Hydro 70 tranny advice

Rascal 7256

New User
We just bought a Hydro 70 a couple weeks age with 3600 hours on the meter.

I have been using it to pull a John Deere roll over 2 bottom 18 inch plow which works the snot out of the tractor.

Yesterday, as I turned around at the end of a row, the old tractor started spraying Hi-Tran out of the top of the tranny somewhere. The oil was squirting out to the left of the tractor and coming out from under the starter.

She puked out about $200 worth of Hy-tran in a minute or so while I was trying to see the source of the spray.

Can anyone tell me what happened? Or what we need to do to fix it?

Also, how does one access the internal transmission filter to change it?

Since the tranny is already nearly empty, this seems like a good time to do so. And I have been carrying the filter around in the pick-up for nearly two weeks.
 
The transmission filter lies horizontal on the left outside of the tractor and is a spin on. The hydraulic filter is on the right side belly under a round cover.

Be sure to check the oil level with the tractor running.

There is no "inside" transmission filter.

Allan
 
Sounds like you have a leak in recirculating filter line next to starter. Also, remember, you check the oil level with engine running on a hydrostatic tractor.
 
If the spin on filter and sealing ring are OK I would look for a cracked flare on one of the tubes connecting the filter base.

The main hydraulic filter is on the lower rear right side of the center section. The are a couple of bolts that hold a cast dome to the housing. The filter is inside that dome.
 

Oh, that domed cover. On the right bottom of the housing.

All I need to do is remove the right side step to get to it on this tractor. That is plenty easy enough.

I am pretty sure the Hy-Tran all came blowing out of this brass port on top of the tranny.

DSCF2308_zpsgm0e1qdm.jpg


I assume it is a vent line for the transmission???

What could cause the tractor to blow the contents of the hydrostat out this tube??

Air in the oil has been suggested. We did hook up an old plow on which the roll over device had not been used in at least fifteen years.
 
I have had quite a few of those hydrostatic drives apart but I cannot put my finger on what that fitting is for. It is on the wrong side to be the test port for charge pressure. It is not a breather though I can assure you of that as that valve body is charge pressure regulator assembly and that whole front section is totally filled with oil when hydrostatic drive tractor is running. That is why you have to check the fluid level with engine running as that center housing drains back when engine is shut off.
 
I'll get you a picture of mine this morning and post it back at noon. Or, if you like, give me your cell number and I'll shoot you the picture of that connection.

The plow had nothing to do with your issue. It's just a hydraulic cylinder and uses another pump to operate (same oil though).

Allan
 
As close as I can tell from the online parts book, that fitting should have a temperature warning sender screwed on it. It kinda looks like it had some tread sealing compound on it. CaseIH still has the part 84160157 but better wait for Allans picture to be sure before you buy one. You should be able to screw a pipe thread cap over the fitting and run it with no problem.
 
Looked online at pictures of the sensors and thinking it must be pressure as the temp sensor screws into the valve block and the pressure sensor screws onto a fitting.
 
Hmmmmmm, Okay, I did find a wire unplugged and hanging in about the same area. And the brass fitting is definitely threaded.

Perhaps the pressure sensor came unscrewed or blew off or ???????

That would leave an open pressurized port for oil to blow out of I suppose.

Thanks for the suggestions. A pic of the part on an operating tractor would be really appreciated, if possible.

I have ordered the owner's manual and the I&T shop manual from this site. They should help me get this thing figured out.

As to why the plow is working the tractor so hard. A little explanation:

I am working up 6 acre field which has not been turned in over fifty years. It has been used as dryland pasture, though I did occasionally run a bit of irrigation water over it to increase the cheat grass and annual blue grass production for the cows and horses.

The ground is heavy adobe in many places, and has pocket gopher runs through out, so I am plowing as deep as I can get the implement to run in order to cut out the gopher runs. Sometimes as deep as sixteen inches, even if it means I have to slide over and only plow with the back mold board in many places.

In this heavy soil, with both plows cutting, the draft control will pull the plow up to about three inches of depth, and lug the tractor at 2 to 2.5 mph.

Fifty some years ago, Dad used to grow a pretty decent alfalfa hay crop on this ground. He did all his work with a Ford 8N and a two way grasshopper plow.

We are now trying to resurrect the field.

The Son in Law announced yesterday that he was bringing in a 4020 to finish the plowing and discing chores. That old girl should pull the two bottom with no complaints.
 

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