Case 621G, 651G, 721G, 821G, 921G Wheel Loader Operators Manual (92214904) (October 2025)

These G‑series loaders usually live in rough spots—quarries, feed yards, snow work, pipe jobs—where you’re cycling buckets all day in dust, mud, or frozen slop. This operators manual helps you run the machine the way it was meant to be run: what each control really does, how it reacts under load, and the daily checks that keep you working instead of waiting on a service truck. Picture backing up on a slick stockpile, trying to feather the throttle and brake so you don’t spin or stall—this is the book that explains how the transmission, brakes, and hydraulics are supposed to behave so you can trace issues and adjust your habits.

Applications & Use Cases

• Set up the seat, steering, and display so you can see your edges, reach every control, and stay steady on long shifts.
• Learn how to route and adjust the bucket and boom functions for smoother cycles when you’re loading trucks on uneven ground.
• Follow the daily walk‑around to inspect hoses, check fluids, verify lights, and spot leaks before they strand you.
• Use the procedures to isolate odd noises or warning lights, then test simple things yourself before calling a tech.
• Understand how to work on slopes, brake correctly, and bleed off hydraulic pressure safely before you crack a line or pull a quick‑coupler hose.

FAQ

Q: Is this a PDF I can search on my laptop or phone?

A: Yes, it’s typically a searchable PDF, so you can jump to fault codes or control info by keyword.

Q: Can I print just the pages I need for the jobsite?

A: Usually yes; most folks print the safety, daily checks, and hydraulic diagrams so they can get them dirty without worrying.

Safety Note

Always verify the engine’s off, parking brake set, and hydraulic pressure fully released before you inspect or disconnect any attachment or hose.

Case 621G, 651G, 721G, 821G, 921G Wheel Loader Index:

