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Kubota F2400 Hydro Drive not driving

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bertsmobile

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Discussion starter · #1 · (Edited)
As the title says , we are still batteling with this mower .
We got it off a farmer who got it from a farmer who got it from a contractor who bought it from a golf club so it ain't no spring chicken .
I seriously doubt the final 2 owners did any maintenance on it whatsoever .
So we have rebuilt the bevel box and all spindle housings then put 10lbs of welding rods on the deck so now it cuts nice
Trouble is is don't go.
When we got it the tranny oil was low so it got new oil & filters.

The hydro drive is quiet and the lift ram responds quickly so we have assumed the hydro pump is working well enough.
Got he factory manual, not much information there so we are wondering if any one out there has any experience with this drive.
W can get a replacement hydro but at $ 9,000 it is a touch on the two dear side .
I was thinking that the Forward &/or Reverse bypass valves may be sticking or perhaps the pump over pressure valve might be diverting most of the oil back into the return reseviour but we are at a loss as to how to test this .
Further more Kubota Aust have never sold either of the valves which suggests that they do not usually give grief .
Any help / insight would be gratefully appreciated.
From cold it will go forward at about 1/2 speed and just crawl in reverse but after soon start to get progressively slower till it just stops

FWIW the old oil , although being quite low was also crispy clean
 
#2 ·
maybe research the original manufacturer of the hydro drive and see if they have a service manual for it with a diagnosis chart, or perhaps just rebuild it if parts are available?
 
Discussion starter · #3 ·
No name or tag on it so AFAIK it is Kubotas own,
A much better set up than most I have seen
The kidney valve has a replacable plate so when it wears as they all do you just swap the plate over
Mind you to do that you have to split the tractor then unbolt it as it is sandwiched between the clutch housing & diff
It isn't a belt driven bolt on like on a lot of mowers & SCUTs
In fact the rear PTO shaft runs from the diff right through the pump housing
 
Discussion starter · #5 ·
Thanks for that
Put the Kubota on the back burner for a while
The HST looks almost the same except for the position of the oil filter
Now for a silly question, which end of the PTO shaft comes off first
The one fitted to ours looks fully telescoped and neither end wanted to shift ( another reason it is on the back burner right now )
 
#6 ·
You are a welcome.
I understand but the mowing season is approaching fast, actually I had to do our first mowing of the season three days ago! Yes it's early but that is how it is in our climate.

In my photo yesterday you are not looking at a PTO shaft, what you see are "Pump Shaft" item 21 on top, and "Rear Wheel Drive Shaft" item 20 on the bottom.
PTO shaft would be forward of the front axle, item 9 in the drawing below. (Mower front axle is where item 10 is shown)


Pump Shaft (the one with the plastic fan) is the one with "telescope" or axial adjustment, and I had to unbolt the engine end first, in order to compress the "telescope" more & remove it.
On mine, the pump end yoke has two bolts which have to be unscrewed all the way, in order for the yoke to slide off the pump shaft.
 
#7 ·
I was just on the Messick's website and was able to look up detail parts diagrams on F2400 HST, but did not spend lot of time on it.

Like I said above, mine is a 4x4 with HST and there are two shafts pointing towards rear (pump shaft & RWD shaft), and PTO shaft is forward on the front axle.
 
Discussion starter · #8 ·
Thanks for that Art.
Yes I used the wrong terms, sorry for that.
It is the HST pump shaft that needs to be removed & you have told me exactly what we needed to know
It came without the rear wheel drive shaft .
Another job to look at after we get the HST to drive properly on the flat, we will try to get it to drive up the big hills.
As in the first post, it was very much used when we picked it up so it is a learning experience and the service history ( or total lack of it ) is a mystery also.
Done a full deck rebuild and put about 20 lbs of weld into the deck new bearings , shims & seals plus new universals on the deck shaft which looked like neither end had ever been greased
Next step for that was to make some plates to straddle the welds as it looks like the PO has done more that a bit of welding there before us.
No surprise as all 3 blades were very much out of balance .
We are in OZ so our mowing season is frantic right now as each one of the pasture grasses starts to seed.
Stock levels are at about 20% due to previous drought so the cows can not keep up with the grass .
We actually mow just about all year round if the rain is reasonable , the owners are very adverse to over stocking as cattle prices won't cover winter feed costs
 
#9 ·
No worries, glad if I could help!

I bet you have different conditions down there.
Here on the west coast of US we usually get two little breaks in the mowing season; one mid winter December/January with grass still green, and another one in August/September with grass all brown!

If the F2400 HST is weak & the hydro oil is OK, I would suggest checking the oil strainer in the pump suction for blockage (assuming it has one like mine does?).

Mine had been serviced at regular intervals by a "pro shop" for the previous owner, but it sure looked like the oil strainer had been ignored for some time.
It's a bit of a messy job and somewhat time consuming to remove & clean it so it's easy to understand how shop may just ignore it.

Cheers!


HST oil strainer in F3060:
 
#11 · (Edited)
So Kubota F3060 all HST oil flow has to pass through oil strainer first, going to low pressure oil pump which feeds everything in the system, including power steering & deck lif and HST high pressure pump/motor.

IE.
If the strainer is partially blocked it will affect HST drive and should eventually affect PS & deck lift also.

Here is the F3060 hydraulic circuit:

 
#13 ·
bertsmobile said:
Thanks for that Art.
Yes I used the wrong terms, sorry for that.
It is the HST pump shaft that needs to be removed & you have told me exactly what we needed to know
It came without the rear wheel drive shaft .
Another job to look at after we get the HST to drive properly on the flat, we will try to get it to drive up the big hills.
As in the first post, it was very much used when we picked it up so it is a learning experience and the service history ( or total lack of it ) is a mystery also.
Done a full deck rebuild and put about 20 lbs of weld into the deck new bearings , shims & seals plus new universals on the deck shaft which looked like neither end had ever been greased
Next step for that was to make some plates to straddle the welds as it looks like the PO has done more that a bit of welding there before us.
No surprise as all 3 blades were very much out of balance .
We are in OZ so our mowing season is frantic right now as each one of the pasture grasses starts to seed.
Stock levels are at about 20% due to previous drought so the cows can not keep up with the grass .
We actually mow just about all year round if the rain is reasonable , the owners are very adverse to over stocking as cattle prices won't cover winter feed costs
Click to expand...
Hey did you get any resolution to this issue ??
Thanks
 
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mwarren1941
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