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Old 03-07-2011, 05:24 PM
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Default Trim Tab leak

Had the boat hauled last week and saw fluid leaking out where the cylinder meets transom took off from the transom and applied teflon tape to the threads and no more leak. now it seems that the tab will go down but not back up I hear the pump when it goes down but nothing when i try to get it to go up any suggestions
Thanks
Tim
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Old 03-07-2011, 05:47 PM
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Tim,

What type of boat do you have and how old is the system?

I think that when you put the Teflon tape on the pipe nipple you screwed it too far into the upper hinge and it is now blocking the fluid passage into the cylinder. The pipe nipple. When installing the pipe nipple Teflon tape should not be used and it needs to be turned only two turns past finger tight.

You do use Teflon tape when putting the female elbow on to the end of the pipe nipple inside the boat. Care should be talen to hold the pipe nipple with vise-grips when tightening the elbow so that it doesn't screw deeper into the upper hinge.

The best way to repair the leak would be to replace the upper hinge with a new one with good threads. The upper hinges on the actuators are easy to replace and I can send you one at no charge if you like, just send me a private message with your address.

Tom McGow
Bennett Marine
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Old 03-08-2011, 02:45 AM
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Will do
If you can you please send a diagram so we are talking about the same parts
Not sure the age of the tabs they were on the boat when I purchased it The boat is a 28 topaz
Thanks
Tim
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Old 03-08-2011, 02:56 AM
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Would the pump make any noise even if the nipple was to tight?
I'm guessing that the boat will have to be out of the water to change the upper hinge
How would I bleed the system after I change the upper hinge
Thanks
Tim
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Old 03-08-2011, 05:09 AM
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Tim,

I answered your post too quickly last night and missed the part that it went down but not up! You are correct that you should hear the pump when it is trying to come up. Take a look at step 3 and step six below. Pay particular attention to the back of the switch, a loose or missing screw could cause the problem you are experiencing.

Tom
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. If it works the IR1000 will need to be replaced. Note: The IR1000 relay is no longer used in current Bennett Trim Tab systems and has been replaced with Lock Out Rocker Switches.
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Old 03-08-2011, 01:07 PM
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Tom I think it is the rocker switch
Where do you advise I get a rocker
Thanks
Tim
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Old 03-08-2011, 01:44 PM
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Tim,

If all of the screws are intact and you did step 3 in the troubleshooting and the system worked, then it is the switch.

Do a search for a Bennett ES2000 to find you best deal!

Tom
Bennett Marine
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Old 03-08-2011, 03:31 PM
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thanks
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