TM 53810-300-24&P-3
14.3.3 Variable Low-Speed Governor
in Fig. 3. This gap setting range is required because of
Adjust Maximum No-Load Engine Speed
the lighter low-speed weights and heavier highspeed
weights.
Adjust the maximum no-load engine speed as outlined
for the limiting speed mechanical governor in Section
CAUTION:
Do
not
overspeed
the
engine.
Adjust Idle Speed
6
With the engine operating between 900 and 1050
rpm, set the gap between the low-speed spring cap
Adjust the normal highway idle speed as follows:
and the high-speed spring plunger (Fig
at
.0015" by adjusting the gap adjusting screw in the
1
With the engine running at normal operating
operating shaft lever
If the setting is correct,
temperature and with the buffer screw backed Qut
the .0015" movement can be seen by placing a
to avoid contact with the differential lever, hold the
drop of oil into the governor gap and pressing a
lock nut and loosen the variable low-speed
screw driver against the gap adjusting screw
adjusting shaft retainer
Adjust the retainer and
Movement of the cap toward the plunger will
shaft assembly to obtain a minimum of 550 rpm idle
force the oil from the gap in the form of a small
speed (current single-weight governor) or 450 rpm
bead.
(former doubleweight governor).
7
Hold the gap adjusting screw and tighten the lock
NOTE: It may be necessary to use the
nut.
buffer screw to eliminate engine roll.
Back out the buffer screw, after the idle
8
Re-install the governor cover and lever assembly.
speed is established, to the previous
setting (5/8").
Position Injector Rack Control Levers
Adjust Buffer Screw
Position the injector rack control levers as outlined in
Section 14.3.
Adjust the buffer screw as outlined in Section 14.3.
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