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Yanmar Saildrive Unit SD20, SD30, SD31 service manual Preview image 1
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Yanmar Saildrive Unit SD20, SD30, SD31 service manual

Models covered in this manual:

Yanmar Saildrive Unit

  • SD20
  • SD30
  • SD31

Serial numbers:

  • For the SD20: E02710 and up
  • For the SD30: E13702 and up
  • For the SD31: E13702 and up

File specifications

File size: 18.60 MB
File type: PDF
Language: English

Printable: Yes
Estimated download time: 0.38 Minutes
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Product Information

Table of Contents

Sail Drive Unit SD20, SD30 & SD31

Chapter 1 General

  • Specifications 1-1
  • Selected View & Names of Parts 1-2
  • Sectional View & Name of Parts 1-3
  • Procedure for Rigging Engine 1-4
  • Procedure for Replacing Propellers 1-5
  • General Instructions 1-6
  • Cautionary and Prohibitory Tools 1-7
  • General Information 1-8
  • Special Tools 1-9
  • Tightening Torques 1-10
  • How to Read Circuits 1-11
  • Ad On (Disassembly, Inspection and Reassembly) 1-12

Chapter 2 Disassembly

  • Disassembling the Upper Gear Case 2-1
  • Disassembling the Lower Gear Case 2-2

Chapter 3 Reassembly

  • Reassembling the Upper Gear Case Assembly 3-1
  • Reassembling the Lower Gear Case Assembly 3-2
  • Installing the Propeller Shaft 3-3
  • Fitting the Folding Propeller 3-4

Chapter 4 Gear Adjustment (Gear Backlash)

  • Adjusting the Upper Gear Backlash 4-1
  • Adjusting the Lower Gear Backlash 4-2
  • Adjusting the Drive Gear Backlash 4-3
  • Adjusting the Pinion Gear Backlash 4-4
  • Adjusting the Idler Gear Backlash 4-5

Chapter 5 Bearing & Oil Seal Replacement

  • Replacing the Upper Gear & Pinion Bearing 5-1
  • Replacing the Lower Gear & Pinion Bearing 5-2
  • Replacing the Propeller Shaft Oil Seal 5-3
  • Replacing the Lower Gear Oil Seal 5-4
  • Replacing the Idler Gear Oil Seal 5-5

Chapter 6 Tightening Torques for Nuts and Bolts

  • Specified Tightening Torques 6-1

Chapter 7 Electrical Wiring

  • Reading the Electrical Wiring Diagrams 7-1
  • Electrical Wiring Diagram 7-2

Chapter 8 Inspecting the Long-Reach Unit

  • General Inspection 8-1
  • Modification Method 8-2

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