Rebuilding a trim pump

Old 11-26-2009, 11:13 PM
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Join Date: Oct 2005
Location: Toledo,OH
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Default Rebuilding a trim pump

I want/ need to rebuild an old Prestolite pump. The motor ran in both directions in May so I believe it to be in the valve area.

Has anyone ever had one of these apart, are there any rebuild kits, do I just need o-rings and check balls.

Thank you
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Old 11-27-2009, 08:19 AM
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Location: Carlisle, MA USA
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Does the motor turn in both directions and not move the drive?

If it does not turn in both directions then check your relays, they go bad all the time especially if the boat sits for a while.

If it turns in both directions but the drive does not move often times it can be rams that are seized up.
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Old 11-27-2009, 10:18 AM
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What would be the best way to unseize the rams ? I have similar problems when one tab is all the way up. Thanks
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Old 11-27-2009, 08:43 PM
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Try bleeding the return line and make sure you have enough fluid in the sump tank. With the drive all the way up the rams have used most of the fluid and the pump may be air locked.
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Old 11-28-2009, 05:42 PM
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We have had many stuck rams over the years , what happens is when the sit the seals get dry and wont let the rams move . Remove pin spray CRC or any lubricant while turning piston , this will lubricate seal .

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Old 12-03-2009, 12:03 PM
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Thanks for the info about lubricating the ram/piston. Did not even consider that, let alone think it was that simple. I'll try it.


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