Cross Hydraulic Pump - Seals available?

[devozoo]

I have a hydraulic pump on the front of my Jublilee that circulates fluid but won't build pressure. I've taken the pump off and torn it apart. It is a Cross. It has two numbers on it. On the end where it is stamped "Cross", it has the number 5Z420. On the other end of the pump, it has the number 5Z4001.

I'm wondering if I can get a new set of seals for this pump. If anyone knows if they are available please let me know. I think it would be worth trying a new set before buying a new pump.

If it's not the seals, can you recommend a new pump? Correct model, size, where to purchase...
There are pictures of the Cross pump and the rest of the setup in an earlier thread that can be seen here:

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=ford&th=409962

Thanks for the help!

Matt

 

[RickB]

If it's not puking oil out on the ground, a seal kit won't help you unless you want to reassemble it and do some flow and pressure testing to find out what is really going on there.

 

[devozoo]

Well, for what it's worth, I noticed when I took it apart that both of the shafts inside the pump, that have a sleeve with fins on them each had metal shavings wrapped around them from wearing against the aluminum pieces inside the pump. I don't know if that has anything to do with my issues or not. The pump all in all looks fairly simple inside.

Do you have any suggestions on where to start? Or should I just buy a new one?

 

[RickB]

You are describing a gear pump. The gears have to seal against the housing bores efficiently for the pump to make rated flow & pressure. If the housing has grooves worn in it as from the metal you found at the edges of the gears, the pump is junk. Google Cross Hydraulic pump; places like Surplus Center, Bailey, and Baum hydraulics should come up. One or more of these suppliers should be able to match your pump closely.

 

[john_Bud]

Yep, if the aluminum housing is scored the pump is a door stop. Surplus center is a good source.

I am trying to think, but nothing is happening, it should be Counter Clock Wise rotation, right?

jb

 

[devozoo]

I don't know if I need CW or CCW...how would I figure that out? I would assume it would be the same for any Jubilee, right? Also, when I look at the pumps on different web sites, it looks like my choices have to do with the diameter of the shaft (I can figure that one out), size, and the gpm. They all look like they are 3000 psi rated, but how many gpm do I need and which size for a Jubilee? For example, the Cross Series 40 says:

SAE "A" 2-bolt mount. Rated to 17.5 gpm.
6 sizes: .5, .75, 1.00, 1.25, 1.50 and 1.80 in3/rev.

I could really use some help on this one. I'm in the deep end of the pool and just want to get my front blade working for all this Michigan snow!!!

 

[devozoo]

I don't know if I need CW or CCW...how would I figure that out? I would assume it would be the same for any Jubilee, right? Also, when I look at the pumps on different web sites, it looks like my choices have to do with the diameter of the shaft (I can figure that one out), size, and the gpm. They all look like they are 3000 psi rated, but how many gpm do I need and which size for a Jubilee? For example, the Cross Series 40 says:
SAE "A" 2-bolt mount. Rated to 17.5 gpm.
6 sizes: .5, .75, 1.00, 1.25, 1.50 and 1.80 in3/rev.

I could really use some help on this one. I'm in the deep end of the pool and just want to get my front blade working for all this Michigan snow!!!

 

[devozoo]

This seems to be about right for me:

http://www.surpluscenter.com/item.asp?UID=2008011919425164&item=9-7073-100&catname=hydraulic

I'd appreciate it if you could take a quick look. It's 8.8 gpm at 1800 RPM. It's also reversible in direction (still wondering if CW or CCW is right). Thanks for the help guys. Could one of you give me the nod on this one?

 

[john_Bud]

I think you need to be about 13 gpm at 1800 rpm. The 8.8 will work, but will be slow.

Here's how i figure out the rotation. Go out to the tractor and determine the direction it is rotating. Then determine the direction the shaft on the pump is rotating when facing the pump. It should be the opposite of the tractor.

On your current pump, measure the size of the fittings. You ideally want to match that on the replacement. If not, you need to buy adaptors or get new hozes.