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oldude 10-21-2012 07:25:09 75.224.182.102 Report to Moderator	How big a job is it to replace the cam follower pin in an 8n lift system. Any special tools involved? [Reply]   [No Email]
oldude 10-21-2012 12:50:48 75.207.166.32 Report to Moderator	Re: 8n lift system in reply to oldude, 10-21-2012 07:25:09   Thanks a lot. That answered all my questions. I believe I can do it now.I"ll order the jig, do some tests to see how long the lift hold after shut down and order parts accordingly. And thanks for the pictures too. [Reply]  [No Email]
Bruce (VA) 10-21-2012 14:25:08 24.125.80.178 Report to Moderator	Re: 8n lift system in reply to oldude, 10-21-2012 12:50:48   You're welcome. Glad to help. Post back w/ other questions or results. 50 Tips [Reply]  [No Email]
oldude 10-21-2012 09:56:36 75.249.16.169 Report to Moderator	Re: 8n lift system in reply to oldude, 10-21-2012 07:25:09   Because to get the lift to raise I had to move the quadrant mount all the way to the rear to get the lift to raise. The pumps in good shape because I can go through the side and operate the valves by hand, and it operates nicely. What else could it be? I could continue to run this way but I don"t have very precise control on my empliments. [Reply]  [No Email]
Bruce (VA) 10-21-2012 10:18:44 24.125.80.178 Report to Moderator	Re: 8n lift system in reply to oldude, 10-21-2012 09:56:36   It could be the cam follower pin, adjustment or a combination of both. Before you start, you need to make a decision regarding fixing everything while you're in there or just adjusting the internal linkage & replacing the cam follower pin. If it will hold a disc or bush hog up an hour or so w/ the engine off, then disregard all that follows about the lift piston & cylinder. If the lift drops in 5 minutes w/ the tractor off, then you really do need to replace/repair it. Anywhere between 5 minutes & a couple of hours is a coin toss. Get a jig from Zane Sherman ( http://pwp.att.net/p/s/community.dll?ep=16&groupid=220626&ck= )to adjust the internal linkage. And, make a couple of “guide studs” by cutting the heads off of two 7/16-14 x 3 5/8” bolts. Also, if your lift cylinder rebuild kit has the leather washer, get CNH part number 87051231 which is the neoprene washer for the lift piston instead of the leather one. The lift cover weighs nearly 100 lbs with the upper lift arms attached, & is very hard to maneuver. An engine hoist is an excellent idea. Remove the seat and spring, disconnect the upper lift arms at the knuckles. Remove the 14 bolts that hold the cover to the housing. (note that there are three different lengths) DO NOT remove the four nuts under the seat! Remove the right side inspection cover so you can remove the control rod tip from the pump intake valve. Lift the back of the cover straight up and slide a piece of wood under the cover to keep the tip of the control rod out of the rocker shaft. Once you are sure the control rod is out of the rocker shaft, you can then remove the cover. Turn the cover upside down, remove the four bolts that hold the cylinder to the cover, & use a little compressed air on the cyclinder to remove the piston. Check the cylinder for excessive scratches, hone if necessary. Install a new piston with "0" ring and backing washer in the cylinder. Install the CNH neoprene washer w/ the concave side toward the “O” ring. At this point, check the cam follower pin & the control rod. If the cam follower pin is worn replace it. Then, if you have a jig, adjust the linkage to specs. The ‘shade tree’ adjustment was to bend the control arm to compensate for normal wear in the linkage, springs & cam follower pin. If the control rod is bent, remove it & straighten it. (very carefully; they break easily!) Replace the gaskets under the cylinder and bolt it back on the cover. Put the gasket on the tractor (no sealer) and put the gude studs in place. Unless you do this every day or have eyeballs in your finger tips, get some help to guide the tip of the control arm back into the rocker shaft. (this is the point you will wish you had a engine hoist to hold the top cover while the control rod dances around the intake valve arm on the pump!) Align the cover holes up with the housing holes. Remove the guide studs. Tighten cover bolts, connect lift arms install the seat. Re-install the inspection covers with new gaskets. No need for a press on the cam follower pin. Just support the arm to keep it from bending & tap it out w/ a drift. 50 Tips [Reply]  [No Email]
