Table 4-1. Unit Preventive Maintenance Checks and Services (continued)
W - Weekly
M - Monthly
Q - Quarterly
Item to be
Inspect trainline air hoses and fittings for
breaks, cracks, and damage. Check for
leakage and tighten fittings as required.
Check Mulitple-unit control jumpers for
breaks and frayed wires and for loose
Check receptacles for cracks, breaks, and
damage. Check terminals for corrosion and
loose contacts. Check covers and springs
Inspect resistors and shunt devices for
broken porcelain, loose connections, and
open or touching resistance elements.
Remove clapper (para 4-20) and lubricate in
accordance with LO 55-2210-224-12. Inspect
for wear. Install clapper.
Inspect wiring for cracks, breaks, and
a. Remove brush covers and inspect interior
for grit, dust, and dirt.
Compressed air used for cleaning
purposes will not exceed 30 psi
(207 kPa). Do not direct com-
pressed air against skin. Use
goggles or full face shield.
b. Service main generator by blowing out
with dry compressed air. Lubricate in
accordance with LO 55-2210-224-12.
c. Inspect brush holders and brushes for
grit and dirt. Check that brushes do
not stick in holders. Check for proper
spring pressure (para 4-35). Check for
minimum brush length of 1-1/2 inches