John Deere ET-3504-J User Manual download pdf (Page 13)

1/2-Inch Drill Operator's Manual 13

Maintenance and Inspection

MAINTENANCE AND INSPECTION:

CAUTION: BE SURE TO SWITCH POWER OFF AND DISCONNECT THE

PLUG DURING MAINTENANCE AND INSPECTION.

1. Inspecting the drill bit:

Since use of an abraded drill bit will cause motor malfunctioning and degraded

efficiency, replace the drill bit with a new one or resharpen without delay when

abrasion is noted.

2. Inspecting tightness of various screws:

Periodically inspect screw tightness of individual components. If any screws are

loosened, securely retighten them. Loosened screws, if unheeded, may cause a

hazardous situation.

3. Keeping after use:

When not in use, the Electric Drill should be kept in a dry place out of the reach of

children.

4. Inspecting the carbon brushes:

The motor employs carbon brushes which are consumable parts. When the

brushes are worn down, motor trouble may result. When the brushes are worn

down to the limit line, replace the brushes with new ones. Keep the brushes clean,

so that they smoothly slide into the brush holders.

When replacing the brushes with new ones, be sure to use a pair of brushes for

JOHN DEERE ELECTRIC DRILL ET-3504-J corresponding to the illustrated

number.

Auto-stop carbon brushes automatically cut off the electric circuit, when worn down

to the wear limit. This indicates the replacement time of the brush and prevents

damage of the commutator.

NOTE: Due to JOHN DEERE’s continuing program of research and development, the

specifications herein are subject to change without prior notice.

(Fig. 4)

No. of

a carbon brush

Usual carbon brush 0.24” (6mm) 43

Auto-stop carbon brush 0.28” (7mm) 73

SERVICE AND REPAIRS

All quality tools will eventually require servicing or replacement of parts due to wear from

normal use. These operations should ONLY be performed by a John Deere Dealer.

REPLACEMENT PARTS

When servicing use only identical replacement parts.

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John Deere ET-3504-J User Manual Page 13