Ford 640 lift arms in rear won't go down or up.

I was told if you air up the hydraulic system the arms will begin working again..

Where do you air up the system? In the dip stick hole?
How much pressure should be applied to try this event?

This tractor has a PTO pump in the front down by the radiator running off the front crankshaft which runs the bucket loader.

I don't see any other hydraulic pump on the tractor so I'm assuming I air up the system via the dip stick tube hole.

Anyone run into this before? and did airing it up work?

Next, I understand there's a valve with O rings under the hydraulic system top cover. What goes wroing with these valves? O rings rip? whole valve goes bad or? Like should I be buying a new valve or O ring set and just replace all of them?

Thanks in advance for any info you might have.
 
If your tractor has 3 point it has an onboard
pump. It is located on the right rear corner of
the engine. It is run off the camshaft. There
is an allen head plug on the top/side of the
pump. Srart the engine and run it at slow idle
then crack the plug and let it spit untill the
air stops spitting out and you get clear oil
coming out then tighten the plug back up.
Do you have a manual for your tractor?
You need one.
 
Thanks for getting back to me..

Yes, I purchased the manual...looking into it now.

I don't have that pump on the right rear side of the motor.. it looks like just the governor is located there.
Don't see any other hydraulic pumps other then the one upfront for the bucket loader.

I saw a video on youtube about the allen screw bleeding you referred to but nope.. don't have the pump there and no allen screw less I'm blind or something.. Ha

 
Governor is at the front of the engine. Hydraulic pump is at the right rear of the engine, as previously said. Left and right refer
to as you are sitting in the operator's seat. If it has a 3-point, it has to have the pump.
 
This is NAA, but pump almost like yours (bleeder hose attached)
zR0USJY.jpg
 
(quoted from post at 11:14:07 01/29/18) If your tractor has 3 point it has an onboard
pump. It is located on the right rear corner of
the engine. It is run off the camshaft. There
is an allen head plug on the top/side of the
pump. Srart the engine and run it at slow idle
then crack the plug and let it spit untill the
air stops spitting out and you get clear oil
coming out then tighten the plug back up.
Do you have a manual for your tractor?
You need one.

Ok.. I got the manual out.
I have Vane style pump..
The unit I thought was the governor is the Vane style pump with flow control valve on it.
I read up on checking for prime and found the allen plug on the lower right side of the hydraulic housing almost behind the step that you rest your right foot on.

but before I mess with that it says to pull the flow control valve out and check to make sure it's sliding nicely inside the pump in and out.. It may have a burr on the chamber walls causing it to not move which could stop fluid flow.

If the flow control valve is good I'll go to step 2.
Step 2:
It says to remove the allen plug on the right side of the hydraulic chamber down near your foot / put the lever in the up or down position (don't remember right now which way up or down) but to see if fluid comes out of the hole with the engine running. If no fluid comes out of the little hole the pump lost it's prime.
If that happened which I'll check.. it says to just air up the chamber thru the dip stick hole and see if begins working again.

So once I check this all out I'll come back in and let everyone know my outcome.

Thanks a million for the help.
The pump posted in the pictures is not my pump style. but thanks for posting that picture Sir.
 
lOOK AT THE PUMP THAT IS HOOKED TO THE FRONT OF THE MOTOR. THATS THE BEST WAY TO PUT A LOADER ON AN 8N SO YOU WILL HAVE LIVE HYDRAULCS TO IT WHEN EVER THE MOTOR IS RUNNING. TRACE THE LARGEST LINE GOING TO THE PUMP AND SEE IF IT GOES TO THE LOADER FRAME. . THAT WILL BE THE SUCTION LINE. I SUSPECT IT GOES TO THE LOADER FRAME. SOUNDS LIKE YOU MIGHT HAVE AN 8N FORD AND IF SO THE HYDRAULICS 3PT WONT WORK UNLESS THE PTO IS ENGAGED. THE PHOTO JMOR IS SHOWING YOU IS ON I THINK ON ALL NAA FORDS UP TO THE 900 SERIES. I HAVE AN NAA AND A 960. BOTH HAS SAME PUMP SET UP. I HAVE NEVER HEARD OF FORD PUTTING AN OIL PUMP ON THE FRONT COURSE I AM NO EXPERT BY ANY MEANS.
 



Have you read all the previous replies to this thread? Sorry, but I think you're totally out in left field on this one. Besides which . . . turn the danged CAPOS LOCK off, please!
 
I moved the piston type pump to a replacement motor
and found the allen wrench bleeder plug stripped.
Was told about the air priming. It worked.
steps:
1. fill reservoir with fluid.
2. run tractor at idle.
3. place lift lever full up.
4. air gun to dipstick opening.
5. I tried air up to 60PSI but lower may work.
6. lift arms should slowly raise.
I had to repeat several times a day for a
few days. eventually the lift started working
at step #3.
Now unloaded lift at idle raises in 6 seconds.
 
(quoted from post at 06:06:33 02/03/18) I moved the piston type pump to a replacement motor
and found the allen wrench bleeder plug stripped.
Was told about the air priming. It worked.
steps:
1. fill reservoir with fluid.
2. run tractor at idle.
3. place lift lever full up.
4. air gun to dipstick opening.
5. I tried air up to 60PSI but lower may work.
6. lift arms should slowly raise.
I had to repeat several times a day for a
few days. eventually the lift started working
at step #3.
Now unloaded lift at idle raises in 6 seconds.

Thanks for your feedback Corvettt

I haven't messed with it yet.. been too cold here lately.
My lift arms are all the way up right now so when I air it up, not sure what to expect but we'll see when that day comes if something moves or not.

Probably wait till the temps get in the 50's then go into attack mode and air it up.

I'll post my findings here when I'm done checking it out.

Thanks again for your input.
 
if they are fully up right now
you have to fix that first.


It probably has no priming problem.
Not sure of the steps necessary to
do that without pulling the lid.
I would try some additional 3 point
weight as a first step.
 

yup, for sure..
I'll do all that stuff when it warms up here.
Just too cold to mess with the thing right now.

I've got it in a nice new garage I just built but still just wrong timing right now with the cold.
 
Tell me about it. I am in the northern
most Poconos and I have a 641 hydraulic
lid on a motor puller waiting to lower it onto
the 821 tractor. Even with a torpedo heater
a few feet away I can't get warm enough
to permitex and O rings and lower it down.
I hope I don't have to wait till the spring.
10079.jpg
 
(quoted from post at 14:16:58 02/03/18) Tell me about it. I am in the northern
most Poconos and I have a 641 hydraulic
lid on a motor puller waiting to lower it onto
the 821 tractor. Even with a torpedo heater
a few feet away I can't get warm enough
to permitex and O rings and lower it down.
I hope I don't have to wait till the spring.
10079.jpg

Poconos..
East end of Pa right? Bartonsville area?
I use to drive big truck out that way to Chicago for delivery every monday morning.
It's a little nuts up in the mountains there and down on the west end of PA exit 22 thru 24 I believe.
 

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