B7200 servicing transmission: Kubota Review  -- Kubota Tractors Discussion Forum and Review B7200 servicing transmission: Kubota Review -- Kubota Tractors Discussion Forum

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 05-20-2006, 16:24 Post: 129625
Madcat



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 B7200 servicing transmission

I know this is a easy question,but this is my first tractor and i dont have a manual yet. I need to check and fill the trans fluid. I found the dip stick for it under the seat. Im not sure if i have to check it with the engine running or not. Also were do i fill it up if low? There is a small capped cylinder with a line comeing out of it beside the dip stick. Is that the fill point? I just need to be sure.






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 05-28-2006, 00:00 Post: 129954
WillieH



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 B7200 servicing transmission

Madcat -
Better safe than sorry - Good Question.

The "read" should be taken when the tractor is hot, that is after it has had a chance to run for abit and circulate the hydraulic oil thru-out the system. This is done, so that any and all air will be bled out and emptied into the tranny housing.

Make sure that the engine has been shut off and oil allowed to settle for a few minutes. Then pull the dipstick, and identify the hash marks and level.

As far as filling location is concerned, there should be a hose coming into a samll aluminum cylinder (it looks like a small aluminum medicine bottle) approximately three inches away from the dipstick location, on the opposite side of the tranny housing top. On top of this assembly, is a small black screw in cap with an o-ring seal. It is usually rather cumbersome to fill as it is just far enough under the seat edge to NOT be handy. Get a long necked funnel, and you should be all set - just do not over fill, as hydraulic oil needs room to expand when it gets hot. If you over fill the reservoir / tranny, there will be no place for the expansion to go, other than to start blowing seals out. Just use the dipstick marks and you'll be fine.
Hope this helps -

- Willie H






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 05-28-2006, 08:24 Post: 129958
Madcat



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 B7200 servicing transmission

Thanks for reply
I filled the transmission to proper level but i still have a strange sound comeing from under the tractor. It sounds like a faint fluttery whistle while moveing fwd or backwards only. Almost like air blowing through a vent or breather under the tractor. Everything works great except for the odd sound. Have you heard of this sound before or know what it might be. It's not the normal HST whine,i know that whine is normal.
Serviceing fluid didnt make any difference (thought it might be low ,causeing the sound).






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 05-28-2006, 15:28 Post: 129961
WillieH



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 B7200 servicing transmission

Madcat -
What you have described, sounds like a breather that is partially blocked - possibly from grease/oil gunked over it. However, it also may be coming from the pcv tube, if that is blocked in some capacity. It would be located on the left side of the engine compartment, outboard of the tractor's frame, aiming downward. Check to see if there is any noticeable smoke coming from the tube.

Many times, it is mistaken that the tranny needs servicng due to lack of oil, only to realize that the pump seal has been leaking allowing hydraulic fluid to enter the crankcase causing 'over filling', and ultimately blowby out the pcv tube.
On the same thought, I would suggest that either a pump plate or bearing was heading south, however, the pump SHOULD be running at all times, and you would be getting the noise regardless of movement.

Another possibility, is that you say it only happens when moving forward or backwards. There is a drive shaft connecting the front axle to the tranny. It is typically about 1 - 1.5 feet in length, with a secured boot at each end. The bearing set in the lower side does wear, and usually will only create noise in one direction, however, if bad enough it will in either direction. This is not a hard undertaking, just the fact that you have to crawl under and disconnect the shafts and get it off to rebuild.

If you find this to be potentially the culprit, disconnect the drive shaft, and take it off (about 1/2 hour job) and try without shaft. If the noise is gone, you definitely know what to do. If you find that it is still apparent, reinstall, and move onto the next point on the hit list that is more invasive.

It is not uncommon for these assemblies to create noise when the bearing(s) wear out. I have had three units (B5200's and one B1550) of five that have had this shaft pulled and rebuilt.

Hope this helps -
- Willie H






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 05-28-2006, 15:52 Post: 129963
Madcat



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 B7200 servicing transmission

Ok,I'll check that pcv valve out when i get off work. Good idea.. Were might the breather you were refering to be located at?I can check that too. There is some kind of device on the bottom of the HST,(dead center). Would that be it?
I'll also check the front drive shaft. I have however tried it in 2 wheel drive which makes the noise much much loader. The noise seems to calm down some after a bit of use. It also only makes this noise when at a higher speed than a crawl. As long as i go slow it is quiet. It really doesnt sound like metal to metal its more like a medium pitch whistle that flutters. Is the seal hard to change that causes the internal leak to the engine crank case?






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 05-28-2006, 22:11 Post: 129975
WillieH



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 B7200 servicing transmission

Madcat -
You would be surprised how different noises are relayed thru the unit, to sound TOTALLY different than its origination. Case in point, take a look at the rear wheel hubs. They will have a thru pin approx. 3/8" dia. that positions the hub on the hex axle. Then there will be a hex headed bolt and nut assembly that clamps down thru the hub onto the axle, to solidify the hub to the axle. Over time this bolt and nut jamm assembly will loosen slightly. When it does and you drive in either direction, one could swear that your driving over a glass bottle and it is shattering.
(Metal on metal, but under load at low speed.)

The tube should be able to be seen originating from the top of the engine. It will be connected to what appears to be a small square block (about 1.5" sq. +/-), and then the tube travels reasonably straight downwards as a breather mechanism. The tube itself originally was a rubber tube/hose, about .5" O.D.. Keep in mind, this unit is several years old now - it may have been changed along the way.

The assembly on the forward side of the HST, is what is known as a "drop box". This is a gear box that allows a belly mower to be driven off the tranny, at a higher speed than the output gear set of the tranny. The mower driveshaft would quick couple to it. Unless the PTO was engaged, I believe this would be inactive, thereby NOT causing any noise, as it would not be turning.

Check the fill cap for a center breathing hole. This hole may be somewhat plugged causing your whistle. As you speed up, the flow of fluid increases thru the tranny, and consequently, the whistle will pick up in intensity the faster you go.
You could also check the cap underside. It should have an o-ring for a seal. If this is broken or missing, the pressure built up in the tranny housing could be releasing thru this void, and because it is below the seat line, could be making it appear that it is under the tractor.
However, I am not sure why it would intensify under two wheel drive conditions vs. four wheel. Typically, the more load or strain on a system, such as engaging the 4wd in this case, would have a more negative effect. (HMMMM, gotta think on that one)

The seal is located on the backside of the pump. It is really not a big job, merely a messy one that invovles a certain amount of finesse, as one needs to pull the pump and change the seals without damaging the new ones upon installation.

Question - Does this unit have a loader on it?

- Willie H






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 06-09-2006, 18:36 Post: 130707
Madcat



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 B7200 servicing transmission

Ok i seemed to have stopped the fluttery whistle noise. I sprayed some wd40 down on some linkage ,just under the center cover for the HST. The linkage for the foot pedal and speed lever. While it got rid of the squeeky linkage noise it also resolved my whistle noise. Im think there is a plunger to operate the HST fwd and backwards and it might have been bypassing or had some trash in it. Who knows but atleast its fixed.






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 06-09-2006, 18:51 Post: 130708
WillieH



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 B7200 servicing transmission

Madcat -
Glad to hear you "found" something that created the noise. I know, one time, I thought that the entire tractor was going to fall apart under me, as I heard a horrible metallic clattery noise that I had not heard before.

Turned out that the lock bar for the split breaks had loosened up in the catch clip. Man did that scare me!

Weird noises do happen, but 90% of the time, it is something simple.

Thanks for the update. Have a noise free weekend !

~ Willie H






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