JLG 80HX_HX+6_HXER ANSI Service Manual - Manual (Page 61)

SECTION 3 - CHASSIS & TURNTABLE
3120271 – JLG Lift – 3-23
6. If engine surging occurs at this point, turn the “gain”
(P2) adjusting screw CCW until surging ceases. Turn
the “high engine” (P1) adjusting screw until the
engine runs at 3000 RPM (2500 RPM for machines
with piston pump). Turning the screw CW increases
RPM. Turning the screw CCW decreases RPM.
7. While the assistant continues to depress the foot-
switch, have the assistant place the engine speed
switch to LOW ENGINE. Turn the “low (mid) engine”
adjusting screw until the engine runs at 1800 RPM.
Turning the screw CW increases RPM. Turning the
screw CCW decreases RPM. Shut down the engine.
Seal all trim pots when finished with finger nail polish
or an equivalent sealer.
NOTE: If the engine surges under no load, on HIGH ENGINE
and you cannot get enough response from adjusting
“gain” (P2), try adjusting the surge screw on the
actuator. Loosen the surge screw locknut. Discon-
nect the throttle linkage. Turn the surge screw CW
until linkage arm moves. Manually stroke the linkage
fully and allow it to return slowly until it stops. Try to
move the linkage towards the return position. If the
linkage moves, turn the surge screw CCW 1/2 turn.
Again stroke the linkage and allow it to return slowly
until it stops. Try to move the linkage towards the
return position. If the linkage moves, turn the surge
screw CCW 1/2 turn. Repeat this procedure until the
linkage does not move after stroking. Do not turn any
more. This will set the buffer spring tension properly.
Reconnect the throttle linkage.
8. With the engine speed switch set to LOW ENGINE,
when the footswitch is depressed the engine should
immediately respond. If response time lags, turn the
“gain” (P2) adjusting screw CW to improve
response time. Turn the adjusting screw in small
increments only until response time is correct. Turn-
ing the adjusting screw too far CW can cause surg-
ing (see step 7 above).
3.8 E331 PRECISION GOVERNOR AND
ADJUSTMENTS - FORD ENGINES
General
These instructions presume no electrical test equipment
other than a multimeter for making the electrical measure-
ments called for on the following pages. If no suitable
meter is available, an inexpensive but adequate meter,
part number 22-188 is available from any local Radio
Shack store.
Many "governor problems" are due to installation prob-
lems, particularly in first time applications. Careful atten-
tion to the directions provided will result in a successful
installation made in the least amount of time.
Quick-start Installations
If you are experienced in installing and adjusting Electric
Governor, follow these steps. Otherwise refer to the more
detailed instructions starting with "Mounting-Actuator".
1. Mount Actuator rigidly to engine location which will
permit a short, straight linkage to the carburetor or
fuel valve. Avoid very hot areas.
2. Mount controller in a dry, fairly cool location. Acces-
sibility for adjusting is required
3. Wire per appropriate included schematic, using #16
wire.
4. Set up fuel linkage. This is critical, so review the sec-
tion titled "LINKAGE".
5. Hold linkage for safety, and start the engine.
6. Adjust engine speed to desired valve using High
Engine pot. (See E-331 Electronics - Adjustment
Locations.)