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Begin by locating the auto prime adjustment wheel. It protrudes from the secondary regulator
mounted on the generator and is often covered by a red vinyl cap. The adjustment knob is
orange and just below the knob is a gold colored washer. To adjust, hold the washer and rotate
the orange knob counterclockwise to lean the adjustment. Try this adjustment hot and cold.
In all multi-cylinder engines, the device may be disabled in lieu of adjustment.
Main Mixture
The main mixture is located on the secondary regulator and is a very large brass screw and lock
nut.
Begin by loosening the lock nut and counting the turns until the screw just seats. Record this
number so that you may return to it later. REMEMBER, the generator DID run previously either
at the factory or at the site.
Proceed by disconnecting the generator set’s Auto Prime (if so equipped) by unplugging the
terminal on the orange wire.
Check that all fuel supply lines are turned on (where applicable).
Check that he generator’s main line output breaker is turned OFF (where applicable).
The next step is to start the generator. Voltage will be available at
the output terminals and anywhere the generator is connected.
Think ahead and warn others of your intentions.
Operate the generator with the operation switch in the “Manual-Run” mode. The engine should
begin cranking.
While the engine is cranking, turn the main adjustment screw counterclockwise until the engine
starts. Continue to rotate back and forth until smooth operation is obtained. [ Adjustments that
are too rich (too far counterclockwise) or too lean (too far clockwise) will result in the same
rough sound. Use slow, rotating motion to find the smoothest spot.]
Once set, energize the AC breaker and apply available load.
Readjust main mixture screw until generator (with or without
applied load) is smooth. This will most likely be a slight rotation
richer than initial setting at no load.
Shut off engine by placing the Operation Switch into the “OFF” position.
If operation problems persist, contact your dealer or call Baldor Generators for Technical
Support at (920) 236-4200.