powerhawk56 0 #1 Posted May 26, 2011 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? Share this post Link to post Share on other sites
Kelly 1,033 #2 Posted May 26, 2011 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. Share this post Link to post Share on other sites
Butch 194 #3 Posted May 26, 2011 Yep, just a couple O rings! Share this post Link to post Share on other sites
bigd 0 #4 Posted May 26, 2011 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: Share this post Link to post Share on other sites
powerhawk56 0 #5 Posted May 26, 2011 The dash? near where the key light switch, etc is? I was thinking it was going to be near the trans under the seat. Share this post Link to post Share on other sites
c175inMA 8 #6 Posted May 26, 2011 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: Share this post Link to post Share on other sites
powerhawk56 0 #7 Posted May 27, 2011 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. Share this post Link to post Share on other sites
racinfool40 203 #8 Posted May 27, 2011 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 Share this post Link to post Share on other sites
shorts 182 #10 Posted May 27, 2011 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. Share this post Link to post Share on other sites
