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Ford 9N, 2N & 8N Discussion Forum

Hydraulic Specs

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11-14-2006 13:33:49

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I am needing specs on the three point hydraulic system of an N series tractor. Things like max pump pressure, max pump flow rate, lift piston bore and stroke, max lift capabilities etc.. Does anyone have these readily available.

Rocky in MO

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11-14-2006 17:34:44

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 Re: Hydraulic Specs in reply to RockyMO, 11-14-2006 13:33:49  
Try this link - hope it helps you a bit for what you need.


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Dell (WA)

11-14-2006 16:12:05

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 Re: Hydraulic Specs in reply to RockyMO, 11-14-2006 13:33:49  
Rocky..... ...ya ask a bunch a "technical questions" for what reason? Ya plannin' on re-inventing the wheel ...er... hydraulic lift?

I don't know what the hydraulic cylinder bore and stroke is.

The I&T FO-4 lists the scotch-yoke pump at 2.85-gpms and the corner pressure test port at 1500-1700psi at 1500rpms. The N-Owners manual lists the hydraulic pump at 2.15-gpms at 1500rpms and 2.85-gpms at 2000rpms. It only list hydraulic pressure specs 1500psi min.

Most well used N-Tractors gitt-by on about 2-gpm and less than 1500psi.

The 3-point 11-hole drawbar lift ranges from 8-1/2 to 34-1/4 and 18 is standard operating height.

The other 3-point specification you should be aware of is the 11-hole drawbar is 26" between 7/8" pins. The top-link is a 26" vertical-"T"-distance from the ll-hole drawbar with 3/4" pins.

As as good rule of thumb the hydraulic lift capacity is about 800# before the frontwheels start flappin' in the breeze because of the SHORT wheelbase. Iff'n you chained the front wheels down so they couldn't lift, then the rear lift arms can lift about 1200# before the internal safety valve pops-off. This why you can't carry roundbail hay on a 3-point spear, too heavy..... ..HTH, Dell

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11-14-2006 16:34:35

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 Re: Hydraulic Specs in reply to Dell (WA), 11-14-2006 16:12:05  
Hi Dell, and thanks for the info. Your right on two counts, 1. It is a lot of technical questions. 2. I am trying to reinvent the wheel ahhh I mean the hydraulic system. I spent my entire working career as a journeyman auto mechanic for Ford/Lincoln Mercury dealers (about 25 years). I recently decided to go back to college and get a degree that will allow me to become a teacher. This is so that I can teach others how to make a living with a wrench and say bad words. One of the courses I am taking is a hydraulics course and I have to teach some sort of lesson to the class about a hydraulic system. I chose the N series hydraulics. Unfortunately I can't just say the fluid flows here and the implement lifts here. Instead I have to produce a lot of mathmatical equations and such to prove that this pump will lift this much etc.. In order to do these calculations I sort of have to reverse engneer the hydraulic system. I know this is a long post but it was the only way to exlain why I need unusual stuff.

Rocky in MO

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11-14-2006 15:53:13

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 Re: Hydraulic Specs in reply to RockyMO, 11-14-2006 13:33:49  
Wellll, not sure this is what you are needing, but here's what I have in the 8N owner's manual under "Hydraulic Control":
Maximum pressure: 1500-1700 psi
Capacity: 2000 engine RPM - 2.85 gals per min.; 1500 engine RPM - 2.15 gals per min.

Sigh. That's a pretty short list, huh. Well, maybe it's a good start and others can add to it. :-)


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