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Dolmar PS-7900 - User Manual

Dolmar PS-7900
76 pages
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Owner’s and Safety Manual
for Gasoline Chain Saws (page 2 - 37)
Manuel d’emploi et de sécurité
de tronçonneuses thermiques (page 38 - 73)
WARNING!
Read and understand this Manual. Always follow safety precautions in the Owner’s and Safety Manual.
Improper use can cause serious injury!
The engine exhaust from this product contains chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm. Preserve this Manual carefully!
ATTENTION!
Suivez toujours les conseils de sécurité du présent manuel d’emploi et de sécurité. Une utilisation
incorrecte de la tronçonneuse peut entraîner des blessures graves! Conservez avec soin ce manuel!
Les gaz d’échappement émis par ce produit contiennent des produits chimiques connus par l’Etat de
Californie pour provoquer le cancer, des défauts de naissance ou autres dommages de reproduction.
Lisez et comprenez ce manuel.
PS-6400, PS-6400 H
PS-6400 C, PS-6400 CH
PS-7300, PS-7300 H
PS-7900, PS-7900 H

Table of Contents

Other manuals for Dolmar PS-7900

Questions and Answers

  • L
    Lawrence ThompsonAug 17, 2025
    What to do if warm Dolmar Chainsaw engine doesn’t start?
    • N
      Nicholas NunezAug 17, 2025
      If your warm Dolmar Chainsaw engine doesn’t start, it could be due to a wrong carburetor adjustment or flooding caused by excessive choke usage. Adjust the carburetor and avoid excessive use of the choke.
  • D
    dcastroAug 20, 2025
    Why won't my Dolmar Chainsaw start?
    • D
      Daniel BergerAug 20, 2025
      Several issues could prevent your Dolmar Chainsaw from starting. It could be a malfunction in the fuel supply or compression system, or a mechanical issue. Check the ignition spark, ensure the fuel tank is full, verify the starter engages, and inspect the wiring for faults. Other potential causes include an incorrectly set choke, a defective carburetor, a dirty fuel filter, or a bent or interrupted fuel line. Adjust the choke, clean or replace the carburetor and fuel filter, and check the fuel line. Also, inspect and replace any defective cylinder base packing rings, radial shaft packings, or piston rings. Replace the spark plug if it doesn't seal properly. Finally, examine the starter spring and any internal engine parts for breakage, repairing or replacing as needed.
  • T
    Terry LopezAug 25, 2025
    What to do if my Dolmar Chainsaw engine starts, but dies immediately?
    • J
      Justin Wolfe MDAug 25, 2025
      If your Dolmar Chainsaw engine starts but dies immediately, it could be due to several factors. Check the idling adjustment, and clean the fuel filter and carburetor. The tank venting might be defective, the fuel line interrupted, or the cable or STOP switch defective. Inspect the tank venting, fuel line, cable, and STOP switch. Also, the decompression valve could be dirty, so clean it.
  • M
    Michael BerryAug 27, 2025
    Why is there no chain lubrication in my Dolmar PS-7900?
    • L
      lori71Aug 27, 2025
      If your Dolmar Chainsaw isn't lubricating the chain, it could be due to several reasons. The oil tank might be empty, so refill it. The oil guide groove could be dirty, so clean it. The oil-pump adjusting screw might be incorrectly adjusted, so adjust the oil pump. Lastly, the oil pump drive could be defective, so check it for any issues.
  • C
    Chad BennettAug 30, 2025
    What to do if my Dolmar PS-7900 Chainsaw starts then dies?
    • M
      Melissa RhodesAug 30, 2025
      If your Dolmar Chainsaw starts but immediately dies, the idling might be incorrectly adjusted, or the fuel filter or carburetor might be dirty. Adjust the idling settings and clean or replace the fuel filter and carburetor. Other potential causes include a defective tank venting system, an interrupted fuel line, a defective cable, or a faulty STOP switch. Repair or replace any defective components. Also, the decompression valve might be dirty, so try cleaning it.
  • M
    Mike RogersSep 3, 2025
    Why is my Dolmar Chainsaw hard to start when warm?
    • D
      daniellegutierrezSep 3, 2025
      If you're experiencing difficulties starting your Dolmar Chainsaw when it's warm, the carburetor adjustment might be incorrect. Adjust the carburetor to the correct settings.
  • M
    Michelle DickersonSep 6, 2025
    How to unlock the chain on my Dolmar Chainsaw?
    • M
      moralesbrianSep 6, 2025
      If the chain on your Dolmar Chainsaw isn't running, the chain brake may be actuated. Release the chain brake to allow the chain to run.
  • A
    Andrew MooreSep 9, 2025
    How to fix insufficient power in my Dolmar PS-7900?
    • T
      Tara StoneSep 9, 2025
      If your Dolmar Chainsaw has insufficient power, the issue might stem from a dirty air filter, incorrect carburetor adjustment, a clogged muffler, a clogged exhaust channel in the cylinder, a clogged spark arrester screen, or a worn piston. To address this, you should clean or replace the air filter, adjust the carburetor, and inspect the muffler and exhaust channels for any blockages.
  • C
    Catherine MorrisNov 13, 2025
    Why my Dolmar Chainsaw engine does not start?
    • S
      susan79Nov 13, 2025
      If your Dolmar Chainsaw engine is not starting or starts with difficulty, there may be several reasons. It could be a malfunction in the fuel supply, compression, or mechanical components. Check the ignition system, fuel supply, compression system, and mechanical components. Other potential causes include a faulty switch, wiring, plug cap, or spark plug. Inspect these parts for any defects. Also, the choke position might be incorrect, the carburetor or fuel filter could be dirty, or the fuel line might be bent or damaged. Adjust the choke, clean or replace the carburetor and fuel filter, and inspect the fuel line. Cylinder base packing ring or radial shaft packings could be defective. Check the cylinder and piston components for defects. Ensure the spark plug is sealing properly. Finally, ...

