MCi Crusader II 1989 Maintenance Manual page 303

Date
1-1-89
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MC-9 MAINTENANCE MANUAL
5. Return the speed control lever to the low speed setting
and turn the engine off.
6. Connect the air line previously removed from the gover-
nor spring housing.
7. Start the engine and place the speed control lever in the
maximum position. Check and record the engine rpm (maxi-
mum no-load high engine speed - recommended to be 2250
rpm). Turn the engine off. ··
8. Determine the shims required for the 2250 high maximum
no-load engine speed. Each 0.010-inch shim added to or taken
from the shim pack will respectively increase or decrease
engine rpm 10 rpm. Shims 0.100-inch thick change engine
speed approximately 100 rpm.
NOTE: The shim pack is inside the two
speed governor. ODA part number of the
0.010-inch shim is 5123922. The 0.100-inch
shim's part number is 5123923.
9. Disconnect the air line to the governor spring housing.
Cut and remove the lock wire that is routed through the mount-
ing capscrews an the low maximum no-load adjusting screw.
CAUTION: ~hen removing the two speed
governor, use care not to damage the gov•
ernor mounting gaskets. Also, keep the
internal parts within the housing during
removal.
10. Remove the two capscrews mounting the housing to the
governor and remove the housing. Refer to figure 8-8.
11. Place the housing on a clean work surface and separate
the retainer and sleeve from the piston. The snim pack is
located inside the piston. between the piston and the sleeve.
12. Add to the shim pack (or take from it) the number of shims
necessary for a high maximum no-load speed of 2250 rpm.
Reassemble the shims. sleeve. retainer and piston in the
housing.
13. Install the housing with the gaskets on the governor and
conn~ct the air line.
14. Place the main battery switch in the ON position.
15. Start the engine and allow it to reach normal operating
temperature.
16. Place the speed control lever in the high speed position
and check for the recommended high maximum no-load speed
(2250 rpm) with the tachometeer. If the speed is too high or too
low. repeat steps 7 thru 16 to add or take out shims ..
17. Place the speed control lever in the low position and turn
off the engine.
18. Disconnect the air line to the governor spring housing
and start the engine.
19. Place the speed control lever in the high speed position
and check the low maximum no-load speed with the tachome-
ter. Adjust the low maximum no-load speed adjusting screw (on
the governor spring housing) for 1850 rpm or the engine speed
that was recorded in step 4.
20. Reconnec~ the air line to the housing and install the
tocking wire.
NOTE: Major changes in the shim pack
thickness may change the settings of the
governor gap, injector rack control levers,
idle speed and buffer screw. Refer to sec•
tion 14 of the applicable DOA engine man-
ual to adjust the above items.
21. Adjust idle speed screw (figure 8-9) until the engine rpm
is approximately 15 rpm below recommended idle speed (650
rpm with automatic transmission: 500 rpm with manual trans-
mission).
NOTE: Use of the fast idle cylinder may be
required to eliminate engine roll. After idle
speed is established, back out the cylinder
to the previous setting of 5
/a"
(15.88 mm).
22. Hold the idle screw and tighten the lock nut (figure 8-9).
23. Install the high speed spring retarner and tighten to two
bolts (figure 8-8).
24. Turn the fast rdle cylinder inward so it contacts the differ-
entral lever as lightly as possible whrle still eliminating engrne
roll.
NOTE: Do not increase engine idle speed
more than 15 rpm with fast idle cylinder.
HOUSING
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S L E E V ~ ~ E ~
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(.t:~~~GER PISTON GUIDE SET SCREW
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/ ~ R E T A I N E R
LOW SPEED SPRING ADJUSTING PIN LOCK .. UT
HIGH Sl'EED Sl'RING ,.
Figure 8-8. Governor Parts Breakdown.