Holy crap air pump pulley

[SamIam]

My PC 405 was making strange noises and it happened to be the air pump for the heat exchanger took one apart before on my old machine had a vice on a table to get the pulley off. No vice this time and it just won't come off!

Also I'm having a little problem my water pump was been dropping pressure when the machine is under load in second speed not in first? It's like a belt is slipping but if feels tight my truck mount repair guy thought governor, but the vacuum doesn't drop just the pump.

 

[JS41035]

Pretty sure I have a couple of those air pumps.
So the pressure is dropping a little. Or totally going out? If it is completely going out I would say pump clutch. You can put a bolt in the clutch to trouble shoot that.

 

[SamIam]

Drops out completely and staggers on And off

 

[SamIam]

Al ready got a new air pump just can't get the pulley off the old one

 

[Becker]

Pulley remover. Jondon pressed mine on and off for me. When I bought my 405 I had zero air at the pump. Lots of auto parts places lend tools like the puller for free with cost of tool as deposit.


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[SamIam]

Got it with some heat

 

[GeneMiller]

Stand at the machine and watch the pump to see what it's doing. Maybe the clutch is turning on and off because of a loose wire. Is the inlet screen clogged ? I've found its usually not the pump in most cases. Is Air getting in ?

Gene

 

[JS41035]

Stand at the machine and watch the pump to see what it's doing. Maybe the clutch is turning on and off because of a loose wire. Is the inlet screen clogged ? I've found its usually not the pump in most cases. Is Air getting in ?

Gene

Yep. I would make sure the water box is full. Then check the inlet water strainer inside the water box. Then check the supply hose from the bottom of water box to the low pressure side of the pump. If it is sucking air or if there is a restriction to the supply side of the pump (my guess). That would cause a pressure drop. Because it is only happening at higher rpms I would assume it's a supply issue. Higher rpm =more flow. If the pump is starving for water or sucking air it will act funky. If the problem is worse when you turn the temp gauge to bypass, that would be a good indicator that the pump isn't able to supply the flow needed to maintain the psi.

 

[Vivers]

Wonder if this is the same air pump as I had on the prochem legend. When mine wasn't working properly I lost a good bit of heat from it

 

[SamIam]

I pulled the pressure valve apart lubed it stuck it back on and it hasn't done it since my orifice was plugged to, my guy said maybe something was sticking inside the pressure regulator and cleared it self.

It sure is funny it does 2 days in a row dropping sporadically while cleaning, I drive 45 miles and it runs great. when it did it I ran out to check the water box looked fine I was thinking loose wire to the pump clutch to.


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