Case 688 Excavator Service Manual


  • Covers Case 688 excavators
  • P/N 8-66052 or 7-32651
  • Downloadable PDF format
  • Works with Windows/Mac/Tablet/Mobile

The Case 688 service manual includes technical specifications, step-by-step instructions, illustrations and schematics to guide mechanics through mechanical, electrical and hydraulic repairs. The service manual was digitally reproduced from the original dealer manual into a clear, searchable PDF format and is ideal for mechanics repairing or overhauling the Case 688 crawler excavator. In addition to all machine systems, engine/fuel repair information is included. This manual can be downloaded instantly to your computer, tablet or smartphone.

Two separate manuals are available for the 688, depending on your machine’s serial number (11600 & Before or 11601 & After). Please confirm and select from the drop-down menu above.



  • Safety Rules, General Information and Torque Specifications
  • Machine Specifications
  • Engine Specifications


  • Engine and Radiator Removal and Installation
  • Engine Accessories
  • Cylinder Head and Valve Train
  • Cylinder Block, Pistons, Rods, Camshaft, Main Bearings, Oil Seals, and Flywheel
  • Lubrication System
  • Cooling System
  • Turbocharger
  • Turbocharger Failure Analysis


  • Fuel Lines, Fuel Tank, and Engine Controls
  • Fuel System and Filters
  • Fuel Injection Pump and Drive Gear
  • Fuel Injectors


  • Removal and Installation of Electrical Components
  • Electrical Specifications and Troubleshooting
  • Electrical Schematic
  • Batteries
  • Starter and Starter Solenoid
  • Alternator


  • Removal and Installation of Track Components
  • Troubleshooting
  • Track Chain and Shoes
  • Track Rollers, Idler, and Sprocket


  • Removal and Installation of Power Train Components
  • Maintenance
  • Drive and Swing Motor
  • Final Drive Transmission
  • Swing Transmission


  • Removal and Installation of Hydraulic Components
  • Maintenance and Service
  • Specifications and Troubleshooting
  • High Pressure Pump
  • Low Pressure Hydraulic Pump
  • Attachment Control Valve
  • Drive Control Valve
  • Control Valve for Options
  • Solenoid Control Valve and Swing Brake Release Valve
  • Swing Control Valve
  • Hydraulic Swivel
  • Hand Control Valve
  • Foot Control Valve
  • Hydraulic Hammer Control Valve
  • Variator
  • Selector Block
  • Cylinders


  • Boom, Arm, and Tool
  • Turntable Bearing and Related Parts


  • Electrical Schematics (Wiring Diagrams)
  • Hydraulic Schematics

Example Service Manual PDF Download

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If you have any questions regarding this manual, please contact us and reference the title or SKU.

SKU: CASE-688-SM Categories: , Tag:


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