Check And Adjust The Air/Lpg Mixture - Ford Models - Genie S-40 Service Manual

January 2005
REV A
D-5
Check and Adjust the Air/LPG
Mixture - Ford Models
Maintaining the proper air-to-fuel mixture during
LPG operation is essential to good engine
performance.
Explosion and fire hazard. Engine
fuels are combustible. Perform this
procedure in an open, well-
ventilated area away from heaters,
sparks, flames and lighted
tobacco. Always have an approved
fire extinguisher within easy reach.
The engine should be warmed to
normal operating temperature
before performing this procedure.
1 Move the fuel select toggle switch to LPG fuel
and start the engine from the ground controls.
2 Locate the high idle mixture adjustment
screw on the LPG venturi that attaches to the
air cleaner air cleaner hose.
3 Loosen the lock nut on the high idle mixture
adjustment screw.
4 Load the system by activating the primary boom
retract function, then move the function enable
toggle switch to the high idle (rabbit symbol)
position.
Part No. 102521
Section 3 • Scheduled Maintenance Procedures
5 Adjust the high idle adjustment screw to obtain
an air-to-fuel mixture ratio of 13.0:1 to 13.2:1,
using an exhaust gas analyzer.
6 Hold the adjustment screw and tighten the
lock nut.
7 Return the function enable toggle switch to the
center position.
8 Locate the low idle mixture adjustment screw on
the LPG regulator.
9 Adjust the low idle mixture adjustment screw to
obtain an air-to-fuel mixture ratio of 13.0:1 to
13.2:1.
Genie S-40 and Genie S-45
CHECKLIST D PROCEDURES
1
Preliminary setting is
6.4 mm of threads showing.
Measure from top of lock nut to top
of adjustment screw.
If an exhaust gas analyzer is not
available, adjust to obtain peak or
optimum rpm.
Preliminary setting: turn low idle
adjustment screw clockwise all the
way in. Turn low idle adjustment
screw counterclockwise 2
turns.
/ inch /
4
3
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4
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