Loader refurbishing worse than when I starte

[woolyAcres]

Unfortunately the 5Z420 means nothing, it is a casting number and not a valid model number. Also could not find any info on where a model code could be.

I also could not find any dimensional information to see if the different displacements had a different overall length. I suspect they do but not sure. The 0.5 cubic inch would provide around 2 GPM at 1000 RPM and 4 GPM @ 2000 RPM. This would be a reasonable match to a 4 gallon reservoir.

I know very little about pumps, but physically this seems larger than 2GPM. I'll hunt around more on the shell to see if I can find any model numbers. But based on the condition of the shaft (pretty rusted) and the fact that I could be guessing about the model, I'm not sure repairing this is worth it. Besides I'm not sure the 2GPM pump offers much in the way of improvements over what I had.

I figure I've got two options.
1. plumb the new valve into the main tractor/3PT hydraulics, just like it was when I started.
2. buy a new pump like this one, and keep fighting with this.

Where is this return line port in relation to the pump inlet port on the reservoir? Directly below it, opposite corners, etc.

Suction is bottom left (when looking down at tank from above); return is upper right so opposite corners.

Is the a baffle in your reservoir?

No

Like LD1 stated, if the return is above oil level it will aerate the oil especially in this small of a volume.

Return line enters at the top of the tank then goes through a 90* elbow eventually coming out about 4-5" below the top of the fluid.

This link is for the service manual on this pump. It also provides some model codes.

Gear Pumps and Motors Technical/Service Manual - Cross Mfg.

Thanks. These will come in handy if I decide to rebuild this pump.

Note: This also states the inlet hose should be 3/4 inch or larger.[/QUOTE]

 

[woolyAcres]

That "return line" he is talking about that gies 4" inti the fluid is the fluid coming BACK to the tank, not being sucked TO the pump. See previous picture of the pipe where the fluid leaves the tank, it is way down at the bottom.

Yes, that's correct.

 

[woolyAcres]

That pump says it is rated to 17.5 GPM. Joystick valve is rated at 10 GPM. Not what you want.

Try leaving the tractor at low low idle as asked above, if that is not what you already did, and see if there is foam.

I admittedly know very little about hydraulics, and pumps, but based on the size of this pump compared to the rear 3pt hitch power pack that was on here when I bought it, I'd say this is every bit as large. That one is something like 20GPM. The thing that doesn't fit with the pump being so large is the relatively small reservoir.

I agree that a pump that size with my new valve is NOT a winning combination.

 

[woolyAcres]

Here are some photos of the pump after removal.

 

[TomSeller]

If you select the highest cu in per rev at 2200 RPM you get
(2200 rev/min) x (1.8 cu-in/rev) / (231cu-in/gal) = 17.1 GPM

If you select the lowest cu in per rev:
(2200 rev/min) x (0.5 cu-in/rev) / (231cu-in/gal) = 4.7 GPM

See if you can find a cu-in per rev indication.

 

[GPintheMitten]

I wonder if you gave a call to Cross in the morning if they would be able to help.

 

[oldnslo]

Looking at the pump pictures and presuming the pipe fittings are the inlet port this is a CCW rotation pump viewed facing the drive shaft.

 

[Coyote machine]

Pump And Motor Identification
CROSS pumps and motors are stamped with identifying six digit stock numbers on the lip of the flange as shown in the diagrams below.

If stamped numbers on the flange are difficult to read, displacement may be determined by measuring the body or gear width as noted.
40 series units begin with 36
50 series units begin with 30
60 series units begin with 33
50T units begin with 32
50G units begin with 31
MODEL # Gear
Width Body
Width
40P005 .372 .779
40P007 .558 .965
40P010 .744 1.151
40P012 .930 1.337
40P015 1.116 1.523
60P081 2.045 2.548
40P018 1.339 1.746
50P015 .675 1.082
50P019 .867 1.274
50P023 1.031 1.438
50P027 1.218 1.625
50P033 1.467 1.874
50P038 1.689 2.096
50P052 2.311 2.718
60P040 1.015 1.518
60P051 1.280 1.783
60P061 1.545 2.048
60P071 1.795 2.298

Link with diagram:Product ID - Cross Mfg.
Refer to bottom half of the page, where the diagram is shown...

The post #84, I believe, where LD1 showed the Cross pump page, states the 40 series pumps are rated to 17.5GPM, which could mean some of the series pump that amount, and others don't.

Regardless, have you removed the 10 micron filter and tried running the pump system to see if it still foams?

Also, the technical specs for the 40 series pumps specify what viscosity fluids must be used, and NO synthetics.
See small print on this page:40 Series Pumps and Motors - Cross Mfg.

Premium quality anti-wear type oil with a viscosity between 100 and 200 SSU at operating temperatures is recommended. Do not use synthetic fluids.

So, it would seem the current pump may be too much flow for your 10.xxGPM valve assembly, which could cause the shuddering/squealing, etc. by trying to push too much liquid through the valve. I doubt the tank and pump are incorrectly sized, because something is rated to so many GPMs doesn't mean it has to have a tank the size of the max pump GPMs capacity. It does mean that the tank needs to hold enough fluid to be able to fill all cylinders, etc. and not drain the tank or suck air when the pump is running.
I would definitely give Cross a call and see if there is a way to make the pump/tank work with the valve you have. I suspect they will say no, at which point, if you are set on doing this refurb, your best case solution is probably to get a correctly sized GPM pump to fit your application and specifically your FEL valve. You would want to size the new pump orifices to the hoses you have UNLESS the pump specs other sizes required. :confused3::thumbsup:

 

[Leejohn]

I still think the intake is just chocked down to much and my guess the pump is the 07 pump. If it is then the pump is ok. I have a cross on my log splitter and the intake hose is 1" and pressure is 3/4". The pump is about the same size as yours.If your valve has 1/2" intake then chock it down there not at the pump. Here is a couple pictures.
BTY I am turning my pump CW, that is why the intake is on that side.

 

[woolyAcres]

Looking at the pump pictures and presuming the pipe fittings are the inlet port this is a CCW rotation pump viewed facing the drive shaft.

If this is true than I had the in/out setup correctly regarding the tank and valve.