Hand Primer Pump

[BOBWhite]

Educate me on hand primer pumps, are there different thread sizes? I have a few older pieces of equipment with the old "unscrew and pump" type and would like to replace them with the "black top" type. The old style probably would work if I put new seals in but I prefer the newer type. Thanks

[The Heinz]

I think the primer pumps are the same size, I haven't run into a situation where someone had one that was different. Here's a visual of the pumps from PAI that I use for customers all the time; number 11 on there seems to be universal.

[mrsmackpaul]

This style tend to come undone

 

Or at least thats what I have found anyway

 

Paul

[Freightrain]

I swapped the old lock down style for the screw down version in my 300+.  No issues.  I did end up buying a screw down model as things are tighter around the pump on the 300 and that bailing ring would be a nuisance.  I never needed to pump it, the original pump was broken and I just needed something to screw into the transfer pump.

[BOBWhite]

This was the style I was wanting to replace it with: 
The one on my 285 doesn't feel like it's doing much. This type always worked well on JD stuff

[Vladislav]

As I remember they all have similar threads where you bolt them into the pump housing. And the threads are metric if I'm not wrong. Interesting that European vehicles with Robert Bosch pumps use almost similar hand primers. What we here have normaly in shops are German Bosch or aftermarket primers and I used a couple in Mack pumps.