trouble with standard A motor

Share your phonograph repair & restoration techniques here
victorthesixth
Victor I
Posts: 131
Joined: Wed Aug 09, 2017 3:00 pm

trouble with standard A motor

Post by victorthesixth »

Every time I try to crank the motor it cranks a bit then loses it's tension and winds down uncontrollably. Any tips?
Pictures provided to see if anyone can see a problem

Thanks

V6
Attachments
motor2.jpg
motor2.jpg (118.45 KiB) Viewed 2265 times
motor1.jpg
motor1.jpg (130.79 KiB) Viewed 2265 times

52089
Victor VI
Posts: 3745
Joined: Mon Oct 03, 2011 7:54 pm

Re: trouble with standard A motor

Post by 52089 »

The spring is probably broken.

victorthesixth
Victor I
Posts: 131
Joined: Wed Aug 09, 2017 3:00 pm

Re: trouble with standard A motor

Post by victorthesixth »

How do I tell?

tomb
Victor IV
Posts: 1381
Joined: Sat Oct 24, 2015 10:46 pm
Location: riverside calif

Re: trouble with standard A motor

Post by tomb »

It could be a little gear in the middle of the motor that is slipping. Wind it up a bit holding different gears and work your way out. That is if the spring holds tension. You may have a gear slipping which will not engage the governor. Try holding the big gear to wind it. If it lets loose and you can hear it slip inside the spring canister than you have a bad spring. Please wear gloves when getting into springs and gears.. Sometimes the spring inside the canister can slip off their pin when they unwind and slip but most of the time they are broken. You have to open it up to check. Tom

52089
Victor VI
Posts: 3745
Joined: Mon Oct 03, 2011 7:54 pm

Re: trouble with standard A motor

Post by 52089 »

If you're winding it and you hear a rapid sh-sh-sh-sh-sh-sh sound, that's the broken spring rotating in the barrel.

You can disassemble the motor and open the spring barrel to be sure, or just send it out to one of the pros to check it for you. Springs can sometimes be repaired depending on where they break, but you might as well just buy a new spring.

victorthesixth
Victor I
Posts: 131
Joined: Wed Aug 09, 2017 3:00 pm

Re: trouble with standard A motor

Post by victorthesixth »

tomb wrote:It could be a little gear in the middle of the motor that is slipping. Wind it up a bit holding different gears and work your way out. That is if the spring holds tension. You may have a gear slipping which will not engage the governor. Try holding the big gear to wind it. If it lets loose and you can hear it slip inside the spring canister than you have a bad spring. Please wear gloves when getting into springs and gears.. Sometimes the spring inside the canister can slip off their pin when they unwind and slip but most of the time they are broken. You have to open it up to check. Tom
Which little gear? Thanks

tomb
Victor IV
Posts: 1381
Joined: Sat Oct 24, 2015 10:46 pm
Location: riverside calif

Re: trouble with standard A motor

Post by tomb »

If you look straight down in the motor there is a little drive gear that goes with a larger gear in the middle towards the bottom. That gear is pressed on the shaft and sometimes comes loose. I do not have a good picture of it available Look straight down in your motor and it looks like the one attached to the large gear. Also I can not tell but it looks like the small gear that is attached to the main drive gear is worn. That may be slipping. It is hard to tell for your picture but the first thing to check is your spring which is the most common. Tom

User avatar
Lucius1958
Victor VI
Posts: 3935
Joined: Tue Dec 14, 2010 12:17 am
Location: Where there's "hamburger ALL OVER the highway"...

Re: trouble with standard A motor

Post by Lucius1958 »

Looks like a Standard B motor to me.

But the diagnosis is the same: if it's not a broken spring, it's a loose gear.

Bill

JerryVan
Victor Monarch Special
Posts: 5277
Joined: Mon Aug 24, 2009 3:08 pm
Location: Southeast MI

Re: trouble with standard A motor

Post by JerryVan »

Hard to tell from your photos, but it looks like you've got some really bad gears. Can you do a close-up shot on the gears? Aside from that possibility, you have a broken spring. If you wind it, with the motor stopped, and hear the spring tension release, but see no parts spinning out of control, then the commotion is within the spring barrel and the spring is broken.

User avatar
Lucius1958
Victor VI
Posts: 3935
Joined: Tue Dec 14, 2010 12:17 am
Location: Where there's "hamburger ALL OVER the highway"...

Re: trouble with standard A motor

Post by Lucius1958 »

JerryVan wrote:Hard to tell from your photos, but it looks like you've got some really bad gears. Can you do a close-up shot on the gears? Aside from that possibility, you have a broken spring. If you wind it, with the motor stopped, and hear the spring tension release, but see no parts spinning out of control, then the commotion is within the spring barrel and the spring is broken.
Agreed: that intermediate gear looks pretty chewed up.

Bill

Post Reply