TM 55-1930 209 14&P-91
Table C-1. Preventive Maintenance Checks and Services for Electrical Power Systems (Continued)
B - Before
D - During
A - After
H - Hourly Interval
Interval
Procedures:
Equipment Is
Item
Item to be
Check for and have repaired
Not Ready/
No.
B D
A
H
Inspected
or adjusted as necessary
Available If:
250 hrs
(e) Adjust the belts for proper tension
and tighten setscrews and bracket
support bolts.
(f) At the following daily PMCS inspection,
recheck the belts to ensure proper
tension.
CAUTION
Under no circumstances should the engine
be allowed to operate at a higher than
specified speed. Severe engine damage may
result. Check engine speed specification
when performing PMCS.
250 hrs
c. Adjust engine speed by turning the Idling
screw clockwise to increase speed and
counterclockwise to decrease speed.
250 hrs
d. Inspect engine for any fluid leakage. Cor
rect as required.
250 hrs
e. Remove red tag from switchboard control
panel.
250 hrs
f. Empty and change glass collecting bowl.
10
200 hrs
a. Notify Direct Support maintenance of 200
hours of engine operation on auxiliary
generator and request check of valve
clearances as follows:
NOTE
When rotating engines, they should always
be turned In their normal direction of rotation,
I.e., counterclockwise when viewing from the
gearbox end. The exception Is contra-
rotating engines, or rotating them clockwise
from the gearbox end.
1) The clearance is set between the top
of the valve stem rocker and arm and
should be 0.012 in (0.3
200 hrs
2) When setting valve clearances, the
following should be adopted:
(a) With the valves rocking on No. 4
cylinder (i.e., the period between
the opening of the intake valve
and the closing of the exhaust
valve), set the valve clearances on
No. 1 cylinder.
(b) With the valves rocking on No. 2
cylinder, set the valve clearances
on No. 3 cylinder.
C-37
