Lawn-Boy M Series User Manual

AN EXPERT AT TROUBLESHOOTING FOLLOWS A SET PROCEDURE
You, can instill confidence in your customers by a careful diagnosis of their mower troubles. Diagnosis is
a talent, a talent which must be learned and continually practiced.
WITH THIS INFORMATION, YOU CAN PROCEED WITH
SPECIFIC TESTS
ENGINE TROUBLESHOOTING CHART
Cause Remedy and Reference
ENGINE FAILS TO START OR STARTS WITH DIFFICULTY
No fuel in tank
Fuel shutoff valve dosed
Grass Catcher
not installed or fully seated at chute
Blade control
bail held against handle
Oil level
low (Oil injected models)
Blocked
fuel line
Choke not closing fully
Throttle control in
STOP position (BBC Models)
Improper fuel/air mixture
Tank cap vent obstructed
Air filter or prefilter dogged
Water in fuel
Engine flooded
spark plug fouled
Exhaust
plugged
Engine not cranking fast enough (Electric Start Models)
Crankcase seals and/or gaskets leaking
Poor Compression
Flywheel key sheared
Fill tank with dean, fresh fuel. (with correct fuel/oil ratio
where applicable).
Open valve.
Install grass catcher fully into chute interlock switch.
Adjust flywheel brake cable.
(Zone Start Models).
Fill oil reservoir with Lawn-Boy 2 CYCLE ASHLESS OIL
Clean fuel screen and line. If necessary, remove and dean
carburetor.
Adjust
throttle cable and/or choke linkage.
Move throttle
to run or choke position (BBC Models).
Clean carburetor.
Open vent
in fuel tank cap or replace cap.
Clean pre-filter. Replace
air filter.
Drain tank. Clean carburetor and fuel lines. Dry spark plug
electrodes. Fill tank with dean, fresh
fuel. (with correct fuel/
oil ratio where applicable).
Close
fuel shutoff place engine speed control in fast and
pull starter until engine starts. Reopen fuel shutoff for
normal fuel flow immediately after engine starts.
Clean
and regap spark plug electrode. Replace spark plug.
Clean exhaust
port and/or muffler.
Recharge battery. Check charging system.
Replace
seals and/or gaskets.
Overhaul engine.
Check flywheel key and keyway; replace parts if necessary
Tighten flywheel nut to proper toque.
13-1

Lawn-Boy M Series Specifications

General

Brand	Lawn-Boy
Model	M Series
Category	Lawn Mower
Language	English