Manual McCulloch B33 PS (page 20 of 504) (All languages)

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To examine the spark plug

CAUTION: Always use the recommended

spark plug type. Incorrect spark plug type

can cause damage to the product.

• Examine the spark plug if the engine is low on

power, is not easy to start or does not operate

correctly at idle speed.

• To decrease the risk of unwanted material on the

spark plug electrodes, obey these instructions:

a) Make sure that the idle speed is correctly

adjusted.

b) Make sure that the fuel mixture is correct.

c) Make sure that the air filter is clean.

• If the spark plug is dirty, clean it and make sure that

the electrode gap is correct, refer to

TECHNICAL

DATA on page 22

. (Fig. 56)

• Replace the spark plug if it is necessary.

To sharpen grass cutters and grass

blades

1. Sharpen grass cutters and grass blades with a

single-cut flat file.

2. Sharpen all edges of the grass cutters and blades

equally to keep the balance. (Fig. 57)

To replace the trimmer line

(Fig. 58)

(Fig. 59)

(Fig. 60)

(Fig. 61)

(Fig. 62)

(Fig. 63)

(Fig. 64)

(Fig. 65)

To do the maintenance on the pole

saw attachment

WARNING: Remove the spark plug before

you do the maintenance on the attachment.

To install or replace the chain

WARNING:

When the chain becomes worn

or damaged, replace it with the low kickback

chain. See

ATTACHMENTS on page 23

Note: Always use gloves when you touch the chain.

1. Disconnect the spark plug cap.

2. Use the wrench to loosen the sprocket cover nut by

turning counterclockwise. (Fig. 66)

3. Remove the sprocket cover nut, washer (B) and

sprocket cover (C). (Fig. 67)

4. Remove the guide bar and saw chain if they are

installed.

5. If you are replacing a chain, remove the old chain

from the guide bar and discard it.

6. Remove all sawdust, dirt and other unwanted

material from the surfaces with a soft brush or a dry

cloth.

7. Do the maintenance on the guide bar. See

To do the

maintenance on the guide bar on page 21

8. Turn the adjustment screw counterclockwise until the

adjustment pin is at the position shown. (Fig. 68)

9. Install the new chain on the guide bar with the

cutters in the correct direction. Start at the top of the

guide bar and move to the front of the guide bar.

(Fig. 69)

Note: Make sure the bottom of the chain is in the

groove on the guide bar and engaged on the front

sprocket of the guide bar.

10. When the chain is on the guide bar, install them on

the saw and put the chain around the sprocket. Align

the sprocket teeth with the chain.

11. Make sure the adjustment pin is in the adjustment

pin hole of the guide bar. (Fig. 70)

Note: An adjustment pin and screw are used to

adjust the tension of the chain. It is very important

when you assemble the guide bar that the

adjustment pin is engaged in the adjustment pin hole

on the guide bar.

12. Attach the sprocket cover (A), washer (B) and

sprocket cover nut (C). Lightly tighten the nut with

your fingers. (Fig. 71)

13. Adjust the chain tension. See

To adjust the chain

tension on page 20

Note:

Examine the chain tension regularly. A chain

that has the correct tension has better performance

and longer life.

To adjust the chain tension

WARNING:

Put on the gloves before you

adjust the chain tension. The chain is sharp

and can cause injuries to you.

Note: The chain extends during the operation, specially

when you operate for the first 15 minutes. You must

examine and adjust the chain tension frequently after

you use or refuel the product.

1. Examine the chain and guide bar for any damage.

Replace any part that is damaged.

860 - 001 - 28.10.2018

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McCulloch B33 PS Manual

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