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 TM 55-1905-217-34
(e) Support the operating shaft and control housing in an arbor press with the upper end of the
operating shaft resting on a steel block. Aline the flat in the operating fork with the flat on the operating shaft;
then, place a sleeve over the end of the shaft and rest it on the fork. Bring the ram of the press down on the
sleeve and press the fork straight down and tight against the shoulder of the shaft.
(f) Apply a good quality sealant around the periphery of the expansion plug (52), and press the
plug into the lower end of control housing.
(g) Place a lockwasher and flat washer over the retaining screw (11, fig. 3-25). Thread the screw
in the control housing to secure the operating shaft bearing (60).
(h) Place the differential lever (64) over the pivot pin of the operating lever. Install a plain
washer and spring retainer (65).
(3) Governor springs, plungers, and adjusting screw.
(a) Thread the locknut (27, fig. 3-25) on the buffer screw (28) and thread the buffer screw into
the control housing.
(b) Thread the locknut (21) on the high speed spring retainer (20) approximately 1 1/2 inch.
Place the high speed spring (24) over the high speed spring plunger (15) with the tightly wound end of the
spring against the shouder of the plunger.
(c) Insert the plunger and spring assembly in the high speed spring retainer. Thread the idle
screw (23) approximately 1 inch into the tapped end of the plunger. Thread the lock nut (22) over the idle
screw.
(d) Insert the low speed spring (26) in the low speed spring cap (14) and the small end of the
spring seat (25) in the opposite end of the low speed spring.
(e) Insert the low speed spring seat and low speed spring and cap assembly in the high speed
spring plunger (15) with the spring seat (25) against the shoulder of the idle screw (23).
(f) Start the governor high speed spring assembly into the opening of the control housing and
thread the high speed spring retainer (20) in the housing approximately 1 inch.
(g) Installation of the high speed spring retainer cover (17) is not required until after the governor
has been installed on the engine and the tune-up procedures outlined in the Operator and Organizational
Maintenance Manual TM 55-1905217-12 (para 4-30) have been completed.
(4) Governor weight housing.
(a) Install the lock ring (31, fig. 3-25) in the groove of the weight pin (30). Place a flat washer
over the pin and against the lock ring.
(b) Start the pin through the opening in the weight carrier. Place a second washer over the pin
and against the projecting arm of the weight carrier.
(c) Position the governor weight (36, fig. 3-26) between the projecting arms of the weight carrier.
Push the pin through the governor weight.
(d) Place the third flat washer over the pin and against the weight.
(e) Then, push the pin completely through the weight carrier and place the fourth flat washer
over the pin and against the projecting arm of the weight carrier. Install a second lock ring in the groove of the
weight carrier pin.
(f) Install the second governor weight in a similar manner.
h. Installation. Refer to Operator and Organizational Maintenance Manual TM 55-1905-217-12 (para 4-
30).
3-5. Expansion Tank (Fresh Water)
a. Inspection. Inspect the tubes, hoses, connections, and expansion tank for leaks and deterioration.
b. Removal.
(1) Loosen clamps and disconnect lines from! expansion tank (Refer to fig 3-27).
(2) Disconnect tubing and remove expansion tank.
3-34
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