Case 621G, 721G Wheel Loader Pdf Repair and Service Manual - Pb. No. 51428265

Case 621G, 721G Wheel Loader PDF Repair and Service Manual – Part No. 51428265

When a CASE 621G or 721G wheel loader develops a hydraulic fault, transmission problem, steering issue, electrical warning, or loader-function problem, the correct repair procedure can make the difference between a controlled workshop job and unnecessary component replacement. The CASE 621G, 721G Wheel Loader PDF Repair and Service Manual – Part No. 51428265 brings the machine's major service systems together in one detailed technical reference.

This Tier 4B (final) Service Manual is the 2nd Edition, English, December 2017 publication and covers the North American 621G and 721G configurations with the new cab and XR-EH, XT-EH, and ZBAR-EH arrangements. The identified engine applications are FPT F4HFE613W*B002 for the 621G and FPT F4HFE613T*B001 for the 721G.

Which 621G and 721G Configurations Are Covered?

Model	Configuration	Engine Application
CASE 621G	XR-EH, New Cab, Tier 4B North America	FPT F4HFE613W*B002
CASE 621G	XT-EH, New Cab, Tier 4B North America	FPT F4HFE613W*B002
CASE 621G	ZBAR-EH, New Cab, Tier 4B North America	FPT F4HFE613W*B002
CASE 721G	XR-EH, New Cab, Tier 4B North America	FPT F4HFE613T*B001
CASE 721G	XT-EH, New Cab, Tier 4B North America	FPT F4HFE613T*B001
CASE 721G	ZBAR-EH, New Cab, Tier 4B North America	FPT F4HFE613T*B001

G-Series Loader Specifications

Specification	621G	721G
Engine	FPT F4HFE613W	FPT F4HFE613T
Displacement	6.7 L	6.7 L
Cylinders	6-cylinder inline	6-cylinder inline
Net Power	162 hp (121 kW)	179 hp (133 kW)
Net Peak Torque	510 lb-ft (692 Nm)	674 lb-ft (914 Nm)
Operating Weight	28,254 lb (12,816 kg)	32,633 lb (14,802 kg)
Full-Turn Tipping Load, ISO Deflected Tires	18,749 lb (8,504 kg)	20,212 lb (9,168 kg)
Breakout Force	30,485 lb (13,828 kg)	35,288 lb (16,007 kg)
Typical General-Purpose Bucket Range	Approximately 3.0 yd³ (2.3 m³)	Approximately 3.5 yd³ (2.7 m³)

These specifications help distinguish the 621G and 721G while the manual itself brings the corresponding engine, transmission, hydraulic, axle, steering, electrical, and loader service information together for the covered North American configurations.

Manual Identification

Manual Detail	Information
Part / Publication Number	51428265
Machine Models	CASE 621G and 721G Wheel Loaders
Emission Configuration	Tier 4B (final)
Edition	2nd Edition
Publication Date	December 2017
Market	North America
Language	English
Format	PDF
Manual Type	Service / Repair Manual
Reference Size	Approximately 3,805 pages / 202.7 MB for the indexed digital edition

A Workshop Reference Built Around the Whole Loader

One of the useful aspects of publication 51428265 is its broad system coverage. A wheel loader repair can move from one system into another very quickly: an engine-related problem may affect performance, a hydraulic issue can influence loader response, and a transmission or axle fault can appear initially as a travel complaint. The manual is organized so these systems can be investigated separately while keeping the complete machine architecture in view.

Manual Section	Primary Service Coverage
Engine	Engine systems, specifications, service procedures, and related checks
Transmission	Transmission components, operation, service, and repair information
Four-Wheel Drive	4WD system components and service procedures
Front Axle	Front axle repair and component information
Rear Axle	Rear axle service and repair information
Brakes and Controls	Brake system and control-related service
Hydraulic Systems	Loader hydraulics, hydraulic components, testing, and service information
Frames and Ballasting	Frame, counterweight, and ballasting information
Steering	Steering system components and service procedures
Wheels	Wheel and related component service
Cab Climate Control	Heating, ventilation, and air-conditioning service information
Electrical Systems	Electrical components, circuits, diagnostics, and related service information
Front Loader and Bucket	Loader linkage, arms, bucket, and associated components
Platform, Cab and Bodywork	Cab, body panels, platform, decals, and related components
Special Tools	Special service-tool index and applicable tool information
Electrical Schematic	Electrical schematic reference

Engine and Powertrain Troubleshooting

The 621G and 721G use six-cylinder 6.7-liter FPT engines, but the two models employ different engine variants and output levels. The manual therefore becomes useful when a technician needs to work beyond basic engine maintenance and into machine-specific service procedures.

For example, an operator may report sluggish acceleration, poor loading performance, abnormal transmission behavior, or an engine-related warning. Instead of assuming that the engine itself is responsible, the service information allows the technician to work through the engine, transmission, 4WD, axle, and control systems that contribute to overall machine performance.

