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powerhawk56

C-175 Lift

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powerhawk56

I have a 1981 C-175 when I raise the deck up it won't stay up, it'll slowly lower itself. I have not noticed any oil under the tractor. Do I have a pump going bad or need to add oil somewhere? What do I look for?

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Kelly

Sounds like the lift control valve maybe leaking internally, I've never rebuilt one but I hear most are rebuildable, with a few O rings, the hard part on your tractor will be getting it out of the dash.

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Butch

Yep, just a couple O rings!

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bigd

its not hard there are 6 o rings i rebuilt one out of my c141 a couple weeks ago.they are right the hard part is getting it out of the dash. : :hide:

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powerhawk56

The dash? near where the key light switch, etc is? I was thinking it was going to be near the trans under the seat.

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c175inMA

nope i believe on the 81s the control valve is right under the dash i believe that the control lever is connected directly to the valve. :hide:

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powerhawk56

I'll have to look into that this next week when I have it apart to change the idler pulley for the trans. So does the hydros use the oil out of the trans or is there a pump off the trans? And if I goto tear this apart is there a bleeder valve to vent air out of the system>? I think I need to find myself a manual for this tractor.

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racinfool40

yep the control valve is located in the dash tower and are they a pain to remove!!!!

Here is the ops. Manual hope this help a little:

http://www.mywheelhorse.com/graphics/file/...OM_810302R1.pdf

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powerhawk56

yes :hide:

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shorts

I would think that the lift cylinder piston seal/packing is the culprit unless you have an external leak/drips on the floor etc. I don't remember ever seeing a spool valve with seals on the internal parts of the spool, they usually have an o-ring or wiper/dirt seal at the ends of the housing but just tight clearances for the internal seals between the bore and spool. stacked spools will have o-rings between the sections and the fittings will have an o-ring between the fitting and body if it's not NPT. For what it's worth, o-rings used in hydraulic systems are usually 90 durometer (hardness) compared to standard o-rings 60 durometer, found in the generic o-ring selections.

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