Anyone rebuilt the JD pilot valves,490,892,hoes, just need approx time to seal up, r&r, gotta squeeze the repairs in in the evening. thank Russ
It's been some time since I've installed new seals in a Deere/Hitachi joystick control valve, can't really remember much of the details. I will say it is a bit of a time consuming project, and if it's your first go around, be patient. The biggest pain is dealing with the consoles and taking them apart. I can't remember for sure, but it may require seat removal to work on the inboard console, don't hold me to that though. It's possible to do this repair in the evening. You might find it falls into doing one, then the other one on the next evening.
As I recall the 490 was a Deere design and only required pulling the linkage and topping plate below the handle. You could pull the pistons out with a pliers and the caps had the seals in them. I don't think I spent more than three hours per side. The 892 I'm not sure of. On the older units getting the boots off with out tearing them up was the hard part. But then again by the time I got to them the boots were already gone. Can't tell you much about the newer Deere machines. Good Luck!
i assume rebuilding these would keep the hydraulic oil off my floor in the kobelco? it is kinda annoying, but is there any other reason to rebuild them? they seem to work just fine. i have been toying with the idea of doin it for a while, i just have not made it a priority yet. thanks.
Yep, it has no effect on operation of joysticks, but makes a helluva mess in your cab. Well worth the trouble to repair.
atco, i think mine have been leaking a long time... my floor mat is eaten thru completely in two spots under the joysticks, lol. what all do they consist of? i am currently designing and building a hyd thumb, well turning mu mech thumb into a hyd. but maybe after that is done i will work on those joysticks. hope it dont cost too much.
Well, I haven't done this repair on a Kobelco, but typically the seals involved are not terribly expensive. It just drives me bonkers to look in a cab and see the floor all slimy. Nasty mess it is. :yup
10-4 on that one. if i sat in the thing all day every day i would sure care more, but i am in it onlye here and there, mostly in the evening, for a few hours is all. tryin to find some more work for it, but surly not quitting the day job yet. i will sure try to getter fixed this winter when things slow down some.
Biggest thing to watch out for is that the pushers/plungers are different front to back from side to side as well as the springs. So "MARK" everything. If you order parts, order the plunger assemblies. This will give you the plunger, the seal and the holder all as one. Usually they are all worn. Also check your universal joints as they are usually worn out as well. Ask for a parts breakdown to help you. Or go onto JD parts online and print off the page you need. Time? Can be a quick job if all goes right and you have done it many times. Or you can be all night if things don't go well.
Thanks for the info, already got the seals and stuff, all the same parts for the 892 and 490. Hand or propel controls, so I will take a chance on the plungers and do them later if need be. Didnt leak till we put the shear on and started getting the oil REEAL hot. Thanks Russ
Update, just had to remove the top plate and bushings, went well..Now we can test after the cylinder repack, no fun on this big tight nut stuff.
hey guys im haveing almost t the same problem with my 892elc the hydrualics are acting slow under full power i have replace every filter on the machine the throttle doesnt not speed up when i touch the joysticks this may be a cause of the slow fuctions of the hydrualics can some tell me where is the motion senor or the a wire diagram of the machine