B20 Plate Coupling

[Derek Barnicoat]

My B20 has destroyed the plate couplings (part of the Hydraulic Gear Pump - front, assembly item 120). I have a local fabricator who can make them for me, but I need to know what material to use. Help please.

 

[North Idaho Wolfman]

They are reinforced multi layer fiberglass composite done in a press.
Real good ones are made out of multi layer Kevlar.

Buy these and be done with it:

6 Kubota 32590-10850 Coupling Plates to Pump Drive Shaft

6 Kubota 32590-10850 Coupling Plates to Pump Drive Shaft used part for sale

www.eastern-triangle.com

 

[GreensvilleJay]

I've used conveyor belting on another color tractor for similar setup...
and a lot of old real garden tractors used similar material.
The 'rubber' has a little 'give' in it to flex .

I looked online parts and can't figure out if the $110 price is for all 4 pieces or if its each ? At $110 for the 'set of 4) I'd consider buying the set but not at $440.

 

[Derek Barnicoat]

My B20 has destroyed the plate couplings (part of the Hydraulic Gear Pump - front, assembly item 120). I have a local fabricator who can make them for me, but I need to know what material to use. Help please.

Thanks for the quick response. The reason I was using a fabricator was that I have been told that the B20 is obsolete and that (new) parts can no longer be obtained. I will ensure that the part numbers you have sent are correct for my unit and then contact you.

 

[fried1765]

They are reinforced multi layer fiberglass composite done in a press.
Real good ones are made out of multi layer Kevlar.

Buy these and be done with it:

6 Kubota 32590-10850 Coupling Plates to Pump Drive Shaft

6 Kubota 32590-10850 Coupling Plates to Pump Drive Shaft used part for sale

www.eastern-triangle.com

Apparently they are used, but it looks like a good deal.
From phone area code, seller is likely in Jacksonville, FL. area.

 

[GreensvilleJay]

hmm..used...
. can't tell if they're in 'good' shape...
it says 'make an offer', so offer 25, settle on 40, only$10 each

 

[Derek Barnicoat]

My B20 is an early version and needs part 76521-31510 rather than the 32590-10850. Does anyone know if the 32590 are near the same and could be modified to suit?

 

[PoTreeBoy]

I thought if mine ever go I'd cut some out of a soup can. or a tire, or a belt.

 

[North Idaho Wolfman]

Yes the plates are interchangeable.

 

[North Idaho Wolfman]

I thought if mine ever go I'd cut some out of a soup can. or a tire, or a belt.

I had a old Simplicity Garden tractor that used the same joints.
I made 4 different disks out of everything and all of them failed in short order.
The fiberglass has some unique operating properties, it can flex back and forth without failing.
It can also handle the shock loads.

 

[whitetiger]

I have been told that the B20 is obsolete and that (new) parts can no longer be obtained.

Most parts are still available. Coleman Equipment even has some of the plates in stock.

 

[lugbolt]

those original joints, was a wonder they lasted as long as they did. If they're still available, personally I'd go back with OEM. Just keep in mind that the shaft MUST be lined up properly, in other words use a dial indicator to align the pump with the shaft such that there is zero (or as close as you can get) misalignment.

as far as alternatives, I can't think of any-however a lot of cars use a rotary flex joint, aka "guibo" between the transmission and the driveshaft, which reduces transferred vibration. And these things often last a LONG time. Makes me wonder if that type coupling would work for this application, assuming you could get someone to make one to fit.

 

[Derek Barnicoat]

those original joints, was a wonder they lasted as long as they did. If they're still available, personally I'd go back with OEM. Just keep in mind that the shaft MUST be lined up properly, in other words use a dial indicator to align the pump with the shaft such that there is zero (or as close as you can get) misalignment.

as far as alternatives, I can't think of any-however a lot of cars use a rotary flex joint, aka "guibo" between the transmission and the driveshaft, which reduces transferred vibration. And these things often last a LONG time. Makes me wonder if that type coupling would work for this application, assuming you could get someone to make one to fit.

Thanks everyone!

 

[Dave_eng]

Thanks everyone!

I helped with the drive line repair of a TG1860. This flex coupling or the company Weasler that supplied it to Kubota may have what you need.

These instructions came with the Kubota part.

Dave

 

[Christian Babirad]

Do you have to pull the engine to pull the whole drive shaft out to repair this?