noted it requires a different belt, I ran into a JD where they did that but for some reason they noted the wrong serial number break. It was an inch shorter than what they said was the right belt.

I don't many Kubota mowers here; although, I got a ZG222 now with an engine problem. #1 60% leakage #2 20% leakage. I going need to pull the heads. How in the heck it was running I don't know. I hoping valve stem seals or head problems.

[38racing]

It won't be the first time for anyone to do this. Miss information and wrong specs is more than we think. We trust the manufacture is right but they are not always. I got MTD 46" decks here that calls for 1/2 x 103 deck belts but they require a 1/2 x 102" to work properly.

It kinda sounds like ran into one those cases where the OEM changed a pulley size but never noted it requires a different belt, I ran into a JD where they did that but for some reason they noted the wrong serial number break. It was an inch shorter than what they said was the right belt.

I don't many Kubota mowers here; although, I got a ZG222 now with an engine problem. #1 60% leakage #2 20% leakage. I going need to pull the heads. How in the heck it was running I don't know. I hoping valve stem seals or head problems.

funny those exact sizes are an issue with my late 90s mtd snowblower attachment. Tech bulletin switched belt number and size but mtd is now marketing the new belt with the old size.

[KE4AVB]

Now that can be the problem as OEMs don't want to publish their belt sizes as they don't want to give up the gravy money. Then years later they screw up by changing back to some old internal spec without researching why the belt were initially changed.

We for very reason need to know the exact belt used as too many users just throw an auto parts house belt on the equipment as a will fit option and because they are cheap.

[38racing]

Someone left a jd L100 at our church scrap dumpster. It had a flat auto serpentine belt on the deck.

[SUKI]

What do you expect when JD lists the belt as follows. and I have too someone to try a flat belt because of this.

[38racing]

So I decided to try the 79 inch first. I was concerned about the clip holding idler arm. So I back away from shop and turn to go on lawn. Slight upgrade. Does not want to go. I turn around and back on to it. I end up on lawn but have to baby it up a grade back to garage. I then thought maybe idler arm dropped off. I shut it down and look under it. Arm in place but with my attention on clip I had forgot to engage idler pulley on the belt. It now seems to work fine with the 79. Interesting is that I now just bought 3 new rotary 5/8 belts. All measure .600 wide.