I'm stumped with a pump
 

I have a small cast iron, gear pump that was working.

The gear is about an inch in diameter, .375 thick and the other gear (idler
type) is a bit smaller.

No blockages, no clogs, all looks good. However,
there are three set screws/plugs around the periphery of the pump
equidistant at 120 degrees.

This thing no longer pumps but tries to do so.

There are no leaks. I did fiddle with the plugs as it was not doing well.

Help, anyone?

Thanks

j/b

I'm stumped with a pump
 

On Thu, 2 Oct 2008 23:08:53 -0500, "justme" wrote:

I have a small cast iron, gear pump that was working.

The gear is about an inch in diameter, .375 thick and the other gear (idler
type) is a bit smaller.

No blockages, no clogs, all looks good. However,
there are three set screws/plugs around the periphery of the pump
equidistant at 120 degrees.

This thing no longer pumps but tries to do so.

There are no leaks. I did fiddle with the plugs as it was not doing well.

Help, anyone?

Are you spinning it in the right direction? The oil goes around the
outside of the gears and the meshing gears pushes it out the outlet
instead of letting the oil just go round and round and round...

Hidden check valve? STUCK hidden check valve?

Liquid too thin? Water and light fractions like gasoline are not
meant for gear pumps.

-- Bruce --

I'm stumped with a pump
 

On Oct 3, 12:08*am, "justme" wrote:
I have a small cast iron, gear pump that was working.

The gear is about an inch in diameter, .375 thick and the other gear (idler
type) is a bit smaller.

No blockages, no clogs, all looks good. *However,
there are three set screws/plugs around the periphery of the pump
equidistant at 120 degrees.

This thing no longer pumps but tries to do so.

There are no leaks. *I did fiddle with the plugs as it was not doing well.

Help, anyone?

Thanks

j/b

I've played with stuff like that, describes a fuel pump I messed with
to a T. Had three spigots, an inlet and two outlets. The stinker was
that it had a hidden over-pressure/check valve. Was hollow steel with
a rubber tip. The rubber tip was the sealing part, when it got hard,
crumbled and vanished, all semblance of pumping ceased, the outlet was
now directly connected to the tank and the inlet. Unfortunately, the
whole valve unit was crimped together, had to get a refurb, no
separate parts available. Hope you have better(and cheaper) luck.

Stan

I'm stumped with a pump
 

Bruce,

It is the right direction. No hidden valves that I can see.
Pump same liquid it has always pumped.

j/b


"Bruce L. Bergman" wrote in message
...
On Thu, 2 Oct 2008 23:08:53 -0500, "justme" wrote:

I have a small cast iron, gear pump that was working.

The gear is about an inch in diameter, .375 thick and the other gear
(idler
type) is a bit smaller.

No blockages, no clogs, all looks good. However,
there are three set screws/plugs around the periphery of the pump
equidistant at 120 degrees.

This thing no longer pumps but tries to do so.

There are no leaks. I did fiddle with the plugs as it was not doing well.

Help, anyone?

Are you spinning it in the right direction? The oil goes around the
outside of the gears and the meshing gears pushes it out the outlet
instead of letting the oil just go round and round and round...

Hidden check valve? STUCK hidden check valve?

Liquid too thin? Water and light fractions like gasoline are not
meant for gear pumps.

-- Bruce --

I'm stumped with a pump
 

Stan,

This only has two ports, one in, one out.


Thanks

j/b


wrote in message
...
On Oct 3, 12:08 am, "justme" wrote:
I have a small cast iron, gear pump that was working.

The gear is about an inch in diameter, .375 thick and the other gear
(idler
type) is a bit smaller.

No blockages, no clogs, all looks good. However,
there are three set screws/plugs around the periphery of the pump
equidistant at 120 degrees.

This thing no longer pumps but tries to do so.

There are no leaks. I did fiddle with the plugs as it was not doing well.

Help, anyone?

Thanks

j/b

I've played with stuff like that, describes a fuel pump I messed with
to a T. Had three spigots, an inlet and two outlets. The stinker was
that it had a hidden over-pressure/check valve. Was hollow steel with
a rubber tip. The rubber tip was the sealing part, when it got hard,
crumbled and vanished, all semblance of pumping ceased, the outlet was
now directly connected to the tank and the inlet. Unfortunately, the
whole valve unit was crimped together, had to get a refurb, no
separate parts available. Hope you have better(and cheaper) luck.

Stan

I'm stumped with a pump
 

"justme" wrote in message
...
I have a small cast iron, gear pump that was working.

The gear is about an inch in diameter, .375 thick and the other gear
(idler type) is a bit smaller.

No blockages, no clogs, all looks good. However,
there are three set screws/plugs around the periphery of the pump
equidistant at 120 degrees.

This thing no longer pumps but tries to do so.

There are no leaks. I did fiddle with the plugs as it was not doing well.

Help, anyone?

Thanks

j/b



I've fixed a worn out pump like this before by taking the center section of
the pump, the one that the gears ride in, and sanding it a little thinner.
I use 220 grit sandpaper on a FLAT surface rough side up. Sand a few swipes
across the paper, re-assemble and they usually pump again.

Shawn

I'm stumped with a pump
 

Good idea, Shawn.

I have done that with vanes in a vacuum pump and it worked just fine. It
didn't occur to me to do it with this pump. Will give it a try.

Thanks

j/b


"Shawn" shawn_75ATcomcastDOTnet wrote in message
. ..

"justme" wrote in message
...
I have a small cast iron, gear pump that was working.

The gear is about an inch in diameter, .375 thick and the other gear
(idler type) is a bit smaller.

No blockages, no clogs, all looks good. However,
there are three set screws/plugs around the periphery of the pump
equidistant at 120 degrees.

This thing no longer pumps but tries to do so.

There are no leaks. I did fiddle with the plugs as it was not doing
well.

Help, anyone?

Thanks

j/b



I've fixed a worn out pump like this before by taking the center section
of the pump, the one that the gears ride in, and sanding it a little
thinner. I use 220 grit sandpaper on a FLAT surface rough side up. Sand a
few swipes across the paper, re-assemble and they usually pump again.

Shawn