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Old 11-19-2019, 07:36 PM   #1
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Trying to Locate Hydraulic reservoir

We have a 2003 Mainship 390, and I am trying to locate the Hydraulic reservoir for the trim tabs, Motor is working fine, but the tabs will not move, I am sure I have a leak and just need to trace the system many thanks
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Old 11-19-2019, 09:44 PM   #2
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On our 2003 Mainship the trim tab reservoir is part of the pump. There is a small black plug. Sorry, not at the boat and I can't remember the brand of the tabs. I know it's not Bennett.
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Old 11-20-2019, 06:14 AM   #3
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In 2003 your 390 probably has Bennett. Small chance they are TrimMaster. If you can find the black tubing coming in through the transom the pump in most boats is usually in the vicinity of the steering gear. They do make some noise so maybe open the aft cockpit hatch and have someone activate the control while you listen. As mentioned, the pump and reservoir are combined

The pump uses ATF

What makes you think you have a leak?

Bennett has a very good trouble shooting guide at their website and excellent customer service

https://bennetttrimtabs.com/


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Old 11-20-2019, 11:45 AM   #4
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Keysdisease, thank you for jogging my memory. The trim tabs on our Mainship are indeed TrimMaster.
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Old 11-22-2019, 03:42 PM   #5
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Quote:
Originally Posted by Keysdisease View Post
In 2003 your 390 probably has Bennett. Small chance they are TrimMaster. If you can find the black tubing coming in through the transom the pump in most boats is usually in the vicinity of the steering gear. They do make some noise so maybe open the aft cockpit hatch and have someone activate the control while you listen. As mentioned, the pump and reservoir are combined

The pump uses ATF

What makes you think you have a leak?

Bennett has a very good trouble shooting guide at their website and excellent customer service

https://bennetttrimtabs.com/


I can here tab motor running when I move the levers but the tabs do not retaract and extend, thus my thought is it has lost fluid
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Old 11-22-2019, 03:44 PM   #6
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Quote:
Originally Posted by Keysdisease View Post
In 2003 your 390 probably has Bennett. Small chance they are TrimMaster. If you can find the black tubing coming in through the transom the pump in most boats is usually in the vicinity of the steering gear. They do make some noise so maybe open the aft cockpit hatch and have someone activate the control while you listen. As mentioned, the pump and reservoir are combined

The pump uses ATF

What makes you think you have a leak?

Bennett has a very good trouble shooting guide at their website and excellent customer service

https://bennetttrimtabs.com/


They are Trim Master
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Old 11-22-2019, 05:43 PM   #7
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Trim Master used their own special fluid, about which I haven't found much information. I've been told that ATF is acceptable, but I'm still not sure about that. If anyone here has more accurate info I would appreciate it.
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Old 11-23-2019, 06:13 AM   #8
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I can here tab motor running when I move the levers but the tabs do not retaract and extend, thus my thought is it has lost fluid
Not necessarily. I'm a Bennett guy, but TrimMaster operated in a very similar fashion. The pump has 3 electrical components, the motor and 1 solenoid each for port and starboard actuators. In order to deploy or retract a tab the motor has to turn and the appropriate solenoid(s) need to open, simultaneously. If there is an electrical problem with a solenoid you could hear the motor run but the tabs would not move because the solenoids do not open. From corrosion in wiring, control or connections, the motor will just run slower, but the solenoids are much more voltage sensitive.

There is usually a connector between the wire harness and the pump near the pump that is often the culprit. Connections at the control are sometimes the problem. You may have a leak, in which case you would have fluid in the bilge or a sheen on the water.

Find the pump by ear, if it has fluid you may just need to clean some elect connections. A solenoid or the control may need to be replaced. But if you can hear the motor running, the pump itself is usually good.

The basic Bennett troubleshooting guide is still a good tool across hydraulic trim tab brands for both Boat Leveler and TrimMaster
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Old 11-24-2019, 10:50 AM   #9
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Not necessarily. I'm a Bennett guy, but TrimMaster operated in a very similar fashion. The pump has 3 electrical components, the motor and 1 solenoid each for port and starboard actuators. In order to deploy or retract a tab the motor has to turn and the appropriate solenoid(s) need to open, simultaneously. If there is an electrical problem with a solenoid you could hear the motor run but the tabs would not move because the solenoids do not open. From corrosion in wiring, control or connections, the motor will just run slower, but the solenoids are much more voltage sensitive.

There is usually a connector between the wire harness and the pump near the pump that is often the culprit. Connections at the control are sometimes the problem. You may have a leak, in which case you would have fluid in the bilge or a sheen on the water.

Find the pump by ear, if it has fluid you may just need to clean some elect connections. A solenoid or the control may need to be replaced. But if you can hear the motor running, the pump itself is usually good.

The basic Bennett troubleshooting guide is still a good tool across hydraulic trim tab brands for both Boat Leveler and TrimMaster
Many thanks Next time at the boat I will see if there is fluid cheers
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