Bobcat 631 Skid Steer Loader Service Manual (Chassis)

1. Introduction and Overview

This service manual provides detailed instructions and procedures for the maintenance, repair, and overhaul of the Bobcat 631 Skid Steer Loader chassis. It is intended for qualified service technicians and personnel familiar with heavy equipment repair practices. Adherence to the procedures outlined in this manual is crucial for ensuring the safe and efficient operation of the machine.

The manual is organized into sections covering various components and systems of the chassis, including preventive maintenance, safety guidelines, engine service, and general repair procedures. Always refer to the latest version of this manual and any supplementary service bulletins.

Figure 1.1: Front cover of the Bobcat 631 Skid Steer Loader Service Manual, indicating coverage for models 630, 631, and 632.

2. Safety Information

Safety is paramount when performing any service or maintenance on the Bobcat 631 Skid Steer Loader. This section outlines critical safety warnings and precautions to prevent injury to personnel and damage to the equipment.

2.1 General Safety Rules

• Always wear appropriate personal protective equipment (PPE), including safety glasses, gloves, and protective footwear.
• Ensure the machine is turned off, parked on a level surface, and the parking brake is engaged before beginning any work.
• Relieve hydraulic pressure before disconnecting hydraulic lines or components.
• Never work under a raised loader arm without proper support devices.
• Keep the work area clean and well-lit.

Figure 2.1: A page from the manual illustrating correct and incorrect safety practices during maintenance. Examples include proper lifting, cleaning, and avoiding working under unsupported loads.

2.2 Warning Symbols

Pay close attention to warning symbols throughout this manual. They indicate potential hazards that could result in serious injury or death if not avoided.

• WARNING: Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
• CAUTION: Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• NOTE: Provides important information or tips for efficient procedures.

3. Preventive Maintenance

Regular preventive maintenance is essential for the longevity and optimal performance of your Bobcat 631 Skid Steer Loader. This section details routine checks and service intervals.

3.1 Serial Number Identification

It is important to correctly identify the loader's serial number and engine serial number for parts ordering and service records. These numbers are typically located on specific plates on the machine.

Figure 3.1: Illustrations showing the typical locations for the loader serial number plate and engine serial number plates (e.g., Wisconsin, Ford, Deutz) on the Bobcat 631 Skid Steer Loader.

3.2 Daily Checks

• Check engine oil level.
• Inspect hydraulic fluid level.
• Check coolant level.
• Inspect tires for damage and proper inflation.
• Verify all lights and safety devices are operational.

3.3 Service Intervals

4. Engine Service

This section provides detailed procedures for servicing the engine components of the Bobcat 631 Skid Steer Loader. Proper engine maintenance is vital for performance and longevity.

4.1 Rear Door Access

Accessing the engine compartment often requires opening or removing the rear door. Ensure the door is properly secured or removed according to safety guidelines.

Figure 4.1: Diagrams illustrating the process of releasing the rear door and installing a door stop for safe engine access on the Bobcat 631 Skid Steer Loader.

4.2 Engine Oil and Filter Change

1. Warm up the engine to operating temperature.
2. Park the loader on a level surface and engage the parking brake.
3. Place a suitable drain pan under the engine oil drain plug.
4. Remove the drain plug and allow the oil to drain completely.
5. Remove the old oil filter.
6. Apply a thin film of new oil to the gasket of the new filter and install it.
7. Reinstall the drain plug.
8. Fill the engine with the recommended type and quantity of new engine oil.
9. Start the engine and check for leaks.
10. Shut off the engine and recheck the oil level, adding if necessary.

5. Troubleshooting Guide

This section provides a guide to common issues that may arise with the Bobcat 631 Skid Steer Loader and offers potential solutions. This is not an exhaustive list, and complex issues should be addressed by a certified technician.

6. Specifications

This section provides key technical specifications for the Bobcat 631 Skid Steer Loader chassis. Refer to these specifications for proper component selection and operational parameters.

Note: For precise specifications, always consult the data plate on your specific Bobcat 631 machine and the relevant engine manufacturer's manual.

7. Warranty and Support

This service manual is a technical guide for repair and maintenance. For information regarding product warranty, please refer to the original purchase documentation or contact your authorized Bobcat dealer. Support for specific parts and service procedures can be obtained through official Bobcat service channels or authorized distributors.

For genuine Bobcat parts and certified service, always contact an authorized Bobcat dealer. Using non-genuine parts or unauthorized service may void your warranty and compromise machine performance and safety.

Publisher: Jensales