NA73 70 #1 Posted May 21, 2022 been a while since I've posted anything. but got a minor annoyance with a '93 520h I bought last year. it has a 42" RD mower deck on it and if I park the machine with the deck raised up, after a few days the deck creeps down to the ground. over the winter I had a ber-vac 2-stage snowblower on and it never creeped down. The forces are opposite on the lift arm/rock shaft - the deck pulls down and the snowblower pushes up. with that being said: is this normal for the eaton hydros or is there maybe some internal leak in the valve or lift cylinder? Share this post Link to post Share on other sites
pfrederi 17,741 #2 Posted May 21, 2022 Internal leakage in a 29 year old hydro system is certainly not unusual. to not have leakage after 29 years would be very lucky. Has nothing to do with eh Eaton pump it is either the lift cylinder or the control valve. 3 Share this post Link to post Share on other sites
NA73 70 #3 Posted May 21, 2022 (edited) just seems weird to me that the valve or cylinder would only leak by in one direction. edit: after a bit more thought, seems more likely it's the valve. Edited May 22, 2022 by NA73 Share this post Link to post Share on other sites
pfrederi 17,741 #4 Posted May 22, 2022 There are two seals in a cylinder and two in a control valve seems to me failure of one would lead to a leak..in one direction 1 Share this post Link to post Share on other sites
Handy Don 12,235 #5 Posted May 22, 2022 19 minutes ago, pfrederi said: There are two seals in a cylinder and two in a control valve seems to me failure of one would lead to a leak..in one direction More sophisticated control valves would have internal check valves, though these have seals and seats too! Nevertheless, normal for storing a hydraulic system is to relieve all pressure throughout. If you need to suspend the snowblower, put blocks under it and then when the engine is off, lower it onto the blocks. Same for a deck. 1 1 Share this post Link to post Share on other sites
cleat 6,042 #6 Posted May 22, 2022 Yes, even my larger loader tractor will slowly drop the loader or 3 point hitch implements over time. I normally lower everything when I am done with it either onto the ground or onto wood blocks. 2 Share this post Link to post Share on other sites
Dan.gerous 2,696 #7 Posted May 22, 2022 8 hours ago, cleat said: Yes, even my larger loader tractor will slowly drop the loader or 3 point hitch implements over time. I normally lower everything when I am done with it either onto the ground or onto wood blocks. We are the same, always lower everything. It seems less of a hazard on the ground than a bucket or whatever up in the air. Share this post Link to post Share on other sites
