JLG 80HX_HX+6_HXER ANSI Service Manual User Manual
Page 55
SECTION 3 - CHASSIS & TURNTABLE
3120271
– JLG Lift –
3-17
3.6
GOVERNOR CHECKS AND ADECO
ADJUSTMENT, LRG423 & LRG425
Checks
(Refer to Figure 3-7.)
1.
Check the governor drive belt tension. A belt in
operation for 10 minutes or more should be set at
100 ft. lbs. (135 Nm).
2.
Check the length of the spring spreader adjustment
from the centerline of the eye to the centerline of the
eye. This dimension should be 1 5/8 inch.
3.
Manually move the governor throttle lever to the
maximum high speed position. (The Adeco actuator
must be disconnected to accomplish this.) The car-
buretor throttle lever should have 1/32 to 1/16 inch
travel remaining to the stop. The governor high
speed stop screw was removed at the factory.
NOTE: All governor adjustments must be made with Adeco
throttle actuator disconnected.
Adjustments
See Figure 3-7. and Figure 3-8.
1.
With the throttle rod and Adeco actuator discon-
nected from the governor, advance the governor
arm to the high speed position. This should advance
the governor throttle lever to the maximum wide
open position. Verify the wide open position of the
lever by checking the governor spring for tension.
Reconnect the throttle rod.
2.
From the ground control, start the engine. Allow the
engine to come up to normal operating temperature.
Advance the governor arm to the wide open posi-
tion. Set the high engine speed at 3000 RPM (2500
RPM for machines with piston pump) by making
adjustments at the throttle rod. Return the 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 the speed slowly to 2925
RPM (2425 RPM for machines with piston pump).
Slowly turn the governor surge screw clockwise until
the no load engine speed increases to 3000 RPM
(2500 RPM for machines with piston pump). Lock
the surge screw in position. Shut off the engine.
NOTE: Do not turn the surge screw in any further than nec-
essary or governor performance will be affected.
Figure 3-7. Governor Adjustment, LRG-423 & LRG-425 with Adeco