Pump question

[ParkerFly]

I have a 12 gpm hydraulic pump out of a combine that has two pressure ports on it. One flows 8 gpm out of it to supply the hydrostat and the other port flows 4 gpm to supply the rest of the machine. It's not going to be used in a combine anymore and I'm wondering if the small port could be capped, would all 12 gpm go out of the large port? I need a 12 gpm pump and this one was free, but I need all the flow out of one port. Can anyone help? Thanks,

Justin

 

[Egon]

The pump produces 12 gpm so it may be ok as long as the 8 gpm line size will handle the extra 4gpm.

 

[ParkerFly]

That's what I was thinking too but wanted to make sure. The pump has 1/2" lines on it now which from what I understand will flow up to around 15-16 gpm safely.
Another question about this pump, is it safe at all to go to a smaller pulley and slightly overdrive it? I only thought of this because it has a massive pulley on it now. I wouldn't want more than 15-16 gpm because I can't afford to replace the miles of hydraulic line with larger ones. Thanks again,

Justin

 

[ThomasH]

As long as it is a simplex pump, that is one with only one physical pump section in the case, it will work fine by capping a port. So, have you taken the cover off the pump and looked? Does the pump have stacked sections like a typical duplex or triplex pump?

Tom

 

[AKKAMAAN]

this is most likely a double pump, two pumps in one housing...capping one outlet will make you VERY UNHAPPY..
That port that you do not want to use, then must be py passed to tank...

 

[ParkerFly]

I haven't taken the pump apart and don't have it next to me right now. Here are some links pictures of the pump still on the piece of equipment if it helps any.

http://i231.photobucket.com/albums/ee45/jbcollier22/lunapic_128743391831131_1.jpg

http://i231.photobucket.com/albums/ee45/jbcollier22/IMG00004-20100520-1540.jpg

http://i231.photobucket.com/albums/ee45/jbcollier22/IMG00002-20100520-1540.jpg

 

[AKKAMAAN]

I haven't taken the pump apart and don't have it next to me right now. Here are some links pictures of the pump still on the piece of equipment if it helps any.



it is un unfamiliar pump to me...you have to test if it build pressure independently on the two ports

 

[wdchyd]

Looks like a single sectioned Webster Gear pump to me....it may have a priority bypass built in to the rear cover that does not show on the pics, but looks like a single gear section.

Does it have three ports on the rear cover or two?

 

[glastron23]

am i missing something???/ i only see 2 hoses, the top should be the pressure line and the bottom should be the suction???? it looks like an old Gresen pump.. Jim

 

[Iplayfarmer]

Test it...

Make sure you have a fluid supply to the inlet port and cap the one outlet. Try to turn the pump by hand. If you can't turn the pump (or it's very hard) you can't cap that port. If it turns just fine and fluid comes out the other port, you'll be fine.