TM 5-6115-434-12
Caution
Do not turn screw more than three full turns in either direction.
(f)
When satisfactory cracking pressure is attained, tighten locknut.
(g)
Reconnect control air pressure line (fig. 3-5) to acceleration limiter valve. Remove gage from tee
(fig. 3-5) on fuel control assembly, reconnect fuel line (fig. 8-5), disconnect and remove gas turbine engine analyzer.
Replace connector on oil pressure sequencing switch (fig. 1-5).
(4)
Fuel control assembly governor speed setting. If fuel control assembly (fig. 3-8) is replaced or if engine
speed at full load or at no-load is not as specified, check and adjust as follows.
(a)
Connect gas turbine engine analyzer to power unit as described in paragraph 3-8b. Use tach-
generator rpm gage (fig. 3-3) on analyzer panel to check engine speed.
(b)
Start engine (para 3-8d) and accelerate to no-load governed speed. Operate at this speed for
approximately two minutes to stabilize operation.
(c)
Apply full load to engine. To apply load, open compressor air outlet as described in paragraph 2-15f,
and operate cooled air system as described in paragraph 2-15c.
(d)
With engine operating at full load, tach-generator rpm gage (fig. 33) should read 4150 10 rpm
(equal to an engine speed of 40,700 100 rpm).
(e)
If tach-generator rpm gage (fig. 38) does not read 4150 10 rpm use screwdriver and wrench
assembly (special tools) to adjust full-load governed speed.
(f)
Hold governor adjustment screw (fig. 3-5) on fuel control assembly and loosen locknut. Turn
governor adjustment screw (fig. 3-5) clockwise to increase full load governed speed, turn governor adjustment screw
(fig.3-5) counterclockwise to decrease full load governed speed. When adjustment is satisfactory, tighten locknut.
Caution
Do not turn screw more than three turns in either direction.
(g)
Close compressor air outlet as described in paragraph 2-15f, shut off cooled air system as described
in paragraph 2-15 and return the engine to no4oad governed speed.
(h)
Tach-generator rpm gage (fig. 38) should read 4242 rpm (maximum) (equal to an engine speed of
41,600 rpm).
(i)
If tach-generator rpm gage does not read 4242 rpm (maximum), use screwdriver and wrench
assembly (special tools) to adjust no-load governed speed setting.
(j)
Hold governor adjustment screw (fig. 3-5) on fuel control assembly and loosen locknut. Turn
adjustment screw clockwise to increase no-load governed speed; turn adjustment screw counterclockwise to decrease
noload governed speed.
Caution
Do not turn adjustment screw more than three full turns In either direction.
(k)
When adjustment is satisfactory, tighten locknut, disconnect and remove gas turbine engine
analyzer.
(5)
Air pressure regulator. If air pressure regulator (fig. 3-24) is replaced or if controlling air pressure is not as
specified, check and adjust as follows.
(a)
Disconnect outlet air pressure line (fig. 3-24) from air pressure regulator and connect a line between
air pressure regulator outlet port and AIR IN connection (fig. 8-) on gas turbine engine analyzer.
(b)
Start and accelerate engine to no-load governed speed. Read air pressure regulator outlet pressure
on AIR gage (fig. 3-8) on analyzer panel.
(c)
Air pressure regulator outlet pressure shall be 19.0 to 20.0 psig.
(d)
If pressure is not as specified, shut down engine. Loosen locknut on end of air pressure regulator
(fig. 3-24) and turn adjustment screw clockwise to increase outlet pressure. Tighten locknut.
(e)
Repeat check procedure until satisfactory adjustment is made. Disconnect and remove gas turbine
engine analyzer.
(6)
Centrifugal Multi-Speed Switch Setting. If the centrifugal multi-speed switch (fig. 8-15) is replaced or if
settings are not as specified, check and adjust as follows.
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