Hobart Pipeliner Instructions Manual page 35

PART THREE - MAINTENANCE INSTRUCTIONS
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in the direction of rotation of the armature, lifting the brushes on the return
stroke. Continue until all the brushes have the same curve as the armature. Do not
bevel the edges of the brushes. When the brushes have the same curvature as the
commutator, remove the sand-paper and blow all the carbon dust out of the machine.
CAUTION
DO NOT use emery paper to sand the brushes
as the dust will short the commutator.
39. CARING FOR COMMUTATOR
a. MAINTENANCE PROCEDURE - If the commutator is dirty, apply a piece of heavy
canvas directly to the commutator with a stick. A burnishing action will result
which effectively removes foreign accumulation. If grease is found on the commuta­
te it must be removed to prevent arcing. Use a solvent type cleaner, and then
grease bearings more sparingly.
40. GENERATOR WINDINGS
a. Blow out dirt monthly with compressed air or remove with a suction type
cleaner with a non-metallic nozzle. If the windings should become slightly damp,
use space heaters or electric light bulbs to effectively dry the windings. If the
dampness is excessive, apply external heat under a canvas cover, well vented. Heat
ing should not exceed 194°F. A low voltage current can be circulated through the
windings, but it should be only a fraction of the full load current, and the temp­
erature limitation should be observed.
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