(4) Inspect the engine overspeed governor for
shuts off at 2700 rpm. Replace the engine overspeed
cracks, loose or damaged terminals, and damaged
governor if it cannot be adjusted.
coupling at the end of the shaft. Rotate the shaft to
(7) Reconnect the engine overspeed governor.
check for rough, catching, or binding operation.
Replace a damaged overspeed governor.
(1) Remove the tachometer drive from the
(5) Inspect the governor drive shaft for cracks,
governor arm (para 4-45).
damaged teeth, distortion and other damage; replace a
(2) Disconnect the electrical leads, including the
damaged drive shaft.
ground lead (4, fig. 4-28), from the terminals at the top
(6) Inspect all other parts for cracks, distortion,
of engine overspeed governor. Tag leads to facilitate
damaged threads, and other damage; replace damaged
(3) Remove and disassemble the overspeed
d. Reassembly and Installation.
governor and related parts as shown in figure 4-28.
c. Cleaning and Inspection.
(1) Reassemble and install the engine
overspeed governor and related parts as shown in figure
Clean all parts in a well-ventilated
(2) Reconnect the electrical leads to the
area. Avoid inhalation of solvent
terminals at the top of the overspeed governor. Refer to
the wiring diagram (fig. 1-4).
fumes and prolonged exposure of
(3) Reconnect the tachometer drive and
skin to cleaning solvent.
tachometer shaft to the governor arm, and lubricate the
exposed skin thoroughly.
tachometer drive and overspeed governor. Refer to
cleaning solvent (fed. spec. P-D-680)
lubrication order LO 5-4320234-12 (fig. 3-1).
used to clean parts is potentially
(4) Check and, if necessary, adjust the engine
overspeed governor (subparagraph a above).
property. Do not use near open
flame or excessive heat. Flash point
4-47. Suction and Discharge Gages, Lines, and
of solvent is 100° to 138°F (38° to
a. Removal and Disassembly.
(1) Wipe the exterior of the engine overspeed
(1) Remove and disassemble the lines and
governor with a cloth dampened with cleaning solvent
fittings from the suction and discharge gages and from
(fed. spec. P-D-680); dry thoroughly. Take care to
the pump as shown in figure 4-30.
prevent solvent from entering the interior of the unit.
(2) Remove the cap screws (20 and 24, fig.
(2) Wash all remaining parts with cleaning
430), nuts (21 and 25), and lock washers (22 and 26)
solvent. Remove the grease cup from the governor arm
that secure the suction and discharge gages (23 and 27)
and carefully remove all grease from the cup and from
to the control panel; remove the gages.
the interior of the arm.
(3) Remove all grease from the toothed portion
of the governor drive shaft. Use a soft-bristled brush, if
necessary, to remove the grease.