TM 5-3805-248-10
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) - CONTINUED
0014 00
Table 1. Preventive Maintenance Checks and Services (PMCS) for 621B Scraper - Continued.
LOCATION
ITEM TO
ITEM
MAN-
NOT FULLY MISSION
CHECK/
SERVICE
NO.
INTERVAL
HOURS
PROCEDURE
CAPABLE IF:
Exhaust Sys- Check exhaust system pipes, clamps
Damage or leaks are noted.
66
Weekly
and muffler for looseness, leakage and
tem
damage.
ROPS/FOPS a. Check ROPS/FOPS for loose, dam-
Loose, damaged or missing
67
Weekly
aged or missing mounting hard-
mounting hardware is noted.
ware. Notify Unit Maintenance to
re-torque/replace mounting hard-
ware.
b. Check ROPS/FOPS for any signs of
Any signs of damage or
cracking in base metal or welded
cracked welds are noted.
areas.
Perform the following test of brake air
Drop of air pressure is
68
Weekly
Brake Air
System Pres- system:
greater then 5 psi (35 kPa)
in 10 minutes.
sure Test
a. Start engine and allow air pressure
to reach 110+/-10 psi (758+/-69
kPa).
b. Apply and hold service brake pedal.
Shut down engine.
c. Reading on air pressure gage should
not drop more then 5 psi (34 kPa)
after the engine is stopped for 10
minutes.
Perform the following test of brake air
Low air pressure indicator
69
Weekly
Low Air
Pressure
system:
or buzzer does not sound at
Indicator
65 psi (450 kPa).
a. Start engine and allow air pressure
and Buzzer
to reach 110+/-10 psi (758+/-69
Test
kPa).
b. Shut down engine but leave battery
disconnect switch on. Ensure trans-
mission is in N (Neutral) and park-
ing brake is engaged.
c. Apply and release service brake
pedal until air pressure drops to 65
psi (448 kPa). Air pressure indicator
light should illuminate. Buzzer
should sound.
d. Notify Unit Maintenance of any
malfunction.
0014 00-41
