TM 5-3810-300-24&P-3
14.3.2 LIMITING SPEED GOVERNOR ADJUSTMENT (DUEL RANGE)
h Start the engine and place the speed control Pag
lever in the maximum speed position and apply
air pressure to the governor.
NOTE: To overcome the tension of the
governor high speed spring, 50 psi air
pressure will be required in the governor
spring housing.
i. Back out the low maximum speed adjustment
screw 1/4". If the piston is adjusted correctly, the
engine will operate at the recommended high
maximum no-load speed.
j. Remove the air pressure from the governor.
k. Make minor adjustment on the piston and sleeve
if necessary to establish the exact speed
desired.
Figure 5 - Former Dual Range Governor
1
Disconnect any linkage attached to the governor
speed control lever.
b. Loosen the lock nut and turn the low maximum
speed adjusting screw in until the desired no-
2
Set the low maximum no-load engine speed,
load high maximum speed is obtained.
a Adjust the low maximum speed adjusting screw,
c. Stop the engine and remove the spring housing.
with the engine speed control lever in the
Note the distance the sleeve extends beyond the
maximum speed position, until the desired low
spring housing.
maximum speed is obtained. Turn the screw in
to increase or out to decrease engine speed.
CAUTION: Do not permit the seal ring
on the piston to slide past the air inlet
b. Tighten the lock nut and recheck the engine
port, since the seal ring will be
speed.
damaged.
maximum engine speeds. Make any adjustment that is
d. Remove the piston and sleeve from the bottom
necessary as outlined in Steps 1 and 2.
of the spring housing.
Engines with Current Dual Range Limiting Speed
e. Turn the piston until the sleeve extends from the
Mechanical Governor After positioning the injector rack
bottom of the piston the same distance the
control levers, set the maximum engine speeds.
sleeve extends beyond the spring housing, Step
c.
NOTE: Be sure the buffer screw projects 5/8" from the
f. Check the adjustment by installing the piston
maximum no-load speeds.
and sleeve in the spring housing. The piston
should be flush to 1/64" below the bottom of the
With the spring housing assembly mounted on the
spring housing when it is tight against the
governor, the piston and sleeve assembled with four
adjustment screw.
.100" shims and ten .010" shims as illustrated in Fig. 6,
and the low maximum speed screw extending from the
NOTE: The cover, cover gasket and
spring housing approximately 1-1/4", proceed as follows:
spring housing must be held as an
CAUTION
assembly when checking the piston
: Do not apply air pressure to governor until performing
position g. Replace the piston and
Step if.
sleeve in the governor spring housing
and assemble to the governor.
Page 397
TM 5-3810-300-24&P-3