grandpa Love
Well-known Member
Got a couple starters that were working, then got slower and then smoked and stopped. What do I need to get them going again?
- Thread starter grandpa Love
- Start date
Steve@Advance
Well-known Member
Need to open them up and take a look.
It might just be mud dobbers or a grease caked commutator, dirty stuck brushes, broken or rusted brush springs. Worn brushes can be deceiving, they may look good, but be just short enough they have run out of travel and not firmly in contact with the commutator.
Most common failure is with the armature, shorted, melted solder, failed segments on the commutator. If any of the segments are heat discolored or burned, the armature is bad.
Field windings are pretty tough. Look for broken connections.
Bad bushings cause the armature to drag inside the field windings, creating high amp draw and heat from friction between the components. If it looks repairable be sure to include inspecting and replacing the bushing if needed. They need to be fairly tight.
It might just be mud dobbers or a grease caked commutator, dirty stuck brushes, broken or rusted brush springs. Worn brushes can be deceiving, they may look good, but be just short enough they have run out of travel and not firmly in contact with the commutator.
Most common failure is with the armature, shorted, melted solder, failed segments on the commutator. If any of the segments are heat discolored or burned, the armature is bad.
Field windings are pretty tough. Look for broken connections.
Bad bushings cause the armature to drag inside the field windings, creating high amp draw and heat from friction between the components. If it looks repairable be sure to include inspecting and replacing the bushing if needed. They need to be fairly tight.
OP
OP
grandpa Love
Well-known Member
Steve, will try to get pictures of one we have apart..... maybe Saturday. Hopefully can get some more advice then!
muleboss
Member
- Location
- Burlington, Kansas
Most of the cub starters I have fixed were just new brushes,
old
Well-known Member
- Location
- Camdenton Missouri
You need to know how to test them for shorts with a VOM to start with. Plus in most cases it is good idea to replace the bushings/bearings at each end and of course the brushes. I've done a good many but it is one of those things I don't enjoy doing. One other thing is cleaning them up real good. If it has gotten hot you for sure need to do the VOM test for a short which can happen real easy if it got hot enough to short out windings
Geo-TH,In
Well-known Member
Like Steve said, if bushing are bad, look for signs where rotor rubbed on stator.
Bad brushes can cause smoke, then damage rotor.
Polish the commutator with emery cloth.
Install new brushes.
Many times electric drills, like starters, just need brushes.
One reason new drill have gone to brushless. Brushes wear out.
Same with generators, weak link, brushes.
Good luck.
Bad brushes can cause smoke, then damage rotor.
Polish the commutator with emery cloth.
Install new brushes.
Many times electric drills, like starters, just need brushes.
One reason new drill have gone to brushless. Brushes wear out.
Same with generators, weak link, brushes.
Good luck.
47fivewindow
Well-known Member
- Location
- Davidsonville Md.
George we were taught to use sandpaper on commutators due to the conductive properties of emery cloth. Maybe the residue could cause shorts between the bars?
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