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post #1 of 10 Old 03-30-2009, 12:20 PM Thread Starter
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hydro 175

can someone tell me how to change the fluid in the hydrostat?

Is the transmission and the differental one unit or are they seperate?

thanks in advance!
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post #2 of 10 Old 03-30-2009, 01:14 PM Thread Starter
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Re: hydro 175

Went out and dropped the plug on the differential. some came out BUT the level dd not change in the res.

John deere said to drain it out there...

Could someone plese enlighten me?

Greg
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post #3 of 10 Old 03-30-2009, 04:01 PM
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Re: hydro 175

The hydrostatic transmission is separate from the differential. Each is sealed and has separate fluids (heavier weight for the diff... the hydro uses motor oil).

Luckily, I have tech manual on my jump-drive.

Here's the short version...

Remove the mowing deck.

Differential
- drain
- replace drain plug
- fill with 0.7L (1.5 pt) of SAE 90 into upper fill plug (front of diff)
- oil should be a short distance below the fill hole
- replace fill plug

Hydro
- clean off transmission to prevent contamination (requires removal of fender deck and fuel tank, etc.)
- drain (I assume there's a drain plug on the bottom)
- remove vent plug beside reservoir
- add new oil (SAE 30) until oil appears at vent
- rotate input & output shafts to release trapped air
- add more oil until oil reappears at vent
- reinstall vent plug
- fill to 140mm below reservoir top (full mark).

Good luck - JMJ

Last edited by johnjans; 03-30-2009 at 04:08 PM. Reason: correction
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post #4 of 10 Old 03-30-2009, 07:38 PM Thread Starter
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Re: hydro 175

Fist of all I would like to thank you for your help.

I talked to our local dealrship and they told me the plug on the diff. was where the hydro drained. I pulled it and saw right off it was a heavy weight oil. So I called them back. They assured me that I was on the right track......

Took it to a buddy's house who has a concrete floored shop and a way to lift the mower where I can get under it. I saw where the hydro had another drain plug......

I put almost a qt of 80-90 in the diff and drained the hydro. I put back in some of the hydro fluid they {John Deere} sold me. Looks like 30 wt. I topped it off and nothing...in and out of "gear" and finally got it to go.

Ddn't know about the vent. I hope I haven't hurt it. I will do the vent thing tomorrow. How do I "remove" the vent plug? Where exactly is it?

I tried to find a downloadable Service Manual..Do you know where I can get it ? Tried to buy something from JD. I couldn't find anything so I winged it.I have trouble with them every tme I go there. Like for instance thy sold me 5 qts of the hydro transmission oil and acted like I needed it. Said they looked it up and that was how much I needed as far as they could find.

Thanks for the info. I really appreciate it.

Last edited by glshubert; 03-30-2009 at 07:55 PM.
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post #5 of 10 Old 03-31-2009, 11:37 AM
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Re: hydro 175

First off - stop going to that Deere dealer - they are obviously clueless in regards to this model.

The tech manual can be had for about $30 via ebay. Covers everything from the 130 to the 185, all aspects of repair. Couple this with JD's online parts catalog and you'll be all set.

The number is TM1352. It's a CD in pdf format, about 18M (too big to email it).

The vent plug on top looks just like the hydro drain plug on the bottom, and it's right beside the filling reservoir.

I'd strongly recommend you get the tech manual if you intend to work on the tractor and keep it for a long time.

JMJ
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post #6 of 10 Old 04-01-2009, 05:50 PM Thread Starter
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Re: hydro 175

mine had a fitting to the left of the filler tube under the seat. Is this it on my mower?

I don't see a "plug" near the res. I can't see the top of the res. It is below the body of the mower?

This fitting has a knurled cap on it. Looks like it might be to turn and let something com eout...?

I feel stupid when it comes to this stuff.


Thanks again!
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post #7 of 10 Old 04-02-2009, 08:35 AM
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Re: hydro 175

Yep, that's it. The filler tube is the "reservior".

JMJ
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post #8 of 10 Old 04-03-2009, 01:58 AM
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Re: hydro 175

The Hydro in this tractor takes 30W. Mine does in the 165 and I am sure it is the same hydro.

1986 John Deere 165 Lawn Tractor.

2007 Sears Craftsman LT1000 Lawn Tractor.

Late 1950's Jacobson 2 1/4 horse 2-cycle.


1988 Lawnboy 8480. 4.5 horse F engine.

1996 White 3.75 horse Briggs(traded for a 1995-97 John Deere 14SE). 5.5.horse Kawasaki engine.
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post #9 of 10 Old 04-03-2009, 09:47 PM
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Re: hydro 175

Hey are the 175's a very good mower? A guy came and bought a new mower last fall and since they wouldn't give him anything on trade he just gave us his 175. Now it has been setting out side and looks kinda rough but engine oil is clean. do any of you think it would be worth messing with. I've not worked on many of the older deere mowers such as a 175. I've already dug out a tech manual and an ops manual if they let me bring it home, and I think I'm the only one interested in it. Thanks for any input
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post #10 of 10 Old 04-04-2009, 03:33 AM
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Re: hydro 175

In some ways they are more sturdy than a lot of todays models. They are mostly metal. The Kawasaki engine is one of the best.

1986 John Deere 165 Lawn Tractor.

2007 Sears Craftsman LT1000 Lawn Tractor.

Late 1950's Jacobson 2 1/4 horse 2-cycle.


1988 Lawnboy 8480. 4.5 horse F engine.

1996 White 3.75 horse Briggs(traded for a 1995-97 John Deere 14SE). 5.5.horse Kawasaki engine.
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