Manual Solo 640 (page 23 of 72) (English, German, Dutch, French, Italian, Spanish)

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1. The shape of the cutters is divided in:

a. full chisel (square cutter for professional chain saws) fig. 37a.

b. semi-chisel (chamfered cutting edge for semi-professional and

consumer saws) fig. 37b.

2. The chain pitch determines the size of the chain. Pitch is equal

to the distance between 3 consecutive rivets, divided by 2 and is

expressed in inches according to international standards.

(fig. 37B).

Pitch Drive link gauge

inches = (mm) mm = (inches)

3/8" S (9,32 mm) 1,3 mm (.050")

3. The gauge of the drive link is the thickness of the drive link

part which extends into the guide bar groove. (fig. 37C).

CAUTION! Use only approved and original

replacement saw chains and guide bars. Data for the

correct saw chain of your chain saw is listed in the

section ”Technical Specifications”.

CHAIN TENSION

Correct chain tension is most important for the life of chain, bar

and sprocket.

Regularly check the chain tension after the engine has been

stopped and bar and chain have cooled down. Prior to re-

tensioning, loosen nuts for the side cover. (Also refer to section

‘Assembly”, item 4).

Follow all instructions carefully on saw chain sharpening.

Incorrectly sharpened chain causes additional load and premature

wear to the chain as well as guide bar. Increased risk of kick-back

results from excessively large depth gauge settings.

Saw Chain Sharpening (fig. 38/29/40)

Caution! Prior to any maintenance on the saw chain,

always switch off engine and wear protective gloves!

- For sharpening, use the correct diameter, special saw chain

file (refer to filing chart). Standard round files are not suitable.

– File on the forward stroke only (see arrow), not on the back

stroke. (fig. 38)

- File the shortest cutter first. The length of that cutter will be

the guide length for all other cutters (fig. 38). All cutters should

end up the same length.

- A filing guide makes filing much easier. A guide shows the

correct filing angle (align markings parallel to the saw chain)

and limits the filing depth to 4/5 of the file diameter. (fig. 39).

General Filing Instructions

1. Support file holder on cutter top plate.

2. File all cutters on one side from inside out, then sharpen the

other side.

3. Align markings on the file holder parallel to the saw chain.

4. File as much as to remove any damage to the cutting edge on

top and side plate of the cutter.

For your safety: When advancing chain by hand

during the filing process, always move the chain

towards the guide bar tip. This avoids injury should

your hand slip (fig.7).

Chain Filing Chart

Setting Depth Gauge (fig. 40)

The gap between the depth limiter (round nose) and the cutting

edge of the cutter determines the thickness of the chip. The best

cutting performance is achieved with the recommended depth

gauge gap.

1. Check the depth gauge setting with every sharpening

2. Place depth gauge tool (not included with saw) on top of cutter.

If the depth gauge projects above the tool level, file off with flat

file.

3. Round off the front corner of the depth gauge to its original

shape.

Caution! An excessively large depth gauge

gap causes chain vibration and increases

the risk of kick-back!

Guide Bar Maintenance (fig. 41)

The guide bar of your saw chain requires maintenance just like

the saw chain. The bar rails must be square and flat and the bar

groove must not be widened. To prevent uneven wear of the

guide bar we recommend you turn the bar over after each

sharpening of the chain. On sprocket nose guide bars, grease

the sprocket with bearing grease. Use a special grease gun and

force the grease through a small lubrication hole on the side of

the sprocket nose. Grease after every refueling and rotate the

sprocket for good coverage. (fig. 43). (Also see ”Maintenance

Chart”)

Important! Guide Bars on chain saws are specifically designed

to provide a guide track for saw chain and should never be used

as a pry bar or crow bar. Any twisting, turning or levering in the

cut will reduce the life of the bar rails. This will also void warranty

on the guide bar! (fig. 42)

CHAIN SAW CLEANING

After every cutting job, thoroughly clean the saw and inspect

for any damage. Important check points are chain brake system,

cooling air intake areas, cylinder cooling fins and air filter.

Caution! Always wear safety goggles when using

compressed air to prevent eye injury. Always use

environmentally friendly cleaning material available

from your specialist dealer. Do not clean chain saw

with fuel!

Chain Brake Maintenance (fig.44)

Operator Checks:

Periodically check for smooth functioning. Remove resin, chips

and other foreign matter. Apply grease or high temperature

resistant motor oil to visible joints.

Brake test:

- start engine

- engage brake while engine idles

– briefly accelerate to full throttle

– the chain should remain stationary

Chain

Pitch

Filing

Angle

Depth Gauge

Gap

Filing Direction

horizontal

File Dia.

mm in.

3/8 S

4,0

5/32 30°

0,65mm

.025"

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Solo 640 Manual

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