I picked up a two valve 41 hydraulic unit for my 5UD2 today. My concern is that it will no longer have enough oil capacity to operate my scraper. 1. Can I plumb a surge tank like the D4 setup for the 40 scraper to the 41 unit? 2. If I do this should I plumb the line with a high pressure hose or should I hook it up with pipe? 3. Is the crankshaft coupling the same for a pre 13237 serial number engine as the later model engine? 4. Does anybody have the dimensions for a cylinder that would work for the tilt on a tool bar dozer?
Thanks
Chuck C

Hi Chuck C,
That's quite a list of questions.....can answer most/not all.
First, are you sure you want to use the #41 for that application? It only puts out 13 -14 gpm and 750 psi at full load governed speed.

No reason you can't add a surge tank. Pressure is low, piping on the D4 is steel with a hose clamped connector. They are primarily an air cushion/surge tank, not intended to be a reservoir.....installed to allow full liquid capacity of the #44 pump tank.

As far as the pulley coupling flange, based on the #44 installation for both early and late "U" models they are the same.

Can't say for sure on the tool bar dozer tilt cylinder.

I don't have my notes with me right now, but I have a tilt cylinder with a 4.5" stroke, 4" bore cylinder on a toolbar setup I believe it gives me 7 - 8" raise and 7 - 8" drop on the corner from level.

I had to take a cylinder and machine it down, then I used spherical bearing ends for where it attaches to the blade. You have to check your blade and see how much articulation you have in your joints before you go hog wild with too much tilt.

Lets try to move my pics withput uploading them again, I posted the #41 info before. The front mount unit puts out 15GPM @ 1000 psi

The #41 front mount is listed in it's book as a pump for the #4 toolbar, In fact I have used one on a #64 toolbar. As for running the scraper, you might run into slow operation as they were recomended to run on the #44 pump if I remember correctly.


Here is the thread with the pics if it doesn't work
www.acmoc.org/ACMOC_BB/showthread.php?t=3363


There are actually two completly different styles of #41's The fact that you have two valves leads me to believe you have the front mount style.
Front mount
www.acmoc.org/ACMOC_BB/attachment.php?at...id=5151&d=1208557695

Rear mount
www.acmoc.org/ACMOC_BB/attachment.php?at...id=5150&d=1208557695

The specs I have are not that generous under full load conditions and recommended operating pressures.

Thanks. I have a LaPlant-Choate C-45 scraper that my single valve 41 unit operates the scraper. The unit has to be full to the top or the tank runs low on oil. I want to make sure that the pump has enough oil so i don't have any trouble. Cr, how long is your cylinder,center of pin to center of pin, when it is fully retracted?
Thanks Chuck C

Chuck I don't have the measurement with me right now, when I get back from work I will go out and get the measurement for you. The tilt cylinders require a long cylinder with a short stroke. If you look at some of the modern blades the cylinder has a long base before it connects to the push arm.

I didn't realise you had a Laplant-Choate scraper, I was thinking you had a Cat #40 for some reason. How does that thing operate with only one circuit. Most scrapers that I have have used either used the lower links of the three point hitch and one valve on the small soilmover scrapers, or two or even three valves on the bigger pull scrapers.

Oil overflow seems to be a big problem with our front mounted #41's we had on the ranch, but we also put in later pump cartrages to run higher pressures.


Here are some pictures that I have saved from this site...not mine.

Here are some more. I believe the D2 picture is of Tractor Don's

Chuck
For whats its worth on mine the tilt cylinder is the same as the lift cylinders on my toolbar

They are slow to react when grading, or mabe thats a operator problem

Thanks Steve
Chuck C