640 Lift cover is off

pburchett · Feb 10, 2019

I took the lift cover off to see if I could find out why my lift acts weird while I am waiting on parts. It would not go up over 1/3 the way and sometimes playing with the draft control would allow it to raise some. I think I found the problem. I think it is called a cam follower pin. Is this correct?

How do I get this pin out? Can it be done with everything intact as it sits, or do I have to disassemble everything? I really do not want to get the hydraulics out of adjustment.

Is there an adjustment procedure for dummies so I may check the adjustment before I reassemble the lift cover as it is a little on the HEAVY side.

I also plan on installing a new piston o-ring as the bore looks good. Any suggestions on this procedure or is there anything else I should do while I have it this far apart.

JMOR · Feb 11, 2019

Amazing! Unless you have cleaned it up, that is the cleanest old one I have ever seen. Using a 'backup' heavy bar and hammer,I have driven them out in place. Some devise clamps to more or less 'press' them in/out & others disassemble & use a real press. One of the most common problems with these lifts is the unloader valve, so if it were me doing the work, I would replace the O- ring on it with the proper O-ring while I had it out.

TinCan · Feb 11, 2019

I went to Fastenal on-line, and bought all 17 O-rings for my lift cover, from them for $2.00 plus $4.19 for shipping to me. The closest Fastenal is 40+ miles away.

They list just about every o-ring there is, and what type of material you want it to be in. The same one you'll get no matter where you buy it from. No body makes their own O-rings, they all buy them from some where.

Pat

JMOR · Feb 11, 2019

(quoted from post at 08:11:31 02/11/19)

I went to Fastenal on-line, and bought all 17 O-rings for my lift cover, from them for $2.00 plus $4.19 for shipping to me. The closest Fastenal is 40+ miles away.

They list just about every o-ring there is, and what type of material you want it to be in. The same one you'll get no matter where you buy it from. No body makes their own O-rings, they all buy them from some where.

Pat

hat is all fine and good IF you know what to order. The point that posters regularly make is missed by many and that is that the unloader O-ring is not normal. Maybe shouldn't even be called O-ring. Standard O-rings are sized to fit a specific grove depth and width for sealing, whereas the unloader valve does not have those width/depth dimensions. The design is not a conventional O-ring seal design. This application is a sliding /piston ring application. If the "O-ring" used is not correct, the unloader won't move and the lift won't work. IF you know the correct "O-ring" then as you say, order it any where. If you don't know, then you will waste a lot of time and labor. If you don't know, ask HOBO, he knows.

nashranch · Feb 11, 2019

(quoted from post at 18:21:10 02/10/19) I took the lift cover off to see if I could find out why my lift acts weird while I am waiting on parts. It would not go up over 1/3 the way and sometimes playing with the draft control would allow it to raise some. I think I found the problem. I think it is called a cam follower pin. Is this correct?

I had the same problem with my 640... I just pressed the pin out and rotated it 180 degrees...should last another 50 years

nashranch · Feb 11, 2019

(quoted from post at 18:21:10 02/10/19) I took the lift cover off to see if I could find out why my lift acts weird while I am waiting on parts. It would not go up over 1/3 the way and sometimes playing with the draft control would allow it to raise some. I think I found the problem. I think it is called a cam follower pin. Is this correct?

I had the same problem with my 640... I just pressed the pin out and rotated it 180 degrees...should last another 50 years

grandpa Love · Feb 11, 2019

Cam follower pins can be bought
from Dennis Carpenter. If you
gonna knock it out , put in a new
one. Also you can order the
gasket for your top cover. I
wedged a block of wood in there to
keep things from bending then used
a pointed air chisel. Came out
easy. Adjustments can be tricky.
But shoot me an email. I have a
friend in North AL who walked me
through mine, over the phone. Also
a trick to getting the top cover
lined up when you put it back, get
some wood dowels and cut em about
10 inches long. Put one in each
corner down in the bolt hole. Sure
keeps from disturbing the o rings
and gasket. Looking forward to an
email. Thanks Kevin in Central AL

pburchett · Feb 11, 2019

I wish I could say I take good enough care of my equipment that I could say I did not clean the lift cover at all. It was dirty but not too bad. Now the rear end, trumpets and hydraulic sump had a good 1/2 inch of goo in the bottom that looked like mud.

pburchett · Feb 11, 2019

I have got to order a few more parts including the cam follower pin. I have a gasket coming and I will try the air chisel trick.
The wooden dowel tip should be a life saver. Grandpa love, your email is not showing up so I sent you a PM and my email is open. Thank you

Hobo,NC · Feb 11, 2019

I get paid to remove all the parts clean them and make sure they function as good are better than new

... So I would completely dissemble the linkage go the the press and press the old pin out and press a new'N in...

The original pin is notcher standard roll pin its a few tho smaller so if you get one that's original spec you should be able to remove it and install a new'N in without a tear-down... If not I doubt you will succeed with out a tear-down...

If you fell lucky put a pin in it and ship it... You are the one that has to warranty it not me

If it worked every time on time and the issue was as you explained pin it and move on... Its yours baby not mine...

The unloader o-ring is a -114 if you go there...

grandpa Love · Feb 12, 2019

I hate to put it out there
but........
[email protected]

640 Lift cover is off

pburchett

Member

JMOR

Well-known Member

TinCan

Member

JMOR

Well-known Member

nashranch

Well-known Member

nashranch

Well-known Member

grandpa Love

Well-known Member

pburchett

Member

pburchett

Member

Hobo,NC

Well-known Member

grandpa Love

Well-known Member

Similar threads