Smithco Spray Star 3000 (sn 3500 – Current) Parts & Service Manual - Manual (Page 11)

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Ser
vice
ADJUSTMENTS
(CONTINUED)
DISTRIBUTORLESS IGNITION TIMING
The ignition system does not require any mechanical external adjustments, however the spark plug high tension
leads must be inserted correctly at each number coil position to the corresponding spark plug in the cylinder
(front to rear #1, 2, 3, and 4).
FUEL LEVEL
The fuel level float adjustment is made with the carburetor or air intake body removed. First, turn the fuel shut-
off valve to the OFF position, if so equipped. Remove the carburetor from the engine. Remove the 4 screws that
retain the intake body to the throttle body.
Lift the air intake body off slowly as the accelerator jet assembly is spring loaded and may be
lost.
The float pontoons should be level when the valve is seated. If not, bend the tab carefully to adjust. Reassemble
the carburetor in reverse order of removal. Adjust the carburetor idle speed and idle fuel/air mixture.
SPARK PLUGS
The spark plugs should be replaced at the recommended intervals.
Remove the wires from each spark plug by grasping, twisting and then pulling the molded boot of the wire only.
Do not pull directly on the wire because the wire connection inside the cap may become separated.
After loosening each spark plug one or two turns, clean the area around each spark plug port with compressed
air, then remove the spark plugs.
Set the spark plug gap to specification by bending the ground electrode. All spark plugs new or used should
have the gap checked.
Install the spark plugs and torque each plug to specifications.
Connect the spark plug wires.
Do NOT overtighten spark plugs. The gap may change considerably due to distortion of the
plug outer shell.
PARK BRAKE
There is a clevis on both ends of the Park Brake cable. If the park brake is too loose, turn one or both of the
clevis' clockwise to tighten. If park brake is too tight, turn one or both clevis' counterclockwise to loosen.
SPEED CALIBRATION NUMBERS
The correct speed calibration number for the Spray Star 3000 is 688. This is measured off the front wheel.
Nozzle size MUST be capable of delivering the programmed application rate.
SAFETY INTERLOCK SWITCH
To adjust the interlock switch on the back hydrostatic pump loosen the set screw on the front half of the switch,
with the ignition switch OFF. With a continuity tester connected across the switch, it should light with the shift
arm centered. Move the shift arm to the right or left and the light should go off. By turning the back half of the
switch clockwise it will reduce the amount of travel on the shift arm that is required for the light to remain on. The
light must be on ONLY with the shift arm centered.
GAS THROTTLE
If the gas throttle governor doesn’t stay in the open position you must tighten the tension located underneath the
operator’s panel.