This is normally a piece of oring or gasket, or debris that has plugged an orifice in a valve. If you get a stream of oil shooting out of where the lockout valve was installed and the three point goes down, then you have a blockage somewhere in the hydraulic valve system. Note that there is a small valve(you can see it in fig B) that will pop out of the hole so be sure you have something there to catch it. If you do this with anything on the three point the oil will shoot out with a LOT of force and can cause damage or injury. Do not start the tractor! Unscrew the entire lockout valve assembly SEE FIG B. If everything looks good there, you will need to unhook any implements from the three point so that there is NOTHING hooked up to it. If the valve is open be sure that all of the linkages between the valve & the handle seem intact. Three Point Up And Won't Go Down Be sure that your lock out valve is open (usually located between your knees lust under the seat- SEE FIG A). If the three point stays up then you likely have a problem with the three point control valve. If the three point still seeps down then you probably have a bad lift piston oring because, by closing the lock out valve, you have eliminated the valve & everything else in the system. Three Point Won't Stay Up- Leaks Down.Lift the three point all the way up and close the lock valve (usually located between your knees lust under the seat- see fig A). You could have a bad three point control valve. If all of this is ok then you might need to do some more in depth troubleshooting. Be sure that a rod or pin has not fallen out and that the lever actually moves all the way to the valve.

You may need to remove the pump & inspect it for damage if the oil is full & the filters are clean.If you don't have a loader or the loader is working and you have a clean filter & plenty of oil- the next place to check is the linkage going to the valve. If the loader is NOT working then there is something wrong with the pump (normally caused by unhooking the hoses while the tractor is running which dead-heads the pump) or a problem with the oil supply (out of oil, dirty filter or screen?). If the loader is working you can move on to the next paragraph. Three Point Down & Won't Go Up The first thing to check if you have a loader on the tractor is if the loader is still working.

Iseki hydraulic manual valves