GHL Maxi Doser Head locked up

[AZMSGT]

I have had the GHL Maxi doser head lock up on this unit. The pump will try to start (about a 1/4 turn) then fail and make the noise heard in the video. If I take the head off and move it, then reinstall it operates normally. However if I let the unit sit for a day or two it will lock up again.

The head is well lubricated from the factory, the wheels all move freely when I pull the drive out of the head.

I have yet to employ this doser full time into my system as I honestly don't trust it.

I'm wondering if this is a systemic problem with the GHL Maxi Doser or is it just my bad luck. Had anyone else with a Maxi Doser experienced this?

I do have a ticket in at GHL on this problem. I had one head already replaced on this unit. I just don't trust this thing to do the job right now.

 

[Ditto]

Are you running the them on fast speed? I had an issue where I was running the maxi on fast supper and it would do this but on medium or slow it would not. After about a week on medium I was able to move it back to fast.

 

[AZMSGT]

Yes, they are all on fast (3). For this one I’ll drop it down to speed 2 and see how it works. Considering I‘m just testing things I can try it.

 

[AZMSGT]

@Ditto @Vinny@GHLUSA

I guess the next question is this a direct gear drive off the motor? Is there a slipper clutch to prevent damage?
Has damage been done to the gears from the first time this happend?

 

[TheHarold]

Did you contact them? What did they say?

 

[AZMSGT]

Did you contact them? What did they say?

We slowed the head down and I’m running it like this, the thought is it needs a bit of a break in. Once it’s ran at slower speed for a couple weeks I’ll crank it up and see if it can handle high speed.

 

[TheHarold]

We slowed the head down and I’m running it like this, the thought is it needs a bit of a break in. Once it’s ran at slower speed for a couple weeks I’ll crank it up and see if it can handle high speed.

Interesting. I wonder what part they are trying to “wear in”- the peristaltic tubing itself, or gears that are meshed too tightly.

 

[AZMSGT]

Interesting. I wonder what part they are trying to “wear in”- the peristaltic tubing itself, or gears that are meshed too tightly.

The grand plan is this head will dose Kalk into my tank so the truth of the matter is that if it works at slower speeds it's fine.

But the first time I plugged in either of my Maxi pumps each head made this noise and wouldn't turn. However 1 unit worked fine after the initial problem and has worked fine steady for a week. The other unit we changed one head on and the remaining head is the one in question in this post.

I don't think it's a gear mesh issue as when this problem would happen I would pop off the head and the spindle would turn fine. I'm no engineer so I can't be positive.

 

[lakai]

You mean like this ?

 

[MJV15]

We slowed the head down and I’m running it like this, the thought is it needs a bit of a break in. Once it’s ran at slower speed for a couple weeks I’ll crank it up and see if it can handle high speed.

I just got a new maxi and one of the heads is doing the exact same thing. Works fine on slower speeds though....
Where you ever able to turn the speed back up after the “break in” period was over? I ant to use it for an AWC and I guess it would still work in the slower speeds

 

[Member No 1]

I just got a new maxi and one of the heads is doing the exact same thing. Works fine on slower speeds though....
Where you ever able to turn the speed back up after the “break in” period was over? I ant to use it for an AWC and I guess it would still work in the slower speeds

I'm doing AWC with the Maxi set on Speed 2. It's set up using the 2 float method changing ~1.5gal/day - twice a day. No issues, been working great.

 

[AZMSGT]

I just got a new maxi and one of the heads is doing the exact same thing. Works fine on slower speeds though....
Where you ever able to turn the speed back up after the “break in” period was over? I ant to use it for an AWC and I guess it would still work in the slower speeds

Yes, after a week or two I was able to go up two speed #3.

 

[Dr. Jim]

You mean like this ?

My Maxi has been locking up every now and then on it's own....not necessarily when I push the Menu button like lakai. For the longest time, the blue cap would loosen up and I then I would find that the tube came off the roller. Now, it sometimes jams without the cap coming off. Here is a video I just submitted (with a ticket) to demonstrate the SOUND that is making. (I don't have a video of it jamming.)

 

[AZMSGT]

Makes you wonder if all these maxi problems are why they are not available anymore.
Ratcheting heads, lines splitting...

The Euro website when you go to the actual page for the Maxi it errors.
The US site only has one type left in stock.. guessing when it’s gone they are done.

Others have come here and asked what’s going on but GHL is being tight lipped.

Euro site:

GHL Store. GHL Produkte online vom Hersteller kaufen

Ob Aquarium, Terrarium oder Teich, hier finden Sie erstklassige Produkte für den leidenschaftlichen Anwender, made in Germany

store.aquariumcomputer.com

US site:

GHL Doser Maxi – GHL USA

www.aquariumcomputer.com

 

[Macca_75]

Having just purchased 1 I hope the line is not being dropped. I suspect it's more a supply issue for raw material due to COVID and suppliers.

But I agree - feedback seems to be consistent with possibly a design flaw. Heads locking up, clicking and lines splitting. All seem solvable to be.

Do the APEX units running the same brand of head (2 roller version) not have the same quality/reliability issues? (I don't monitor APEX threads)

 

[MJV15]

Yes, after a week or two I was able to go up two speed #3.

I ran about 5 gallons on low 5 gallons on mid and now high speed works fine. All it would take is a simple note on the doser saying that a breakin period is necessary.

I’m happy with everything else. And I’m happy that I don’t have to spend 700$ on a controller to use a 300+ doser.

 

[Macca_75]

I have a ticket logged with GHL. Went to check something for them this morning for troubleshooting. The hose has split itself. Updated the ticket - I am sure GHL will come good with warranty but I would feel more comfortable if the cause of these splitting that seems to be common was found (batch issue of hose/head), etc

 

[AZMSGT]

I have a ticket logged with GHL. Went to check something for them this morning for troubleshooting. The hose has split itself. Updated the ticket - I am sure GHL will come good with warranty but I would feel more comfortable if the cause of these splitting that seems to be common was found (batch issue of hose/head), etc

After the run around I got, I’m really interested to see what they do for you.