[bulldogbones]

Hey guys as alot of you know I put a diesel into my case 446

http://www.mytractorforum.com/showthread.php?t=219907

Well I took a look at the love joy and somthing must not be ligned up correctly or its just not up to the rattle and shake of a diesel. The Love Joy fingers have worn through the rubber spacer and have worn 2/3 into the opposing fingers.

So I need a new coupler idea. I was thinking somthing like this, but im not sure it would work and im not sure they make one small enough.

 

[wally2q]

a rubber coupling, and a universal joint are 2 different things, used for 2 different purposes.

if your coupling is wearing too quickly, it basically means it's misaligned. that coupling should be almost "perfectly" aligned to work properly and not wear prematurely. it wil help with vibration and minor frame flex issues.

the universal will work if you have to change the angle of the power drive. 2 universals with a short shaft in between can fix more significant shaft misalignments.

cheers and good luck

 

[mrolds88]

You might want to look at the coupling itself. Most lovejoys aren't rated for a lot of Hp or Torquew. With the way a diesel stresses the drivetrain (in particular when it fires) that adds to the torque issue. Now, I presume that the crank and driveline are aligned properly. My idea would be to use an automotive style coupler. I know that one of the European companies used them in the 50's-60's. Look at Renault, Peugeot and Fiat. I had some trannies off of one of those brands a while backThey were built similer to the lovejoy, but bigger. Picture a rubber disc with 7 holes in it. 1 in the center and 6 in a circle. Then a drive plate that ha the center splined to fit the trans output shaft and 3 pins for the coupler. The driven pin was similar. i will see ifd I can locate some pics.

 

[Kbeitz]

Look into Zero-Max . They make a coupling for shafts that dont line up.

http://www.zero-max.com/flexible-shaft-couplings-schmidt-couplings-c-1_8-l-en.html

 

[OldBuzzard]

... So I need a new coupler idea. I was thinking somthing like this, but im not sure it would work and im not sure they make one small enough. ...

You might checkout a Bolens universal.

They used two types. One is a 15 spline at each end used on the Large Frames, and the other is 6 spline at one end and 3/4 x 7/8 on the other which was used on the Tube Frames.

You would probably have to modify them a bit.

http://www.ebay.com/itm/BOLENS-QUIC...954?pt=LH_DefaultDomain_0&hash=item4156fa8942

http://www.ebay.com/itm/BOLENS-TRAC...673?pt=LH_DefaultDomain_0&hash=item35b8bb4271

 

[TUDOR]

I used Do-Cap universals on my PTO shaft when I converted it to 1" solid shafting. I think they go a little smaller than that. Check at TSC, NAPA, or an industrial supply house.

 

[bulldogbones]

Thanks guys. I think what needs to happen is, I need to tear the center console apart and see how much more room I can get under the steering wheel. Then I can decide what coupler I will use.

Kbeitz - WOW those are some awesome couplers.... I just want a 5d to touch LOL

 

[gburnett]

For the Lovejoy couplings to work right both the pump and the engine need to be mounted solidly and exactly the same height and equal distance top to bottom.There are also Flex Couplers available that will work with a little diviation.

 

[Tractor-Holic]

Why not use the coupler that has 2 sprockets ,connected by a length of double roller chain??...

 

[bulldogbones]

When I did the engine transplant I had the engine on the work bench and had the love joy installed on the engine and pump then I lined everything up then welded the bracket to the backer plate. So I know nothing has moved. The only thing that it could be is the pump must be off just enough. When its spinning you cant see any osculation. So it must be a combination of ( not being perfectly centered, added hp/tq, Diesel engine rattle and shake )

 

[DonF]

They built drag cars with just one universal joint between the transmission and the rear end so I don't see why that would not work. I think a better ideal is the sprockets with the double row chain as Tractor-Holic suggested.

 

[bulldogbones]

Holic has a good idea. Never even thought about going that route. Not only is that an extremely strong route. But it also shortens up my gap between the engine and pump. Since im limited for space.

The only problem that might create is im not sure I have enough space to lower or raise the pump. But we shall see.

 

[TUDOR]

The chain and sprocket works best with perfect alignment. It is not a flexible coupling. If the engine moves and the pump doesn't, it will fail sooner rather than later.

 

[DonF]

The chain and sprocket works best with perfect alignment. It is not a flexible coupling. If the engine moves and the pump doesn't, it will fail sooner rather than later.

The best way is to attach the pump to the engine so they move together if there is any movement.

 

[Tractor-Holic]

They do sell different "spiders" for the Lovejoy's,made of Polyurethane or Delrin,that might last longer than the usual lighter duty material....I never really cared for Lovejoy couplings,I always had troubles with them failing easily....I suspect the harsh diesel power impulses & torque ,may have a lot to do with yours failing so quickly...
The chain/sprocket coupling can take up to .0100,.0125 or .0115 paralell misalignment on # 40,50,and 60 chain respectively,and up to 1/2" of angular misalignment,according to the specs in my Grainger catalog...(the #50 and 60 chain couplers require split taper bushings)..

W.W. Grainer sells a splined type of coupling that is failry forgiving of slight misalignment also..("S" flex shaft couplings)..but those also have rubber inserts that might prove unsatisfactory also...

I have a "rubber" U-joint coupling I got from an older BMW's driveshaft--it looks like a thick doughnut with 3 holes,which are steel sleeved,that simply bolts to a 3 bolt flange on the driveshaft!..beats me how they hold up for years,propelling a 3000 lb car around!.....

 

[bulldogbones]

WELLLLLLL. I think I figured out the problem. I tore the case down and upon further inspection I found one of the two bolts that hold the pump to the bracket was missing. SOOOOO im guessing that might have been the problem all along. Without that bolt the pump was able to rock in and out a 1/4" thus creating MISALIGNMENT.

Thankfully I bought a new lovejoy a while back, when I was toying with putting the Onan back in and selling it. So I am going to toss that in and see how it fare.



But on a side note I was going through my McMaster Carr book and found a coupler that will withstand the Tq. Which is 354 in lbs and the coupler takes 450 in lbs