420 hydraulic schematics

[pauly68]

Hello All,

I'm working through a bunch of little issues on my dad's old 1955 JD 40C. It has a Gladden-Haas 6' front blade on it, model J-82. It was made in Owosso, MI and I have a print of it dated 1958. Interestingly enough, it says 420C crawler blade on the print.

So, with Lavoy's help, I have been able to figure out that this has 420C hydraulic valves, reservoir and mount on it. I have the 40 manual but don't really want to buy the 420C manual just for the hydraulics section.

Wondering if any one would be willing to copy those and send them to me for fee? Please let me know.

Thanks!

Paul

[dr1zsk1]

Its top secret - only those in the know get to have them.

Check your inbox.

Mike

[pauly68]

Thanks dr1zsk1! Much appreciated!

[Stan Disbrow]

Hi,

Heh. You will, one day, find out you also need the M service manual for the 40c.

Deere wrote the SMs for service shops. They presumed each shop bought them as they went thru time. So, there are things on the M that are the same on the 40 and so not repeated in the 40 SM.

Same went for the 420 I had. I needed all three. And my 420c was Phase III and so had the differential direction reverser in it. So, I then needed the 440 SM just for that one area.

But, you are set for now, which is grand.

Stan

[dtoots1]

On your hydraulic pump...what is the name/model of it?..i cannot remember what my pump is...but they say NLA for repairs etc...am waiting on getting mains..(.030)..for engine..so am not currently able to test for leaks..is front loader believe 90 or 91?

checked my other post...is hydreco pump

[pauly68]

My tractor is a 40C and has that pump. When the blade was added 3 years later, they added the 420c hydraulic valve stack, controls, and reservoir.

[dtoots1]

So is your pump up and working??

[pauly68]

Should be. I just rebuilt the pump but haven’t fired the tractor back up yet. Going to pull the valve stack and see if I can figure out why the fitting going back into the reservoir is leaking so badly.

[dtoots1]

OK..so you rebuilt the pump yourself??? What were you actually able to do to pump and valves??? They tell me parts NLA...i did pull valves and cleaned them..but they did not seem to have any "O-rings" or anything else..pump i did not take apart..

any pics???

[Lavoy]

He has a cam pump, you have a crank pump, two entirely different animals, no similarity other than they both pump oil. There are no service parts available for your pump unfortunately.
Lavoy

[dtoots1]

Thanks Lavoy,

Should have known would be a cam pump...that wont do for loader i have. Will see what happens when get mains, if ever.