. Electric railway journal . ipment, and upon it depends thereliability of the service. The choice of the properperiod between overhaulings of the compressor depends altogether on circum-stances, assumingthat proper weeklyinspections are some service acompressor will oper-ate three or fouryears without re-moval from the car;in others, it must betaken down and over-hauled every twelveor eighteen it is overhauledno care should bespared to make it justas good as it waswhen turned out ofthe factory. It shouldbe entirely strippedand cleaned, all oldoil and dirt should beremoved,
. Electric railway journal . ipment, and upon it depends thereliability of the service. The choice of the properperiod between overhaulings of the compressor depends altogether on circum-stances, assumingthat proper weeklyinspections are some service acompressor will oper-ate three or fouryears without re-moval from the car;in others, it must betaken down and over-hauled every twelveor eighteen it is overhauledno care should bespared to make it justas good as it waswhen turned out ofthe factory. It shouldbe entirely strippedand cleaned, all oldoil and dirt should beremoved, and the oilgrooves and channelsshould be armatures and fields should be tested and re-paired when necessary, as is often the case, for in thebest cared-for compressor some oil will be found cover-ing the insulation of the fields, armature, brush-holdersand wiring. This oil must be removed and its effectsremedied, frequently involving the retaping of the fieldcoils. The commutator must be turned and slotted COMPRESSOR MAINTENANCE—FIG. 2—WORN VALVE AND SEAT IN HEAD the shaft straightened if bent, and the bearings refitted. It has been found in a great many cases that bakingof compressor armatures has been caused by slightlybent shafts, throwing a heavy load on the often will be found to be the cause when othercauses have been suspected. The reason for the bendingof the shafts is that many of the compressor armaturesare fitted with shafts which are too small at the pinion
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