Table 4-1. Unit Preventive Maintenance Checks and Service(Continued)
Q - Quarterly
Inspect brush holders and brushes for
grit and dirt. Check that brushes do
not stick in holders. Check for proper
spring pressure (para 4-37). Check for
minimum brush length of 7/8 inch
Check to ensure that the brush pressure
springs will not come to within 1/8 inch
(3.2 mm) of frame before next inspection.
Main and Exciter-
Inspect pulleys for cracks and breaks
and for broken sheaves.
Check for loose or missing mounting
Inspect belts for tightness. Check to
ensure belts are not cracked, broken,
stretched, or damaged.
Inspect for bent, cracked, or damaged air
cleaner. Check filter cartridge for dirt
and corrosion. Service filter in accordance
with LO 55-2210-223-12.
Check governor for proper operation.
Air pressure shall be between 120 and 130
psi (827 and 896 kPa).
Inspect structural parts for wear, corrosion,
broken welds, cracks, and security of
mounting. Check door lock for ease of
operation and tightness.
Inspect parts for wear, corrosion, broken
welds, and loose mounting.
and Cutter Lever
Check for plugged or burned-out exhaust pipe.
Check muffler for holes, splits, or damage.
Check warning bell for proper operation.