I have a Delta Radial Arm saw, model 33-990, close to 30 yrs old. It recently started having problems starting but otherwise runs well. I assume that the starting capacitor is worn out. The original manual doesn’t list either the starting or running cap or show where they are. I assume that they would be mounted on the motor in the case. None of the 3rd party parts houses list caps, but I assume that if I can access them that I should be able to get info that would allow me to purchase replacements. I might as well replace both while I have the motor apart. The first problem that I have is that I can’t figure out how to remove the motor from the ‘saw’. I have removed the 4 bolts behind the tilt gauge. Any suggestions? Also, I would appreciate any comments about getting replacement caps. Yes, I know to discharge them before touching them!
Thank you,
Chuck Crisler
Replies
It might be good to not assume first that the capacitors are the problem. It could be the contacts on the starting switch, that engages the starting capacitor. If it starts sometimes, or sluggishly, it is more likely the switch. Capacitors tend to either work or fail completely, in which case your saw would just sit there and hum. Typically the starting switch is on the end of the motor where the power comes in. It is a centrifugal switch, only engaged when the motor is stopped or turning slowly. As the motor starts and its speed increases, the switch opens up and removes power to the starting capacitor and starting windings in the motor. You might also check the main on/off switch. Switches are frequently the first things to start having problems in circuits, as the arcing as they open or close tends to burn the contact surfaces, making them more resistant to current.
For a 30 year old Delta radial arm saw I suggest you visit owwm.org. Do a search or post your question. I guarantee someone will know the answer.
[edit] I looked on owwm and could not find your RAS. I did search around the web and found - https://www.repairtoolparts.com/delta-parts/delta-33-990-parts/delta-438010290006-capacitor - which suggests there is a capacitor. That's all I've got :(
I am with jharveyb. When a start capacitor fails it is usually dead. Never heard of one working intermittently.
Second, are you sure you even have one on that motor? Not all motors use a start cap. If it does it would be on the outside of the motor, not inside. Should be a cover of some type you can remove and gain access to it (if there is one.)
But I am leaning toward sawdust inside or burned contacts.
Thank you all for the suggestions. Yes, there is a LOT of sawdust around, so I will checkout the switch. It seems sealed but dust can go anywhere. The switch will be easy (I think).
I purchased and installed a new switch and the saw runs great. Thank you everyone for the help!
Thanks for coming back and letting us know the outcome!