Summary

Emissions Component Defect Warranty

Warranty Period and Owner Responsibilities

Covers warranty duration, owner duties, and limitations.

General Safety Precautions

Symbols and Warnings

Explains common symbols and critical warnings.

Operator Safety Precautions

Specific safety guidelines for chain saw users.

Kickback and Reactive Forces

Understanding Kickback

Explains dangerous forces like kickback, pushback, and pull-in.

Avoiding Kickback and Reactive Forces

Provides methods to prevent dangerous reactive forces.

Chain Saw Cutting Techniques

Felling, Bucking, and Limbing

Techniques for felling trees, cutting logs, and removing branches.

Component Identification and Technical Data

Denomination of Components

Identifies all parts of the chain saw with numbers.

Technical Data Specifications

Specifications and performance data for the chain saw models.

Chain Saw Setup and Operation

Mounting and Tightening the Saw Chain

Detailed guide on fitting and tensioning the saw chain.

Fuel and Chain Oil Management

Information on fuel mixture, storage, and chain lubrication.

Starting and Stopping the Engine

Safe procedures for starting and stopping the engine.

Chain Saw Maintenance

Carburetor Adjustment

Adjusting the carburetor for optimal performance.

Chain Sharpening Procedure

Guide to sharpening the saw chain and using files.

Air Filter Cleaning

Steps for cleaning and maintaining the air filter.

Periodic Maintenance and Troubleshooting

Periodic Maintenance Schedule

Overview of required maintenance tasks and frequencies.

Troubleshooting Common Issues

Solutions for malfunctions and operational problems.

Spare Parts and Accessories

Extract from the Spare Parts List

List of available spare parts and their numbers.

Dolmar PS-7900 Specifications

General IconGeneral
BrandDolmar
ModelPS-7900
CategoryChainsaw
LanguageEnglish

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