Porta power rebuild guru's a ?

[Hounddog]

Can't get this porta power to develop pressure....nothing. I found 2 o rings and replaced them....I believe their correct.... but the notched piston that is moved with the lever......haw no provisions for a o ring...it just slips in its hole...
I'm guessing mechanically the wall tolerances of that hole is tight enough to create a vacuum....and from there I'm lost.... any experience out there??? Thanks

 

[Hiball]

1st off there definitely has to be a seal on the pump piston, look again on the outer wall down in the hole hiding inside, Yiu can actually see the wear on the piston.

2nd, What was below that heavy spring? I suspect without scouring some drawings there needs to be some components that aid in building/holding pressure, I’m guessing its Overload/relief based off the spring size. Are they still in the Piston head? Or did they disappear?

 

[Hounddog]

1st off there definitely has to be a seal on the pump piston, look again on the outer wall down in the hole hiding inside, Yiu can actually see the wear on the piston.

2nd, What was below that heavy spring? I suspect without scouring some drawings there needs to be some components that aid in building/holding pressure, I’m guessing its Overload/relief based off the spring size. Are they still in the Piston head? Or did they disappear?

I'll re check that piston hole to ensure I didn't miss a seal in the wall. But your observation of the black wear area would typically be created by an o ring. As for the check valve ect.. I suspect...the head assembly breaks down further...I just haven't figured that out yet. Specifically...in the pic where I show the spring...that barrel the spring and 'ported bolt' goes into. I believe that assembly should be removable and may offer a view of the problem

 

[Hiball]

I'll re check that piston hole to ensure I didn't miss a seal in the wall. But your observation of the black wear area would typically be created by an o ring. As for the check valve ect.. I suspect...the head assembly breaks down further...I just haven't figured that out yet. Specifically...in the pic where I show the spring...that barrel the spring and 'ported bolt' goes into. I believe that assembly should be removable and may offer a view of the problem

If the components wasn’t lost upon disassembly should still be in the hole as everything is accessibly from the back side. The parts missing is either a 1 piece needle with a stem that fits in the spring or a Stem/flat that mates to a ball, with a matching lower seat. It’s a relief valve with a adjustment that prevents the pump from exceeding the 10k rating. The smaller threaded piece threads in and out increasing /decreasing seat pressure by compressing the spring -> (missing components) and allowing it to build pressure to a safe level. If by chance you didn’t spin that inner adjustment and unthreaded from the outer only, your factory setting would have been saved.

 

[Hounddog]

If the components wasn’t lost upon disassembly should still be in the hole as everything is accessibly from the back side. The parts missing is either a 1 piece needle with a stem that fits in the spring or a Stem/flat that mates to a ball, with a matching lower seat. It’s a relief valve with a adjustment that prevents the pump from exceeding the 10k rating. The smaller threaded piece threads in and out increasing /decreasing seat pressure by compressing the spring -> (missing components) and allowing it to build pressure to a safe level. If by chance you didn’t spin that inner adjustment and unthreaded from the outer only, your factory setting would have been saved.

I did some further breakdown and found the check balls and springs..one spring is broke I believe. May be the problem as the nessary pressure on the balls will not be correct....I suspect.

 

[Hiball]

Here is a diagram for your pump, the valve components in your most recent pictures is the working valve. It looks right but you are still missing a vital components from the relief/overload valve, and without it your pump won’t build pressure as I previously mentioned.

 

[Hounddog]

Here is a diagram for your pump, the valve components in your most recent pictures is the working valve. It looks right but you are still missing a vital components from the relief/overload valve, and without it your pump won’t build pressure as I previously mentioned.

Thanks for that diagram Sir!!!