Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-01-2019, 07:56 PM   #1
Member
 
NOGILLS2's Avatar
 
City: HAMMOND
Country: United States
Vessel Name: Fruition
Vessel Model: CHP/ Seamaster
Join Date: Nov 2019
Posts: 7
Dometic T series macerator pump

Hello all, I am looking for information to troubleshoot Dometic T series macerator pump. I replaced the duckbill valves, only to find the pump is not pumping. After a lack of information, I purchased a new pump and installed it, it is working fine. Only I am still not happy, I planned to rebuild old pump and keep it for a spare. Only I dismantled pump and cleaned and inspected it and found nothing, nothing appears to be broken, Bellows is good, o-rings pliable, so I plan to test pump tomorrow. But have been baffled that there is NO information on what to look for, or common problems. I expected to find bellows was cracked, but it is fine. Is there information out there? If so where? A lead would be much appreciated. I plan to introduce myself, after I post this.
__________________
Advertisement

NOGILLS2 is offline   Reply With Quote
Old 11-01-2019, 08:03 PM   #2
Senior Member
 
Spinner's Avatar
 
City: Seattle
Country: USA
Vessel Name: Spinner
Vessel Model: 2003 Nordic Tug 42
Join Date: Dec 2018
Posts: 150
Try contacting Marine Sanitation and Supply in Seattle:

https://www.marinesan.com/Default.asp
__________________

__________________
Regards

Sue
42 Nordic Tug Spinner
Spinner is offline   Reply With Quote
Old 11-01-2019, 08:46 PM   #3
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 5,771
Peggie The Head Mistress will probably have an answer for you. You might send her a PM.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
Comodave is online now   Reply With Quote
Old 11-01-2019, 10:37 PM   #4
Guru
 
syjos's Avatar
 
City: Gig Harbor
Country: USA
Vessel Name: Sandpiper
Vessel Model: Bluewater 40 Pilothouse Trawler
Join Date: Nov 2012
Posts: 811
Did you put water into the pump or grease duck bills with Vaseline? Without water, the pump will sometimes not pump.

When the pump is on, does the bellows go up and down? If not gearbox is broken.

When reassembling bellows to pump, the lid O-ring sometimes get twisted or the one inside the bellows come out of the groove or gets pinched causing an air leak. The O-ring inside the bellows has always been troublesome during reassembly. Grease the O-rings with Vaseline real good and when inserting the bellows, push it on gently until you feel resistance, which is the inner O'ring. Make sure the bellows is square to the lid and push it on evenly all around with a quick push.. The goal is for the O-ring to go onto the lid squarely so it doesnt have an opportunity to squish out of the groove.

Grease duck Bills with Vaseline when assembling.

You can pressure test the pump by plugging the outlet and inserting air with an adapter. Use very little air pressure, 10 - 15 psi. Listen for leaks inside the bellows. A fine, invisible crack in the bellows at the seam can cause a leak. If you take the motor/gearbox off, you can dump the pump into a bucket of water to make small leaks easier to spot.
syjos is offline   Reply With Quote
Old 11-01-2019, 10:59 PM   #5
Member
 
NOGILLS2's Avatar
 
City: HAMMOND
Country: United States
Vessel Name: Fruition
Vessel Model: CHP/ Seamaster
Join Date: Nov 2019
Posts: 7
Quote:
Originally Posted by syjos View Post
Did you put water into the pump or grease duck bills with Vaseline? Without water, the pump will sometimes not pump.

When the pump is on, does the bellows go up and down? If not gearbox is broken.

When reassembling bellows to pump, the lid O-ring sometimes get twisted or the one inside the bellows come out of the groove or gets pinched causing an air leak. The O-ring inside the bellows has always been troublesome during reassembly. Grease the O-rings with Vaseline real good and when inserting the bellows, push it on gently until you feel resistance, which is the inner O'ring. Make sure the bellows is square to the lid and push it on evenly all around with a quick push.. The goal is for the O-ring to go onto the lid squarely so it doesnt have an opportunity to squish out of the groove.

Grease duck Bills with Vaseline when assembling.

You can pressure test the pump by plugging the outlet and inserting air with an adapter. Use very little air pressure, 10 - 15 psi. Listen for leaks inside the bellows. A fine, invisible crack in the bellows at the seam can cause a leak. If you take the motor/gearbox off, you can dump the pump into a bucket of water to make small leaks easier to spot.
Thank you, this is the knowledge and wisdom I have been looking for. I will take the pump apart and follow your suggestions. I will let you know what I discover.
NOGILLS2 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





All times are GMT -5. The time now is 06:35 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×