Service Manual

SERVICE INSTRUCTIONS
2.1 REPLACE MOTOR (figs. 2.1 la, 2.1lb)
When replacing the motor
it is necessary
to remove the automatic line feed assem-
bly. Refer to section 1 for head disassem-
bly.
To remove the wire connectors, use
wire cutters and nip the connector in the
center of the factory crimp; pull the wires
out. Remove the roll pin by rigidly sup-
porting the armature shaft (to prevent
bending) and driving the roll pin out.
Figure 2.11a
Figure 2.1 1 b
2.2 SPIN MOTOR BY HAND
Spin the motor with your hand and notice
the feel of the armature;
it should turn
freely. Visually check for excessive
commutator wear, armature end-play and
bearing to shaft fit. A binding or scraping
sound when the motor
is turned could be
evidence of
a bad bearing or a deformed
drum.
2.21 CHECK DRUM (fig. 2.21)
A deformed drum means that plastic de-
formation has occurred to the drum
at the
motor shaft. The drum may have slipped
up the motor shaft. A
tell-tale sign would
be the spool not located inside the drum
correctly. A deformed drum must be
replaced.
Deformed Correct
2.22
Figure 2.21
REPLACE DRUM (fig.2.22)
SERIAL NOS. 800001 - 899999.
A
retaining ring is used to secure the drum.
After removing the spool, driver, core and
spring
as described in section 1, pry out
the ring and slide the spool off the shaft.
Install with 1979 parts.
Figure 2.22
SERIAL NOS. 900101 and UP.
CYA
After removing the spool, driver, core and
spring, the drum will slide off the motor
shaft. Install the new drum and reassemble.
2.23 BAD BEARING - REPLACE MOTOR OR
TRIMMER
(fig. 2.23)
To pin-point
a defective motor bearing,
inspect for
a burned or charred shaft at the
bearing. Carefully watch the bearing.
It
should not spin in its casing. Lubricate
the bearing while turning the motor;
a
drop or two of 30 wt. oil may be all that
is needed to free-up the motor. If the bear-
ing
is at fault, replace the motor as per
section 2.1
1 or, replace the trimmer if in
warranty.
Figure 2.23
8