• GENERAL INFORMATION
  • Note to the owner
  • Intended use
  • Electro-Magnetic Compatibility (EMC)
  • Metric and imperial units abbreviations
  • Product identification
  • Operator’s manual storage on the machine
  • Machine orientation
  • Identification of machine components
• SAFETY INFORMATION
  • Safety rules and signal word definitions
  • Personal safety
  • Safety rules
  • Seat belts
  • Support strut and service link
  • Utility safety
  • Ecology and the environment
  • Hand signals
  • Safety signs
• CONTROLS AND INSTRUMENTS
  • Access to operator’s platform
    • Proper entry and exit
  • Operator’s seat
    • Overview
  • Forward controls
    • Front console
    • Steering column
    • Pedal controls
    • Joystick steering
  • Right-hand side controls
    • Overview
    • Multifunction keypad
    • Control lever operation
    • Parking brake
    • Arm pad
  • Exterior controls
    • Hood and Timed Disconnect Switches
  • Display
    • Display description
    • Status and warning icons
  • Climate controls
    • Climate controls
    • Cab air louvers
  • Windows
    • Windows
  • Internal cab lights
    • Cab lights
    • Courtesy Lights
• OPERATING INSTRUCTIONS
  • Commissioning the unit
    • Before starting the engine
  • Starting the unit
    • Starting the engine
    • Operating in extreme temperatures
    • Operating the machine
  • Stopping the unit
    • Stopping the machine
  • Moving the unit
    • Enabling the Auxiliary F-N-R switch
    • Ride control
    • Control levers
    • Auxiliary forward, neutral, reverse (F-N-R) switch
    • Transmission automatic mode
    • Throttle set
    • Loader functions
    • Parallel Lift
• TRANSPORT OPERATIONS
  • Road transport
    • Safety rules
  • Recovery transport
    • Transporting the machine
    • Traveling on public roads
    • Moving a disabled machine
• WORKING OPERATIONS
  • Loader operations
    • Operating tips
    • Changing loader attachments
    • Coupling the attachment
    • Uncoupling the attachment
    • Joystick steering operation
    • Payload
    • Auto Dig, Auto Dump and Auto Metering features
• MAINTENANCE
  • General information
    • Servicing
    • Remote Service Tool (RST)
    • Releasing pressure in the hydraulic system
    • General specification – Diesel fuel
    • General specification – Paraffinic (Diesel) Fuels
    • Biodiesel
    • Fluids and lubricants
    • Engine cooling system
    • Automatic lubrication system (if equipped)
    • Selective Catalytic Reduction (SCR) – Overview
    • Selective Catalytic Reduction (SCR) system
  • Maintenance planning
    • Maintenance chart
  • Daily inspection
    • Daily inspection
  • Every 10 hours
    • Engine oil level – Check
  • Every 50 hours
    • Bucket/attachment fittings – Grease
    • Machine fittings – Grease
    • Hydraulic oil level – Check
    • Transmission oil level – Check
    • Engine coolant level – Check
  • Initial 100 hours
    • Wheel nuts tightening – Check
    • Selective Catalytic Reduction (SCR) in-line filter (Initial) – Remove and Discard
    • Engine oil (Initial) – Change
    • Engine oil filter (Initial) – Replace
    • Fuel pre-filter (Initial) – Replace
    • Fuel filter (Initial) – Replace
    • Hydraulic oil filter (Initial) – Replace
    • Front and rear axle oil (Initial) – Change
  • Every 100 hours
    • Machine fittings – Grease
  • Initial 250 hours
    • Transmission Clutch (Initial) – Calibrate
  • Every 250 hours
    • Drive shaft slip joints – Grease
    • Cab air recirculation filter – Cleaning
    • Cab air pre-filter – Cleaning
    • Cab air filter – Cleaning
    • Wheels – Tire inflating
    • Drive belts – Check
    • Parking brake – Check
    • Auxiliary steering – Check
  • Every 500 hours
    • Engine oil – Change
    • Engine oil filter – Change
    • Fuel pre-filter – Replace
    • Fuel filter – Replace
    • Fuel tank sediment – Drain
    • Front and rear axle oil level – Check
    • Roll Over Protective Structure (ROPS) – Check
    • Battery fluid level – Check
    • DEF/AdBlue® tank vent filter – Replace
  • Every 1000 hours
    • Pivot points – Grease
    • Water from hydraulic system – Drain
    • Drive belt – Replace
    • Cab air recirculation filter – Replace
    • Cab air pre-filter – Replace
    • Cab air filter – Replace
    • Engine breather filter – Replace
    • Front and rear axle oil – Change
    • Alternator – Check
    • Starter motor – Check
  • Every 2000 hours
    • Transmission oil – Change
    • Transmission oil filter – Replace
    • Transmission breather – Cleaning
    • Transmission Clutch – Calibrate
    • Hydraulic oil filter – Replace
    • Primary engine air filter – Replace
    • Secondary engine air filter – Replace
    • Frame and cab – Lubricate
    • Engine valve clearance – Check and adjust
  • Every 3000 hours
    • Cold weather hydraulic oil – Change
  • Every 4000 hours
    • Supply module filter – Replace
    • Diesel Exhaust Fluid (DEF)/AdBlue® tank suction filter – Cleaning
    • Standard weather hydraulic oil – Change
    • Engine coolant – Change
  • As required
    • Fuel pre-filter – Drain fluid
    • DEF/AdBlue® tank neck filter – Cleaning
    • Urea Quality Sensor (UQS) – Replace
    • Diesel Exhaust Fluid (DEF)/AdBlue® tank suction filter – Replace
    • Air conditioning condenser – Cleaning
    • Cab service – Check
    • Windshield washer fluid level – Check
    • DEF/AdBlue® tank – Drain
    • DEF/AdBlue® tank – Refill
  • Electrical system
    • Battery – Cleaning
    • Battery electrolyte level – Check
    • Auxiliary battery connections – Check
    • Battery – Replace
    • Fuses and relays – Replace
    • Lights – Replace
  • Storage
    • Preparation
    • Every 30 days
    • Every 4 months
    • Removal
• SPECIFICATIONS
  • General specifications
  • Machine specifications and dimensions
  • Torque
  • Material weights
• ACCESSORIES
  • General accessories
  • Telematics

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