JLG 40H Service Manual - Manual (Page 40)

SECTION 2 - PROCEDURES
2-20
– JLG Lift – 3120240
2.14 GOVERNOR CHECKS AND ADDCO
ADJUSTMENT, FORD.
Checks. (Refer to Figure 2-4)
1. Check governor drive belt tension. A belt in opera-
tion for 10 minutes or more should be set at 100 ft.
lbs. (135 Nm).
2. Check length of spring spreader adjustment from
centerline of eye to centerline of eye. Dimension
should be 1 5/8 inch.
3. Manually move the governor throttle lever to maxi-
mum high speed position. (The Addco actuator
must be disconnected to accomplish this.) The car-
buretor throttle lever should have 1/32 to 1/16 inch
travel remaining to stop. The governor high speed
stop screw was removed at the factory.
NOTE: All governor adjustments must be made with Addco
throttle actuator disconnected.
Adjustments. (Refer to Figure 2-5, 2-6, and
2-7)
1. With the throttle rod and Addco actuator discon-
nected from governor, advance governor arm to
high speed position. This should advance governor
throttle lever to maximum wide open position. Verify
wide open position of lever by checking governor
spring for tension. Reconnect throttle rod.
2. From ground control, start engine. Allow engine to
come up to normal operating temperature. Advance
governor arm to wide open position. Set high engine
speed at 2400 RPM by making adjustments at throt-
tle rod. Return engine to low speed.
3. If the engine hunts or surges in the maximum speed
no load condition, decrease engine speed until
surging stops. Increase speed slowly to 2325 RPM.
Slowly turn governor surge screw clockwise until no
load engine speed increases to 2400 RPM. Lock
surge screw in position. Shut off engine.
NOTE: Do not turn surge screw in any further than neces-
sary or governor performance will be affected.
4. From basket (for idle) start engine and allow engine
to come up to operating temperature. Set idle speed
at 1000 RPM using idle adjustment screw on carbu-
retor. Shut off engine.
5. Remove cover on Addco actuator. With no function
activated, actuator should be fully extended. Hold
governor arm in idle position. Adjust slide pin (1) to
contact idle limit switch at output rod end of actua-
tor. Adjust actuator rod until you can hook up to gov-
ernor arm.
6. With the aid of an assistant, start engine from basket
and allow to come to operating temperature. Dis-
connect proportional dump valve wire. Activate foot-
switch. Turn high engine switch on. Hold drive
controller in full drive position. Adjust slide pin (2) to
contact high engine limit switch at 2400 RPM. Shut
off all switches and controllers. Reconnect propor-
tional dump valve wire.
Figure 2-4. Governor Adjustment, Ford with Addco.