ebinmaine 72,782 #1 Posted July 22, 2024 1984 Workhorse GT1800 hydro lift valve needs O-rings. Anything we need to know about disassembly? How to? What NOT to do? Thanks! Share this post Link to post Share on other sites
lynnmor 7,831 #2 Posted July 22, 2024 (edited) There is a screw in the back, remove it and out comes the spool, simple as it gets. Replace the o-rings on the hose connections, if it has them, while it is out. Edited July 22, 2024 by lynnmor 1 1 Share this post Link to post Share on other sites
Handy Don 14,088 #3 Posted July 22, 2024 (edited) Under the acorn nut is the pressure relief valve. No need to mess with that unless there’s a known issue. Recalibrating it requires a hydro pressure gauge and some plumbing bits! Edited July 22, 2024 by Handy Don 1 1 Share this post Link to post Share on other sites
ebinmaine 72,782 #4 Posted July 22, 2024 26 minutes ago, lynnmor said: . Replace the o-rings on the hose connections, if it has them, while it is out. Getting 4 new hoses installed. All have new Orings. 1 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,495 #5 Posted July 22, 2024 3 1 1 Share this post Link to post Share on other sites
ri702bill 9,456 #6 Posted July 22, 2024 O-ring material??? Buna-N may have been the original, better to replace with either Viton or HNBR..... 1 Share this post Link to post Share on other sites
Wild Bill 633 877 #7 Posted July 23, 2024 @ebinmaine It is hard to tell if the valve is an Eaton or not. Check the P/N and if so attached is info. Eaton 30920-30930 Directional Control Valve Catalog.pdf Eaton 30920-309030 Directional Control Valve IPL.pdf 1 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,495 #8 Posted July 23, 2024 An older service manual than the one above. 1 1 Share this post Link to post Share on other sites
c-series don 10,037 #9 Posted July 23, 2024 @ebinmaine I recently rebuilt the same exact valve with no manual. I purchased a rebuild kit many years ago and finally got around to using it. It’s very simple, just take it apart on a clean surface. The hardest part is getting the valve in and out of the tractor. I loosely threaded in the hydraulic hoses and then bolted it to the tractor. I have the part number for the rebuild kit if you need it. 2 1 Share this post Link to post Share on other sites
oliver2-44 10,738 #10 Posted July 23, 2024 (edited) On reassembly coat the O-Rings with a lite film of grease to help the spool slide through the housing. Edited July 23, 2024 by oliver2-44 4 Share this post Link to post Share on other sites
