Maintenance and servicing – Chicago Electric Rotary Hammer 97743 User Manual

Page 13

Page 13

SKU 97743

For technical questions, please call 1-800-444-3353.

MAinTEnAncE And

SERVicing

Procedures not specifically

explained in this manual

must be performed only by a

qualified technician.

TO pREVEnT

SERiOuS injuRY

FROM AccidEnTAl

OpERATiOn:

Turn the power Switch (96) of

the Rotary Hammer to its

“OFF” position and unplug

the tool from its electrical

outlet before performing any

inspection, maintenance, or

cleaning procedures.
TO pREVEnT SERiOuS

injuRY FROM TOOl

FAiluRE:

do not use damaged

equipment. if abnormal noise

or vibration occurs, have the

problem corrected before

further use.

BEFORE EAcH uSE:

Inspect

the general condition of the Rotary

Hammer. Check for loose screws,

misalignment or binding of moving

parts, cracked or broken parts,

damaged electrical wiring, and any

other condition that may affect its

safe operation.
AFTER EVERY 50 HOuRS OF uSE:

Use the Spanner Wrench provided to

unscrew the Grease Cap (18). Add

the Grease provided. Then, replace

and tighten the Grease Cap.

nOTE:

The Rotary Hammer is pre-greased

from the manufacturer. Lubrication is

only needed beginning after about 50

hours of use.

(See Figure A.)

TO cHAngE OR clEAn THE

cARBOn BRuSHES: It may

become necessary at sometime

to replace or clean the two

Carbon Brushes (82) when Motor

performance decreases, or stops

working completely. The Carbon

Brushes are located on each side of

the Motor Housing (78). To change

or clean the Carbon Brushes:

Remove the two Brush Covers

•

(81). Then remove the Carbon

Brushes.
If the Carbon Brushes (82) are worn

•

down more than 1/2, replace both

Brushes.
If the Carbon Brushes (82) are

•

only dirty, they may be cleaned by

rubbing them with a pencil eraser.
When installing the Carbon Brushes

•

(82), make sure the carbon portion

of the Brushes contact the Motor

Armature, and that the springs face

away from the Armature. Also,

make sure the springs operate

freely. After replacing or cleaning,

replace the two Brush Covers (81).
NOTE: New Carbon Brushes (82)

•

tend to arc or spark when first used

until they wear and conform to the

Armature.

(See Figure A.)

AFTER uSE:

Clean external

surfaces of the tool with a clean cloth.
WARning! if the power cord

(112) of this Rotary Hammer is

damaged, it must be replaced only

by a qualified service technician.