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
CHECK/
ITEM
MAN-
NOT FULLY MISSION
SERVICE
NO.
INTERVAL
HOURS
PROCEDURE
CAPABLE IF:
Check service brakes for pulling,
Brakes pull, grab or exhibit
30
During
Brakes
grabbing or reduced braking capacity.
unsafe operation.
Check for smooth, controlled steering
Steering is erratic.
31
During
Steering
without pulling or drifting.
Monitor tractor operation for unusual
32
During
Drivetrain
noise or vibrations from engine, trans-
mission, driveshafts, axles and
wheels.
Monitor bowl operations for unusual
33
During
Scraper
noise or vibrations from apron, ejec-
tors and bowl lift cylinders.
Be alert for evidence of fluid leakage.
Class III fuel, oil or hydrau-
34
During
Overall
lic fluid leaks are evident.
Leakage
Any coolant leak is evident.
With machine fully warmed up, moni- Gages indicate an abnormal
35
During
Instrument
tor warning lights and readings on
reading.
Panel
gages.
a. Engine coolant temperature range
should be in the green range.
b. Torque converter oil temperature
range should be in the green range.
c. Air system operating pressure range
is 110 +/- 10 psi (758 +/- 69 kPa).
0014 00-17
