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Ask Dominick Your Own Question
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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I have a boat that the trim will go up but not down, i had

Customer Question

hello i have a boat that the trim will go up but not down
JA: Sometimes boat issues seem like they'll be really complicated, but end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.
Customer: i had recently changed the hydraulic lines
JA: Is there anything else the Marine Mechanic should be aware of?
Customer: i just changed a hydraulic line
Submitted: 12 months ago.
Category: Boat
Expert:  Jason replied 12 months ago.

Hello, my name is Jason.

Which engine/trim system are you working on?

Customer: replied 12 months ago.
i have an earlier model mercury 135 hp/ the trim pump is does not have a reservoir
Expert:  Jason replied 12 months ago.

Is this a Mercury 135 outboard or a Mercruiser 135 sterndrive?

Customer: replied 12 months ago.
it is and outboard - saw a video and the guy had the same pump as i do has the 115hp i have the 1335 ho that the only difference
Expert:  Jason replied 12 months ago.

All Mercurys are cataloged by serial number, can I get that number so I know exactly which engine you have.

Customer: replied 12 months ago.
Customer: replied 12 months ago.
the trim is all the way up and i can see the serial tag number
Customer: replied 12 months ago.
the switch is working and i can here the pump trying to bump/ it was working just fine just had a hose that needed to be replaced. i was filling the it with and it wants to go up but not down. i loose the hoses to see if any fluid was going to the hydraulic fluid. i was but not building real pressure. the fluid looked a bit milky looking. when i made a dip stick to check if i had water in the oil it looked like there was a lot of air bubbles in it. so i let sit over night. woke this am it is still not working
Customer: replied 12 months ago.
jason would would it be best if i use the phone call feature?
Customer: replied 12 months ago.
from what i gather this is a pre-alpha trim pump
Customer: replied 12 months ago.
jason? anybody?
Customer: replied 12 months ago.
no worries jason i saw enough youtube videos to find out i just need to clear out the old fluid and the trim is working

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