Zf pas pump

rasheed · Dec 26, 2011

Just wondering if anyone has ever taken apart the PAS pump to have a look inside? I have a spare pump picked up cheap from a breakers and said to be in working order. I want to use to drive an oil separator centrifuge. Have mounted the pump along with a pulley and belt to drive it from an electric motor and it turns but there is no flow. Suspect there's a one-way valve inside that's jammed or clogged but can't figure out how to open the pump to take a look.

There are these two ball bearing looking things and a huge nut. Wonder if the balls have to be drilled out first in order to access bolts or screws beneath and is that nut to be opened? Pics attached.

Cheers!

jamesmartin · Dec 26, 2011

the balls block of drillings that need to come to the outside to be drilled,have you fed oil to pump or expecting it to suck it up,there will be a valve behind the big nut iirc

wammers · Dec 26, 2011

rasheed said:
Just wondering if anyone has ever taken apart the PAS pump to have a look inside? I have a spare pump picked up cheap from a breakers and said to be in working order. I want to use to drive an oil separator centrifuge. Have mounted the pump along with a pulley and belt to drive it from an electric motor and it turns but there is no flow. Suspect there's a one-way valve inside that's jammed or clogged but can't figure out how to open the pump to take a look.

There are these two ball bearing looking things and a huge nut. Wonder if the balls have to be drilled out first in order to access bolts or screws beneath and is that nut to be opened? Pics attached.

Cheers!

Are you turning it the right way? Also don't think it will suck it has to have a head of oil above it. Also it is a low capacity pressure pump, not a high flow transfer pump, don't expect gushes of oil flow.

rasheed · Dec 26, 2011

Tony, with a head of oil above and yes, turning the right way.

James, are you saying the nut can be removed and do we have to drill through the balls first?

Thanks fellas!

wammers · Dec 26, 2011

rasheed said:
Tony, with a head of oil above and yes, turning the right way.

James, are you saying the nut can be removed and do we have to drill through the balls first?

Thanks fellas!

If that is the case the vanes maybe gummed up. Try soaking it with paraffin to free them up. Only thing you have is a low capacity vane pump with a pressure release valve in it. That valve does not effect the pumping action, just blows off and returns oil to inlet side on reaching pressure. Very simple thing the pump, but you will have to spin it fairly fast to get a good output. DON'T remove the ball seals.

jamesmartin · Dec 26, 2011

you dont need to touch the balls there fitted during manufacture of components not pump

rasheed · Dec 29, 2011

thanks again for the tips guys. still no luck but will try various other fluids to soak pump in for a few days and see if something loosens up.

wammers · Dec 29, 2011

rasheed said:
thanks again for the tips guys. still no luck but will try various other fluids to soak pump in for a few days and see if something loosens up.

You will have to spin it pretty quickly. A 4 pole electric motor turns at 1400 RPM. Driven at one to one would be a minimal speed.

Zf pas pump

rasheed

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jamesmartin

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wammers

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rasheed

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wammers

No longer with us, RIP

jamesmartin

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rasheed

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wammers

No longer with us, RIP

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