Used m400 dolphin

shwn2405

Well-known member
Jun 7, 2021
52
Terre Haute, IN.
Pool Size
17200
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-9)
Just bought it used dolphin m400, The previous owner said that wheel bearings just got replaced by the local pool store. Purchased it for $350. any tips or tricks would be greatly appreciated. Or you could tell me I got ripped off. I had them demonstrated for me and I climbed the walls and everything
 

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BowserB

Silver Supporter
Jul 29, 2018
728
"Old" Katy, TX
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
I have the M500--Same as yours but with a nearly useless Bluetooth connected app (indeed, I have the program set to bottom and sides and a 3.5 hour run cycle and never change it.) What I find appealing about this cleaner is
  • Three brushes vs the typical two, with the third brush in the center of the bottom, between the two vacuum slots. That third brush rotates counter to the front and rear. I believe that is why it seems to pick up everything big and small, even Sahara dust mud.
  • With the floats properly adjusted, it cleans right up to and slightly above the water line.
Negatives, and these may apply to other robotics as well: it needs water at least about 18 inches deep, so it won't clean a sun shelf; it also won't climb my steps; when it encounters things on the wall (drains, lights), it just backs down and moves on; and...this sucker is heavy which by now you know, and it's especially heavy coming out of the water until it drains (my wife cannot lift it out of the water.) I assume you wouldn't try to pull the cleaner out of the water by the cord! Finally it's too big to do much of anything in our attached spa.

After my approximately weekly run, I remove it from the pool to clean out the filter compartments and--with the cleaner on its side with the two doors open--thoroughly hose inside and out with fresh soft water--and I mean thoroughly. I don't leave an expensive machine to dry with salty chlorine water on plastic, rubber, and metal parts. I also hose off the low voltage power cord, especially the swivel joint. Then I put it on the caddy to dry, after which I have an old chair cover I put over it to protect from the sun, although the thing is stored on a covered patio.

You probably don't know how the previous owner used the one you bought. If it was left in the water, it could have had chlorine that has seeped inside. If the bearings have been recently replaced it might have been left in the chlorine water for extended time. Hopefully, the repair service did a cleaning as part of their repair. If you employ my OCD approach to cleaning after use, I suspect after a few runs it will be free of old chlorine and salt residue and you will have a bargain priced excellent cleaner.
 

shwn2405

Well-known member
Jun 7, 2021
52
Terre Haute, IN.
Pool Size
17200
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-9)
Thanks for the reply @BowserB, If you look at the picture its missing the front two climbing rings. I found that out after further researching on TFP. So, I ordered 4 new climbing rings and two new tracks. Yeah, the pervious owner left it outside and didn't take care of it. I plan on cleaning it up and inspecting everything. I figured a white easer might help clean up all the scuff marks on the plastic. I figured the Bluetooth would be worthless. Was happy to see it did climbs walls without all the climbing rings.
 

m a hanson

Well-known member
Apr 25, 2021
67
Central New York
Pool Size
13000
Surface
Vinyl
Chlorine
Liquid Chlorine
Thanks for the reply @BowserB, If you look at the picture its missing the front two climbing rings. I found that out after further researching on TFP. So, I ordered 4 new climbing rings and two new tracks. Yeah, the pervious owner left it outside and didn't take care of it. I plan on cleaning it up and inspecting everything. I figured a white easer might help clean up all the scuff marks on the plastic. I figured the Bluetooth would be worthless. Was happy to see it did climbs walls without all the climbing rings.
Well you got a deal, because the caddies alone are 199.00. I think you will not regret your purchase.
 
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Katodude

Silver Supporter
Aug 22, 2017
2,205
West Palm Beach/Florida
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
Oh yeah, just noticed it did not have the climbing rings. I dont know if they actually do anything.

I will say, the third extra brush is probably the best thing about this cleaner.
 
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shwn2405

Well-known member
Jun 7, 2021
52
Terre Haute, IN.
Pool Size
17200
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-9)
@Katodude @BowserB
I don't think he cleaned up too bad. $90 worth of parts all together I have $440 in it. Hopefully it lasts
 

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