Case 621 Loader Service Manual (JAK0021700 & Below)


Covers: Case 621 Loader (Serial/PIN JAK0021700 & Below)
Pages: 1,602
Format: PDF download
File size: 515mb
Compatibility: Windows/Mac computers
Notes: Instant digital download only – no printed copy or CD-ROM media.

Latest edition. The Case 621 service manual for serial numbers JAK0021700 and earlier includes comprehensive maintenance, service and repair procedures, and troubleshooting steps for the wheel loader. This service manual has over 1,600 illustrated pages of technical information for mechanics. View the service manual on your tablet, phone or computer and save time and money on repairs.

Machines before PIN JAK0020901 have Clark transmissions. Machines with PIN JAK0020901 to JAK0021700 have ZF transmissions. For ZF 4WD150 trans. repair, refer to separate manual from the manufacturer.

For serial numbers JAK0021701 and above, click here.



  • Standard Torque Specs
  • Fluids and Lubricants
  • Detailed Engine Specifications


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


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


  • Specifications, Schematics, Troubleshooting, and Using Booster
  • Batteries to Start the Engine
  • Starter and Starter Solenoid – Nippondenso
  • 45 or 65 Amp Alternator – Bosch
  • Batteries
  • Instrument Cluster


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


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


  • 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

Have any questions or need more details? Contact Us

SKU: CASE-621EARLY-SM Categories: , Tag:

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