PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) - CONTINUED
Table 1. Preventive Maintenance Checks and Services (PMCS) for 621B Scraper - Continued.
NOT FULLY MISSION
a. Check air tank, lines and valves
Damage that would impair
operation is evident.
under rear of scraper for damaged
or missing parts.
Wear suitable eye protection and keep face and eyes away
from exhausting air tank drain valves. Failure to do so may
b. Open drain valve on the air tank to
drain all moisture and sediment.
Check for oil in draining air. If oil is
noted, notify Unit Maintenance.
Close drain valve when all air and
moisture has vented.
REAR AIR TANK
a. Visually check tire for cuts or
Tire has cuts or bulges in
bulges in tread or sidewall area.
tread or sidewall area or
Check for uneven wear or underin-
other damage that would
flation. Look for other foreign mate-
rial embedded in tread or sidewall
area. Remove foreign material if
b. Check for loose or missing wheel
Missing wheel hub cap bolts
hub cap bolts and valve stem with
or damaged valve stem are