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Ih 1460 Valve Stack Problem

Z

Zach Scherf

Member
Ive been working on a 1460 that the swing cylinder and reel
height werent working. I followed the diagram and found that
the valve stack ( this is a all cable machine no electric over hyd)
outside the cab door wasnt suppling any pressure to the valve
body for the swing cylinder and reel height. I mean it wasnt even
allowing any fluid at all to get to the valve body. Also, there was
fluid flowing out from the inlet into the valve body. So it was
flowing backwards. I think this may be because there is no
pressure at all pushing back on it. Anyways i got the valve stack
out and tommorrow it will take a look at it. I know enough that
once i disassemble the valve stack i just have to look at the top
port plate as the book calls it. Anybody else ever get this into the
hyd? What should i look for?
 
I had the same problem on a 1480. Found a pressure relief pilot valve seat worn which dumped enough oil so the priority valve had no excess fluid to run anything but steering and header lift, nothing left over for reel lift and auger swing.

The wear is even hard to detect with a magnifying glass, but slight leakage at the pilot seat will make a huge leak at the slide valve the pilot controls. with the valve mounted on it's side, the ball hits slightly below center on the seat hole.

After hitting slightly below the hole a million times and rolling into it, it finally wears the hole slightly oval, causing that slight but killer leak.
a168452.jpg
 
Whups, my mistake. The worn pilot seat was on an 81 model electric / hydraulic model, not sure if the old 2 stick machines have the same relief valve.

I do remember repairing hydraulics on a 78 model 2 stick 1480 that had low pressure and severe oil heating. That one had a leaking O ring on a fixed pressure relief valve cartridge.
 
Thanks sir I'm going to take the valve stack apart this evening and see what is going on in that port plate. Exactly how does the flow divider work? How does it decide the flow to reel and swing cylinder? I know it gives priority to the steering
 
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