Trim pump

[mrjamieson]

Hi guys. My A1/G2 outdrive was falling overnight. Since the engine, transom assy. and outdrive were new I replaced the old trim pump assembly. Bled the system and the overdrive doesn't fall now. The problem is the fluid aerates after a few cycles. NO visible leaks anywhere. Can the system suck in air and not leak any fluid? Again, after I bled it I have cycled it at least 20 times. Thanks

 

[alldodge]

After cycling 20 times it should be bled.
Was this a new pump or another used one?
When it aerates does the fluid stay at the same level after the bubbles go away?
What oil is being used?

 

[mrjamieson]

After cycling 20 times it should be bled.
Was this a new pump or another used one?
When it aerates does the fluid stay at the same level after the bubbles go away?
What oil is being used?

It's a brand new pump. Once the bubbles subside the fluid is still at max and the fluid is the Quicksilver "power trim and steering fluid". I used that in my old pump too.

 

[alldodge]

Well I'm scratching my head
Hey @achris have any thoughts?

 

[achris]

All I can think of is pump cavitation... But it's a new pump, so ????

 

[alldodge]

Did ya by chance look inside the tank before installing? Look for some note left inside side saying something stupid like add oil before using.

Just another thought if it might get caught against the intake to cause the cavitation

 

[alldodge]

BTW when you talk cycling, you are going full up and full down each cycle?

 

[mrjamieson]

All I can think of is pump cavitation... But it's a new pump, so ????

I've noticed that when the outdrive is all the way down, that "unaerated" fluid is below the min line. Once the air purges it's up to the max. Should I try adding it little more fluid and see what happens? Also, like I already asked, Is it possible to suck in air but not have a leak??

 

[alldodge]

The trim fluid should stay at the same level if the drive is full up or down. The pump just moves fluid from one side to the other. With you going full up and its at Min then you need more fluid

 

[mrjamieson]

Did ya by chance look inside the tank before installing? Look for some note left inside side saying something stupid like add oil before using.

Just another thought if it might get caught against the intake to cause the cavitation

No notes

 

[mrjamieson]

The trim fluid should stay at the same level if the drive is full up or down. The pump just moves fluid from one side to the other. With you going full up and its at Min then you need more fluid

I'll add more and see what happens.

 

[mrjamieson]

BTW when you talk cycling, you are going full up and full down each cycle?

Yes. Full up and down until the pumps starts to stress.

 

[harcos]

The trim fluid should stay at the same level if the drive is full up or down. The pump just moves fluid from one side to the other. With you going full up and its at Min then you need more fluid

I don't think this is correct ( trim fluid should stay the same level), an extended cylinder should always require more volume than a retracted cylinder. Just speaking from a hydraulic standpoint. I run a crane that when its down the tank is full but extended it the fluid goes below the sight glass. I realize its a different application but a ram is a ram as far as I know.

 

[mrjamieson]

I don't think this is correct ( trim fluid should stay the same level), an extended cylinder should always require more volume than a retracted cylinder. Just speaking from a hydraulic standpoint. I run a crane that when its down the tank is full but extended it the fluid goes below the sight glass. I realize its a different application but a ram is a ram as far as I know.

I tend to agree. I'm going to extend the cylinders to their max and check the fluid level after the air dissipates.