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Kubota D722 Slow/Hard Cranking

bgaidan said:
Update:

Ebay starter showed up. Slapped it in along with a new battery and she cranked right over at mach fuck. Fired right up. :smokin:

Hooked the prop shaft back up and seems like the pumps are working. Drive tires are bald and one is off the bead haven't been able to take it for a spin.


Got two other starters on the way. If the others are the same fix, I got a :smokin: deal.
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:beer:
 
Good deal just don’t go and try and start it on a run down battery:lmao:. Protect those contacts :flipoff2:
 
on a diesel? no plugs!
those starters are shitty.. you need to upgrade it to the reduction starter the later ones use.
 
i've had a few gear reduction starters get weak on jeeps. what i would find, is that out of the 4 brushes in the motor, 2 or 3 of them would be stuck in their slides. after they were freed, i'd apply a very light coating of antisieze to the outside of the brushes and put them back together. They would work fine after that.

remove the hex bolts from the endcap of the starter and it will come off. they go all the way thru the motor and into the back of the gear housing. Check the commutator to see if it is good or destroyed. a little scotch-brite will help clean it up. When you pull the endcap, the brushes are spring loaded and will go to the center of the cap if they aren't stuck, and the stuck ones will stay put. it doesn't take much to free them, and a little lube-job gets it back to working. on your starter, it looks like the brush carriers assembly is held to the end-cap by the phillips screws. you should be able to get the brushes on, align the holes for the long bolts, then slide the metal endcap on.
 
V30crewcab said:
I know, I have a couple of cub cadet diesels that have a kubota in them. they suck to start!
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I've never experienced this, these little tiny diesels are really easy to get going even with the terrible fuel I run

ETA: are you spinning them fast enough?
 
[486] said:
I've never experienced this, these little tiny diesels are really easy to get going even with the terrible fuel I run

ETA: are you spinning them fast enough?
Click to expand...
mine needs a new starter, and you have to pull the motor out to change it. got the new reduction starter, just haven't had time to deal with it.
 
V30crewcab said:
mine needs a new starter, and you have to pull the motor out to change it. got the new reduction starter, just haven't had time to deal with it.
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any room onboard for a second battery?
pretty easy to wire 24v to the starter and 12v to everything else, you just aren't going to be charging both batteries so it does need a little maintenance charger action
 
no room, and I'm not gonna rig it when I can fix it right. its basically a toy, that I mow with now and then. I have another cub I usually mow with since I need the smaller deck to get between the trees.
 
jeepnmatt said:
i've had a few gear reduction starters get weak on jeeps. what i would find, is that out of the 4 brushes in the motor, 2 or 3 of them would be stuck in their slides. after they were freed, i'd apply a very light coating of antisieze to the outside of the brushes and put them back together. They would work fine after that.

remove the hex bolts from the endcap of the starter and it will come off. they go all the way thru the motor and into the back of the gear housing. Check the commutator to see if it is good or destroyed. a little scotch-brite will help clean it up. When you pull the endcap, the brushes are spring loaded and will go to the center of the cap if they aren't stuck, and the stuck ones will stay put. it doesn't take much to free them, and a little lube-job gets it back to working. on your starter, it looks like the brush carriers assembly is held to the end-cap by the phillips screws. you should be able to get the brushes on, align the holes for the long bolts, then slide the metal endcap on.
Click to expand...
Now that I've found them for $35 on Amazon, it's hard to justify spending much money trying to rehab the old ones. Now that I'll have 3 or 4 spares, I may tear in to one or two to see if it's anything obvious, but it's definitely not priority at this point.

V30crewcab said:
I know, I have a couple of cub cadet diesels that have a kubota in them. they suck to start!
Click to expand...
[486] said:
I've never experienced this, these little tiny diesels are really easy to get going even with the terrible fuel I run

ETA: are you spinning them fast enough?
Click to expand...

For the most part, mine start very easily. They seem to need about 3-5 seconds of glow plug, even the brand news ones. I do notice that the tired one in my old Grasshopper tends to start easier when the oil is a little low vs. when I have just topped it off. She also blows a smoke cloud for the first ~30 seconds after a cold start, but clears right up. It'll also puff a little coal when I'm going up hill and high a patch of thick or high grass and bogs down a bit. I'm pretty sure that engine has over 4k hours on it so I'm not at all disappointed.


crispins said:
Sell me one, I need one for my off road park.

Hook a Caucasian brother up!
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What? A mower? Assuming all of these end up being serviceable, I plan to sell off 2 of them (or 1 and my old grasshopper). Not sure where I'll end up price wise. They all need tires and a bunch of little random wear parts that I'm planning on ordering in bulk once I get a list together.


I really don't have many complaints over these little kubotas. My last batch of minis had the same 722s in them. Hit them with a little glow plug and they crank right up on the first turn. So much quieter and less rattley than the gas versions.
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2nd starter showed up today and machine #2 came purring to life.

These low hour engines start way better than my old tired one :smokin:



The rattling was a little unnerving at first, but turns out there are a couple bolts missing from the engine cover and it's bouncing around. :shaking:
 
The $35 starter from Amazon showed up today. Interesting the the body is a bit smaller diameter, but otherwise looks like it'll bolt up. New on on the right, OEM in the middle and the generator one on the left. It doesn't compute with me that this thing crosses over to a 7.3 Ford and bunch of other much larger engines. :confused:

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I ended up with one similar to the generator one (but clocked correctly), one OEM and now the Amazon special. We'll see which one fucks off first. :laughing:
 
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