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Hydraulic Lift Cover Adjustment

J

Jaypat88

Member
I am currently replacing the hydraulic lift cylinder, and lift shaft bushings in my MF40 Industrial Hydraulic Lift Cover. I have the service manual, and I am reading over the lift cover adjustments. I do not have the special tools, and I was curious if it is possible to perform the lift cover adjustments without the special tools and how complicated the job is? Am I better off taking the lift cover to a local tractor repair shop?

Thank you!
 
Hello, If you guess the stop adjustments incorrectly you run the risk of breaking the new cylinder or cover. If you have someone nearby with the tools it would be worth letting them set it up. It might be possible to follow a manual and guess/estimate the settings but you would need to be thoroughly conversant with the system first.

DavidP, South Wales
 
I second what DavidP said!

You don't want this to happen.
45956.jpg
 
Yes and no..... The relief valve is there to blow off when you try to lift a load greater than the system is
set/designed to do. When set correctly the ram arm on the main hydraulic cross shaft will stop moving before it
allowed to butt up against the casing. Say for instance that you remove the maximum height stop on the Position
lever quadrant. This will allow the ram arm to make contact with the casing and the result can be a broken cover or
cylinder. For this example it is ABSOLUTELY ESSENTIAL that the 3 point linkage is not allowed to lock up. When
raised to full adjusted operating height against the stop on the quadrant you should be able to lift BY HAND ONLY
the 3-point a further one to one and a half inches to its maximum free height.
This damage can occur more easily on earlier tractors which had the thinner lift cover.

DavidP
 
(quoted from post at 11:05:56 02/23/17) Yes and no..... The relief valve is there to blow off when you try to lift a load greater than the system is
set/designed to do. When set correctly the ram arm on the main hydraulic cross shaft will stop moving before it
allowed to butt up against the casing. Say for instance that you remove the maximum height stop on the Position
lever quadrant. This will allow the ram arm to make contact with the casing and the result can be a broken cover or
cylinder. [color=red:95677048cd][b:95677048cd]For this example it is ABSOLUTELY ESSENTIAL that the 3 point linkage is not allowed to lock up. When
raised to full adjusted operating height against the stop on the quadrant you should be able to lift BY HAND ONLY
the 3-point a further one to one and a half inches to its maximum free height.[/b:95677048cd][/color:95677048cd]

Good stuff to know, thank you.
This damage can occur more easily on earlier tractors which had the thinner lift cover.

DavidP
Click to expand...
 

A few months ago, I removed the top cover on my 8N to do some repair work on it. I noticed that on the long control arm that actuated the control valve, it had a dowel pin that was lined up with the side of the cylinder end. I was told that it was there to prevent over travel of the piston. If the piston came out too far, it's skirt would hit that dowel pin and it would push the control arm back so it would back off on the control valve.

So is what you're telling that there is no such safety on the MF's to prevent piston over travel?
 
If everything is adjusted correctly there is no need for such a pin. The linkage will not allow such an over travel if its properly set. Mechanical failure is a whole different animal however..
 
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