SFG10E ELECTRIC SURFACE GRINDER — OPERATION AND PARTS MANUAL — REV. #2 (05/28/09) — PAGE 36
Troubleshooting
ELECTRIC MOTOR
MOTOR FAILS TO START
ON/OFF switch in the OFF position. Turn the switch to the
ON position.
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 available 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.
OPERATIONAL PROBLEMS
UNEVEN MULTI-ACCESSORY ATTACHMENT WEAR
Incorrect installation of the attachment in the aluminum disc.
See INSTALLING A MULTI-ACCESSORY ATTACHMENT
ON THE ROTATING DISC.
Worn or damaged gimbal head Lord® rubber mounts.
Replace mounts.
Accumulation of foreign material on the multi-accessory
attachment. Clean and/or replace the attachment
components as necessary.
Flails and spacer washers are mounted too tight on the
scarifier frame. Remove and/or replace flails and spacer
washers. See MULTI-ACCESSORY ATTACHMENTS AND
APPLICATIONS.
EXCESSIVE JUMPING ON THE WORK SURFACE
Incorrect installation of the attachment in the aluminum
rotating disc. See INSTALLING A MULTI- ACCESSORY
ATTACHMENT ON THE ROTATING DISC.
Worn or damaged gimbal head Lord® rubber mounts.
Replace mounts.
Loose gimbal head fasteners. Retorque fasteners as
required.
ACCELERATED V-BELT WEAR
Misaligned and/or improperly tensioned pulleys. Readjust
pulleys and V-belt. See SERVICE section.
Worn pulleys. Replace pulleys as required. See INSTALLING
A REPLACEMENT V-BELT OR PULLEY.
Improper V-belt. Replace with a name brand B45 series V-
belt. See INSTALLING A REPLACEMENT V-BELT OR
PULLEY.
ACCELERATED BEARING WEAR AND/OR FAILURE
Misaligned and/or improperly tensioned pulleys. Readjust
pulleys and V-belt. See SERVICE section.
Bent transmission input or output shaft. Replace affected
shaft(s).
Improper lubrication. See LUBRICATION REQUIREMENTS.
UNEVEN GRINDING ACTION
Excessive material build-up on the caster wheel face
surface. Remove the material.
Excessive caster wheel bearing wear. Replace the caster
wheel. Excessive axle wear. Replace axle.
Flails and/or spacer washers are mounted too tight on the
scarifier frame. Remove and/or replace flails and spacer
washers. See MULTI ACCESSORY ATTACHMENTS AND
APPLICATIONS.
Mixing new and worn flails, silicon carbide stones, etc.
Remove and replace with components of the same,
approximate size and diameter. See MULTI ACCESSORY
ATTACHMENTS AND APPLICATIONS.
TROUBLESHOOTING
