4320 (Old) Loader hydraulics- need help plumbing a supply.

oconnor368 · Jun 28, 2016

I have a 4320 that I am trying to rework the hydraulics on a 158 loader for so that I can eliminate the need to use the two rear ports on the tractor, and instead go a a 3 spool valve in the cab so that I can run a hay grapple in addition to the loader. I have seen the posts explaining how to do this on the 4020 by placing tee's near the brake line and hydraulic oil filter. Unfortunately the 4320 is set up differently and so I'm unsure where to tie in at. I have also heard about tapping into the oil filter cover for the return but have not seen any pictures of the finished product. Any help you could give would be greatly appreciated! The John Deere dealer had no idea how to do it so I thought I would reach out to this community. Thanks! Clint

Tx Jim · Jun 29, 2016

For hyd pressure to loader valve one needs to tee into one of the 3 locations where fitting(parts key 2) is located. Preferred location is location farthest to the left of photo which is located under operator platform.

Below is spec's for original fitting(parts key 2))

Modified filter cover

oconnor368 · Jun 29, 2016

That looks fantastic. I'll let you know how it works out! Thank you!

oconnor368 · Jun 29, 2016

I suppose I should confirm that the diagram is of the pressure control valve located to the right of the operators console... Also, what size of fitting and hydraulic line do you recommend for the filter housing return? Thanks!

Tx Jim · Jun 29, 2016

Pressure control valve(parts key 7 1st photo) is next to firewall at rear of engine

Mike M · Jun 29, 2016

IIRC the 158 loader manual shows some of the different hyd. hook ups.

oconnor368 · Jun 29, 2016

Ok, thanks. Thats what I thought. Is this a better option than going with the power beyond block off of an SCV on the rear? I've heard
those flow pretty slowly in comparison to other setups.

tim s · Jun 29, 2016

The power beyond block is about as good as any for your's and they do flow good put it on the left side...bad part is it will set the SCv back 2 inches and interfere with the sheet metal, the other option is splicing into the pressure line under the hood letting a short hose come down to meet your loader valve, I put a coupler in there to aid in un-hooking, or you can keep a JIC cap handy,,,and dumping back into the filter bowl

fdt860 · Jun 30, 2016

I would be afraid to hook anything before the priority valve for steering and brakes

Tx Jim · Jun 30, 2016

I don't advocate attaching FEL hyd's in front of the pressure control but FEL will operate from there. Attaching FEL in front pressure control valve with a hose failure can't be any more traumatic than engine dying going down a long hill. :roll:

4320 (Old) Loader hydraulics- need help plumbing a supply.

oconnor368

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Tx Jim

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oconnor368

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oconnor368

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Tx Jim

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Mike M

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oconnor368

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tim s

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fdt860

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Tx Jim

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