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.

TROUBLESHOOTING

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.

ACCELERATEDV-BELTWEAR

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.

SFG10E ELECTRIC SURFACE GRINDER — OPERATION AND PARTS MANUAL — REV. #1 (07/16/07) — PAGE 36

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Stow SFG10E manual Electric Motor, Operational Problems, Acceleratedv-Beltwear, Uneven Grinding Action
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SFG10E specifications

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