jrykpp 10-28-2012 18:12:36 50.105.152.192 Report to Moderator	Re: 8n lift system in reply to Bruce (VA), 10-21-2012 10:18:44   Just saw the post I have a 9n and the lift drops in less than 5 min. Is there a way to set it to stay up when in use? This post was edited by jrykpp at 18:58:59 10/28/12. [Reply]  [No Email]
Bruce (VA) 10-28-2012 18:31:39 24.125.80.178 Report to Moderator	Re: 8n lift system in reply to jrykpp, 10-28-2012 18:12:36   If the lift drops while it's running, you have a problem that needs fixing. If the arms drop w/ the tractor off or the clutch depressed, chances are you have a worn lift cylinder or piston (or both), a blown top cover gasket or a leaky pressure relief valve. Take the inspection plate w/ the dipstick off. Lift a heavy implement & look inside w/ the tractor running & the PTO engaged to see if you notice oil running from the top cover. If oil is running steadily from the top cover the chances are the lift cylinder needs to be rebuilt. It’s less likely, but a possibility, that the top cover gasket is bad. (It’s very difficult to detect the exact source of the oil leaking inside of the top cover while looking through the inspection port). If no oil is running down from the top cover, look at the rear of the pump in the oil with the load still on it and see if you notice turbulence in the bottom. (Some movement of oil will be normal with the PTO shaft turning). You could have a weak pressure relief valve which will be detected by turbulence in the oil. To check for a slow leak, lift a heavy implement, turn the tractor off & put a ˝ inch clear plastic hose on the end of the valve & stick the other end of the hose through the inspection port. With pressure in the pump, a bad valve will likely show some fluid in the hose. 50 Tips [Reply]  [No Email]
jrykpp 10-31-2012 19:35:30 50.105.144.21 Report to Moderator	Re: 8n lift system in reply to Bruce (VA), 10-28-2012 18:31:39   This is on a 9n. Is that similar to the 8n? I can't really do that because i don't have a live pto. Sorry if I sound like I don't know anything but this is my first tractor and I have a lot to learn. This post was edited by jrykpp at 19:37:20 10/31/12. [Reply]  [No Email]
Bruce (VA) 10-31-2012 19:46:22 24.125.80.178 Report to Moderator	Re: 8n lift system in reply to jrykpp, 10-31-2012 19:35:30   " This is on a 9n. Is that similar to the 8n?" Close enough at this point. The tests are the same. " I can't really do that because i don't have a live pto" What is it you think you can't do? " this is my first tractor and I have a lot to learn" not a problem; nobody was born w/ tractor knowledge. do you have the manuals? (tip # 39) 50 Tips [Reply]  [No Email]
jrykpp 10-31-2012 19:56:26 50.105.144.21 Report to Moderator	Re: 8n lift system in reply to Bruce (VA), 10-31-2012 19:46:22   Not yet. Just aquired it a week ago. Oh ya I can run the pto when the tractor is in nuetral. Like I said I have a lot to learn. I have only had it a week and I've been gone most of that. I'll have to order the manuals and read through them . The guy I got it from said he would take a look at it so I will have to let you know what happen. Thanks [Reply]  [No Email]
Bruce (VA) 10-21-2012 07:28:36 24.125.80.178 Report to Moderator	Re: 8n lift system in reply to oldude, 10-21-2012 07:25:09   Pressing the old one out & putting a new one in isn't all that hard......assuming it's a real cam follower pin in there & not a cut off drill bit or some other 'farmerized' fix. Do you already have the lift cover off? Do you have Zane's jig to adjust the internal linkage while you're in there? 50 Tips [Reply]  [No Email]
oldude 10-21-2012 09:17:47 75.249.104.121 Report to Moderator	Re: 8n lift system in reply to Bruce (VA), 10-21-2012 07:28:36   No, I haven"t started the job yet. Still in planning stage. What is Zane"s jig and how do I get one? Also what kind of press do I need? [Reply]  [No Email]
HCooke 10-21-2012 10:58:25 70.195.65.63 Report to Moderator	Re: 8n lift system in reply to oldude, 10-21-2012 09:17:47   To remove the pin I backed it up on one side with a socket and drove it out with a drift. To get Zane's jig check his web site. I have one that I have used several times. I also adjusted a lift by following the instruction in the I&T manual. Zane's jig is much easier. Zane [Reply]  [No Email]
Bruce(VA) 10-21-2012 09:36:54 24.125.80.178 Report to Moderator	Re: 8n lift system in reply to oldude, 10-21-2012 09:17:47   " Still in planning stage" Then how do you know it needs a cam follower pin? [Reply]  [No Email]