Perkins 103-06 Workshop Manual page 53

H. Reassembly should be made in the reverse order of
disassembling after inspecting as described in the
paragraph of "Inspection
assembling, check thrust gap for armature is 0.5mm
maximum and then check and adjust the dimension,
[.
Check and adjust the dimension, c
The distance for which the pinion is pushed out by
the magnetic switch is called the dimension c
Measure the dimension [before installing the
motor.
a. Connect the (+) and (-) terminals of the battery
to the S terminal of the magnetic switch.
NOTE: Use a 12V battery. Never short circuit (
contact) (+) and (-).
b. The pinion is inserted up to the pinion stopper.
c. As shown in PB114, push the pinion to the
arrow direction by finger so that there is no play
and measure the dimension i. i = 0.2-1.5mm (
1.2kw motor) and 0.5 to 2.0mm on 0.7kw motor.
Loosen the adjusting nut and adjust by the
adjusting screw, or shims where fitted.
Pinion
\ Stop ring
PINION CLEARANCE
d. Check operation of magnetic switch and change
adjusting plate if necessary.
Inspection and Service A.
PB112
and service". After
F r o n t /
bracket
PB114
Armature
a. Short-circuit test of the coil
Use a growler tester for the test.
Place the armature core in a growler tester and,
applying an iron piece, turn the armature.
Vibration of the iron piece indicates short-circuit.
Then replace the armature.
b. Check the insulation between commutator and
shaft. If continuity is indicated, it shows poor
insulation. Then replace
measurement with a circuit tester is impossible.
Be sure to use a 500 V megger for checking. If
the test result is more than 1 Mil, it is
acceptable.
c. Inspection of the surface of commutator
The part of the commutator surface where
the brush is sliding in contact can be distin-
guished clearly. If the sliding area is rough,
grind with sand paper of No. 500 or 600. If the
indication of a dial gauge exceeds 0.5mm (.002")
, correct with a lathe.
d. Insulator of the commutator
Measure the depth of the insulator of the
commutator, and correct as indicated in
PG144 if the result is 0.2mm (.008") or less.
U n a c c e p t a b l e
e. Shaft bend
Measure the bend of the shaft with a dial
gauge. Holding the center of the armature
shaft ends, measure the run-out of the center
bearing metal. Turn the armature quietly and
read the value indicated by the dial gauge
pointer. Real bend is
1
Allowable bend limit: 0.08mm (.003")
B. Field Coil
a. Check the field coil for disconnection using a
tester. Inspect the continuity between terminals
connected with a brush of the field coil. If no
continuity is indicated on the tester, it shows
disconnection. Then replace the field coil with
new one.
the coil. Proper
C h a m f e r e d 0 , 5 t o ,
8 m m
Acceptable
PG144
of the reading.
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