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TOPIC: Bennet trim tab pump

Bennet trim tab pump 18 May 2017 15:17 #1

  • PortHoleDiver
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Ok guys, I have a '89 3870 with four bennet tabs. I was noticing they all weren't moving. Port side would work and starboard would not work. Mechanic said he switched the hose from port to starboard and then starboard would work and port would not. Said I needed a new pump. Is there another way to check the pump or is it truly a bad pump and replacing it would correct my issue. Thanks for all responses.

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Charles
'89 3870 M/Y
Located on Galveston Bay
Prior boat '85 300SB Sea Ray
Lost in Hurricane IKE

Bennet trim tab pump 18 May 2017 15:24 #2

  • builderdude
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If the pump runs one side it'll run the other. You likely need to replace the solenoid for the side that doesn't work, depending on how corroded things are at the pump sometimes it's just easier to replace the entire pump (HPU) ask me how I know :lol:

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Bennet trim tab pump 18 May 2017 16:01 #3

  • Norton Rider
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Send a message to Tabman. He'll help you troubleshoot the issue: www.baylinerownersclub.org/index.php/forum/profile/5982-tabman

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Bennet trim tab pump 18 May 2017 18:04 #4

  • 2850Bounty
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As suggested… If the pump works in both directions, you may have one of two things going on:
...... a faulty solenoid valve
...... a faulty circuit to that solenoid valve

Use the tried and proven P of E ( process of elimination).


.

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Rick E. Portland, Oregon
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Bennet trim tab pump 18 May 2017 20:19 #5

  • MonteVista
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It is definitely either the solenoid or bad connection (or both). Simple test is to press BOTH of the port and starboard switches first in one direction then the other. BOTH tabs should move, indicating pump is OK. Go from there.

Good luck.

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Bennet trim tab pump 19 May 2017 00:51 #6

  • sketch96
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Better yet, convert to electric trim tabs and get rid of the pump altogether. Nothing to leak anymore. They make a conversion kit for Bennett hydraulic to electric and you keep the same tabs. Very easy to do and less parts in the end. They also won't leak down and change position. One of the things I did to my last boat and is on the list for my current boat.

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Doug
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Bennet trim tab pump 19 May 2017 20:19 #7

  • Tabman
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Probably not the whole pump.

Check out this video https://www.youtube.com/watch?v=P3zmpXsuaH0https://www.youtube.com/watch?v=P3zmpXsuaH0

Then do step 3 below and let me know what you find.

Tom McGow
Bennett Marine

Fluid: Automatic Transmission Fluid (ATF) any type. Hydraulic Power Unit is self bleeding, running the Trim Tabs up and down 3-4 times will purge air from the system.

Fuse: 12 volt system use 20 amp in-line fuse on positive. (24v & 32v use proportionately smaller)

Red= Port Valve
Green= Starboard Valve
Blue=Motor Forward (pump pressure)
Yellow= Motor Reverse (pump retract)
Black on HPU=Ground
Orange on Helm=Control Positive

Troubleshooting

1.If one side is not operating reverse hydraulic lines on the front of the Hydraulic Power Unit to determine if the malfunction is in HPU or actuator / hydraulic lines. If after reversing the lines symptom shifts to the other side the malfunction may exist in HPU. If the symptom remains on the same side, malfunction may exist with the actuator / hydraulic lines

2. Is the unit receiving a solid 12 volts? Low voltage will some times cause the solenoids to not open preventing the tabs from moving even though the pump motor is running.

3. Conduct the following test:
Remove the wires from the helm control and touch together as follows:
Operation=Reaction
Orange (+), blue, red= Port trim tab down
Orange (+), blue, green=Starboard trim tab down
Orange (+), blue, red, green= Both trim tabs down
Orange (+), yellow, red= Port trim tab up
Orange (+), yellow, green=Starboard trim tab up
Orange (+), yellow, red, green= Both trim tabs up

If the trim tabs function correctly for each wire grouping then the switch is at fault. Also note that any loose or missing screws on the back of the switch (whether a wire is connected there or not) can cause the pump to malfunction.

This test may also be done right at the pump by substituting a "hot lead" for orange. There is usually a connector to the wire harness within a foot or so of the pump. You want to check this connection for corrosion. You may wish to cut the connector off on the pump side and try the test on bare wires.

4. If you suspect corrosion on the wire connector near the pump, cut it out, test as above and reconnect using butt splices.

5. If you conclude the problem is in the pump, contact me. Bennett Trim Tab Systems carry a five year warranty.

6. Check to see if there is a relay in line on the wiring harness near the hydraulic power unit. If there is it is an Interrupter Relay (IR1000). It prevents the system fuse from blowing if you try to actuate one trim tab up and the other down at the same time. After you test as outlined above, try removing the relay from the wiring harness and retest the unit.(Note: the interrupter relay is no longer used in current Bennett Trim Tab systems and has been replaced with a Switches that "lock out" preventing a blown fuse).

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