Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 10-10-2020, 05:22   #1
Registered User

Join Date: Feb 2013
Location: Gulf Breeze, FL
Boat: Chatam Extreme 50
Posts: 3
Groco Transfer Pump Reversed?

Good morning Cruisers- Brain teaser for your morning. Aboard my Chatham Extrem 50, I have two diesel tanks. One is a slave, the other the source, with a Groco SPO-60-N 12v (Not the reversible unit) in line to move fuel from one to the other. The boat was in the yard for 6 months and now that she is back in the water, the pump seems to be pumping in reverse. The sound of bubbling air in the slave tank, air releasing at the vents, and no movement in the gauges after running for 25 minutes. My contractor says they DID NOT touch the pump or it’s wiring. Has anyone experienced this and how did you solve? Thanks in advance.
Desssertfirst is offline   Reply With Quote
Old 10-10-2020, 05:35   #2
Senior Cruiser
 
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 2,630
Re: Groco Transfer Pump Reversed?

You've presented pretty good evidence of the pump pumping backwards; it pumps backwards.

My suggestion is that you simply disconnect the wiring at the pump and, with your multimeter, determine the orientation of the 12v DC with the switch on. That is not meant to assign blame for it being backwards, but gives you the starting point for tracking down where the circuit was reversed.
__________________
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 10-10-2020, 06:02   #3
Registered User

Join Date: Feb 2013
Location: Gulf Breeze, FL
Boat: Chatam Extreme 50
Posts: 3
Re: Groco Transfer Pump Reversed?

Thank you tkeothlu. I’ve tracked the wiring (it is well marked) and nothing changed from the days when it worked in the correct direction. My contractor suggests that it may be the impeller. Does that ring true to you? That said, I will break out my multimeter when in the boat this afternoon.
Desssertfirst is offline   Reply With Quote
Old 11-10-2020, 05:31   #4
Senior Cruiser
 
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 2,630
Re: Groco Transfer Pump Reversed?

Have you tried simply reversing the wires at the pump? If it's orientation that is creating the problem, that should show it.

If that isn't it, let's think about something in the sceanario being wrong. Is the pump itself mounted the usual way, or could it have been flipped?

It's possible to put an impeller in with the vanes tipped over the wrong way, but that should either straighten out on the first rotation or tear up the impeller.

Any progress to report? Either success, or more information to consider?
__________________
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 11-10-2020, 10:53   #5
Registered User

Join Date: Sep 2017
Location: Langley, WA
Boat: Nordic 44
Posts: 1,387
Re: Groco Transfer Pump Reversed?

Quote:
Originally Posted by tkeithlu View Post
Have you tried simply reversing the wires at the pump? If it's orientation that is creating the problem, that should show it.

If that isn't it, let's think about something in the sceanario being wrong. Is the pump itself mounted the usual way, or could it have been flipped?

It's possible to put an impeller in with the vanes tipped over the wrong way, but that should either straighten out on the first rotation or tear up the impeller.

Any progress to report? Either success, or more information to consider?
This is not an impeller pump in the sense of an engine water pump">raw water pump. It is individual vanes on a slotted hub. They cannot be "inverted" or installed backwards.

I have one of these that was sold as a deckwash pump and found it to be a poor pump for water. It might be more suitable for a self lubricating fluid like diesel fuel or lubricating oil.

My guess is that the vanes are worn to the point where it will not pull a prime. They do sell rebuild kits for these.

PS. I tried to edit the first sentence of my response to remove the extraneous words and quote mark but it will not change. Weird.
stormalong is online now   Reply With Quote
Old 11-10-2020, 12:24   #6
Senior Cruiser
 
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 2,630
Re: Groco Transfer Pump Reversed?

Thanks for speaking up, Stormalong. That helps make sense out of the situation.
__________________
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 11-10-2020, 17:04   #7
Registered User

Join Date: Feb 2020
Location: Port adelaide south australia
Boat: Cheoy lee perry 48
Posts: 55
Re: Groco Transfer Pump Reversed?

A sliding vane pump with worn vanes may at times cavitate,it will drag air but not heavier liquids .just maybe, change wireing for rotation ,just maybe .⚓️��⛵️
Searles is offline   Reply With Quote
Old 26-10-2020, 18:26   #8
Registered User

Join Date: Feb 2013
Location: Gulf Breeze, FL
Boat: Chatam Extreme 50
Posts: 3
Re: Groco Transfer Pump Reversed?

Problem Solved! Yes, my contractor said that they “did not touch the wiring connection at the pump” but upon following TKIethlu suggestion, testing the wiring...I found the wires were reversed. Thanks to all for your contribution. My transfer pump went from blowing bubbles to moving fuel.
Desssertfirst is offline   Reply With Quote
Reply

Tags
pump

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Reversed Polarity when connected to portable generator EmeraldCoastSailor Electrical: Batteries, Generators & Solar 2 03-08-2020 13:54
XTE Reversed? EngNate OpenCPN 0 21-06-2020 10:16
Ship icon reversed in ver. 5 hhmcsv OpenCPN 0 02-06-2019 07:09
OpenCPN Magnetic Variation Reversed? gchead OpenCPN 23 07-11-2018 23:30
Shifter is reversed Mike Vogdes Engines and Propulsion Systems 10 07-07-2014 17:25

Advertise Here


All times are GMT -7. The time now is 09:25.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.