The Tigercat 620C Skidder is a heavy-duty forestry machine designed for efficient and safe timber extraction. This service manual, issued in April 2008, provides comprehensive information for the maintenance, repair, and operation of the 620C Skidder, covering serial numbers 6200501 to 6205000. It is an essential resource for dealers, customers, and operators to ensure optimal machine performance and longevity.

Function Description:

The Tigercat 620C Skidder's primary function is to transport felled trees (logs) from the felling site to a landing or processing area. This is achieved through its powerful drive system, robust grapple, arch, and boom, or an optional winch and dozer blade. The machine is engineered to operate in challenging off-road conditions typical of logging environments, providing high productivity and reliability. Its design emphasizes operator safety and comfort, with advanced control systems for precise handling of logs.

Important Technical Specifications:

The manual highlights a critical distinction in the electrical systems based on the machine's serial number:

Earlier Machines (6200501 to 6200900): These models feature a 12 VOLT ELECTRICAL SYSTEM.
Later Machines (6200901 to 6205000): These models are equipped with a 24 VOLT ELECTRICAL SYSTEM. This difference is crucial for troubleshooting, parts ordering, and electrical system maintenance.

The machine's structural integrity is certified to meet SAE standards for operator protection:

ROPS (Roll-Over Protection Structures) SAE J1040 (MAY94): Ensures operator safety in the event of a rollover.
FOPS (Falling Objects Protection Structures) SAE J231 (JAN81): Protects the operator from falling objects.
OPS (Operator Protection Structures) SAE J1084 (APR80): Provides general operator protection.

The MAXIMUM GROSS WEIGHT for the Tigercat Model 620/630 is specified as 47,000 lbs., with a MANUFACTURERS CERTIFICATION NO. 901099. This weight limit is vital for safe operation and adherence to transport regulations.

Usage Features:

The Tigercat 620C Skidder is designed for ease of use and efficient operation, as detailed in the separate Operator's Manual. Key usage features include:

Controls and Operation: Comprehensive information on machine controls, including steering, drive, brakes, and the operation of the grapple, arch, boom, winch, and dozer blade.
Engine Start and Stop: Detailed procedures for safely starting and shutting down the engine, crucial for both routine operation and emergency situations.
Drive System: Information on the machine's drive capabilities, allowing operators to navigate varied terrain and efficiently transport logs.
Brakes: Descriptions of the braking system, ensuring effective stopping power and control, especially when carrying heavy loads.
Steering and Center Joint: Details on the articulated steering system, which provides excellent maneuverability in tight spaces and challenging forest environments.
Grapple, Arch, and Boom: Instructions for operating the primary log-handling components, including techniques for grabbing, lifting, and positioning logs.
Winch: For models equipped with a winch, the manual covers its operation for pulling logs from difficult-to-reach areas.
Dozer Blade: For models with a dozer blade, its use for clearing paths, leveling ground, or assisting in log piling is described.
Axles and Differential Locks: Information on the robust axle system and differential locks, which enhance traction and stability in slippery or uneven conditions.

The manual emphasizes that only trained personnel should operate the machine, highlighting the importance of understanding all controls and safety procedures.

Maintenance Features:

The service manual is a critical tool for maintaining the Tigercat 620C Skidder, ensuring its reliability and extending its lifespan. Key maintenance features include:

Lubrication and Maintenance Schedule: A detailed schedule outlining routine lubrication points and maintenance tasks, essential for preventing wear and tear.
Electrical and Computers: Comprehensive information on the electrical systems (12V or 24V, depending on the model) and onboard computer systems, including troubleshooting guides and wiring diagrams. This section is vital for diagnosing and repairing electrical faults.
Oil Cooler and Fan: Maintenance procedures for the oil cooler and fan system, which are crucial for maintaining optimal operating temperatures of hydraulic fluids and engine oil.
Safety Guidelines: Section 1 of the manual provides extensive safety information that must be followed during all maintenance and repair procedures. This includes warnings and cautions displayed throughout the manual to draw attention to potential hazards.
Non-Approved Field Product Changes: A strict policy against unauthorized modifications or additions to the machine. Tigercat emphasizes that any changes not approved by the company can compromise the product's integrity, stability, and safety, and will void warranties and certifications. This policy underscores the importance of using genuine Tigercat parts and approved service procedures.
ROPS, FOPS, OPS Modifications and Repairs: Specific warnings regarding modifications or repairs to the protective structures. Any alteration can seriously affect the structure's ability to provide protection, and such modifications will void the certification. Tigercat explicitly states that straightening a deflected structure, especially with heat, can further reduce its protective capability, necessitating replacement.
Available Literature: The manual lists other essential documents, including the Operator's Manual (English and Spanish) and Parts Catalog (English), which are crucial for complete machine management.

Tigercat Industries Inc. maintains an ongoing improvement process for its machines, and the manual advises contacting a Tigercat dealer for the latest information if there are discrepancies with the manual's release date. The company reserves the right to make changes to the machine after the manual's release date without immediate updates in the manual. This highlights the dynamic nature of product development and the need for operators and technicians to stay informed through official channels.

Tigercat 620C - Page 2

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