Gleaner L2 hydraulic pump needed

We switched to using an 8 row corn head on our late L2, and now it doesnt want to lift the header after the machine gets warmed up.  We replaced filters, screens, etc, dont have any leaks in the rams, so that means pump, right?  Abilene machine wants just over $1000 and cant get them for 2 months, our AGCO dealer priced them over $2000, and thats just a little hard to swallow.  Am I correct in assuming that the pump is weak, or am I missing something simpler?  Everything else works like it is supposed to, and we have never had any trouble with a grain header or a 6 row (black) corn head, so we just assumed it was the extra weight.  If anyone has any ideas, or a source for a new one or parts to rebuild one, we would really appreciate it.  Thanks!

I know that pump is different from my F2 but can't you buy a O/H kit from AGCO and rebuild it?New wear plates and backup seals made a huge difference on my F2.Dr Allis has a valid point too

I checked and our L2 does have the 3 inch cylinders, they were rebuilt not long ago and dont leak.  I looked in the online parts book, and they show a "pump kit" which is the $2000 plus item that they would have to order.  Since Abilene is back-ordered, I suspicion that I wouldnt be able to get the Agco one if I wanted it.  I have asked everywhere I have called if there is a rebuilt kit for the pump, and no one acts like there is.  If anyone could point me in the direction of one, I would be glad to try.

Force= Area*Pressure

To put it simply, if you need to move more mass you will need to add more affected area(larger bore cylinders or an additional cylinder or increase your system pressure).
I had to add the third lift cylinder on a(I hate to say the word MF 750) for a 6 row cornhead years ago.
Don't spend the money on a new pump or any kit until a qualified tech checks out your unit. The fluid will take the path of least resistance-
is it easier to raise your conrhead or go over a relief valve?

Hope this helps,
Tom

Thank you all so much for your replies and phone calls with ideas.  To answer Jim's questions, it is a late L2 witht he long shoe, 30.5x32s, RWA, 670 engine, etc, at one time it was a custom machine and has twin fuel tanks, so we thought it ought to handle the load.  We run Dextron, and when we started having this problem I added a few quarts of Lucas Trans-Tune/stop slip to see if that would help (it didnt).  We have gone through the valve bank, checked connections and hot-wired to double check, switch solenoids around, etc, didnt help either.  At Clay's suggestion, I did try Mike's and they had used but not new or reman. I called Cook's, same story.  Slade had checked on SSB Tractor, and when I called them they were out of stock.  We do have some spare 3" lift cylinders, so we will try to fabricate a mount or two and try that out in the morning. 

Always check pressures before assuming its the pump. A $10 gauge will tell you alot.

How's the corn turning out?

Tom

Glad that I could help. 100 bu./acre, that was my target for corn back in the late 70s-early 80s. As you mentioned some years were better than others.

Tom