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Lawn-Boy M Series User Manual

Lawn-Boy M Series
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The flow rate of the oil pump is very low. For this
reason
it
is difficult to detect oil movement in the
lines.
Lawn-Boy 2-CYCLE ASHLESS OIL is dyed
blue for visibility in mixed fuel and oil lines.
Service replacement oil pumps come prefilled
with undyed (clear) or red dyed
2
cycle oil.
On initial start-up, after servicing, run engine
with
64:i
fuel/oil pre-mix in fuel tank.
Observe oil flow at fitting in bottom of oil reser-
voir. Color of oil in line must change to blue
(dyed) Lawn-Boy 2-CYCLE ASHLESS OIL
confirming proper operation.
If
no oil flow is observed, check for:
Oil
reservoir full
Oil pump properly adjusted
Linkage properly installed
Oil pump gear installed on crankshaft
CHECK
VALVE
TEST
To prevent
oil
from flowing into the engine
if
left unused for long periods of time a check
valve is installed in spacer assembly nozzle.
To verify proper operation of the check
valve; remove outlet line from oil pump. Attach
line to
a
carburetor diaphram pressure check-
ing
tool
and check pressure required to move
check valve
off
seat.
SPECIFICATION
Check valve requires
34
psi maxlmum to lift
off
seat and must hold
1
psi mlnlmum pres-
sure wlthout leaking.
NOTE: Check valve must have oil in
it
or
it will
not hold pressure.
NOTE: This service operation may have intro-
duced
air
into the line.
To
prevent possible
powerhead damage resulting from
air
entering
oil line during servicing; we recommend drain-
ing fuel tank and running mower using
a
64:l
fuel/oil
pre-mix
until no
air
bubbles are observed
in oil lines. Minimum
20
minutes.
3-3

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Lawn-Boy M Series Specifications

General IconGeneral
BrandLawn-Boy
ModelM Series
CategoryLawn Mower
LanguageEnglish

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