TM
9-879
26
SECOND ECHELON
PREVENTIVE MAINTENANCE
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CAUTION: Loose
primary (front)
drive
chain, with
slack
,'^''*
in excess of V-, inch
total up-and-down motion,
can
cause
excessive noise which sounds like engine knock. Remove
inspection cover for examination of chain.
9
Steering. Observe steering mechanism for indication of
looseness
or
excessive binding through full turning range.
With hands
resting
lightly
on
handle bars
and
vehicle in
vertical position, observe whether there
is
any tendency
to
pull
to one side when operating at
a
reasonable
speed.
Note any
indication of
steering
instability
at
higher speeds.
10
Balance. If vehicle does
not
balance properly
in
operation,
inspect for misalinement
of
rear wheel.
11 Speedomeler
and
Odometer. Inspect speedometer
for
proper operation, excessive fluctuation,
or
unusual noise.
Observe odonneter
for
correct recording
of
trip and
total
mileage.
12 Throttle and Spark Controls. Set throttle
stop
screw and
low speed needle adjustment so
that
engine will operate
smoothly
and will
not stall
at
idling
speed.
With vehicle
running at a speed of 30 miles per hour,
or
faster,
in
high
gear, turn
throttle
control
grip to
"OPEN"
and
"CLOSED"
positions and
note
whether engine responds instantly to
throttle changes. Turn spark control grip and note whether
it
fully
advances
and
retards ignition timer.
13
Power
and Operation.
Observe engine for
normal
pulling
power,
and good operating
characteristics
in each speed,
from first to high gear. Also obsep/e whether engine misses,
stalls, knocks excessively, or makes any other unusual
noise.
14 Carburetor
Adjustment.
No carburetor
adjustment,
other
than
idle adjustment as performed
in item
12, is required
on this vehicle.
15
Brake
Drum and
Hub Temperature. Immediately after
completing road
test,
feel front and rear brake drums and
wheel hubs for overheating.
16
Power
Train Temperatures. Feel transmission
for
over-
heating.
MAIA'TENANCE
OPERATION
17 Compression
Test.
With
throttle wide-open,
test com-
pression
with starter. If engine lacks compression,
inspect
for
leaks.
18
Transmission.
Inspect transmission for
good
condition,
se-
cure
mounting,
and leaks. Inspect oil level.
Drain arid
reftll
49
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