TM 5-3805-248-23-1
UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) - CONTINUED
0020 00
Table 1. Unit Preventive Maintenance Checks and Services (PMCS) for 621B Scraper - Continued.
LOCATION
ITEM TO
ITEM
MAN-
CHECK/
NOT FULLY MISSION
NO.
INTERVAL
HOURS
SERVICE
PROCEDURE
CAPABLE IF:
13
Semi-Annu-
Inspect for loose electrical connec-
ally
tions and unusual noise or bearing
play. Replace alternator as necessary
14
Semi-Annu-
Starter
Inspect for bad connection, damaged
ally
wiring, loose electrical connections or
evidence of burning. Replace starting
motor assembly as necessary (WP
Inspect valves and linkage. Look for
15
Semi-Annu-
Hydraulic
ally
Control
bent levers and control arms and worn
Valves
bushings (WP 0325 00).
16
Semi-Annu-
Torque Con-
Inspect for leaks or damage. Replace
as necessary (WP 0134 00).
ally
verter Oil
Cooler
17
Semi-Annu-
Torque Con-
Inspect for scuffing, strain, wear, leaks
ally
verter Oil
or loose fittings. Tighten loose fit-
Cooler Lines
tings. Replace as necessary (WP 0137
and Fittings
WARNING
18
Semi-Annu-
Tires
ally
Explosions of air-inflated earth moving tires can be a
result of heat-induced gas combustion inside the tires. The
heat generated by welding or heating rim components,
external fire or excessive use of brakes can result in gas-
eous combustion. A tire explosion is much more violent
than a blowout. The explosion can propel the tire, rim and
final drive components as far as 1,500 ft (460 m) or more.
Both the force of the explosion and flying debris can cause
injury or damage to equipment. All personnel should be
aware of this danger and the actions to take to minimize
the risk (TM 5-3805-248-10).
Improper use of inflation equipment can result in tire
blowout or rim failure.
a. Check for adequate tread and
replace if tread depth is insufficient
(WP 0302 00 and WP 0303 00).
b. Check for proper inflation of 60 psi
(276 kPa) for tractor 40 psi (414
kPa) for scraper.
0020 00-4
