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Old 04-09-2013   #11
davemskinner
1st Yr. Apprentice
 
Join Date: Mar 2011
Location: Pulaski, NY
Equipment: sold ZD28F Bought 04 Grnd L4330 /frnt mnt snwblwer L2185 & heated/AC cab.
Posts: 88
Default Re: zd28 trans problem

Quote:
Originally Posted by leibuys View Post
Hi Dave,
How did you know that both drive pumps were bad and not the charge pump. Also, i'm curious to know the cost of the parts and how you found the part numbers. What I am trying to find out is if Kubota is offering a repair kit or do you have to buy all the parts individually? I assume you also had to drop out th entire transaxle to do the job. Do you recall how long it took you? Thanks in advance? A local service department told me that the parts are $500 plus $1000 for installation but the parts pricing seems low to me.
THanks...
How did you know that both drive pumps were bad and not the charge pump. See my previous post (just made).


Also, i'm curious to know the cost of the parts and how you found the part numbers. Messick's (site sponsor) has all the parts manuals right on-line. You just provide an email address and they send you the section you request. It's awesome! They will provide quotes. As eserve said above, you can buy either side, both sides, or both sides and the charge pump. The cost of the kit for both sides together was $2000 + tax.


I assume you also had to drop out th entire transaxle to do the job. Do you recall how long it took you? Thanks in advance? A local service department told me that the parts are $500 plus $1000 for installation but the parts pricing seems low to me. I think I took a weekend to replace the two sides. However I am quite slow when doing mechanics, as I don't do it every day. I did not drop the entire transaxle. I did one side at a time and then opened up the charge pump to clean it out. I think it would be way easier to drop out the entire transaxle. Maybe eserv or Service Department Vic can weigh in here. You are correct about the pricing being low. I would get a detailed understanding before I went ahead with that.
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Old 10-06-2013   #12
ljd
New Member
 
Join Date: Oct 2013
Location: Somerset, Ohio USA
Equipment: ZD28, BX25, landpride rear tiller, brush hog, front snow blade, carry all
Posts: 2
Default Re: zd28 trans problem

I have a ZD28 Kubota I bought new in 2006, it has 366 hours on it now, I've only used it on my yard and it is mostly hills. The last few times I've mowed with it I noticed the right side drive getting weak. I came to the internet and found this post and freaked out.
I've done all the maintenance on this thing myself and wanted to make it last as long as possible. So, I just drained the Super UDT out and looked at the magnet on the drain plug and saw nothing (no metal) Then I removed the suction banjo and the screen had a bunch of like grey silicon chunks plastered around it. There looked to be about an inch of the grey silicone like stuff, on the screen, if the chunks were lined up about the diameter of spaghetti. The fluid level was about 1/4" above the full mark on the transmission pump. There has never been any leaks and the fluid has never been low on the transmission.
Do I really need to expect to pay out as much as $4500 to fix this thing or should I get a mower deck for my BX25 and spend more time mowing?

Any help on this issue will be appreciated. Is it possible there is something that clogged the passage ways to the right pump and making it not work properly or starved the pump to the point of having to replace it? The mower does still move but it was giving me problems when I took it to the barn. When I bought the ZD 28 I was told by the dealer that "If you want a Zero turn on hillsides it has to be a Kubota".
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Old 10-27-2013   #13
ljd
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Join Date: Oct 2013
Location: Somerset, Ohio USA
Equipment: ZD28, BX25, landpride rear tiller, brush hog, front snow blade, carry all
Posts: 2
Default Re: zd28 trans problem

Quote:
Originally Posted by ljd View Post
I have a ZD28 Kubota I bought new in 2006, it has 366 hours on it now, I've only used it on my yard and it is mostly hills. The last few times I've mowed with it I noticed the right side drive getting weak. I came to the internet and found this post and freaked out.
I've done all the maintenance on this thing myself and wanted to make it last as long as possible. So, I just drained the Super UDT out and looked at the magnet on the drain plug and saw nothing (no metal) Then I removed the suction banjo and the screen had a bunch of like grey silicon chunks plastered around it. There looked to be about an inch of the grey silicone like stuff, on the screen, if the chunks were lined up about the diameter of spaghetti. The fluid level was about 1/4" above the full mark on the transmission pump. There has never been any leaks and the fluid has never been low on the transmission.
Do I really need to expect to pay out as much as $4500 to fix this thing or should I get a mower deck for my BX25 and spend more time mowing?

