Table 4-1. Unit Preventive Maintenance Checks and Service(Continued)
Q - Quarterly
Inspect sand controllers for broken
welds and cracks. Make sure valves
are mounted securely.
Remove bottom plug and the quick-
disconnect flange and clean the interior.
Inspect sander control valves for proper
Clean the sander control valve by
pushing the automatic cleanout jets.
Check brake system valves and gages for
Valves and Gages
proper operation and security of
Check independent and automatic brake
Air Hoses and
Inspect air hoses and fittings for breaks,
cracks, or damage. Check for leakage and
tighten fittings as required.
Check jumpers for breaks and frayed
wires and for loose connections.
Check receptacles for cracks, breaks,
and damage. Check terminals for
corrosion and loose contacts. Check
covers and springs for damage.
Inspect resistors and shunt devices for
broken porcelain, loose connections, and
open or touching resistance elements.
Check for clogged and sprung shutters
and worn linkage. Lubricate in
accordance with LO 55-2210-223-12.
Check shutters for freedom of action by
opening and closing manually.