05-28-2012, 10:16 AM
Mike
That is a very common problem with many small tools. Yes those gears are hardened, or at least they are supposed to be. They are also built into the armature shaft, so cannot be replaced without replacing the complete armature, nor can they be welded safely as the heat from welding will transmit down the shaft and damage the windings.
Also what is the condition of the driven gear? It is rare that the pinion gear is worn without the driven gear being damaged.
Most times, if it is just those two parts, it is probably worth replacing them and your repair cost will still be a fraction of what a new replacement would cost. I am supplying these parts to clients regularly.
The most common reason for the damage you show is that the grease has hardened and thrown to the outside of the gear case. The grease has to be soft enough to constantly flow back to the gears to keep them lubricated.
Another reason could be loose bearings. The armature bearings should be replaced at the same time as the armature, and many come from the factory with replacement bearings already pressed on.
Walter
That is a very common problem with many small tools. Yes those gears are hardened, or at least they are supposed to be. They are also built into the armature shaft, so cannot be replaced without replacing the complete armature, nor can they be welded safely as the heat from welding will transmit down the shaft and damage the windings.
Also what is the condition of the driven gear? It is rare that the pinion gear is worn without the driven gear being damaged.
Most times, if it is just those two parts, it is probably worth replacing them and your repair cost will still be a fraction of what a new replacement would cost. I am supplying these parts to clients regularly.
The most common reason for the damage you show is that the grease has hardened and thrown to the outside of the gear case. The grease has to be soft enough to constantly flow back to the gears to keep them lubricated.
Another reason could be loose bearings. The armature bearings should be replaced at the same time as the armature, and many come from the factory with replacement bearings already pressed on.
Walter
starlight_tools, proud to be a member of Metalworking Forum since Apr 2012.