MAINTENANCE

MAKE CERTAIN THE MACHINE IS DISCONNECTED FROM THE POWER SOURCE BEFORE PERFORMING MAINTENANCE PROCEDURES.

1.Periodically clean or vacuum the feed belt.

2.Periodically clean the sawdust from sanding cylinder cavities.

3.Oil all bushings on the feed table rollers and front and rear pressure rollers.

4.Oil thrust bearings on feed table screws [See (T) Fig. 41.]

BRUSH INSPECTION AND REPLACEMENT

CAUTION: BEFORE INSPECTING BRUSHES, DISCONNECT THE MACHINE FROM THE POWER SOURCE.

A

Fig. 42

B

Fig. 43

Brush life varies, depending on the motor load. Check the brushes after the first 50 hours of use for a new machine or periodically after a new set of brushes has been installed.

After the first check, examine the brushes every 10 hours (approximately) until replacement is necessary.

The brush holders (A) Fig. 42, are located on the DC motor housing opposite each other. Fig. 43, illustrates one of the brushes removed for inspection. When the carbon on either brush (B) Fig. 43 is worn to 3/16” or less, or if the spring is burned or damaged, replace both brushes. If the brushes are found serviceable after removal, reinstall them in the same position as removed.

DRUM MOTOR OVERLOAD

PROTECTION

The drum motor is equipped with a re-setable overload relay. If the motor fails to start because of overloading or because of low voltage, turn both switches to “OFF”. Let the motor cool for 3 to 5 minutes, then push the reset button

(A) Fig. 44. Start the machine.

A

FEED BELT MOTOR OVERLOAD PROTECTION

The feed belt motor is equipped with a re-setable overload relay. If the feed belt is tensioned to tightly, the feed belt overload may trip. To correct, loosen the tension on both sides of the feed belt, 1/4 turn at a time on the tensioning set screw on each side of the feed belt. Push the reset button (B) Fig. 45.

Fig. 44

B

Fig. 45

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Dymo 31-250 instruction manual Maintenance, Brush Inspection and Replacement, Drum Motor Overload Protection