Dolmar PS-421 Manuale Utente

The PS-351, PS-421 will be delivered in a protective cardboard box to prevent transport damage. Cardboard is a 

basic raw material and is consequently reuseable or suitable for recycling (waste paper recycling).

Careless or improper use of this product can cause serious or even fatal injury.

Before operating a chain saw or other DOLMAR products it is important that you read, fully understand and  

carefully follow the instructions outlined in this operator’s manual. Kickback may cause severe or fatal injury 

and is one of many potential dangers in operating a chain saw. Kickback and other safety related precautions 

are described in detail within this operator’s manual. Additional operator’s manuals are available from DOLMAR 

POWER PRODUCTS, PO Box 5007, Alpharetta, GA, 30005-5007, USA, Telephone 1-888-OPE-PART 

or info@

dolmar.com

Page

Delivery inventory .................................................... 4

Symbols ................................................................... 4

Safety precautions ..............................................5-6

Denomination of components ................................ 17

Technical data........................................................ 8

Only for Models with fastening nuts on the sprocket guard 

  Mounting the guide bar and saw chain ........9-26

  Tightening the saw chain .................................. 20

  Checking the chain tension .............................. 2

  Retightening the saw chain .............................. 2

Only for Models with QuickSet guide bar

 ..................

 

  Mounting the guide bar and saw chain ............. 22

  Tensioning the saw chain ................................. 2

  Checking the chain tension .............................. 2

  Retensioning the saw chain .............................. 2

Models with quick tensioner on sprocket guard

 ..........

 

  Mounting the guide bar and saw chain ............. 24

  Tightening the saw chain .................................. 25

  Checking the chain tension .............................. 26

  Retensioning the saw chain .............................. 26

Chain brake ........................................................... 26

Engaging the chain brake ...................................... 26

Fuel / Refuelling................................................27-28

Page

Chain lubrication .................................................... 29

Starting the engine ................................................ 0

Stopping the engine............................................... 0

Checking the chain brake ...................................... 

Working in winter ................................................... 

Adjusting the carburetor ........................................ 2 

Sharpening the saw chain ................................-4

Cleaning the brake band and sprocket interior ...... 5

Cleaning the guide bar .......................................... 5

Replacing the saw chain........................................ 6

Cleaning the air filter.............................................. 37

Replacing the spark plug ....................................... 8

Checking the muffler screws ................................. 8

Replacing the starter cable .................................... 9

Replacing the return spring ................................... 9

Mounting the fan housing ...................................... 9

Cleaning the cylinder area ..................................... 40

Replacing the fuel filter .......................................... 40

Replacing / cleaning the spark arrester screen ..... 40

Instructions for daily and periodic maintenance .... 4

Service, spare parts and guarantee ...................... 42

Troubleshooting ..................................................... 4

Extract from the spare parts list ........................44-45

This product complies with:  American National Standard Institute  B 175.1-2000 chain saw safety standard. 

 

Canadian Standards Association 

Z62.-0 chain saw safety standard.   

 

 

Z62.-04 chain saw kickback standard.

 

Society of Automotive Engineers 

SAEJ 5-Jun 95 „Multiposition small   

 

 

engine exhaust system fire ignition

 

 

suppression”

The Emissions Compliance Period referred to on the emission Compliance label indicates the number of operat-

ing hours for which the engine has been shown to meet federal emissions requirements. Category C= 50 hours, 

B= 25 hours, and A= 00 hours.
With the purchase of this chain saw you have chosen a German quality product. Important instructions for the 

assembly and operation of this saw are given in this manual. For your own safety, we ask you to read the acci-

dent prevention instructions very carefully before putting your chain saw into operation, as incorrect handling can, 

despite all precautions, lead to accidents. With a little care and attention you will have good service and lasting 

satisfaction from this first-rate product.