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View Full Version : Trim tab motor runs but tabs not moving



joekerins
11-28-2004, 09:33 PM
Worked a couple days ago, not today. Motor runs when switch is pushed either way. Fluid is full. Bennett tabs, switch and motor. Scratching head. Never had one of these pumps go bad they seem very reliable. Anything I should be looking for? What type of line pressure should I have? Man did I miss the tabs in todays wind.

easytimes455
11-28-2004, 10:02 PM
If Tabman doesn't contact you first... search the archives for posts by Tabman and shoot him an email. We see the best support imaginable from Bennett through Tom McGow... "The Tabman". Their support surpasses their products from our observations.

Tony
11-28-2004, 10:35 PM
You didn't mention whether you checked the wiring, behind the switch, and then at the HPU. The latter is often under water and rapidly goes funky. If the connections check out, there are solenoids in the HPU, that occasionally get locked up. Try tapping gently the lower half of the unit. Failing that, a loud help, in the direction of Tom.....

joekerins
11-29-2004, 10:15 AM
Tony,

Wiring was checked to the extent that connections are solid and corrosion free. Pump motor does run in all posistions, but I will try and give it a wack.

Anonymous
11-29-2004, 09:41 PM
joekerins

Sorry to here you are having problems with your Tabs! Lets get 'em fixed. The guy's have given good input. Look at steps two and three. If the unit is not getting good voltage the valves won't open. Often times the ground wire is corroded and will limit the power getting to the pump due to increased resistance.

Then check step three to see if the connections are good by doing the hot wire tests.

Let me know what you find and how old the pump is and I will get you going.

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. We also offer a trade in program for units out of warranty. Contact us for further details after you troubleshoot the system.

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

joekerins
11-29-2004, 09:55 PM
Tom,

Left you a post on the other board also. This ones kicking my butt. Results are:

Ran tests all passed. Problem seems sporadic here is what I could replicate X number of times. After running tests listed above I removed motor and fluid housing cover to make sure no particles or contamination was in fuild. Found none. Next I removed port line from motor and pushed bow down on port switch. Fluid pumps out of port. I connect line back to motor and both tabs work. After running tabs up and down a few times I noticed the motor sounds to run very free while bringing tabs up after they have reached their complete up posistion.
After that the motor will run but tabs will not move until I disconnect a line and run the motor to eject some fluid. This type of vapor/dry lock happened 3 out of 25 times cycling the tabs up and down. I'm stumped, it's in your court Tabman. Model on front pump housing show V351. I will email you pics of unit.

Anonymous
11-29-2004, 10:15 PM
Joe,

I must be tired, as I did not notice that it was you on the other board :roll:

I want to replace the pump. Send me your name, address, and phone #. I will send you a replacement pump. Then after you swap out the pump send back the original unit along with a a copy of the packing list that comes with the replacement. There will be no charge.

Tom
Bennett Marine

Squid Row
11-30-2004, 09:12 AM
Joe,

I must be tired, as I did not notice that it was you on the other board :roll:

I want to replace the pump. Send me your name, address, and phone #. I will send you a replacement pump. Then after you swap out the pump send back the original unit along with a a copy of the packing list that comes with the replacement. There will be no charge.

Tom
Bennett Marine


Folks,
This is why you buy Bennett and no where else. OUTSTANDING customer service!

KIRK KILLEBREW
11-30-2004, 09:31 PM
AMEN !!!!!

JAY
12-17-2004, 10:09 AM
TOM,
I JUST FOUND THIS SITE AND I LOVE IT. JUST BOUGHT MY 3RD SHAMROCK (86 PILOTHOUSE). HAVE HAD TEN BOATS BUT KEEP DREAMIN ABOUT MY FIRST SHAMMY I BOUGHT NEW IN 1988. SO, ONCE AGAIN I'M A SHAMROCK OWNER AND BENNETT TABS ARE GREAT. INSTALLED THEM ON A PENNYAN I OWNED A FEW YEARS BACK. REAL EASY INSTALL. REAL NICE OF YOU TO HELP THAT DUDE OUT. GOD BLESS !!
I must be tired, as I did not notice that it was you on the other board :roll:

I want to replace the pump. Send me your name, address, and phone #. I will send you a replacement pump. Then after you swap out the pump send back the original unit along with a a copy of the packing list that comes with the replacement. There will be no charge.

Tom
Bennett Marine

fisherofmen
12-17-2004, 11:23 AM
Tom,

WOW. What service. I've never had problems with my Bennett tabs and for sure won't worry if I do. What a great company.

Rick