Ford 600 hydraulic adjustment

jmbennett · Apr 29, 2015

I recently purchased a ford 640. the previous owner had adjusted the 3 point hitch to only raise high enough to get his finish mower off the ground (about 6 inches). i'm trying to figure out how to get it back to the point that it will engage the lift to the full range of height. the control lever has full range motion, so i'm assuming it is something internal. any and all info would be appreciated!

thanks!

JMOR · Apr 29, 2015

(quoted from post at 15:37:53 04/29/15) I recently purchased a ford 640. the previous owner had adjusted the 3 point hitch to only raise high enough to get his finish mower off the ground (about 6 inches). i'm trying to figure out how to get it back to the point that it will engage the lift to the full range of height. the control lever has full range motion, so i'm assuming it is something internal. any and all info would be appreciated!

thanks!

o full lift in EITHER Draft mode or Position mode?

jmbennett · Apr 29, 2015

correct. lever slides full range, only lifts a little on both draft and position settings... starts raising 3/4 way up on the lever and stopping when fully engaged.

the guy that sold it to me was selling it for a friend, but said that it was set that way on purpose.

sadly no way of contacting him.

JMOR · Apr 29, 2015

Will it lift a real load or are we talking about just raising the arms/links? If it will lift a real load, will it hold it up when you stop the engine?

jmbennett · Apr 29, 2015

yes, it does lift the 62inch mower and I've had a few hundred pounds on the boom pole. keeps it right where it is when shut off.

fairly certain it isn't a leak or a problem with the hydraulics, just some sort of adjustment that regulates the range of motion in the lifting.

JMOR · Apr 29, 2015

I can see range being set to some limit in Position control, but for Draft control, it is kind of "digital", i.e., control valve is either in LIFT or LOWER. In Draft control, there is no indication (feedback) to the linkage/control valve to tell it "position" (amount of lift), so I do not see how your observed behavior is occurring. Not to say that it isn't, just makes no sense.

jmbennett · Apr 29, 2015

OK. i'll try to go through every scenario again tonight, to be sure. thanks for the attention/feedback!

Sean in PA · Apr 30, 2015

The only way that I can think of to get those results would be to shorten the cylinder rod so that it's only pushing the upper arms that much when the piston is fully extended.

jmbennett · Apr 30, 2015

Ok, I was able to run through the scenarios again last night.
When in draft control the arms will fully lift (had a little help pushing on the top link spring, as wasn't big enough by myself).

JMOR · Apr 30, 2015

(quoted from post at 11:02:30 04/30/15) Ok, I was able to run through the scenarios again last night.
When in draft control the arms will fully lift (had a little help pushing on the top link spring, as wasn't big enough by myself).

k, that pretty much nails it down to internal linkage adjustments, for which top cover must come off.

Keith Williams · Apr 30, 2015

I bet we're all thinking "CAM FOLLOWER PIN"
at this point.
Take the cover off and you will see.
Keith

jmbennett · Apr 30, 2015

Thanks.

This will be the first time diving into anything internal... any springs that I will need to watch for, or is everything self contained?

Also, any advice/tips on how to take it off, or things I need to be careful with??

I have a shop manual now, but it really doesn't get in depth (probably because most have some idea of what's going on).

jmbennett · Apr 30, 2015

And am I correct in assuming I will need to order a new gasket/kit to reassemble once it is removed??

showcrop · May 3, 2015

(quoted from post at 11:33:17 04/30/15) Thanks.

This will be the first time diving into anything internal... any springs that I will need to watch for, or is everything self contained?

Also, any advice/tips on how to take it off, or things I need to be careful with??

I have a shop manual now, but it really doesn't get in depth (probably because most have some idea of what's going on).

Be sure that the 3 point is all the way down before you lift the cover. Also the cover with all it's parts underneath is pretty heavy, probably seventy lbs. or so, so between the wight and getting the gasket to release it will take a good pull.

jmbennett · May 7, 2015

Ok. thanks to all for the information and help.

I was able to speak to a New Holland dealer last night, and he said there is a "position control spring" that needs to be adjusted. I just have to take the top cover off and bring in the assembly. Special tools needed to make that adjustment.

I'll try to get the cover removed this evening.

Thanks again for all the help!!

showcrop · May 7, 2015

Mr. Bennett, glad your dealer can help. I hope that his techs can work on an old one. Remember that in the future the techs here at YT who have made this repair literally thousands of times are ready and willing to walk you through it so that you can rely upon yourself.

Ford 600 hydraulic adjustment

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