Combines Help hydro trouble

A few years ago I had the hydro rebuilt on my l3, it also is a Dennison. The place I went did a very good job but it took a long time because he had to wait for the parts. I'm not sure if anyone could have done it faster but it was durring the winter so it didn't matter. I would try calling some of the larger AGCO dealers and see what they say. Most should know a place that could rebuild it for you. I know I have seen a booth at several farm shows of a company that specializes in hydraulic repair, I just don't remember there name. Oh and the older Gleaners used a Dyna-Power hydro.

An external leak is good. If you would detect what is leaking it is likely easy to fix for anyone that does some hydralic work. If it is a input or output shaft seal you could have support bearing for shaft failing. This still isn't a bad job and does not require total hydro teardown. It could be as easy as loose bolts holding on shaft seal plate. I'd determine what is exactly leaking and go from there. The Denison is a very good hydro so I'd see about having leak patched up. The Sundstrand hydro could be set into this machine but I think you could find proper Denison just as easy. You could likely even slip in an older Dynopower but that would be a step backwards. If the guys fix your Denison and have to remove valve from center manifold be sure they use some grease or vasaline to hold needle centered in manifold when reattaching the valves. Best of luck.

Delray, I agree with Dan,determine where leak is coming from and then decide feasbility of fixing. Input shaft seal will require a special tool to remove quill from nose of hydro for input seal replacement. Seal assy. the last time I put one in about 3 yrs. ago was over $200. It was a real bn@*ch to put in as hydro was still in combine. We had to even heat the quill to get it to break loose.(lH Thread) Make sure you get an estimate if you take it to a hydro repair shop. You can easily get over $3000 in the drive assy. of the hydro without even taking hydro apart. You can check salvage yards for replacement and the serial number range will be (N5_6201-7100,N6_7701-8800,and N7_4801-5500)for the same hydro that you are running. I have converted back to the Dyna-Power hydro which isn't that hard to do. If you can't find an exact match to what you have Dyna-Power would be an inexpensive route to go.($750-$1000) Hyper Harvest II

Hyper, Thanks for your help. Do you know if anything would have to be changed on the machine in order to bolt a Dyna-power in. I can get one of those quickly and cheap to get going and then figure out the Denison in the off season. It's leaking mainly around the output seal as far as I can see. I really appreciate the advice from everyone I'm totally out of my realm of knowledge whe it comes to hydros.

If you decide to go with the Dyna-Power make sure you get the bell housing plate that bolts to trans. and also the plate that bolts to frame member,and the bracket that holds control cable. Then I replaced the large steel line on top of hydro with a hyd. hose and if I remember right the small hose on the front of Denison will hook to the tee fitting on top of Dyna-Power.There was a second hose on some Denisons that went to dump valve and hooked to (Oh Sn$t)pedal on floor. I always eliminated this dump valve as it caused more trouble than it was worth. Hyper Harvest II

If it is leaking from output seal area. Check the bolts that hold the seal plate on. I beleave them bolts are sealed with nylon washer. I've saw many of them loose and all you have to do is snug them back up. Otherwise the output shaft seal could be pulled after hydro is removed so you can see if the support bearing is going out. Shaft will just pull out of hydro if you need to replace bearing. Good luck