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Author Topic:   Bennett Trim Tab Operation

chaparral24 posted 12-21-2009 10:19 AM ET (US)
My pump motor will operate and move my tabs to the DOWN position only. When attempting to move the tabs to the UP position,the motor will not operate and the tabs stay down. I've removed the unit from the boat for bench testing. The 4-wire connector in the engine room is getting voltage from the helm switches in all modes. Does the pump motor turn two ways? Or is the flow of hydraulic fluid just redirected by the solenoid valves? If I were to apply voltage to the yellow wire only (pump motor power in DOWN mode?) and the motor does not run, what do I check next?
Feejer posted 12-21-2009 10:33 AM ET (US)
Give them a call. I have heard the have excellent customer service.
Bella con23 posted 12-21-2009 11:51 AM ET (US)
I found this on a different site dated 2002.
Working on on my Bennett w351 pump, the information seems to be accurate.

The system is setup with an electric motor that runs Forward (Blue wire) and Reverse (Yellow wire) to provide the down and up action for the trim tabs. It also has two solenoid valves to separate which tab to be moved. There is a Red wired one for Port and a Green wired one for Stbd, just like navigation!
The following is a Trouble Shooting Guide for the system:
Red = Port Valve
Green = Stbd Valve
Yellow = Motor reverse, tab(s) up
Blue = Motor forward, tab(s) down
Orange = Power, located at trim tab control
Black = Ground, found on backside of HPU
Please conduct the following hot wiring tests starting at the trim tab control and working your back the HPU. Ensure you are working with proper voltage (12 volts for most systems, 20 amp fuse):
Blue + Red + Power = Port tab down
Blue + Green + Power = Stbd tab down
Blue + Red + Green + Power = Both tabs down
Yellow + Red + Power = Port tab up
Yellow + Green + Power = Stbd tab up
Yellow + Red + Green + Power = Both tabs up
Please get back to me with your findings and with the age of your system, since it has a 5 year warranty! You can contact me at the email address or phone number below.
I look forward to your reply.
Sincerely,
MJ Thomas
Bennett Marine, Inc.
Client Services
954-427-1400
954-480-2897 Fax[edited]

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Author	Topic: Bennett Trim Tab Operation
chaparral24	posted 12-21-2009 10:19 AM ET (US) My pump motor will operate and move my tabs to the DOWN position only. When attempting to move the tabs to the UP position,the motor will not operate and the tabs stay down. I've removed the unit from the boat for bench testing. The 4-wire connector in the engine room is getting voltage from the helm switches in all modes. Does the pump motor turn two ways? Or is the flow of hydraulic fluid just redirected by the solenoid valves? If I were to apply voltage to the yellow wire only (pump motor power in DOWN mode?) and the motor does not run, what do I check next?
Feejer	posted 12-21-2009 10:33 AM ET (US) Give them a call. I have heard the have excellent customer service.
Bella con23	posted 12-21-2009 11:51 AM ET (US) I found this on a different site dated 2002. Working on on my Bennett w351 pump, the information seems to be accurate. The system is setup with an electric motor that runs Forward (Blue wire) and Reverse (Yellow wire) to provide the down and up action for the trim tabs. It also has two solenoid valves to separate which tab to be moved. There is a Red wired one for Port and a Green wired one for Stbd, just like navigation! The following is a Trouble Shooting Guide for the system: Red = Port Valve Green = Stbd Valve Yellow = Motor reverse, tab(s) up Blue = Motor forward, tab(s) down Orange = Power, located at trim tab control Black = Ground, found on backside of HPU Please conduct the following hot wiring tests starting at the trim tab control and working your back the HPU. Ensure you are working with proper voltage (12 volts for most systems, 20 amp fuse): Blue + Red + Power = Port tab down Blue + Green + Power = Stbd tab down Blue + Red + Green + Power = Both tabs down Yellow + Red + Power = Port tab up Yellow + Green + Power = Stbd tab up Yellow + Red + Green + Power = Both tabs up Please get back to me with your findings and with the age of your system, since it has a 5 year warranty! You can contact me at the email address or phone number below. I look forward to your reply. Sincerely, MJ Thomas Bennett Marine, Inc. Client Services 954-427-1400 954-480-2897 Fax[edited]