Dolphin Active 20 will climb 90deg walls but not 45deg?

mixin16

Member
Mar 20, 2017
11
Grand Rapids, MI
Hello,

I have a 18x36' IG vinyl lined pool and recently scored a nice 4yo Dolphin Active 20 on marketplace for $150! The robot works great in all areas of the pool except it is unable to scrub the waterline in the deep end as it cannot climb the ~45 degree walls which lead from the floor of the deep end to the 90 degree sidewall portion. When it's on the 45 degree walls, the tracks spin as it gets about halfway up the wall and then it gives up and goes back down. It climbs the 90 degree walls in the shallow end just fine and scrubs the waterline there. I attached a pic of my pool deep end, so you can see the wall incline I'm referring to.

I am using the fine filters and have thoroughly cleaned them. I have brushed these 45 degree walls with no improvement in performance. I follow the TFP way of testing and adding chemicals - pH is currently 7.4, alk is 100ppm, and FC is usually around 4ppm from day to day.

Has anyone with a vinyl pool ever had this issue and found a fix? Thanks for your help!

Mike
 

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dschlic1

Silver Supporter
LifeTime Supporter
Oct 5, 2007
713
Valrico, FL
You might try replacing the treads. The unit depends on suction for much of its down force. When it is at an angle, the part of the cleaner where the suction is, is off the pool wall/floor reducing that down force. New treads might increase the coefficient of friction enough for it to climb the wall.
 

mixin16

Member
Mar 20, 2017
11
Grand Rapids, MI
You might try replacing the treads. The unit depends on suction for much of its down force. When it is at an angle, the part of the cleaner where the suction is, is off the pool wall/floor reducing that down force. New treads might increase the coefficient of friction enough for it to climb the wall.
Thank you! That's what I was thinking, but I didn't want to lead the conversation. The previous owner stored it outside for 4 years, so the tracks could be hardened/degraded by UV exposure... I'll put some OEM ones on order. Other than that, it's a great unit! Sure beats the manual vacuuming I've been doing for 5 years!
 
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