Suction and Discharge Gages, Lines, and Fittings

(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.

b. Removal.

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

reassembly.

parts.

(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

WARNING

4-28.

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.

Wash

tachometer shaft to the governor arm, and lubricate the

exposed skin thoroughly.

Dry

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

dangerous

personnel

and

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 138F (38 to

Fittings

59C).

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.

4-50