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Macdon swather hydraulics

S

SVcummins

Well-known Member
Can somebody please tell me why they would route the hydraulic circuit like this
a167998.jpg
 
That doesn't make any sense!

Wish I could see the rest of the schematic.

How would oil ever get to circuit 6?

Unless those are single acting cylinders, tied together just to keep dirt out. Still a strange way to do it...

Is it really plumbed that way, or is this a misprint?
 
Well for two reasons. 1) It makes the header lift evenly. 2) It takes half the amount of oil to lift the header.

This type of hydraulic plumbing is very common on farm equipment with multiple lift cylinders. When the oil goes to #5 the return oil from it feeds #6 making both cylinder extend but only requiring the system to provide the oil for extending #5. In the extend direction #5 is the master and #6 is the slave cylinder.

Usually systems like this have a valve built into each cylinder that allows them to bleed through when they are completely up. This way they re-phase every time they lift.
 
The two cylinders work in opposition. one pushes the other retracts under control. When lowering the opposite happens. Jim
 
Also the #5 cylinder would be a larger bore than the #6 cylinder. So the return oil out of #5 would have the required volume to make #6 lift the same distance.

Example IF #5 is a 3.5 inch cylinder the rod side would have about the same volume as #6 would have on the non rod side if it was a 3 inch cylinder.
 
JD has it right. Series circuit so the cylinders extend and retract at the same rate. Those probably rephrase when retracted. Need a model number to tell you for sure.
 
For lifting and lowering both ends of the platform at the same time. Otherwise one end would come up first (lighter end) and the heavy end would lower first. There is a rephasing port(s) in the double acting cylinder.
 
The header won't lift at all right now the mechanic before me blew up the hydraulic pump trying to test pressure on the system. I walked into this deal and I'm trying to figure out how to fix it replaced the hydraulic pump I'm getting plenty of oil but it won't work . I's there a port that lets the opposite side of the cylinder fill with oil or do I need to prime the cylinders ? The head tries to raise but it acts like its fighting itself and I can see why it could be with the hoses routed the way the are . Looks like a ok system if everything works right
 
The left side cylinder needs to reach the end of its stroke to rephase with the right side cylinder. It can rephase either extended or retracted. Just making a guess, but i would check the relief pressure first. If it has the hose for reel lift, you can couple a guage to it and read the pressure while activating the reel valve. Keep in mind that valve S1 needs to close for the system to build pressure.

Ideally to bleed the air out of the cylinders, you would start with the header off. Then the left side would lift first, and once it hit the top, the right side would lift.
 
Thank you I'm going to disconnect the cylinders from the header frame and see if they will move with no load on them the real goes up and down fast but I have not tried putting a gauge on anything yet . I'm going to call the macdon dealer and see if I can buy a copy of the service manual for the machine I have an operators manual for it which has a lot of info actually but I'd like to have a service
 
From your pic of the manual I am assuming it is a 92/9300. The tech manual is out of print, but if you send me your email address I can give you a link to download the tech manual.

If the reel raises, we know that S1 is functioning, and the relief is probably alright. Most headers take more pressure to raise the reel than lift the header.

S4 needs to be powered and the oil needs to ba able to push S5 open for the oil to make it to the cylinders. Where you say the header seems to be fighting itself, I would check S4 first. If it is not shifting, the header would be trying to go down on the right cylinder, but is locked by the return.
9000 parts catalog
 
How can I test these spool valves to see if they're operating I pulled two of them out the one I suspect to be the problem and the solenoid that controls them when I hook the solenoid to power it magnetizes but when I stick the valve in the solenoid the spool inside the valve doesn't move ?
 
That's common. Both our CaseIH mower conditioner and the Gehl discbine are plumbed this way.

Pressure from the tractor extends one cylinder, which pushes oil out the top of that cylinder into the bottom of the other cylinder. Both cylinders extend evenly.
 

I know I am bringing up an old thread, but curious if you still have that link to the service/tech manual you have for the 9000 series swathers? Been doing some work on my unit and have found I could use a little guidance on some tolerance specs doing some fixing on the planetary drives. If you still can find it, can you please contact me at [email protected]. It would be well appreciated. Thanks
 
(quoted from post at 10:41:52 05/10/22) I dunno about the hydraulics but I am seriously tickled to see JD Seller here again.
Click to expand...

Look again. JD Seller's post was in August of 2017. This is an old thread Brma tagged on to.
 
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