Instruction Manual
Table Of Contents
- STIHL MS 151 C
- 1 Guide to Using this Manual
- 2 Safety Precautions
- 3 Reactive Forces
- 4 Working Techniques
- 5 Cutting Attachment
- 6 Mounting the Bar and Chain
- 7 Tensioning the Saw Chain (side chain tensioner)
- 8 Checking Chain Tension
- 9 Fuel
- 10 Fueling
- 11 Chain Lubricant
- 12 Filling Chain Oil Tank
- 13 Checking Chain Lubrication
- 14 Chain Brake
- 15 Starting / Stopping the Engine
- 15.1 Positions of the Master Control lever
- 15.2 Positions of Choke Shutter
- 15.3 Adjust Master Control lever
- 15.4 Manual fuel pump
- 15.5 Holding the Chain Saw
- 15.6 Actuating
- 15.7 Starting the Chainsaw
- 15.8 When Engine Begins to Fire
- 15.9 As Soon As the Engine Runs
- 15.10 At Very Low Outside Temperatures
- 15.11 Shut off the engine
- 15.12 If Engine Does Not Start
- 15.13 If Fuel Tank Has Been Run Completely Dry and Then Refueled
- 16 Operating Instructions
- 17 Taking Care of the Guide Bar
- 18 Cleaning the Air Filter
- 19 Adjusting the Carburetor
- 20 Spark Plug
- 21 Storing the Machine
- 22 Checking the Chain Sprocket
- 23 Maintaining and Sharpening the Saw Chain
- 24 Maintenance and Care
- 25 Minimize Wear and Avoid Damage
- 26 Main Parts
- 27 Specifications
- 28 Special Accessories
- 29 Ordering Spare Parts
- 30 Maintenance and Repairs
- 31 Disposal
- 32 EC Declaration of Conformity
NOTICE
Always slacken off the chain again after finishing
work. The chain contracts as it cools down. If it is
not slackened off, it can damage the crankshaft
and bearings.
16.3.1 Short-term storage
Wait for engine to cool down. Keep the machine
with a full tank of fuel in a dry place, well away
from sources of ignition, until you need it again.
16.3.2 Long-term storage
See "Storing the machine"
17 Taking Care of the Guide
Bar
3
1
2
143BA026 KN
► Turn the guide bar over – every time you
sharpen the chain and every time you replace
the chain – this helps avoid one-sided wear,
especially at the nose and underside of the
bar.
► Regularly clean the oil inlet hole (1), the oil‐
way (2) and the bar groove (3)
► Measure the groove depth – with the scale on
the filing gauge (special accessory) – in the
area used most for cutting
Chain type Chain pitch Minimum
groove
depth
Picco 1/4" P 4.0 mm
Rapid 1/4“ 4.0 mm
Picco 3/8" P 5.0 mm
Rapid 3/8“; 0.325“ 6.0 mm
Rapid 0.404“ 7.0 mm
If groove depth is less than specified:
► Replace the guide bar
The drive link tangs will otherwise scrape along
the bottom of the groove – the cutters and tie
straps will not ride on the bar rails.
18 Cleaning the Air Filter
18.1 If there is a noticeable loss of
engine power
2011BA024 KN
► Turn the twist lock 90° counterclockwise.
► Remove the shroud upwards.
2011BA025 KN
► Remove the air filter upwards.
► Wash the filter in STIHL special cleaner (spe‐
cial accessory) or a clean, non-flammable sol‐
ution (e.g. warm soapy water) and then dry.
NOTICE
Do not use a brush to clean the filter.
Always replace a damaged filter.
19 Adjusting the Carburetor
19.1 General Information
The carburetor comes from the factory with a
standard setting.
This setting provides an optimum fuel-air mixture
under most operating conditions.
19.2 Preparations
► Shut off the engine.
► Check the air filter and clean or replace if nec‐
essary.
► Check the spark arresting screen (not in all
models, country-specific) in the muffler and
clean or replace if necessary.
English 17 Taking Care of the Guide Bar
26 0458-506-0121-B