Mighty vac 04000 question

[merc_man]

Just got a used pressure vac tester today. Was wondering if anyone else has this modle. I notice that the presure port dont register on guage only the vacuum. Was thinking of getteing a low pressure guage and plumbing in to the line off the pressure port to see if that will work.

Anyone else have this modle and how do you guys get a preasure reading.

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[Rockjock]

does it have a switch for positive pressure I think perhaps yours only does vacuum.

 

[merc_man]

Heres a pic. You can see the port on front and port on top behind where gage mounts

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[merc_man]

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[old guy]

Model 8500 has both pressure & vacuam, I don't know about the 4000.

John

 

[Conquistador3]

I had a plastic-body Mityvac (cannot remember the model) years ago: it only did vacuum.

When it broke (good riddance!) I replaced it with a metal-body 8500, which is a dual function pump (vacuum + pressure).

You can tell if your model is dual function by looking for a pressure switch near the gauge attachment: if it's not there, your pump only does vacuum.

 

[merc_man]

I just tried a air guage on a tuben the presure port and it built presure and held so should do all i need to. Just weird how it has two separate ports. One for vac and one for presure

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[LegDeLimber]

One is the intake, the other is the exhaust.
One is the vacuum, the other is pressure.
The plunger inside of the tool is a piston and it moves air just like in our saws.

To have the Mityvac use a single port for both functions would require a cluster of internal passages & valving and then it would probably be much more expensive!

 

[Poleman]

That should do both. I have that model (?) I think (looks the same) and it does both. You need to move the cap to the vacuum side when pressurizing I believe....

 

[rynosawr]

That should do both. I have that model (?) I think (looks the same) and it does both. You need to move the cap to the vacuum side when pressurizing I believe....

That is correct!


My dad has that model and we have used it for 20+ years without a problem.

You have a good one there!