JD790 Rear Hydo  s: John Deere Review  -- John Deere Tractors Discussion Forum and Review JD790 Rear Hydo s: John Deere Review -- John Deere Tractors Discussion Forum

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 07-30-2004, 16:25 Post: 92308
bmlekki



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 JD790 Rear Hydo s

Hey guys,

When I bought my tractor I asked my dealer for rear hydo hook-ups. They just came in and are being installed. I stopped by this afternoon and I found out that they are only lines connected to bucket dump lines for the FEL. Not at all what I was expecting. What do I need to be able to do the following?

Have Full functionality of the FEL and be able to have and open hydo line to set up a valve for the turning of a snow blower shoot, and another for the deflector.

Is the Power Beyond what I really needed? $$ís ??

I think it was DRankin, or "R1-Ken",Laughing out loud, -kwschumm, had a really cool set up of valves mount on the right and side above the wheel well.

Any thoughts??

Thanks,
Brian






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 07-30-2004, 17:24 Post: 92310
kwschumm



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 JD790 Rear Hydo s

R1-Ken? Laughing out loud I've got 5 SCV's and PB on my 4310. I'm not sure what is available from JD on the 790, but I will speculate that they may be installing a diverter valve and reusing the FEL valves for the rear. This may or may not be what you want. This type of setup would require you to flick a switch one way to operate the FEL and another way to operate the snowblower equipment. I don't think PB is what you want - it supplies full hydraulic flow to the rear but no operator controls. Usually PB is used for stuff like backhoes or log splitters that have their own control valves.






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 07-30-2004, 18:02 Post: 92313
DRankin



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 JD790 Rear Hydo s

Agreed. I have Power Beyond.... just an hydraulic tap.... no valves. There has to be a diverter valve someplace in your new set-up.






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 07-31-2004, 07:04 Post: 92358
TomG

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 JD790 Rear Hydo s

A diverter or multiplier setup would work and might be OK if loader and 3ph implement work aren't mixed and matched very much. Most of my work isn't like that and I think having to swap back and forth would drive me nuts no matter how easy it might be.

The easy way to get additional circuits is to add a valve section to an existing valve assembly but that can't be done on most joystick loader setups. It's not too difficult or expensive to splice an additional PB valve assembly into the PB line from the loader valve. If it is a two return line type, the low-pressure return can be spliced into an existing low-pressure line with a t-fitting or run directly to an unused port on the cases.

There are some losses anytime extra components are added to a full flow line but they shouldn't be significant for most work. The oil will run a bit hotter. Some types of valves and connectors have less loss than others. I tend to think of power beyond more as an application in open centered systems than as hardware. Almost all loader valves are PB since the 3ph is ordinarily downstream from them.






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 07-31-2004, 12:35 Post: 92376
Chief



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 JD790 Rear Hydo s

I believe you can go with either a 3rd SCV or the Rear Auxiliary Hydraulic Line Kit or most probably both are what I would consider. P/N BM18005 $244.80 USD The 3rd SCV will cost much more. The kit comes in a hyd. line kit and a separate SCV valve and lever. Anyhow, hope this gives you some kind of visualization of the options.






Link:   Rear Auxiliary Hydraulic Line Kit 

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 07-31-2004, 21:44 Post: 92399
bmlekki



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Is Power Beyond a JD thing or industry? I noticed in nothern tool, that they have Power Beyond Valves?






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 07-31-2004, 22:40 Post: 92406
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I've always thought JD invented the name and it ended up in common usage, but I could be wrong.






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 08-01-2004, 05:24 Post: 92417
TomG

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 JD790 Rear Hydo s

I'd expect the Northern valves identified as PB types would have two return ports. Single return port types may or may not be PB rated, but I'd assume they aren't.

The PB issue has to do with how much pressure the exhaust oil galleys on single return types are designed to withstand. Operating a single return type opens the exhaust port to a line that goes to the input of a downstream valve. If the downstream valve (e.g. the 3ph) is in lift mode, the upstream valve exhaust galley sees the full working pressure. The return ports of many single return types are intended to go directly to the reservoir and high pressure can't be developed unless an obstruction were present. Two return port types separate the PB and cylinder exhaust flows.

A curiosity with single return types in PB applications is that if an upstream and downstream valve is operated at the same time, exhaust oil from the upstream valve moves the downstream cylinder, which may or may not be desirable. The working pressure is the total of both loads.

I think JD sometimes does have a languish of their own--sometimes it catches on and sometimes not. I have a JD manual that refers to a governor adjustment it calls 'speed droop.' I don't know how common the term 'speed droop' is.






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 08-27-2004, 12:21 Post: 94713
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Chief,

I'm looking at JD Parts and it says: Part Details

Part Number: BM18005
Part Price: 204.00 USD
On Hand: 0 Check Other Stores
Description: REAR AUX. HYD. KIT (670/770/790) NA (Part is Obsolete)

OBSOLETE???????
Is there a different part number??
Brian






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 08-27-2004, 12:54 Post: 94716
Chief



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I am not certain why John Deere does that. I have orderd MANY parts to include the arm rest kit, and rental upgrade kit which are also listed as obsolete and recieved them. You can still order the parts. The dealer parts man has the responsibility to local that part either in the parts system or at another dealer nation wide. I will email Deere and ask them what this means. To my knowledge there is no other part number although I am sure there is always an exception. If those are the parts you want; go ahead and order them through your dealer or the Deere Parts website. If you run into problems; let me know and I will see if I can get my friend who is the parts manager at my Deere dealer to help out. He has always come through for me so far.






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