Yard Machines 340 Thru 390, Operator'S Manual

Page: 11 / 24

11
CARBURETOR ADJUSTMENT
WARNING:
If any adjustments are
made to the engine while the engine is
running (e.g. carburetor), disengage all
clutches and tines. Keep clear of all
moving parts. Be careful of heated
surfaces and muffler.
Minor carburetor adjustment may be required to
compensate for differences in fuel, temperature,
altitude or load. If adjustments are needed, refer to
the engine manual packed with the tiller.
NOTE:
A dirty air cleaner will cause engine to run
rough. Be certain air cleaner is clean and attached
to the carburetor before adjusting carburetor. Do not
make unnecessary adjustments. Factory settings
are satisfactory for most applications and conditions.
SECTION 9: LUBRICATION
WARNING:
Always stop engine and
disconnect spark plug wire before
cleaning, lubricating or doing any kind
of work on tiller.
Pivot Points-Remove the belt cover and lubricate
all moving parts and pivot points at least once a
season using SAE 30 engine oil.
Chain Drive-The chain case is pre-lubricated and
sealed at the factory.
SECTION 10: MAINTENANCE
WARNING:
Disconnect spark plug
wire and ground it against the engine
before performing any repairs or
maintenance.
TROUBLE SHOOTING
Refer to page 13 of this manual for trouble shooting
information.
ENGINE
Refer to the separate engine manual for all
engine maintenance instructions.
Maintain engine oil as instructed in the separate
engine manual packed with your unit. Read and
follow instructions carefully.
Service air cleaner every 25 hours under normal
conditions. Clean every few hours under extremely
dusty conditions. Poor engine performance and
flooding usually indicates that the air cleaner should
be serviced. To service the air cleaner, refer to the
separate engine manual packed with your unit.
IMPORTANT:
Never run your engine without air
cleaner completely assembled.
The spark plug should be cleaned and the gap
reset once a season. Spark plug replacement is
recommended at the start of each tilling season;
check engine manual for correct plug type and gap
specifications.
Clean the engine regularly with a cloth or brush.
Keep the cooling system (blower housing area)
clean to permit proper air circulation which is
essential to engine performance and life. Be certain
to remove all dirt and combustible debris from
muffler area.
CLEANING THE TINE AREA
Clean the underside of the tine shield after each
use. The dirt washes off the tines easier if washed
off immediately instead of after it dries.
BELT REMOVAL AND REPLACEMENT
Your tiller has been engineered with belts made of
special material (Kevlar Tensile). They should not
be replaced with an off-the-shelf belt. If belt
replacement is required, order belt or belts by part
number from your nearest authorized service dealer.
Forward Drive Belt - Part No. 754-0428
Reverse Drive Belt (390 Only) - Part No. 754-0429
Reverse Drive Belt (Model 390 Only)
1. Disconnect and ground the spark plug wire
against the engine. Remove the belt cover from
the left side of the tiller as follows.
2. Remove two self-tapping screws and flat
washers from the front of belt cover. (See
Figure 18.)
3. Remove the hex stop nut and flat washer from
the side of the belt cover. Remove belt cover.
Figure 18
4. Lift the belt off the transmission pulley.
5. Remove the hex nut which secures the reverse
idler pulley to the idler bracket. Slide idler pulley
out and remove the belt. (See Figure 19.)
Hex Nut and Washer
Self-Tapping
Screws
Belt
Cover