Handleiding MTD 990 series (pagina 27 van 30) (Engels)

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MAINTENANCE AND REPAIR

Caution: Before performing any work on the unit:

– Switch off the engine.

– Wait until all moving parts have come to standstill;

the engine must have cooled down.

– Remove spark-plug terminal from the engine to prevent

the engine from starting unintentionally.

Have all repairs carried out by a repair shop only.

At the end of the season have the unit inspected and

serviced by a specialist company.

Maintenance schedule

Have this work carried out by a specialist company.

Installing the cutting line

This section deals with both the installation of the

Split-Line™ and the simple standard line.

Always use a replacement cutting line with a diameter of

2.41 mm. If using a cutting line which has a length other than

the one indicated, the engine may overheat or misfire.

There are two methods of replacing the cutting line:

 Wind the new line onto the inner coil

 Install an inner coil with a prewound line

Wind the line onto the existing inner coil

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

bump head clockwise with the other hand (Fig. 26).

Check that the bolt inside the bump knob can move

freely. Replace a damaged bump knob.

2. Remove the inner coil from the outer coil. (Fig. 26).

3. Take the spring out of the inner coil (Fig. 26).

4. Clean the inner coil, the spring, the shaft and the inner

surface of the outer coil with a clean cloth (Fig. 27).

5. Check the teeth on the inner and outer coils for wear

(Fig. 28). If required, remove burrs or replace the coils.

Note: The Split-Line™ (double lines) can be used on a coil

with slot-type holes only. Single line can be used on both

coil types. Use Figure 29 to identify your coil type.

Note: Always install the correct trim line length in the unit.

The line may not be released correctly if it is too long.

Installing the single line

To install the Split-Line™, please read Point 8

6. Take approx. 7.3 metres of new trim line and fold in half.

Feed each end of the line through each of the two holes

in the coil (Fig. 30). Pull the line through the coil until the

loop is as small as possible.

7. Wind the lines onto the coil in tight, even layers (Fig. 31).

Wind the line in the direction indicated on the coil. Place

your index finger between the two lines to prevent them

from overlapping. Do not overlap the ends of the line. In

addition to step 11.

Split-Line™

8. Take approx. 3.65 metres of new trim line. Feed one end

of the line through one of the two holes in the coil

(Fig. 32). Pull the line through the coil until there is only

approx. 10 cm left.

9. Feed the end of the line into the open hole in the coil and

pull the line tight until the loop is as small as possible

(Fig. 32).

10. Before winding the line, divide a length of approx. 15 cm.

11. Wind the line in tight, even layers in the direction

indicated on the coil.

Note: If the line is not wound in the direction indicated on the

coil, the cutting attachment will not run correctly.

12. Feed the ends of the line into the two retaining slots

(Fig. 33).

13. Feed the ends of the line through the eyes in the coil

housing and place the coil with spring in the coil housing

(Fig. 26) Press the coil and coil housing together. Hold

coil and coil housing and simultaneously grip the ends of

the line and pull firmly to detach the line from the

retaining slots in the coil.

Note: The spring must be installed on the coil before the

cutting attachment is reinstalled.

14. Hold the spool in place and install the bump head by

rotating it anti-clockwise. Tighten firmly.

Maintenance

work

before

using

the unit

after the

first

10 hours

every

10 hours

every

25 hours

Check fuel and

oil level

Change oil xx

Clean/oil air filter x

Clean spark

arrestor

Check/set

valve play

Check spark

plug/spark-plug

terminal

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