McCulloch MT 250 LK Operator's Manual page 5

TROUBLESHOOTING TABLE
WARNING:
Always stop unit and disconnect spark plug before performing all of the
recommended remedies below except remedies that require operation of the unit.
TROUBLE CAUSE
Engine will not
1. ON/STOP switch in STOP
start.
position.
2. Engine flooded.
3. Fuel tank empty.
4. Spark plug not firing.
5. Fuel not reaching
carburetor.
6. Carburetor requires
adjustment.
Engine will 1. Carburetor requires
not idle adjustment.
properly. 2. Crankshaft seals worn.
3. Compression low.
1. Air filter dirty.
Engine will not
2. Spark plug fouled.
accelerate,
lacks power,
3. Carburetor requires
or dies under
adjustment.
a load.
4. Carbon build-up on
muffler outlet screen.
5. Compression low.
Engine
1. Choke partially on.
smokes
2. Fuel mixture incorrect.
excessively.
3. Air filter dirty.
4. Carburetor requires
adjustment.
Engine runs 1. Fuel mixture incorrect.
hot.
2. Spark plug incorrect.
3. Carburetor requires
adjustment.
4. Carbon build-up on
muffler outlet screen.
REMEDY
1. Move ON/STOP switch to ON position.
2. See "Starting a Flooded Engine" in
Operation Section.
3. Fill tank with correct fuel mixture.
4. Install new spark plug.
5. Check for dirty fuel filter; replace.
Check for kinked or split fuel line;
repair or replace.
6. Contact an authorized service dealer.
1. See "Carburetor Adjustment" in
Service and Adjustments Section.
2. Contact an authorized service dealer.
3. Contact an authorized service dealer.
1. Clean or replace air filter.
2. Clean or replace plug
and regap.
3. Contact an authorized service dealer.
4. Contact an authorized service dealer.
5. Contact an authorized service dealer.
1. Adjust choke.
2. Empty fuel tank and refill with
correct fuel mixture.
3. Clean or replace air filter.
4. Contact an authorized service dealer.
1. Empty fuel tank and refill with
correct fuel mixture.
2. Replace with correct spark plug.
3. Contact an authorized service dealer.
4. Contact an authorized service dealer.
12
ASSEMBLY
WARNING:
Make sure unit is proper-
ly assembled and all fasteners are secure.
Examine parts for damage. Do not use dam-
aged parts.
It is normal for the fuel filter to rattle in the
empty fuel tank.
Finding fuel or oil residue on muffler is normal
due to carburetor adjustments and testing
done by the manufacturer.
SHAFT ASSEMBLY
CAUTION:
When assembling shaft, place
the unit on a flat surface for stability.
1. Align grooves on upper and lower shafts.
Upper Shaft
Grooves
Lower Shaft
2. Push the two shafts together until the lower
shaft is fully seated in the upper shaft (the
shafts lock into place).
3. Slide lower locking sleeve assembly over
upper locking sleeve assembly and tight-
en by turning clockwise.
Upper Locking
Sleeve Assembly
Lower Locking
Sleeve Assembly
NOTE:
If locking sleeve assembly will not
tighten, the shafts are not fully seated.
ADJUSTING THE HANDLE
WARNING:
When adjusting the assist
handle, be sure it remains above the locking
sleeve assembly and below the mark or arrow
on the shaft.
1. Loosen wing nut on handle.
2. Rotate the handle on the shaft to an up-
right position; retighten wing nut.
ATTACHING THE SHIELD
WARNING:
The shield must be prop-
erly installed. The shield provides partial
protection from the risk of thrown objects to
the operator and others and is equipped with
a line limiter which cuts excess line. The line
limiter (on underside of shield) is sharp and
can cut you.
1. Remove nut from shield.
2. Insert bracket into slot on shield.
3. Pivot shield until bolt passes through hole
in bracket.
4. Reinstall nut and tighten securely with
wrench (provided).
Shield
Bracket
Slot
Wrench
Nut
5