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720 Diesel
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den/southern illinoi View Drop Down
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Joined: 11 Sep 2009
Location: Sparta, Illinoi
Points: 1984 		Post Options Post Options   Thanks (0) Thanks(0)   Quote den/southern illinoi Quote  Post ReplyReply Direct Link To This Post Topic: 720 Diesel
    Posted: 02 Feb 2019 at 7:53pm
Happened upon a Kubota T 1600 garden tractor that ran good for a reasonable price. Bought it to install the engine in one of my 720's. We've been working on it for about a month a day or maybe 2 each week. Got to run it yesterday and got to drive it today. Engine is a 14 1/2 hp engine. A few little tweaks and some work on the paint and it will be ready for show season. Den

Here's some pictures






The dash remade









Own 4 wheel 20, 2-5015, 5020 and associated equipment and 2 electric forklifts.
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mnoonan-NEWI View Drop Down
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Joined: 11 Sep 2009
Location: Marinette, WI
Points: 738 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mnoonan-NEWI Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2019 at 9:27pm
Awesome Dennis! A lot of guys are interested in putting a diesel engine in their 720's. Thanks for the pictures. Mike
AC CA, Ferguson TO-20, Ford NAA, M-M BG, AC #3 Mower, SC Plow, PH Digger, AC 720's with Ark 700 loader & Brantly Backhoe, "Mini B" w/flathead Ford V8
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Nate (OH) View Drop Down
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Joined: 12 Sep 2009
Location: Bellevue, Ohio
Points: 216 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Nate (OH) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2019 at 1:13am
Very well done! How bad was the process? Other than notching the frame by the battery was there a lot of modifications needed to get it to fit?   
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den/southern illinoi View Drop Down
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Joined: 11 Sep 2009
Location: Sparta, Illinoi
Points: 1984 		Post Options Post Options   Thanks (0) Thanks(0)   Quote den/southern illinoi Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2019 at 5:43am
Process not too bad. Yes, notched the frame for the radiator. Also cut
out the floor under the motor for the diesel oil pan. Did not have to cut
out the mounting bolt holes for the Onan. Other than the dash, the whole process can be reversed and it can be an Onan 720 again. I actually bought a different dash just so I could have everything to put it back if necessary.
Den

Own 4 wheel 20, 2-5015, 5020 and associated equipment and 2 electric forklifts.
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Joined: 09 Feb 2016
Location: Dexter Mi
Points: 1217 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ac720nut Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2019 at 7:38am
Looking nice, always wanted one of those
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DSeries4 View Drop Down
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Joined: 12 Sep 2009
Location: Ontario, Canada
Points: 7332 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DSeries4 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2019 at 8:55am
Boy that thing is shoe horned in there!  A shame that it has less power than the original.  Can you fit a turbo on it anywhere?
'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '61 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Steve in NJ View Drop Down
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 11791 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2019 at 9:54am
Like Prego! Its in there!   Looks great Den!
Steve@B&B
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Dave (NE) View Drop Down
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Joined: 12 Sep 2009
Location: Eagle Nebraska
Points: 2147 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2019 at 10:51am
Do you still have access to all the same hydraulics like the front couplers for the front blade?  Dave
Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.
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HudCo View Drop Down
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3536 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2019 at 11:25am
nice  set up i have been looking for a kubota b7100 4wd to or yanmar 4wd to put the all the 720 sheet metal on the whole tractor
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HudCo View Drop Down
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3536 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2019 at 11:27am
you will never go back to to that onan but i allways try to make sure my mods are reverable again ( back to oem)
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den/southern illinoi View Drop Down
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Joined: 11 Sep 2009
Location: Sparta, Illinoi
Points: 1984 		Post Options Post Options   Thanks (0) Thanks(0)   Quote den/southern illinoi Quote  Post ReplyReply Direct Link To This Post Posted: 04 Feb 2019 at 6:37pm
No Dave (NE) we did not keep the front hydraulics. For this project (show
tractor) we did not want to fight getting new piping to the front past the engine and we thought that hoses would be ugly. Total sacrifices on this conversion include the front hydraulics, foot clutch, both PTOs. Without major alterations to the frame and hood, the PTOs and clutch are out. When we did the narrow front on the 720, we lost nothing. The one item the narrow front end eliminated was the snow blower both for the weight of the thing and the drive shaft set up.   Den   

Own 4 wheel 20, 2-5015, 5020 and associated equipment and 2 electric forklifts.
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tadams(OH) View Drop Down
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Joined: 17 Sep 2009
Location: Jeromesville, O
Points: 10119 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tadams(OH) Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2019 at 2:50pm
Really looks like a nice job.
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Dave (NE) View Drop Down
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Joined: 12 Sep 2009
Location: Eagle Nebraska
Points: 2147 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2019 at 3:51pm
Say, Den, do you bring your 720's to Hutch?  Be neat to see them there.  Dave
Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.
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JoeO(C-MO) View Drop Down
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Joined: 12 Oct 2009
Location: 3rd Rock > Su
Points: 132 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JoeO(C-MO) Quote  Post ReplyReply Direct Link To This Post Posted: 16 Feb 2019 at 12:20pm
Originally posted by den/southern illinoi den/southern illinoi wrote:

Process not too bad. Yes, notched the frame for the radiator. Also cut
out the floor under the motor for the diesel oil pan. Did not have to cut
out the mounting bolt holes for the Onan. Other than the dash, the whole process can be reversed and it can be an Onan 720 again. I actually bought a different dash just so I could have everything to put it back if necessary.
Den
 
AHH!!  Mystery Solved!!!
D10 III, D15 II 3 pt, D15 II SC, 170 Gas w/shuttle, 175 Diesel UI ROPS, 185 w ROPS. AC 653 w/6 way blade, ROPS
AC 615 Ind. WD45 running/Parts.
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Joined: 13 Jun 2011
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Points: 1656 		Post Options Post Options   Thanks (0) Thanks(0)   Quote macvette Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 2019 at 6:13pm
Sure looks nice, Den!  Good job.
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DaveKamp View Drop Down
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Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 5754 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2019 at 4:32pm
Originally posted by DSeries4 DSeries4 wrote:

Boy that thing is shoe horned in there!  A shame that it has less power than the original.  Can you fit a turbo on it anywhere?


Probably less HP by virtue only of the shaft RPM.  It would be more sprightly with the 3-cyl 25hp underhood, but it'd be a little more work to make it fit.

FWIW... I pulled a flat-twin onan 19 out of my skid-steer, and am putting in a 3-cyl Kubota in it's place...  Big smile

Not a good idea to put boost on the littleBotas.  If the diesel doesn't have enough power, put the gas/spark head and a carb on it, and spin it faster.
Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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Joined: 29 Jan 2013
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Points: 3536 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2019 at 10:37am
what about the  trans oil cooler ? i did not see one 
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den/southern illinoi View Drop Down
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Joined: 11 Sep 2009
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Points: 1984 		Post Options Post Options   Thanks (0) Thanks(0)   Quote den/southern illinoi Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2019 at 3:20pm
Oil cooler in is now a flat oil cooler that is mounted below the hydro on the
bottom of the tractor. Tried to keep it in the same spot for looks if nothing else but could not clear everything. Den

Own 4 wheel 20, 2-5015, 5020 and associated equipment and 2 electric forklifts.
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