Hydraulic Top-Link Installation w/ Diverter Valve

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Hydraulic Top-Link Installation w/ Diverter Valve

Postby LFEngineering » Fri Dec 27, 2013 8:17 am

As noted yesterday I received a hydraulic top-link, diverter valve, hoses & fittings for Christmas. I though it would be more useful and searchable if I gave it a better more descriptive title.

The following outlines my installation of Agri Supply's Cat 1 hydraulic top link, the rest of the supplies were sourced thru Surplus Center online.

Parts:
1 2" bore x 8" stroke Cat 1 Hydraulic Top Link
1 3/8" NPT 20 GPM PRINCE SELECTOR VALVE
1 9-6506-6-6 JIC 6F TO 3/8 NPTF SWIVEL
1 9-2404-6-6 JIC 6M x 3/8 NPTM CONNECTOR
1 903-3872 3/8" X 72" 3/8 NPTM X 3/8 NPTM 3000 PSI HYD HOSE
1 903-3824 3/8" X 24" 3/8 NPTM X 3/8 NPTM 3000 PSI HYD HOSE
1 9-7381-F FEMALE QUICK COUPLER
1 9-6347-A 3/8" MALE TIP S41-3
2 9-6806-8-6 SAE 8M x 3/8" NPTM 90 ELBOW

(Not Used - Optional Return)
1 903-3848 3/8" X 48" 3/8 NPTM X 3/8 NPTM 3000 PSI HYD HOSE
1 9-5605-6-6-6 3/8 X 3/8 X 3/8 NPTF TEE
1 9-5502-6-6 3/8 NPTM to 3/8 NPTF 90 ELBOW
2 9-4404-6-6 3/8 HOSEBARB TO 3/8 NPTM ADAPTER 4404-6-6
1 9-7381-F FEMALE QUICK COUPLER
1 9-6347-A 3/8" MALE TIP S41-3

Parts.jpg
Parts.jpg (235.72 KiB) Viewed 239 times

Valve Parts.jpg
Valve Parts.jpg (355.42 KiB) Viewed 239 times
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Re: Hydraulic Top-Link Installation w/ Diverter Valve

Postby LFEngineering » Fri Dec 27, 2013 8:23 am

Like most projects good planning makes for good results. I sketched up a bunch of different hydraulic circuits options before choosing this one. The plan was relatively simple, remove the existing hydraulic line from the factory "T" and install a diverter valve. This would allow me to use the factory lift-lower valve to control either the 3 point lift or the top link. Little side note, I have a belly connection which dead-ends at a quick disconnect, If I had a belly cylinder it would not be effected by the selection of the diverter valve as the valve is placed after the "T" in the system.

Finding a home for the diverter valve was the hardest part of the project. There is limited space & lots of moving parts in the tunnel. I would have loved to have mounted the valve in the factory location however the 24" supply hose limited my mounting options. In the end I'm happy with it's final location.

1 TEE CONNECTION.jpg
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2 VALVE HOSE.jpg
2 VALVE HOSE.jpg (280.16 KiB) Viewed 237 times


3 VALVE MOUNT.jpg
3 VALVE MOUNT.jpg (322.44 KiB) Viewed 237 times
Last edited by LFEngineering on Fri Dec 27, 2013 8:55 am, edited 1 time in total.
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Re: Hydraulic Top-Link Installation w/ Diverter Valve

Postby LFEngineering » Fri Dec 27, 2013 8:49 am

Up to this point the instillation had go exactly to plan, eager to test it out I decided to skip the return line installation and give it a shot. The system worked as expected; push the diverter valve down and lever controls the 3 point. Pull the valve up, the 3 point locks in position and the lever controls the top-link.

Inadvertently this eager testing proved to be very insightful. It seems the multi-hitch and forks by themselves don't have enough weight to extend the top-link. I believe this is part due in fact to the top-link having new tight seals and because it was originally designed as a dual action cylinder. 10-20 lbs at the end of the forks and the top-link extends no problem. This got me thinking; I decided to extend the top-link all the way and re-install the steel plug on the cap side of the top-link cylinder. This creates an "air spring" effect which extends the top-link when "lowered".

Now if you've been paying attention you may be wondering what this return line was all about. Since I didn't intend on using a plug on the cap side of the top-link I needed a place for the cylinder to vent while keeping contaminates out. I also designed the system for a seal failure, if the top-link seals leaked or blew-out the oil would by-pass and dump back into the tank / transmission. The return line would have been spliced into the soft return hose in the tunnel. I may still install the return line and just not connect it to the top-link. That way if I want to hook up some other hydraulic accessory I have pressure & return quick disconnects available.

4 REAR CYL.jpg
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5 INSTALLED.jpg
5 INSTALLED.jpg (343.3 KiB) Viewed 232 times
Last edited by LFEngineering on Fri Dec 27, 2013 8:58 am, edited 2 times in total.
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Re: Hydraulic Top-Link Installation w/ Diverter Valve

Postby LFEngineering » Fri Dec 27, 2013 8:50 am

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Re: Hydraulic Top-Link Installation w/ Diverter Valve

Postby Bill Hudson » Fri Dec 27, 2013 10:54 am

Excellent!!! Well done pics, video and narrative.

Bill
"The probability of life originating from accident is comparable to the probability of the unabridged dictionary resulting from an explosion in a printing shop." Edwin Conklin, biologist
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Re: Hydraulic Top-Link Installation w/ Diverter Valve

Postby twotone » Fri Dec 27, 2013 8:00 pm

Very neat, clean installation. Your planning paid off!!
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