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Old 03-18-2019, 03:26 PM   #1
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Hyd Pump drive belt

Trying to locate correct part number for my Hyd pump drive belt, coach is 94 Monaco Executive with 300 cummins 8.3 eng, guessimated the size of this belt when I ordered it 7 years ago from V-Belt Supply (# 14-MGT-1190-37) belt was a little too long then but worked when adjusted to max. It is still in good shape but has stretched some over the years and can not be tightened anymore. Can't find a part number listing due to age of coach. Anyone had to replace one of these recently and have a good part number? V-Belt Supply says they can get or make the belt but need an original or working part number.
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Old 03-18-2019, 05:41 PM   #2
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Here is a link to Gates Poly Chain Belts
https://www.gates.com/us/en/power-tr...us-belts/c/120
The 4 digit number in the middle is the length. Try and estimate how much sorter belt you need (taking into account the adjuster) and see if you can find one that will work.
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Old 03-18-2019, 07:17 PM   #3
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I would try removing the top adjusting bolt and see if it will go back in (with the belt tighten) on the outside of the bracket. If so put a larger washer on the bolt and put off finding a shorter belt.
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Old 03-18-2019, 07:38 PM   #4
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Quote:
Originally Posted by Ivylog View Post
I would try removing the top adjusting bolt and see if it will go back in (with the belt tighten) on the outside of the bracket. If so put a larger washer on the bolt and put off finding a shorter belt.
Don't do that. Without the top bolts full clamping force, the pump could vibrate and crack the lower mounting brackets.
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Old 03-19-2019, 06:29 AM   #5
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Get your ESN (engine serial number) and go to

https://quickserve.cummins.com

and register your vehicle. It's a great source for info on replacement parts where you can find the correct part number for your belt.

You can call Cummins Customer Service at 1-800-343-7357
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Old 03-19-2019, 11:18 AM   #6
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I'm not sure this belt is a cummins part since it's not used on all cummins engine or even on all Monaco units. I think it's sort of unique to some RV's with rear side mounted Radiators.
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Old 03-19-2019, 11:44 AM   #7
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Personally I'd go to a local power transmission company, not the the electric company, but an industrial supplier that deals in belt and pulleys and so forth. They deal with this sort of issue all of the time, but take the old belt with you. Whatever you do fix it right as the damage from something breaking will probably be far, far greater than the money you save. I believe it say's you're from Ohio so I wouldn't think it would be hard to find such a supplier.
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Old 03-19-2019, 11:53 AM   #8
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Update-Was able to get hold of Monaco today, Gates 14 MGT-1190-37 is the correct belt, I guess mine has just stretched a bit over the past 8yrs of use. Thanks so much for your input and replies. It's new belt time.
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Old 03-23-2019, 07:46 PM   #9
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Purchased a new belt, ($235) that was a bit of jumping the gun on my part, but what the heck Dodo happens, I can return it, pulled the pump off and turns out both tabs on the pump that hold it to the mounting bracket are broken. Not sure if they can be welded or not. Replacement pump will probably be hard to find. Pump is Sauer Sundstrand with number 20161 on housing next to pulley and 40998 on back housing, took about 2 hrs to get pump off, at 79 I'm not as speedy as I use to be.
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Old 03-23-2019, 07:54 PM   #10
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There are a lot of specialty welding shops out there, I would remove Hydraulic pump and check with them, I'm sure they can do it especially if it is aluminum.
Good Luck
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Old 03-23-2019, 08:44 PM   #11
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Looks like a common pump mount.
Take it to a hydraulic shop and see if they have a new front section.

Take the 3 bolts out of the pully and screw them, evenly and gently, into the open holes, to push the bushing in and release it from the shaft.
Its a tapered bushing.
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Old 03-23-2019, 09:16 PM   #12
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Hyd Pump drive belt

I had the same issue on our 94 Signature.

Part numbers and more information are in this thread.

C8.3 hydraulic pump
C8.3 hydraulic pump

PM me if you have any more questions.

Paul
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Old 03-23-2019, 11:16 PM   #13
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Quote:
Originally Posted by pwhittle View Post
I had the same issue on our 94 Signature.

Part numbers and more information are in this thread.

C8.3 hydraulic pump
C8.3 hydraulic pump

PM me if you have any more questions.

Paul

‘95 dynasty w/8.3 here - thx for posting this info / link, much appreciated.
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Old 03-24-2019, 09:11 AM   #14
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Viewed pwhittle's info, look's like I have exact same pump, checked my area and there are 3 Hyd repair shops and 4 welding shops within 10 miles of me. Think I'll try finding and replacing the front pump plate as a 1st option if the price is right and go 2nd with welding since both pump mounting tabs are completely broken off. Will post the results.
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