Bobcat 641, 642, 643 Skid Steer Loader Operation and Maintenance Manual

1. Introduction

This manual provides detailed instructions for the safe operation and proper maintenance of Bobcat 641, 642, and 643 series skid steer loaders. Adhering to the guidelines presented herein is crucial for ensuring operator safety, maximizing machine performance, and extending the service life of your equipment. Please read this manual thoroughly before operating or performing any maintenance on your Bobcat skid steer loader.

This manual covers all serial numbers for the Bobcat 641, 642, and 643 models.

Figure 1: Cover of the Bobcat 641, 642, 643 Operation and Maintenance Manual. This image displays the spiral-bound manual with the Bobcat logo and an illustration of a skid steer loader, indicating its purpose as an operational guide for the specified models.

2. Safety Information

Operating heavy machinery like a skid steer loader requires strict adherence to safety protocols to prevent injury or damage. Always prioritize safety by following these general guidelines:

• Read and Understand: Familiarize yourself with all safety decals on the machine and the safety section of this manual before operation.
• Operator Training: Ensure all operators are properly trained and qualified to operate the Bobcat skid steer loader.
• Personal Protective Equipment (PPE): Always wear appropriate PPE, including hard hat, safety glasses, hearing protection, and sturdy footwear.
• Machine Inspection: Perform a pre-operation inspection before each use to check for any damage, leaks, or malfunctions.
• Work Area Safety: Keep bystanders away from the work area. Be aware of your surroundings, including overhead obstacles and uneven terrain.
• Safe Operation: Operate the machine at a safe speed, maintain control, and avoid sudden movements. Never carry passengers.
• Maintenance Safety: Always shut off the engine, engage the parking brake, and lower attachments to the ground before performing any maintenance or adjustments.

3. Product Overview

The Bobcat 641, 642, and 643 series skid steer loaders are versatile machines designed for various tasks in construction, landscaping, agriculture, and other industries. These compact loaders are known for their maneuverability and ability to handle a range of attachments, making them indispensable tools for many operations.

Key features typically include a robust chassis, powerful engine, hydraulic system for attachment operation, and an operator's cab designed for visibility and control. Understanding the basic components and their functions is essential for effective and safe use.

4. Setup and Controls Familiarization

Before operating your Bobcat skid steer loader, it is important to familiarize yourself with its controls and ensure the machine is properly prepared for use.

4.1 Initial Checks

• Verify fluid levels (engine oil, hydraulic fluid, coolant).
• Check tire pressure and condition.
• Inspect all hoses and connections for leaks or damage.
• Ensure all safety guards and decals are in place and legible.

4.2 Operator Controls

The operator's cab contains various controls for steering, lifting, tilting, and operating attachments. Refer to the detailed diagrams within the full manual for precise locations and functions of:

• Steering levers/joysticks
• Lift and tilt controls
• Throttle control
• Parking brake
• Ignition switch
• Auxiliary hydraulic controls (if equipped)

5. Operating Procedures

Safe and efficient operation of your Bobcat skid steer loader involves understanding proper starting, driving, and attachment usage techniques.

5.1 Starting the Engine

1. Ensure the parking brake is engaged and controls are in neutral.
2. Insert the key and turn to the 'ON' position.
3. Check instrument panel for warning lights.
4. Turn the key to 'START' and release once the engine fires.

5.2 Driving and Maneuvering

• Use steering levers/joysticks to control direction and speed.
• Always drive with the heaviest end of the loader uphill when traversing slopes.
• Maintain a clear line of sight. If visibility is obstructed, proceed with caution or reposition.

5.3 Using Attachments

Refer to specific attachment manuals for detailed operating instructions. Always ensure attachments are securely mounted and compatible with your Bobcat model.

6. Maintenance Schedule and Procedures

Regular maintenance is critical for the longevity and reliable performance of your Bobcat skid steer loader. Follow the recommended service intervals and procedures outlined below.

6.1 Daily / Every 10 Hours

• Check engine oil level.
• Check hydraulic fluid level.
• Inspect air cleaner indicator.
• Check coolant level.
• Inspect tires for damage and proper inflation.
• Clean debris from radiator and oil cooler.

6.2 Every 50 Hours / Weekly

• Lubricate pivot points and grease fittings.
• Check battery electrolyte level and terminals.
• Inspect drive chains and adjust tension if necessary.

6.3 Every 250 Hours / Monthly

• Change engine oil and filter.
• Replace fuel filter.
• Inspect fan belt tension and condition.

For detailed instructions on each maintenance task, including specific fluid types and capacities, refer to the comprehensive maintenance section of the full manual.

7. Troubleshooting Common Issues

This section provides guidance on identifying and resolving common operational problems. For complex issues, always consult a qualified Bobcat service technician.

7.1 Engine Does Not Start

• Check Fuel Level: Ensure there is sufficient fuel in the tank.
• Battery: Verify battery connections are clean and tight, and the battery is charged.
• Safety Interlocks: Confirm all safety interlocks (seat bar, parking brake) are engaged correctly.

7.2 Loss of Hydraulic Power

• Hydraulic Fluid Level: Check the hydraulic fluid reservoir and add fluid if low.
• Filter: Inspect the hydraulic filter for clogging.
• Hoses/Connections: Look for visible leaks or damaged hoses.

7.3 Overheating

• Coolant Level: Check the engine coolant level.
• Radiator/Cooler: Clean any debris from the radiator and oil cooler fins.
• Fan Belt: Inspect the fan belt for proper tension and condition.

8. Specifications

Below are general specifications for the Bobcat 641, 642, and 643 series. Specific values may vary slightly by model year and configuration. Always refer to your machine's data plate for exact specifications.

9. Support and Resources

For further assistance, parts, or service, it is recommended to contact an authorized Bobcat dealer. They can provide expert advice, genuine Bobcat parts, and professional service to keep your equipment running efficiently.

Always refer to the complete printed manual for comprehensive diagrams, detailed procedures, and specific safety warnings relevant to your exact machine configuration.