Part of the Case Repair Manuals.
This is the combined Case factory service manual for the 621F and 721F Tier 4 wheel loaders, covering both the full repair procedures and the operator content. It is organized into the standard Case system groups, Engine, Transmission, Four-Wheel Drive, Front and Rear Axles, Brakes, Hydraulic Systems, Steering, Wheels, Cab Climate Control, Electrical Systems, and Platform and Cab. Each group carries specifications, troubleshooting, and step-by-step removal, disassembly, inspection, assembly, and installation procedures for these Tier 4 Final machines, including the powershift transmission, the variable displacement hydraulics, and the engine and transmission control systems, for both the 621F and 721F.
What's Inside This Case 621F, 721F Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine | Engine and Crankcase, Air Cleaners and Lines, Engine Lubrication System, Aftercooler, Engine Cooling System, Fan and Drive, Selective Catalytic Reduction (SCR) Exhaust Treatment, Engine Generic Sub-Group (10.AAA) | |
| Transmission | Powershift Transmission, Powershift Transmission External Controls, Powershift Transmission Internal Components | |
| Four-Wheel Drive (4WD) System | Drive Shaft | |
| Front Axle System | Powered Front Axle, Front Bevel Gear Set and Differential, Final Drive Hub, Steering Knuckles, And Shafts | |
| Rear Axle System | Powered Rear Axle, Rear Bevel Gear Set and Differential, Planetary and Final Drives | |
| Brakes and Controls | Hydraulic Service Brakes | |
| Hydraulic Systems | Variable Displacement Pump, Pilot System, Main Control Valve, Auxiliary Hydraulic Valves and Lines, Front Loader Arm Hydraulic System | |
| Steering | Auxiliary Steering | |
| Wheels | Front Wheels | |
| Cab Climate Control | Air Conditioning | |
| Electrical Systems | Electrical System, Fuel Tank System, Engine Cooling System, Engine Control System, Service Brake Electrical System, Parking Brake Electrical System, Hydraulic System Control, Steering Control System, Heating, Ventilation, And Air-Conditioning (HVAC) Control System, Cab Heating, And Air-Conditioning (HVAC) Controls, Harnesses and Connectors, Engine Starting System, Cold Start Aid, Alternator, Battery, External Lighting, External Lighting Switches and Relays, Warning Indicators, Alarms, And Instruments, Loader Arm and Bucket Control System, Cab/Platform Harnesses and Connectors, Cab Controls, Cab Lighting, Wiper/Washer System, Cab Brake Controls, Cab Controls (Lift Arm, Boom, Dipper, Bucket), Selective Catalytic Reduction (SCR) Electrical System, Fault Codes (55.DTC) | |
| Platform, Cab, Bodywork, and Decals | Pneumatically-Adjusted Operator Seat, Cab |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine oil | Case Akcela Engine Oil 15W-40 | |
| Coolant mixture | 50% ethylene glycol / 50% water | |
| Transmission | Powershift with external controls | |
| Drive | Four-wheel drive, powered front and rear axles | |
| Hydraulics | Variable displacement pump with pilot system and main control valve |
Case 621F, 721F Common Problems This Manual Covers
Machine revs but will not move, or drops into transmission shutdown or stop mode
Follow the Transmission and Electrical troubleshooting. Confirm the transmission oil level and filter condition first, since a low level or restricted filter commonly triggers a shutdown, then use the powershift external-controls and engine and transmission control-system diagnostics to read the active fault and verify the forward-neutral-reverse control and the hydraulic control-valve solenoids before any teardown.
Manual Section: TransmissionSlow or weak hydraulics affecting the loader and steering together
Use the Hydraulic systems group. Check the variable displacement pump output, the pilot system pressure, and the main control valve against the specifications before replacing parts, because a pump or pilot-pressure fault slows every hydraulic function at once. The steering auxiliary circuit is covered separately if only steering is affected.
Manual Section: Hydraulic systemsEngine overheating or coolant and lubrication faults
Use the Engine group for the lubrication system and aftercooler and the Electrical systems group for the engine cooling system. Verify the 50/50 coolant mixture and the Case Akcela 15W-40 oil, inspect the cooling package and aftercooler for restriction, and follow the control-system checks for the cooling fan and sensors.
Manual Section: EngineFrequently Asked Questions
My 621F or 721F revs but will not drive, or drops into transmission shutdown. Where do I start?
Work the Transmission and Electrical systems groups. This is a Tier 4 powershift machine, so check the transmission oil level and filter first (a low level or clogged filter is a common trigger), then use the powershift external controls and the engine and transmission control system diagnostics to read the fault and check the forward-neutral-reverse control and control-valve solenoids before removing anything.
Which engine and emissions system does this cover?
These are Tier 4 Final Case wheel loaders, and the Engine group covers the engine and crankcase, air cleaners and lines, the lubrication system, and the aftercooler, along with the engine cooling and control systems in the Electrical group. Use the specified Case Akcela 15W-40 oil and the 50/50 coolant mixture called out in the manual.
The loader hydraulics are slow or the machine is hard to steer. What should I check?
The Hydraulic systems group covers the variable displacement pump, the pilot system, and the main control valve, and the Steering group covers the auxiliary steering circuit. Check pump and pilot pressures against spec before replacing a valve, since a pilot or pump fault will slow every hydraulic function at once.
Does this include both the repair and the operator information?
Yes. This is the combined Case service manual for the 621F and 721F, covering the full repair and service procedures for every system group plus the operator content, so setup, controls, and maintenance are documented alongside the teardown and troubleshooting.
What axle and drivetrain service is covered?
The Four-Wheel Drive, Front axle, and Rear axle groups cover the drive shaft, the powered front and rear axles with their bevel gear sets and differentials, and the planetary and final drives. The Transmission group covers the powershift transmission and its external controls, so the complete driveline is documented.
How will I receive this Case 621F, 721F Repair Manual?
Instant PDF download (189 MB). You get the full 2648-page searchable Repair Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this Case 621F, 721F Repair Manual?
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