"bob" wrote:

That is a nice pressure drop you have there now. 25PSI on 375 about 8 or 9 % cold.
Later Bob

Your saying nice as in not too much?

I have found on most Cat Fixed displacement hyd systems. Hyd's or powershift trans main pressure you have a 10% pressure drop between full throttle and low throttle. This is because the relief valve spring extends to close the valve under the reduced flow at low throttle. Approximatly 1/3 engine speed and 1/3 pump flow at low throttle. 700 RPM as opposed to 2100 RPM. With a pump in good condition. You have less than that so if the splines in the drive gear are not worn and going to dammage the pump you have it fixed.
Later Bob

I can't believe it but I had put the bad new pump in a remote drop box for the Cat dealer to pick up, and I went back over to the box early this A.M. and it was still there. I pulled it apart and there was absolutely now signs of wear. However, I did fire the machine up today, and I believe I still have a leak. I watched the guage and it did the needle sputter deal several times. I didn't run it that long, and it may have just been some air in the system from setting. The needle definately has a very highspeed short flutter, and I am wondering if that is just the way it normally would look.The large lock nut (like 2 plus inches)that secures the top suction hose was what was loose and I was wondering if that has some kind of 0-ring to seal that joint or something.I do have a manual on it's way, but have yet to find a parts book.Back to the splines, I stuck the shaft out of the pump into the gear, and moved it back and forth applying pressue to all the sides and such, in an effort to illicit an edge or wear area, and really couldn't feel "almost nothing" ,just a little bit, barely discernable,no ledge of any sort. Do you think I should still swap the gear? I'm afraid I'll take it apart, and it will already be swapped.LOL

If the old new pump wasn't marked the gear will be okay. I don't think many people know about turning the gear over. If the suction line had a big nut on the end it likely is a JIC fitting. The fitting the line goes on might be dammaged on it's sealing taper. You can get copper washers from Cat Dealer that fit the taper and seal it up. They are listed in their hose book. Find the exact wrench size that fits and they can match the JIC size # to a line cap the same size.
Later Bob

Thanks, I believe it to be a JIC fitting, I just couldn't remember what it was called. Thanks again for all of your help!

Hi Team,
repair seals/gaskets for recovery of JIC fitting tapered sealing faces as described by Bob. Great invention to save damaged fittings at minimal cost.
Cheers,
Eddie B.

EDB thanks! After looking at the cross section of the fitting,I'm not so sure that my fitting is a JIC. If I remember correctly, it just has male threads that screw into a piece of plate on the side of the magnetic screen. A jam nut runs up againdt the plate. I'm going to check it out again today.

If the fitting has an angle, it needs a jam nut to lock it at desired orientation. It will have an Oring under it too that will be hard from all the heat. Take out fitting and take to dealer with you to get everything.
Later Bob

Yes the fitting is the angle with the jam nut, and I think the o-ring isn't even there. Not for sure yet because I haven't got it off yet. Is the guage fluctuation of about 5-10 lbs normal, or is that just a sign of a small suction leak? Its a fluid filled guage. Thanks

A liquid filled gauge is of good quality and should hold steady not have needle vibration.
Later Bob