JLG 80HX_HX+6_HXER ANSI Service Manual - Manual (Page 69)

SECTION 3 - CHASSIS & TURNTABLE
3120271 – JLG Lift – 3-31
(3.) Governor not tuned or adjusted for engine/applica-
tion.
The basic adjustment to set sensitivity/stability is the Gain
pot. A good starting point for many engines is full CCW,
then CW 1/3 turn. (See “Governor adjustment” section).
To increase stability, turn CCW. If satisfactory governing
cannot be achieved with this one adjustment, the factory
adjustment may be needed. Normal starting point for this
adjustment is fully CCW, then CW 1/4 turn. (Before chang-
ing this pot, mark the original position).
NOTE: If problems occurs with the Governor overshooting
when a large load is released from the engine, such
as driving up a hill and stopping. There is usually
one of two things:
a. Gain adjustment is to far CCW.
Mechanical preload between the carburetor and actuator
is to large, this should be no greater than 1/2 to 1 ball dia.
(Ref. to page 43 par. 1).
Automatic Choke Adjustment Procedure
(For all JLG 1.IL and 2.3L Ford carbureted engines)
1. At 70°F the choke plate should be open 1/3” (not
touching the choke bore).
2. If the ambient temperature is not 7o°F, an additional
adjustment is required:
a. Loosen the three cover plate screws.
b. Adjust the cover to open the choke plate 1/32”.
c. Readjust for ambient temperature by rotating the
cover one (1) mark per 5°F from 70°. Rotate
CCW (lean) if warmer than 70°, CW (rich) if
colder than 70°.
(If actual temperature is 80°, set at 1/32” and
rotate two (2) marks CCW (lean) direction.)
Tighten the three cover plate screws and check for free
rotation (no sticking or binding) of the choke shaft.
3.9 AUTOMATIC CHOKE ADJUSTMENT -
FORD ENGINE
1. At 70°F the choke plate should be open 1/32" (not
touching the choke bore).
2. If the ambient temperature is not 70°F, an additional
adjustment is required.
a. Loosen the three cover plate screws.
b. Adjust the cover to open the choke plate 1/32".
c. Readjust for ambient temperature by rotating the
cover one (1) mark per 5°F from 70°F. Rotate
CCW (lean) if warmer than 70°, CW (rich) if
colder than 70°. (If actual temperature is 80°, set
at 1/32" and rotate two (2) marks CCW [lean]
direction.)
d. Tighten the three cover plate screws and check
for free rotation (no sticking or binding) of the
choke shaft.
1/32"
MARK