Yard-man YM70SS User Manual download pdf (Page 9)

MAINTENANCE & REPAIR INSTRUCTIONS

MAINTENANCE SCHEDULE

Perform these required maintenance procedures at the

frequency stated in the table. These procedures should also be

a part of any seasonal tune-up.

NOTE: Some maintenance procedures may require special tools

or skills. If you are unsure about these procedures take

your unit to any non-road engine repair establishment,

individual or authorized service dealer.

NOTE: Maintenance, replacement, or repair of the emission

control devices and system may be performed by any

non-road engine repair establishment, individual or

authorized service dealer.

In order to assure peak performance of your engine, inspection

of the engine exhaust port may be necessary after 50 hours of

operation. If you notice lost RPM, poor performance or general

lack of acceleration, this service may be required. If you feel

your engine is in need of this inspection, refer service to any

non-road engine repair establishment, individual or authorized

service dealer for repair. DO NOT attempt to perform this

process yourself as engine damage may result from

contaminants involved in the cleaning process for the port.

LINE INSTALLATION

This section covers both SplitLine™ and standard single line

installation.

Always use original equipment manufacturer 0.095 in. (2.41

mm) replacement line. Line other than the specified may make

the engine overheat or fail.

There are two methods to replace the trimming line:

• Wind the inner reel with new line

• Install a prewound inner reel

Winding the Existing Inner Reel

1. Hold the outer spool with one hand and unscrew the Bump

Knob™ counterclockwise (Fig. 15). Inspect the bolt inside

the Bump Knob to make sure it moves freely. Replace the

Bump Knob if damaged.

2. Remove the inner reel from the outer spool (Fig. 16).

3. Remove spring from the inner reel (Fig. 16).

Bump Knob™

Bolt

Fig. 15

Inner Reel

Spring

Outer Spool

Indexing Teeth

Fig. 17

Fig. 16

WARNING: To prevent serious injury, never

perform maintenance or repairs with unit running.

Always service and repair a cool unit. Disconnect

the spark plug wire to ensure that the unit cannot

start.

WARNING: Never use metal-reinforced line,

wire, chain or rope. These can break off and

become dangerous projectiles.

FREQUENCY MAINTENANCE REQUIRED REFER

Before starting Fill fuel tank with fresh fuel Page 3

Every 10 hours Clean and re-oil air filter Page 11

Every 25 hours

Check and clean spark arrestor

Check spark plug condition

and gap

Page 11

Page 12

Every 50 hours

Inspect exhaust port and spark

arrestor screen for clogging or

obstruction to assure

maximum performance levels

Page 11

4. Use a clean cloth to clean the the inner reel, spring, shaft,

and inner surface of the outer spool.

5. Check the indexing teeth on the inner reel and outer spool

for wear (Fig. 17). If necessary, remove burrs or replace the

reel and spool.

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Yard-man YM70SS User Manual Page 9

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