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 TM 55-1925-204-12
Table 3-1. Operator/Crew Preventive Maintenance Checks and Services - Continued
Tug Diesel Large Design 3006
B - Before
A - After
M - Monthly
D - During
B/A - Biannually
Q - Quarterly
Intervals
Item
Item To Be
Procedure
Equipment Will Be Reported
No.
BDA
M Q B/A
Inspected
Not ready/Available If:
a. Air starting
Check system for leaks and loose
Low or no starting air
system
connections. Ensure the system
available to turn engine
operates properly to deliver ade-
over for blowdown and
quate cranking air. Drain sedi-
starting.
ment and water from air flasks
hourly. Check starting air control
valve, air .check valve, and air
blow down valves for leakage and
satisfactory operation. Ensure
the air flasks are paralleled by
checking flask stop valves. Check
air pressure gauge for satisfac-
tory operation. Drain air line ac-
cumulator hourly, to ensure dry
clean air to engine start controls.
b. Fuel filters
Change filters when fuel oil
pressure drops below normal
range usually 15-20 psi at 300
RPM. Fuel filters should be
changed at a minimum of 400
operating hours. On Flight II fluc-
tuating F.O. gauge indicates a
clogged fuel filter.
c. Lubricating oil,
Use OE/HDO 30/40 weight
Oil level is below bottom
filters and
lubricating oil. If engine has been
mark on dipstick/oil is
strainers
running, wait twenty minutes
diluted. Oil does not meet
before checking oil level (a ten
test standards.
hour check), add make up oil, if
necessary. Check oil in ac-
cordance with TB 43-0210 or on-
board test kit; change oil if dilu-
tion or emulsion exist or sooner if
indicated by test above.
Drain, clean and refill the lube
system every 2400 hrs or every
year whichever occurs first.
Every four hours turn lube oil
strainer handle. Every 600 hrs
clean strainer, and every 200-400
hrs replace filters.
d. Air filter
Check intake screen for dirt or
other foreign materials. The filter
silencer is equipped with
removable screens. Remove
screens and take filter screen top-
side; back blow all dirt, and
foreign matter from screen with
3-8.6 Change 1
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