Any help on this issue will be appreciated. Is it possible there is something that clogged the passage ways to the right pump and making it not work properly or starved the pump to the point of having to replace it? The mower does still move but it was giving me problems when I took it to the barn. When I bought the ZD 28 I was told by the dealer that "If you want a Zero turn on hillsides it has to be a Kubota".
UPDATE: I purchased the Kit # K3151-98060 ($1660) and am in the process of putting the transmission back together. The instructions call for a .020mm shim that goes between the bearing and the spiral gear on the input shaft mine is missing. I just wonder if this shim is something that is sometimes not needed unless parts are machined in a bit undersized to get the gears to mesh flush. My gears mesh flush without this shim. Someone who rebuilds Charge Pumps may have some insight. I'm putting it together using Ultra Grey permatex for the gaskets. Also the Rotor has punch marks on one side of each part, anyone know which directions the punch marks go into the charge pump case?

Of course I was curious as to why my problem of the right side pump motor was weak. The service rep I spoke with from Kubota told me these hst units could not be rebuilt. Remember This was a known problem with ZD28 transmissions and I'm out of warranty.
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Last edited by ljd; 10-27-2013 at 09:20 AM. Reason: add picture for the cause of this problem
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Old 06-15-2017   #14
zmega
 
Join Date: Jun 2017
Location: Leesburg, VA
Equipment: ZD-25 mower, L series tractor
Posts: 1
Default Re: zd28 trans problem

Apparently this is a common problem. My ZD25 began to fail a while ago (now has about 520 hours). Defective lubrication system design.
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Old 06-16-2017   #15
lugbolt
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Join Date: Oct 2015
Location: Mid, South, USA
Equipment: G1900-S with RC54-G20
Posts: 1,900
Default Re: zd28 trans problem

It's not a defective lubrication design. It's not a defect at all, really. What is is, is a maintenance problem and a service/owner's manual problem mostly.

The "book" says to change the fluid as x amount of hours. What the book doesn't say is that in hot climates, it needs to be changed more often. Also the cooler and radiator/screens need to be KEPT squeaky clean. So this means you get to change the fluid and filters more often if you live in a climate area that is over 90 degrees or thereabouts (pretty much the entire country). Most don't do it often enough; and it eventually leads to problems from heating the fluid, then the fluid can't remove heat from either HST effectively enough.

When experiencing an HST problem on any of the ZD mowers (21, 25, and 28 mostly-the 18 rarely had HST issues but it was lighter and less powerful), quiz the operator how it gets used, how often the fluid is changed, and what kind of fluid is used. Regular UDT won't cut it in a 21, 25, and 28 HST. Super UDT2 only and nothing else. there was also a hydraulic reservoir that could have been added to the system which increased the fluid capacity, but honestly it's not needed if the fluid is changed often. Also when doing a fluid and filter change, it's always adviseable to pull the screen while you're under it, clean it, and reinstall. Make sure the O-rings are in good condition and in their proper positions.

Another issue is the simple relplacement of a part, in this case an HST on one side only. Where did all the brass and metal shavings go? Through the ENTIRE transmission. Replacing one HST solves the immediate issue but there's still junk left inside the center case, brake cases, and the other HST...oh and the hydraulic system too. Need to get all that stuff out or it's very possible that the other HST may fail too. Need to check/verify charge pump pressure as well, per WSM. I like it on the higher side personally, so that as fluid gets hot, it doesn't drop the psi below spec.

The ZD300 series HST is totally different. Everything is bigger-a LOT bigger. Charge pump is twice the size, holds more fluid, different cooler, etc. But the mower itself got bigger as well and that's what I didn't care for on the ZD300's-it's size. It was like going from a Ranger to a F350 dually. You get used to it but it takes a while.
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