Offshoreonly.com - Mercury racing 525efi power steering pump

Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Mercury racing 525efi power steering pump (https://www.offshoreonly.com/forums/general-q/362670-mercury-racing-525efi-power-steering-pump.html)

Mercury racing 525efi power steering pump

Can anybody tell me anything about the pressure valve mounted on the pump?

Assuming your talking about the "check valve" screwed to back of pump (that the ps hose attaches to)...it is a one-way valve that (in twin eng applications) prevents overflowing non-running eng's reservior...primarily when, only, one eng is running.

Hope that helps!?!...Jason
@InshoreOff

Thanks for the reply Jason.
Is that valve able to be screwed out?
If it’s not there can it affect the operation of the pump?
I fitted 525’s into a older boat and have no power assist.
I believe everything is connected right.Still have cable from helm and it is fine.
Seems like the pump is not pumping??

Did you bleed the air out of the system, are you running a cooler

Yes ran it for a long time.
Should be self bleeding by wheel turns?
Has a cooler.

If there is any foaming in the fluid it still has air in the system, I remove the serpentine belt and spin the pump with a drill while turning the wheel lock to lock.......you sure the lines arent switched

Quote:

Originally Posted by fastlane40 (Post 4704393)

The easiest way to verify pump operation is by testing output pressure with gauge set.
If you have one or more external add-on cylinders, you may want to disconnect hoses and make sure seals are not holding the rams tight from freely moving.
Since your setup is cable with power assist...I would disconnect cable from drive, and remove from the actuator. Make sure tube (that cable slides thru) is cleaned, greased, and cable slides thru freely. While cable is out make sure at helm wheel turns with ease.
If cable moves free, the actuator tube is internally clean-greased, and the pressure is good from pump...then issue is the actuator itself.

Jason
@InshoreOff

There seems to be no turbulence in the pump reservoir.
i have checked the cable and it is free.
Need to check output pressure next.
Saginaw rack,high pressure line is on left looking at transom?

Put a gauge on the pump outlet and nothing.
No resistance at all when turned by hand.
Can only be the pump??

Pulled the pump from one of the race motors and straight away power steering.
It is very jerky and ratchety.How long should it take to get all the air out of the system.
Ran it at idle turning wheel back and forth for 3 minutes.
F2 Speedy thanks for your help.

Quote:

Originally Posted by fastlane40 (Post 4704962)

Are you running full hydro steering ? ITS ?.......... Im running the Cadi pump and the valve looked the same when changing it out.

This is a rebuild and am yet to fit external hydraulic.
I do have it all to fit.
Is the valve internal in the pump?

unscrew the the the large nut where the high pressure line hooks up it site behind there

What do you think about the jumpy ratchety feeling in the steering now,Air??
It feels like air but I would think it should have bled itself by now.
Thanks too,you've been a great help.

Just reread one of your posts.
I wouldn't have power assist if the lines were crossed?
Wonder if the rack failing gives similar symptoms.

Im not sure , Ive not done power assist, can you post pics ?