remove scored marks or roughness on armature shaft or spindle sleeves with an
oil stone, and if parts are worn badly replace with new. (NOTE: If armature
hearings (45 and 135) are worn or require replacement for any reason, return
motor to factory for service. The armature bearings in model 3 motor are oil-
less type and must not be reamed.) Reassemble motor according to Sections B-1
to B-l2.
C-4. If when tested according to Section C-1, the test lamp indicates that circuit
is not continuous through prongs of plug when switch knob is set at 10, there
is either an open field coil, broken connection, or poor contact somewhere in
the circuit. Possibly the switch contact (105) is not good due to switch pin
(125) being short. Remove rear motor cover (128) according to Sections A-1 and
A-2 and press down against switch lever (105) with a piece of wood, so as to
make contact. If motor starts, this indicates that switch pin (125) is short.
Either replace switch pin, or bend up bronze switch lever in the middle and
down at the contact end slightly.
C-5. If motor
does not run when switch lever (105) is pressed down, as described in
Section C-4, check for continuity of circuit through governor breaker contact
points with test lamp, by placing one test wire on governor diaphragm (138)
and the other wire on switch
contact point under the switch contact on the end
of switch
lever (105). If test lamp fails to light to full brilliance, an open
circuit must exist between governor
contact points. Clean the governor
contacts and burnish them as instructed in J-2a.
D. Motor Does Not Operate on Low Speeds, and Runs Slow and Very Jerky When It
Does Begin To Run On Higher Speeds.
D-l. Speed is set incorrectly. Reset according to Section B-11.
E. Governor Does Not Control On Low Speed Except Under Load
E-l. This is probably due to the frictional load of the motor being so light that
the small current flowing through the resistor (43) is sufficient to maintain
a motor speed above that for which the governor is set. A centrifugal brake
(27A) has been included in model 3 motor to apply an additional load at low
speed to prevent this. Should this occur, however, it can be remedied by
taking motor apart according to Sections A-1 to A-7, removing armature and
slightly bending blades of centrifugal brake towards each other.
F. NOISE
F-1. When motor is noisy at high speed only, replace speed adjustment switch knob
(70) with later type having smaller cam rise that regulates top whipper speed
at 1000 R.P.M. (When ordering replacement switch knobs, ask for part IIX.)
F-2. When motor
is noisy on all speeds, armature thrust adjustment cap (107) may be
worn or baffle plate retaining screws (23) may be loose. Take motor apart
according to Sections A-1 to A-3 and remove thrust cap with 3/4 in. wrench,
after first loosening thrust cap lock nut (106). If worn, replace with new
thrust cap. Adjust new thrust cap as instructed in Section B-8.
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