Case 621 Loader Service Manual (JAK0021701 & Up)


Covers: Case 621 Loader with PIN JAK0021701 & Up
Pages: 1,381
Format: PDF download
File size: 515mb
Compatibility: Windows/Mac/Tablet/Smartphone
Notes: Instant digital download only – no printed copy or CD-ROM media.

The Case 621 Loader Service Manual for serial numbers JAK0021701 and above covers comprehensive maintenance, service and repair procedures, and troubleshooting steps for the wheel loader. This service manual has over 1,300 illustrated pages of technical information for mechanics. View the service manual on your tablet, phone or computer and save time and money on repairs.

Latest edition. For serial numbers JAK0021700 and below, click here.



  • Standard Torque Specs
  • Fluids and Lubricants


  • Engine and Radiator Removal and Installation
  • Stall Tests
  • Cylinder Head and Valve Train
  • Specification Details
  • Cylinder Block, Pistons, Rods, Camshaft, Main Bearings, Oil Seals, and Flywheel
  • Lubrication System
  • Cooling System
  • Turbocharger


  • Fuel System and Filters
  • Fuel Injection Pump
  • Fuel Injectors


  • Removal and Installation of Starter and Alternator
  • Specifications, Schematics (Wiring Diagrams), Troubleshooting and Using Booster Batteries to Start the Engine
  • Starter and Starter Solenoid – Nippondenso
  • Batteries
  • Instrument Cluster and Gauges
  • 65 Amp Alternator


  • Removal and Installation of Steering Components
  • Steering Troubleshooting and Pressure Check
  • Steering Control Valve
  • Flow Control Valve
  • Steering Cylinder
  • Center Pivot
  • Auxiliary Steering Pump and Motor


  • Removal and Installation of Components .
  • Transmission Specifications and Troubleshooting (ZF Transmission)
  • Transmission Repair
  • Differential and Planetary Repair
  • Drive Shafts, Center Bearing and Universal Joints
  • Wheels and Tires
  • Transmission Control Valve


  • Removal and Installation of Brake Components
  • Specifications, Schematic, Troubleshooting, Leakage Tests and Adjustments
  • Air Compressor and Governor
  • Brake Valve
  • Brake Actuator
  • Pressure Reducing Valve and Pressure Protection Valve
  • Parking Brake
  • Disc Brakes
  • Air Dryer


  • Removal and Installation of Components
  • Hydraulic Specifications, Schematics, Troubleshooting, and Pressure Checks
  • Cleaning the Hydraulic System
  • Hydraulic Pump
  • Loader Control Valve
  • Cylinders
  • Remote Control Valves
  • Pressure Regulator Valve and Accumulator


  • Air Conditioning Troubleshooting and System Checks
  • Discharging and Charging the Air Conditioning System
  • Removal and Installation of Air Conditioning Components
  • Compressor and Clutch
  • Loader
  • ROPS Cab and ROPS Canopy
  • Seats and Seat Belts
  • Suspension Seat
  • Pedals and Levers

Example content (actual manual may vary):

Case Dozer Service Manual Sample

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