TM 5-6115-434-12
b. Cleaning. Keep all external parts not requiring lubrication clean of lubricants. Before lubricating equipment, wipe
all lubrication points free of dirt and grease. Clean all lubrication points after lubricating to prevent accumulation of
foreign matter.
c. Changing Oil.
Note
Drain oil while engine is still hot from operation. If necessary, start and operate engine until
oil is hot, then shut down engine and proceed with oil change while oil is hot.
(1)
Open oil tank access door (fig. 1-1). Loosen oil tank filler cap and dipstick to vent tank and facilitate
draining. Remove oil drain cap and allow oil to drain completely.
Note
Inspect drained oil for metal particles which might indicate internal damage to engine. Notify
direct support maintenance if oil contains metal particles.
(2)
Remove gas turbine engine power plant access panel (fig. 1-2). Remove oil filter housing, filter element,
and packings from oil pump assembly. (See fig. 3-2.) Clean oil filter housing with an approved dry-cleaning solvent and
dry thoroughly.
(3)
Install new filter element, new packings, and cleaned oil filter housing on oil pump assembly.
(4)
Install oil drain cap. Remove filler cap and dipstick from oil tank and fill oil tank with specified lubricating
oil until dipstick indicates FULL. Allow time for oil level to recede as air is vented, then add oil until level remains at
FULL mark on dipstick. Reinstall oil tank filler cap and dipstick.
Caution Do not mix oils from different manufacturers or different specifications. If changing from one brand of oil or one
oil specification to another, flush lubrication system as described in paragraph d below.
Note
Oil level must be checked and oil replenished as required after engine has been started and
operated sufficiently to circulate oil.
(5) Reinstall gas turbine engine power plant access panel (fig. 1-2). Close and secure oil tank access door (fig. 1-1).
d. Flushing Lubrication System.
(1)
Drain oil and change filter as described in steps c(1), (2), (3) above.
(2)
Disconnect plumbing lines from oil pump assembly and from oil tank assembly to oil temperature regulator
(oil cooler) and allow oil to drain completely from lines.
(3)
Remove oil temperature regulator (para 3-40a) and allow to drain completely.
(4)
Reinstall oil temperature regulator (para 3-40b) and reconnect plumbing lines from oil pump assembly and
oil tank assembly.
(5)
Fill oil tank as described in step c(4) above.
(6)
Start engine and allow to operate at no load for approximately five minutes, then shut down engine.
(7)
Repeat steps d(1) through (5) above.
(8)
Start engine and allow to operate at no load for approximately five minutes, then shut down engine.
(9)
Replace oil filter element as described in steps c(2) and (8).
(10)
Check oil level and replenish as required.
Section III. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
3-5. General
To insure that the power unit is ready for operation at all times, it must be inspected systematically so that defects may
be discovered and corrected before they result in serious damage or failure. The necessary preventive maintenance
checks and services to be performed are listed as described in paragraph 3-6. The item numbers indicate the sequence
of minimum inspection requirements. Defects discovered during operation of the unit will be noted for future correction,
to be made as soon as operation has ceased. Stop operation immediately if a deficiency is noted during operation which
would damage the equipment if operation were continued. All deficiencies and shortcomings will be recorded, together
with the corrective action taken, on DA Form 2404 (Equipment Inspection and Maintenance Worksheet) at the earliest
possible opportunity.
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