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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.