Conversion to Manual PTO questions

[chiefsb30 59]

I've looked around and I know its been done. I have a 1973 no-name  Automatic 16 with an electric PTO that is failing. Seems that converting to manual is probably the cheaper and more reliable way to go. Does anyone have like a good parts list, and/or source for what I would need?

Thanks

Edited 16 hours ago by chiefsb30

[ebinmaine 75,121]

I'd have a fair amount of the hard parts you need. All used decent shape. 

I do NOT have a good clutch disc. @76c12091520h Brian Badman likely does.  

 

There will be engine brackets, PTO pulley, crankshaft spacer, handle through the steering tower, rod connecting the two. 

 

You'll want to procure new bushings.  

 

 

Others will be along to help.....

 

 

 

[8ntruck 8,265]

I'm thinking that this should be pretty much a bolt on conversion 'cause the electric PTO clutch was an option.

[chiefsb30 59]

2 minutes ago, 8ntruck said:

I'm thinking that this should be pretty much a bolt on conversion 'cause the electric PTO clutch was an option.

That is kind of what I was thinking. I'm just trying to sort out the details and give myself options.

[Ed Kennell 43,465]

Don't rule out the older Raider style PTO engagement design.    It is much simpler, fewer parts, and IMO the better design.

 

[ebinmaine 75,121]

26 minutes ago, Ed Kennell said:

Don't rule out the older Raider style PTO engagement design.    It is much simpler, fewer parts, and IMO the better design.

 

 

 

Definitely more simple 

[ri702bill 10,374]

10 minutes ago, ebinmaine said:

 

 

Definitely more simple 

But would lack the PTO Safety Switch. And may interfere with a plow angling lever - may require a "Z" bend to clear....

[Ed Kennell 43,465]

6 minutes ago, ri702bill said:

But would lack the PTO Safety Switch.

This brings up a question.    When  the electric PTO switch is on, does it prevent startup and does it kill the engine if the seat is vacated?

[ri702bill 10,374]

2 minutes ago, Ed Kennell said:

if the seat is vacated?

Ed... I believe the phrase is "if the seat is vacated unintentionally"! 

[ebinmaine 75,121]

38 minutes ago, ri702bill said:

But would lack the PTO Safety Switch. And may interfere with a plow angling lever - may require a "Z" bend to clear....

 

Not sure if a 1973 had a PTO safety or not. 

 

The angle lever would be an issue to be addressed for sure. 

I've had a plow from a 1974 on a 1967 so it can be done.  

[Ed Kennell 43,465]

Found the answer.   The electric PTO switch is part of the safety switch wiring circuit. Tractor

 1973 Auto 10hp 12hp 14hp 16hp Automatic OM Wiring Revised SN.pdf - 1973-1977 - RedSquare Wheel Horse Forum

 

 

 

[Handy Don 14,918]

1 hour ago, Ed Kennell said:

Found the answer.   The electric PTO switch is part of the safety switch wiring circuit. Tractor

 1973 Auto 10hp 12hp 14hp 16hp Automatic OM Wiring Revised SN.pdf - 1973-1977 - RedSquare Wheel Horse Forum

Ed beat me to it!

[lynnmor 8,159]

You need to be sure that the engine can stand the side pressure of the manual PTO.  An electric clutch doesn't put thrust on the crankshaft, a manual does which requires a thrust bearing in the engine.

[mrc 1,009]

i have a spare electric pto.    i was saving it for my bronco14 but, i recently sold the bronco and no longer need it.     plug and play.

 

if interested contact me via pm

 

regards

mike

 

 

[Racinbob 12,347]

A conversion I've been considering forever on my 05 because I don't like electric clutches. But you need to be sure your engine will be OK with it. Check out service bulletin #1961 addressing this. 

[ri702bill 10,374]

7 hours ago, lynnmor said:

An electric clutch doesn't put thrust on the crankshaft, a manual does

Please clarify. Both are inline radial devices. The side load, to me, comes from the device being driven at a right angle by the PTO via the tight belt, not the PTO itself.

[ebinmaine 75,121]

7 hours ago, lynnmor said:

You need to be sure that the engine can stand the side pressure of the manual PTO.  An electric clutch doesn't put thrust on the crankshaft, a manual does which requires a thrust bearing in the engine.

 

 

A '73 16 Auto should  have a Kohler. ... unless it's been swapped that'll hold the horizontal load ok. 

 

 

11 minutes ago, ri702bill said:

Please clarify. Both are inline radial devices. The side load, to me, comes from the device being driven at a right angle by the PTO via the tight belt, not the PTO itself.

 

He's referring to the horizontal load made when the PTO is engaged. Not the radial load from the belt(s).

The horizontal load is caused by the PTO putting pressure against the outside of the engine thereby attempting to pull the crankshaft in the outward direction.  

 

 

[Racinbob 12,347]

I've always figured that an electric clutch 'clamps' tight to the crankshaft. A manual push/pulls on the crankshaft as it engages. 

[Ed Kennell 43,465]

Radial (side) load from the belt tension is the same for manual and electric PTOs.

Axial (horizontal) load for electric PTO is zero.   The manual PTO pushes the crankshaft inward exerting an axial load on the thrust bearing.