Trying Something ... With Your Help

[Mark Plukas]

I recently acquired a 680 Hydro with a bad engine. I also have a Kubota 3-cyl diesel. My intention is to put that diesel in the 680. Rumor has it that the frame rails will accept the Kubota. Fingers crossed!

 

[lpalma]

As long as you have the complete engine, motor mounts and and a radiator, but it will be a challenge if it did not come out of a cub cadet.

 

[Bret McFarland]

Sounds like a good project! The Kubota D600 should fit. The 680 has the same frame as the 882 or 782D which had the Kubota D600. Not sure if the spec number on the D600 would matter, but it might in order to have the correct PTO shaft length. If your motor came from a Kubota tractor, it may have differences. You may want to look up the model number/spec number to find out. Otherwise I think that there would be quite a few parts involved, including:
- the correct motor mounting plate
- correct PTO clutch for the D600 or WG600
- throttle cable
- the wiring harness would be different and I believe the ignition switch
- fuel tank, fuel lines, and pump (battery and fuel tank swap places)
- need the radiator from another Cub with the 3-cylinder Kubota (782D, 882,1512, 1572, 1772, 1782, 2182)
- you'll need a water temperature gauge

It would be nice to find a 882, 782D, etc. donor tractor for parts

 

[lpalma]

You will need a battery box, the list goes on....

 

[1811Cub]

The list of diesel specific parts is a long one. This swap would be far easier with a donor tractor, but they are few and far between.

 

[Cubbie]

Welcome to the forum, Mark!
Nice to have you here. Good luck with your project.
Got any pics handy?

 

[Mark Plukas]

As long as you have the complete engine, motor mounts and and a radiator, but it will be a challenge if it did not come out of a cub cadet.

Totally hear you Lewis and Bret!

This is definitely not a resto. job. This is a mod.

Engine is a 22HP Kubota D950. The engine was once an Onan marine genset. It has been torn down, inspected, built back up with new gaskets and seals. Insides were immaculate. Here it is primed and with first black coat going on.

From the measurements I have taken, if I remove the existing motor mounts, the engine fits between the rails on angle as mounts even though it is not a D600. The D600 is 176mm between the mounts and the D950 is 190mm but the oil pan still makes it cleanly. Dipstick will be a challenge.

I plan on fabri-cobbling most of the mounting parts, linkages, panels, battery box etc. and I have a nearby repository of old CC parts. I plan on using rubber pads for engine isolation. I should be able to machine shaft couplings and adapter plates for the drive train. Wiring is easy for me even from scratch and I plan on making a new dash for all the switches and gauges. (water temp, oil temp, oil pressure, glow plugs, battery and regulator, etc.) I am told by the previous (trusted) owner that all the hydro is solid.

Radiator will likely be a new one for a quad or some such...I do need to make sure it has the capacity to cool a diesel doing work. Will need to plumb for radiator and exhaust as it came with raw water heat exchangers.

SOOOO many decisions to make...but I am excited.

 

[-CӞ]

“fabri-cobbling”

 

[Bret McFarland]

Totally hear you Lewis and Bret!

This is definitely not a resto. job. This is a mod.

Engine is a 22HP Kubota D950. The engine was once an Onan marine genset. It has been torn down, inspected, built back up with new gaskets and seals. Insides were immaculate. Here it is primed and with first black coat going on.


From the measurements I have taken, if I remove the existing motor mounts, the engine fits between the rails on angle as mounts even though it is not a D600. The D600 is 176mm between the mounts and the D950 is 190mm but the oil pan still makes it cleanly. Dipstick will be a challenge.

I plan on fabri-cobbling most of the mounting parts, linkages, panels, battery box etc. and I have a nearby repository of old CC parts. I plan on using rubber pads for engine isolation. I should be able to machine shaft couplings and adapter plates for the drive train. Wiring is easy for me even from scratch and I plan on making a new dash for all the switches and gauges. (water temp, oil temp, oil pressure, glow plugs, battery and regulator, etc.) I am told by the previous (trusted) owner that all the hydro is solid.

Radiator will likely be a new one for a quad or some such...I do need to make sure it has the capacity to cool a diesel doing work. Will need to plumb for radiator and exhaust as it came with raw water heat exchangers.

SOOOO many decisions to make...but I am excited.

Swweeeeet! Nice motor. I would go full-frankentractor on this one!

 

[PACub100]

Interesting, it seems like you have a good head on your shoulders and are going to go for it wisely, not just slapping things together. Will be cool to see how you progress

 

[Bret McFarland]

I recently acquired a 680 Hydro with a bad engine. I also have a Kubota 3-cyl diesel. My intention is to put that diesel in the 680. Rumor has it that the frame rails will accept the Kubota. Fingers crossed!

This might help ... here is a rare find (if you have not seen it) -- an 882 parts tractor nearly complete:
https://cleveland.craigslist.org/grd/d/sandusky-cub-cadet-882d-parts/7571945870.html

 

[tkhoffman]

Marine.... Yup, water heat exchanger manifolds.