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DFG-SERIES SURFACE GRINDERS OPERATION AND PARTS MANUAL REV #4 (05/28/09) PAGE 47
TROUBLESHOOTING
Troubleshooting
ELECTRIC MOTOR.
Application: DFG/E Series SURFACE GRINDER.
MOTOR FAILS TO START
ON/OFF switch in the OFF position. Turn the switch
to the ON position.
Improper voltage selection. Determine the available
voltage value from the power source. Move the
voltage selection switch located on the motor to the
proper selection.
SURFACE GRINDER and/or extension cord is not
plugged into the power source. Determine that all
electrical connections have been properly made.
The NEMA 6-20 Series cap and receptacle set is of
a twist lock configuration and requires a twist motion
to ensure a proper connection.
Improper extension cord size and capacity. Operate
the SURFACE GRINDER with copper stranded, 8
AWG or larger extension cords. Improper extension
cord size and capacity will result in significant heat
rise and corresponding voltage and amperage drop.
Thermal protection device
activated. To protect the
motor against heat related damage, an automatic
thermal protection switch is provided near the
voltage selection switch. High operating
temperatures will activate the switch and shut the
motor off. After the motor has cooled to an
acceptable temperature level,depress the switch to
restart.
ELECTRIC MOTOR LOSES POWER
Improper extension cord size and capacity. Replace
with cords meeting the required specifications.
Excessive extension cord length. Even with proper
extension cord size and capacity, excessive cord
length can reduce the available voltage and
amperage to the motor. Measure the avail
able
voltage to the motor where the extension cord
connects to the SURFACE GRINDER with a
voltmeter. Reduce the extension cored length as
required to achieve the minimum voltage operating
specification as required by the motor manufacturer.
Insufficient available voltage and amperage at the
power source. Measure the available voltage at the
power source (usually a receptacle) with a voltmeter.
If the available voltage is below the minimum
operating specification as required by the motor
manufacturer, utilize an alternative power source.
Improper motor cooling. See ELECTRIC MOTOR
SERVICE.
Excessive load to the motor. See OPERATING THE
SURFACE GRINDER ON THE JOBSITE.
ENGINE.
Application: DFG/G Series SURFACE
GRINDERS.
ENGINE FAILS TO START
Ignition switch in OFF or cut off position. Place
switch in the ON position or move throttle control
lever to the ignition operational position.
Incorrect carburetor/fuel ignition system adjustment.
See SERVICE section.
Air filter blocked. See SERVICE section.
Ignition wire to spark plug loose or disconnected.
Reconnect.
Application: DFG/G Series SURFACE GRINDER.
Fuel supply exhausted. Refill the fuel tank.
Spark plug fouled. Replace Spark Plug. Refill the
fuel tank.
ENGINE LOSES POWER
Incorrect carburetor/fuel injection adjustment. See
SERVICE section.
Excessive carbon accumulation in combustion
chamber. See SERVICE section.
Excessive material build-up around the cooling fins.
See SERVICE section.
Application: DFG/G Series SURFACE GRINDER.
Water in fuel supply. Drain and replace fuel.
Fuel tank breather vent closed (if so equipped).
Open vent.
Air filter blocked. See SERVICE section.