TM
9-879
20
MOTORCYCLE,
SOLO (HARLEY- DAVIDSON
MODEL WLA)
bearing
outer grease
retainer
is loose
(par.
92).
Generator drive
end
bearing
requires no
attention, since it
is
lubricated
by oil circulating
through engine.
(4)
Spark and
Throttle
Control Grips.
These grips require
disassembly.
Twice a
year,
or
whenever
grips do
not turn freely, indi-
cating
need of
lubrication,
remove grips,, clean
psrts, apply grease,
and
reassemble (par.
101).
(5)
Air Cleaner. Examine
oil
cup daily
for
excessive
dirt and
correct
oil
level.
Under extremely dusty or sandy
conditions it may
be necessary
to
clean and refill the air cleaner more than
once daily.
Refill oil cup to indicated level with engine oil-
Drain, clean,
and
refill
oil cup every 250 miles, depending upon
operating conditions.
Every 1,000 miles (oftener if necessary), remove
air cleaner
filter
units, wash
in dry-cleaning solvent,
lubricate, and reassemble (par.
76). NOTE: Early type round cleaner
did
not
have removable Slter
element. Complete
cleaner must be removed to wash
element:
(6)
Wheel Bearings.
When wheel hubs are
lubricated at regular
500-mile interval,
^
ounce of grease
with
each
greasing is sufficient.
This
amounts
to about
15 shots of the standard
1-pound
air gun, or
four
strokes with a
1
-pound, hand-operated
gun.
If vehicle has been
operated in water, wheel hubs
submerged, apply
hub greasing service
immediately
afterward
(or
soon as situation permits).
Do
not
over-
lubricate
wheel hub bearings, as excess grease
may
work
into brake
linings,
reducing brake
efficiency.
When using
air-operated
grease
gun, it is
easy to
overlubricate
wheel hub bearings,
(7)
Steering
Head
Bearings.
Every
50,000
miles, repack
upper
and lower
bearings, or whenever there
is
occasion to remove rigid
fork
for repair or replacement
(par.
98).
(8)
Tank,
Engine Oil. Oil tank
is located
on
right side of
motor-
cycle.
Empty tank holds
1
U. S. gallon.
Check
daily and add engine
oil
as necessary
to refill
tank within
1 inch
of top.
Oil level gage rod
(dip
stick) is located directly
below tank cap. When oil
level
is down
to
"REFILL"
mark on gage rod.
2 U. S. quarts may
be added. Drain
oil
tank every
1,000 miles and refill with fresh engine oil. Drain plug
located
on underside
of
tank in forward
position. In
extremely
dusty
service,
and
in
winter
weather,
change oil oftener.
(a) Winter
Caution. Water is
a by-product of
combustion
in any
internal
combustion
engine. In a condensed
state, the
water vapor
formed
would
equal approximately
the quantity
of gasoline burned.
Some
of
this water vapor escapes
past
the
rings into the crankcase.
When
starting
and warming up in
cold weather,
considerable
vapor
getting
into
crankcase condenses
to water before crankcase
is hot
enough
to exhaust
the vapor, without
inside
condensation,
through
outside
breather.
If
engine is
driven
enough to get
crankcase
thor-
oughly
warmed
up frequently,
most of this
water is
again vaporized
32
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