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3) Maytronic Dolphin s300i motor repair - replacement carbon brushes
the EXACT size for the brushes =
10mm x 6mm x 5mm Carbon Brushes
anything bigger than 10mm is going to be difficult to fit in MOTOR casing due to length
also same size for
Dolphin S300i
Dolphin E40i
Dolphin Z3i
Dolphin SL 300i
Dolphin Poolstyle 40i
Dolphin Maestro 40i
you need to watch this video from LeuisureLuke before you watch my video
• Dolphin Pool Cleaner -...
Yes my soldering sucks - :)
Some important points
**YOU NEED TO PUT MOTOR CASING BACK SAME AS YOU FOUND IT (careful for reverse polarity) - CASING ENDS ARE ALSO NOT SYMMETRICAL SO MARK EVERYTHING WITH A PENCIL and PHOTOS when you take it apart**
1) open the black box slowly prising it open with your hands and a screwdriver
2) The casing of the motor is NOT symmetric - be very careful you put it back the same way how you open it (takes photos of each step)
3) Once opened you need to clean motor with high pressure air pump to blow away carbon deposits - then clean armature with Acetone to degrease it. Clean the commutator with acetone also to degrease it
4) Open carbon spring slowly with wooden tooth pick
5) solder the copper wires together of the old and new carbon brushes - make sure the wire can move up and down the brush casing as the carbon erodes ( pushed in by spring)
5) put in the commutator back in position then put the springs on again ( only after commutator is firmly back in position and aligned with brushes) - THE BRUSHES NEED TO TOUCH THE COMMUTATOR - NO CONTACT = NO STRENGTH = it will work but very little power
6) Make sure the motor casing screw holes are aligned before you put screw back in - much easier
7) that washer in the bearing head (beside brushes ) is asymmetric for a reason (dont lose it)
8) the carbon brushes will touch the commutator - they will wear and the carbon will deposit on your motor again - I use my robot 2 times a week for 7 months of the year - this robot was bought in the end of 2019 so i got 3 full seasons out of it
9) Clean the motor casing inside with acetone
10) grease the bearings (dont go mad with grease as it gets everywhere when you put it back in casing)
11) when you put motor back in Black Box - the impeller shaft casing is NOT symmetric - you need to put it back in so that slide in safety clip properly
9) put the lid on the black box together upside down - use silicon grease around the edges - make sure wires are not caught - dont skimp on grease here - water in the black box = game over
11) the impeller now should turn with your finger - dont over tighten the impellor screw
12) some guys doing these videos are using power tools for the screws - madness as the plastic itself is very brittle and you can easily ruin the screw heads - use your hands and a screw driver
10) thanks to Leisure Luke for inspiration for this video