Case 621B 721B Loader Service Manual (7-60064)

Case 621B, 721B Loader Service Manual (7-60064)

This comprehensive service manual provides full technical coverage for Case 621B and 721B loaders, including complete engine overhaul procedures, power train servicing, hydraulic system diagnostics, steering repairs, brake servicing, electrical schematics, chassis components and loader structures. It includes step by step removal and installation instructions, detailed specifications, pressure and performance checks, troubleshooting information and workshop level procedures for deep maintenance and full machine restoration.

Model Covers:

Case 621B Loader
Case 721B Loader

File Format: PDF

Size: 411.30 MB

No. of pages: 1862

Language: English

Delivery Method: Instant Download - Access your file immediately after purchase.

General Information

• Standard torque specifications for service fasteners
• Approved fluids and lubricants for major machine systems

Engines - 621B 6T-590 and 721B 6T-830

• Engine removal and installation procedures for 621B loaders
• Engine removal and installation procedures for 721B loaders
• Radiator removal and installation for 621B machines
• Radiator removal and installation for 721B machines
• Stall test procedures for power train performance verification

621B - 6T-590 Engine

• Specification details for the 6T-590 engine
• Cylinder head and valve train service procedures
• Cylinder block work including crankshaft, pistons, rods, sleeves, camshaft, bearings, seals and flywheel
• Engine lubrication system checks and service
• Cooling system inspection and component service
• Turbocharger service operations

721B - 6T-830 Engine

• Specification details for the 6T-830 engine
• Cylinder head and valve train maintenance
• Cylinder block service including crankshaft, pistons, rods, sleeves, camshaft, bearings, seals and flywheel
• Engine lubrication system maintenance and checks
• Cooling system inspection and service procedures
• Turbocharger service and turbocharger failure analysis

Fuel System

• Fuel system service operations for 6T-590 engines
• Fuel system service operations for 6T-830 engines
• Fuel filter and system maintenance procedures

Electrical System

• Electrical schematics and troubleshooting procedures for base machines
• Electrical schematics and troubleshooting for units with Auto Shift transmission
• Starter and solenoid service procedures for Nippondenso units on 621B
• Starter and solenoid service procedures for Nippondenso units on 721B
• Battery inspection, service and replacement operations
• Instrument cluster and gauge service procedures
• 65 amp Bosch alternator service and testing

Steering System

• Removal and installation of primary steering components
• Steering specifications and troubleshooting guidelines
• Steering control valve service
• Flow control valve inspection and service
• Steering cylinder disassembly and repair
• Center pivot inspection and service
• Auxiliary steering motor and pump service operations

Power Train

• Removal and installation of main power train components
• Transmission specifications, schematic and troubleshooting for machines without Auto Shift
• Transmission specifications, schematic and troubleshooting for machines with Auto Shift
• Transmission repair procedures for 621B loaders using 4WG150 transmissions
• Transmission repair procedures for 721B loaders using 4WG180 transmissions
• Front and rear axle repair and overhaul
• Drive shaft, center bearing and universal joint service
• Wheels and tires removal, installation and service notes
• Transmission control valve service for units without Auto Shift
• Transmission control valve service for units with Auto Shift

Brake System

• Removal and installation of brake components
• Brake system troubleshooting and service procedures

Hydraulic System

• Removal and installation of hydraulic components
• Hydraulic specifications, circuit schematics, troubleshooting and pressure checks
• Cleaning and decontamination of the hydraulic system
• Hydraulic pump service procedures
• Loader control valve disassembly and inspection
• Hydraulic cylinder service and resealing operations
• Coupler lock valve service for XT loader configurations
• Remote control valve service
• Pressure reducing and sequence valve service

Chassis and Air Conditioning

• Air conditioning troubleshooting and system checks
• Air conditioning troubleshooting procedures for HFC 134a systems
• Air conditioner service including recovery, evacuation and recharging
• Air conditioner service procedures for HFC 134a systems
• Removal and installation of air conditioning components
• Removal and installation of air conditioning components for HFC 134a systems
• Air conditioning compressor and clutch service
• Air conditioning compressor and clutch procedures for HFC 134a systems

Loader, Cab and Controls

• ROPS cab and canopy removal and installation
• Seat and seat belt service and replacement
• Suspension seat service and adjustments
• Pedals and levers service and linkage adjustments
• Cab window replacement procedures

This Case 621B and 721B loader service manual provides structured workshop level information for systematic diagnostics, component repair and complete overhauls across all major machine systems.