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DiverDennis
#1 Posted : Thursday, December 03, 2009 6:33:27 PM(UTC)
DiverDennis

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Been having a problem with both trim tabs for a while. They would extend fine but wouldn't retract correctly. Could get them to retract by pushing the rocker switch to supply short bursts of power. Had to repeat many times to accomplish full retraction. Sometimes they would retract after holding the switch down for a LONG time (>1min) and then you would hear a stammering noise as they retract, stop, retract, stop.....Motor ran fine and the solenoids were pulling in.

All voltages were good to HPU and the ground wire is bonded well. Measured all four wires on pump side of connector. Nominal 12.5v when activated. After reading all the Bennett documentation on troubleshooting and talking to the tekkie, it was sent out for an overhaul.
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1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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Docsnow
#2 Posted : Thursday, December 03, 2009 8:02:39 PM(UTC)
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Dennis

What U described sounds like a classic case of air in the Hydr. lines Think

Norm,

Big BigMs Live On Applause
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

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 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
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DiverDennis
#3 Posted : Thursday, December 03, 2009 9:20:15 PM(UTC)
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They extend fine so air in the lines was ruled out.
Surface Interval
1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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Docsnow
#4 Posted : Friday, December 04, 2009 12:06:07 AM(UTC)
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OOPS Anxious
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
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trontek
#5 Posted : Friday, December 04, 2009 9:06:46 AM(UTC)
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Don't forget that we can read 12.? volts with a meter at times but have a bad connection that will not let enough current to flow to do the work we want. Not much current flow with the volt and a half battery in the meter circuit. Find this a lot of times on tail/brake light sockets....
Jim

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DiverDennis
#6 Posted : Friday, December 04, 2009 5:41:37 PM(UTC)
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The connection plug at the pump was checked for voltage drop across each pin: zero volts with pump running. Thanks.
Surface Interval
1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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fastjeff
#7 Posted : Saturday, December 05, 2009 5:11:35 AM(UTC)
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The Bennett folks are really nice and will take care of the problem, whatever it is.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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DiverDennis
#8 Posted : Thursday, December 10, 2009 7:09:02 PM(UTC)
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Bennett didn't do JACK for me! Here's what they said...

We found the unit to be a fairly old unit; most likely early 1990's model, which has lost quite a bit of PSI over the years. The unit tested out at 260 PSI, which a standard pressure is 350 PSI. This low PSI pressure might cause some issues with deflecting your trim tabs down. Basically, it is time to see about replacing the unit with a new one, which the part number for it would be "V351HPU1" and it retails for $362.00 from any of your local marine dealers, catalog &/or Internet retailers.
MJ Thomas
Account Manager
Bennett Marine, Inc.
Quote:
...might cause some issues with deflecting your trim tabs down...
The old unit would extend fine! And there was no mention of what might have been causing my original "not retracting" problem. (A detailed description of the problem accompanied the returned HPU.)

So I say:
Thanks for the update. So that's it? I was hoping you could suggest another option. Like, perhaps rebuilding or refurbishing my unit? Isn't that possible?

MJ says:
The unit is not in any condition that would allow us to rebuild or refurbish the unit, because of the age and the condition of the aluminum pump assembly. But, we do understand your situation, so we would like to offer you a brand new V351HPU1 (includes shipping & handling) at $230.00. Please contact us at the phone number below, so we can obtain your credit card information (Visa/MC) for the order.

I guess I was expecting too much. Boo hoo!

Found one on eBay for $175 (includes shipping & handling). Thanks for reading my rant
Surface Interval
1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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ComputerJoe
#10 Posted : Thursday, December 10, 2009 8:58:48 PM(UTC)
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Thanks Dennis,
The rest of us learned that we should expect 350 psi from a new pump, and 250 is time to trash it. I have a hand-me-down unit from a friend that needs testing before I start drilling and screwing. Now to dig out a gauge, visit the plumbing supply, and get some hydraulic oil (20 weight I believe) and my battery.
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DiverDennis
#11 Posted : Thursday, December 10, 2009 9:15:38 PM(UTC)
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ComputerJoe wrote:
...get some hydraulic oil (20 weight I believe)...
Any type of automatic transmission fluid (ATF) is all you need.

See also: http://www.bennetttrimta...trimtab_installation.pdf
Surface Interval
1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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DiverDennis
#12 Posted : Monday, December 21, 2009 1:06:23 AM(UTC)
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Got the new pump hooked up. Works like a champ.
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1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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Docsnow
#13 Posted : Monday, December 21, 2009 9:16:43 AM(UTC)
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DD where's the Pix of the new hook up Think we've seen the disassembly one lets see the finished product Applause Happy Holidays enjoy your trip to FL Applause

Norm,

Big BigMsLive On Applause

HAPPY FIRST DAY OF WINTER YA ALL
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
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DiverDennis
#14 Posted : Monday, December 21, 2009 9:01:33 PM(UTC)
DiverDennis

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Docsnow wrote:
...we've seen the disassembly one lets see the finished product...
Must go to boat and take picture.....
DiverDennis attached the following image(s):
DiverDennis attached the following image(s): IMG_4481.JPG
Surface Interval
1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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Docsnow
#15 Posted : Monday, December 21, 2009 9:41:29 PM(UTC)
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we're waiting Whistle lame excuse it's in the shop out back Looking good Applause
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
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DiverDennis
#18 Posted : Tuesday, December 22, 2009 3:31:25 AM(UTC)
DiverDennis

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Hmm, just realized the lexan cover is missing in photo. Must fix soon...
Surface Interval
1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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Docsnow
#19 Posted : Tuesday, December 22, 2009 4:48:54 AM(UTC)
Docsnow

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Lets get to it DUDE hey what ya thinkThink U B on vacation or sumtin that don’t doesn’t start till the 26th enjoy FL.Applause send me a pic or two of the hot dog venders in their bikini’s somtin to keep the ole buzzard warm U’s nose what I mean Pray

Norm,

Big BigMs Live On Applause
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
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DiverDennis
#20 Posted : Tuesday, December 22, 2009 4:59:00 AM(UTC)
DiverDennis

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Copy that. We leave Friday nite. Gonna keep my eye out for any BigMs in the Fort Myers area.
Surface Interval
1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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Doug Doty
#21 Posted : Tuesday, May 11, 2010 3:13:21 PM(UTC)
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I am just cruising old repair threads and came to this and wondered what was the logic as to why the new pump fixed the tab retraction problem ??? It sounded like the solenoids were checked but they must have been faulty ???
466 Bertram FDMY, " Easy Rider "
1984 39 Marinette sedan, " LIBERTY ONE "
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DiverDennis
#9 Posted : Tuesday, May 11, 2010 4:18:06 PM(UTC)
DiverDennis

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Didn't get a real good answer from them as to why they would extend but wouldn't retract. Just the pressure was low.
Quote:
We found the unit to be a fairly old unit; most likely early 1990's model, which has lost quite a bit of PSI over the years. The unit tested out at 260 PSI, which a standard pressure is 350 PSI. This low PSI pressure might cause some issues....
MJ Thomas
Account Manager
Bennett Marine, Inc.
Surface Interval
1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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fastjeff
#22 Posted : Tuesday, May 11, 2010 11:28:58 PM(UTC)
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Usually, that's a a bad solenoid valve.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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