Hydraulic System and Loader Function

Loader performance depends on coordinated hydraulic operation. Problems such as slow lift-arm movement, weak bucket breakout, drifting cylinders, delayed hydraulic response, or abnormal hydraulic noise can have several possible causes.

The hydraulic section of 51428265 provides the technical information needed to investigate the hydraulic system and its components. The manual also has a dedicated Front Loader and Bucket section, making it relevant when the problem is associated specifically with the loader linkage, bucket, lift-arm assembly, or attachment functions.

Transmission, Axles and 4WD Service

A wheel loader that hesitates under load, loses drive, develops abnormal axle noise, or shows inconsistent traction may require inspection beyond the engine compartment. This publication includes dedicated sections for the transmission, four-wheel-drive system, front axle, and rear axle.

That coverage is especially useful for workshop jobs involving drivetrain component removal, inspection, adjustment, reassembly, and troubleshooting where the symptom appears during travel or when the machine is working under load.

Electrical and Electronic Fault Finding

Modern G-Series loaders rely on electrical and electronic systems for monitoring, control, and communication between machine functions. Intermittent electrical faults can be particularly time-consuming when the technician does not have the correct wiring information.

The manual includes a dedicated Electrical Systems section together with an Electrical Schematic. These resources can assist with tracing circuits, identifying affected components, checking connections, and understanding the electrical side of a machine fault before replacing expensive parts.

Steering, Brakes and Operator Controls

Steering and braking faults are operationally significant on a wheel loader because they directly affect machine control. Publication 51428265 includes separate information for brakes and controls as well as the steering system, allowing these areas to be addressed as dedicated service systems rather than treated as general maintenance items.

The cab and platform sections also provide information for work involving the operator environment, bodywork, and related components, while the cab climate-control section addresses heating and air-conditioning service.

Practical Repair Situations

• Loader arms respond slowly: Use the hydraulic and front-loader sections to investigate the loader system rather than immediately replacing a hydraulic component.
• Bucket breakout performance has changed: Review the loader and hydraulic information to determine whether the issue is related to hydraulic operation, linkage, or another machine system.
• The loader loses traction: The transmission, 4WD, front axle, and rear axle sections provide the appropriate areas for drivetrain investigation.
• A warning or electrical fault appears: Use the electrical-system information and schematic to trace the affected circuit and associated components.
• Steering response is abnormal: The dedicated steering section helps direct inspection toward the correct steering components.
• Brake performance changes: The brakes and controls section provides model-specific service information for investigation and repair.
• Cab HVAC stops working correctly: The cab climate-control section provides a dedicated technical reference rather than relying on generic HVAC procedures.
• Major component removal is required: The manual's system-by-system organization helps identify the related components that must be disconnected before disassembly.

What Makes Part No. 51428265 Useful?

This publication is more than a basic maintenance guide. It is structured as a technical service reference for the covered CASE 621G and 721G Tier 4B (final) North American wheel loaders. Its combination of system chapters, service information, schematics, loader sections, and special-tool references makes it useful for both planned component repair and troubleshooting work.

It can help technicians spend less time searching through unrelated information and more time identifying the correct procedure for the exact machine system being serviced.

Digital Manual Features

• English-language PDF service manual
• Searchable digital technical information
• Organized table of contents for faster navigation
• Detailed service procedures and component information
• Electrical schematic reference
• Hydraulic-system information
• Zoom capability for diagrams and illustrations
• Printable pages for workshop reference
• Convenient access from compatible computers, tablets, and mobile devices
• Useful for equipment owners, field mechanics, independent repair shops, and service departments

Frequently Asked Questions

What is CASE manual 51428265?

51428265 is the CASE service manual for the 621G and 721G Tier 4B (final) wheel loaders covered by the North American edition.

Which CASE models are covered by 51428265?

The manual covers the CASE 621G and 721G wheel loaders in XR-EH, XT-EH, and ZBAR-EH new-cab North American configurations identified in the publication.

What engine does the 621G use?

The covered North American 621G configurations use the FPT F4HFE613W*B002 engine application.

What engine does the 721G use?

The covered North American 721G configurations use the FPT F4HFE613T*B001 engine application.

Does the manual include hydraulic repair information?

Yes. Hydraulic systems are a dedicated section, and the manual also contains a separate Front Loader and Bucket section for loader-related service work.

Does 51428265 include transmission and axle information?

Yes. Dedicated sections cover the transmission, four-wheel-drive system, front axle, and rear axle.

Does the manual contain electrical schematics?

Yes. The publication includes an Electrical Systems section and an Electrical Schematic reference.

Does this manual cover steering and brakes?

Yes. Brakes and Controls and Steering are both separate service sections within the manual.

Is this the Tier 4B final version?

Yes. Part No. 51428265 is identified as the 621G/721G Tier 4B (final) Wheel Loader Service Manual, 2nd Edition, English, December 2017.

Is this manual available as a PDF?

Yes. The manual is supplied in digital PDF format for searching, zooming, saving, and printing relevant technical pages.