In this video we go thru the steps to diagnose an electric induction motor not starting, having just a hum or humming noise on power up. The tool illustrated is a Ryobi BS904G benchtop bandsaw, but this video applies to the Ryobi BS904 bandsaw also.
We inadvertently do a teardown and reassembly on the single phase in-series permanent capacitor type induction motor used for your viewing pleasure, though it is not typically serviceable or repairable. Testing and replacement of the starting type 20uF capacitor is also shown.
Ryobi BS904G parts explosion repair sheets: wiki.thebodgery.org/lib/exe/fetch.php?media=equipment:bandsaw_ryobi_bs904g_repairschematic.pdf
*The eBay and Amazon search links below are paid links, for which I may be compensated and earn a commission, if you choose to buy the parts and tools shown in this video thru them:*
NGM WCB60250V20UF / CBB60 20uF capacitor: ebay.us/z1Wpxi or amzn.to/3T0cDgm
GC electronics 10-9002-A red varnish: ebay.us/ACmFRd or amzn.to/3ONzMAd
3 in 1 electric motor oil: ebay.us/yP6dXQ or amzn.to/3usPKc5
Loctite 680 green press fitment retaining compound: ebay.us/iYKIuG or amzn.to/49nAufB
Used Ryobi BS904 / BS904G motor: ebay.us/QxUgta
New Ryobi 089120406702 motor: ebay.us/YUr81h
_And if I've saved you some $$ here, consider some coins for the coffee tip-jar!_ ko-fi.com/drshock
Chapters:
0:00 - Problem overview
0:37 - Testing and sizing the capacitor
4:56 - Ryobi service information overview
6:54 - Removing the motor from the bandsaw frame
9:22 - Performing a no-load motor start test
10:32 - Performing a manual rotor spin start test
11:17 - Cleaning out the sawdust from the motor
12:57 - Disassembling the induction motor
27:17 - Electrical testing of the power switch
28:31 - Electrical testing of the motor stator windings
35:38 - Reassembling the induction motor
45:49 - Re-testing defective & replacement motors
49:07 - Reinstalling the motor to the power switch & frame
55:10 - Load test of replacement motor
56:07 - Replacing the capacitor
1:00:05 - Electrical testing of the replacement motor windings
#drshock
_Disclaimer: DrShock, the alias for the human content creator for this KZread channel, is not responsible for any damages, injuries, losses, or liabilities associated with any repairs, upgrades, or maintenance performed on yours, or any other, product whatsoever. No warranty, express or implied, is made as to the accuracy or completeness of any information provided within this channel. Viewing and using the “as-is" information of this channel is totally at your own risk. Always wear personal protection equipment and follow appropriate product manufacturer service manual guidelines with original manufacturer parts only when performing any repairs, upgrades, or maintenance upon any product._