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Hitachi CS 51EAP - User Manual

Hitachi CS 51EAP
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PRODUCT NAME
Hitachi Engine Chain Saw
Models CS 51EAP
CS 51EA
International Sales Division
䌃
TROUBLESHOOTING GUIDE ---------------------------------------------------------------------------------------------- 1
1. Troubleshooting and correction ------------------------------------------------------------------------------- 1
REPAIR GUIDE ----------------------------------------------------------------------------------------------------------------- 3
1. Precaution on maintenance, inspection and repair ------------------------------------------------------ 3
2. Inspection criteria for each section and consumable parts -------------------------------------------- 3
CONTENTS
Page
LIST Nos.
CS 51EAP: F009
CS 51EA: F008
Feb. 2012

Table of Contents

Other manuals for Hitachi CS 51EAP

Preview: Handling Instructions
Handling Instructions76 pages

Questions and Answers

  • J
    Jennifer ReedJul 31, 2025
    What to do if the spark plug is dry on my Hitachi CS 51EAP Chainsaw?
    • M
      Michael CunninghamAug 1, 2025
      If the spark plug in your Hitachi Chainsaw remains dry after repeated starting attempts, it could be due to several reasons. First, ensure there's fuel in the tank and that it is properly mixed (25:1 to 50:1). Other potential causes include a clogged fuel filter (clean or replace it), a faulty fuel pipe (adjust, replace, or connect it properly), a faulty vent hole on the fuel tank inner cap (replace the cap), or a faulty carburetor (adjust, clean, or replace it).
  • A
    ashortAug 6, 2025
    Why my Hitachi CS 51EAP Chainsaw startup is impossible?
    • J
      Jennifer GordonAug 6, 2025
      If your Hitachi Chainsaw won't start, there could be several reasons. A faulty piston ring might be the cause, requiring parts replacement. Other potential issues include a worn piston or cylinder, an expired oil seal, defective packing, or a faulty decompression valve (clean or replace it). Also, check for foreign matter causing a short circuit between the spark plug electrodes; remove any debris, and if it happens often, disassemble and clean the engine.
  • J
    Jesse MooreAug 11, 2025
    What to do if my Hitachi Chainsaw stops idling?
    • A
      Angela WestAug 11, 2025
      If your Hitachi Chainsaw starts but won't idle, it could be due to a weak spark (clean or replace the spark plug), an improper air gap (adjustment needed), low compression, a worn piston ring (replacement needed), an expired oil seal, or a faulty decompression valve (cleaning or replacement needed).
  • J
    Jordan GarciaAug 16, 2025
    Why the starter handle cannot be pulled on my Hitachi CS 51EAP?
    • E
      Eric RamirezAug 16, 2025
      If the starter handle on your Hitachi Chainsaw cannot be pulled, it could be due to a faulty piston ring, requiring disassembly and parts replacement. Other potential causes include a seized piston and cylinder, faulty crankshaft bearings, or the magneto rotor contacting the ignition coil.
  • H
    Heather HallAug 21, 2025
    What to do if the recoil starter does not rotate on my Hitachi CS 51EAP Chainsaw?
    • S
      Stephanie GuerraAug 21, 2025
      If the recoil starter on your Hitachi Chainsaw doesn't rotate, it might be due to a broken recoil starter (inspect and replace it) or a faulty starter pawl.
  • D
    davidnewmanAug 27, 2025
    How to fix a wet spark plug on Hitachi CS 51EAP?
    • D
      Daniel HoffmanAug 27, 2025
      If the spark plug in your Hitachi Chainsaw is wet due to too much fuel, it's likely because the starter handle was repeatedly pulled with the choke button engaged. To fix this, dry the spark plug and remove the excessive fuel.

Summary

TROUBLESHOOTING GUIDE

Troubleshooting and correction

Details common engine problems and their causes/corrective actions.

REPAIR GUIDE

Precautions on maintenance, inspection and repair

Essential safety and procedural advice before performing repairs.

Inspection criteria for each section and consumable parts

Specific metrics and standards for checking components.

Inspection and Repair Procedures

Checking the spark of the spark plug

Procedure to test the spark plug's functionality.

Adjustment of the carburetor

Steps to adjust engine idling and performance via the carburetor.

Disassembly and Reassembly

Disassembly and reassembly of the cleaner and carburetor

Instructions for removing and reinstalling the air cleaner and carburetor.

Connecting the fuel pipes

Guidance on correctly connecting fuel lines to the carburetor.

Disassembly and reassembly of the recoil starter

Steps for taking apart and putting back the starter mechanism.

Disassembly and reassembly of the rear handle and engine case

Instructions for removing and reinstalling the rear handle and engine housing.

Disassembly and reassembly of the clutch and oil pump

Procedures for removing and reinstalling the clutch and oil pump assemblies.

Disassembly and reassembly of the magneto rotor

Steps for removing and reinstalling the magneto rotor.

Adjustment of clearance between the magneto rotor and ignition coil

How to set the gap between the magneto rotor and ignition coil.

Wiring diagram

Visual representation of the engine's electrical connections.

Disassembly and reassembly of the muffler

Instructions for removing and reinstalling the muffler.

Disassembly and reassembly of the cylinder and scavenging cover

Steps for removing and reinstalling the cylinder and scavenging covers.

Disassembly and reassembly of the piston and piston ring

Procedures for removing and reinstalling the piston and piston rings.

Disassembly and reassembly of the engine case

Instructions for removing and reinstalling the engine case halves.

Disassembly and reassembly of the side case

Steps for removing and reinstalling the side case.

Confirmation After Reassembly

Check the following before starting the engine.

Pre-start checks to ensure proper assembly and safety.

Check the following after starting the engine.

Post-start checks for engine operation and performance.

Hitachi CS 51EAP Specifications

General IconGeneral
Displacement50.1 cc
Chain Pitch3/8 inch
Chain Gauge0.050 inch
Ignition SystemElectronic
Starter SystemRecoil

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