Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-12-2020, 12:09 PM   #1
Senior Member
 
neworleansrich's Avatar
 
City: New Orleans
Vessel Name: Catalyst
Vessel Model: 50 ft Power Cat
Join Date: Sep 2013
Posts: 141
Twin Disc Mg-507-1 high pressure

One of my Twin Disc MG-507-1 gears is running at about 270psi. It had been running at 160psi like the other side. (I verified 270psi is correct with a mechanical pressure gauge). The information I have from the Twin Disc manual suggests the pressure regulator (located under the shift control) is probably clogged or stuck.

While the parts schematic looks like it is a straight forward disassembly, I ask if anyone out there in Trawler Land has had this issue or had taken the shift control and regulator apart?
neworleansrich is offline   Reply With Quote
Old 08-12-2020, 01:33 PM   #2
Technical Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
270 sounds about right. Look on the tag, it usually gives clutch pressure.

If regulator was stuck, clutch pressure would be sky-high, until something broke.

Also, pressure would not be constant with changing rpm if reg was sticky. It would go low with low rpm, high with high rpm.

Seen some TD gears where port and stbd ran at different pressures (by design) due to the different clutches in action.

You need to do a little more sniffing around. First is read tags. Next swap the test gauge to the other gear.
Ski in NC is offline   Reply With Quote
Old 08-12-2020, 02:01 PM   #3
Senior Member
 
City: Middle River MD
Join Date: Dec 2019
Posts: 102
Check the owners manual but 160 is way low. Not enough pressure to engage fully. I think 270-300 is normal. I had one at 400 psi for 1000 hours before I sold that boat.
jhall767 is offline   Reply With Quote
Old 08-12-2020, 04:49 PM   #4
Senior Member
 
neworleansrich's Avatar
 
City: New Orleans
Vessel Name: Catalyst
Vessel Model: 50 ft Power Cat
Join Date: Sep 2013
Posts: 141
Thanks for the info. Both comments are helpful. I don't plan to take it apart until I'm sure I have a problem. The pressure is steady (with high and low RPMs) on both sides.
neworleansrich is offline   Reply With Quote
Old 08-12-2020, 05:09 PM   #5
Technical Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
Have you put the mech gauge on the gear showing 160psi?
Ski in NC is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 01:45 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012