1. Introduction
This service manual provides comprehensive instructions for the maintenance, repair, and overhaul of the Case-IH 1688 Axial Flow Combine. It is designed for qualified service technicians and individuals with a thorough understanding of agricultural machinery mechanics. Adherence to the procedures outlined in this manual is crucial for ensuring the safe and efficient operation of the combine.
Always prioritize safety. Before performing any service or repair, ensure the combine is safely shut down, all moving parts have stopped, and appropriate lockout/tagout procedures are followed. Refer to the safety section within the manual for detailed precautions.
Figure 1: Cover of the Case-IH 1688 Axial Flow Combine Service Manual. This image displays the front cover of the manual, featuring the Case-IH logo and the model number 1688 Axial Flow Combine.
2. Preparation for Service
Before commencing any service or repair work on the Case-IH 1688 Axial Flow Combine, proper preparation is essential to ensure safety and efficiency. This section outlines general preparatory steps.
- Safety First: Always disconnect the battery and engage all safety locks and blocks. Ensure the engine is off and cooled down. Relieve hydraulic pressure where applicable.
- Cleanliness: Clean the work area and the combine itself, especially around the components to be serviced, to prevent contamination.
- Tools and Equipment: Gather all necessary tools, specialized equipment, and replacement parts as specified in the relevant section of this manual for the task at hand.
- Personal Protective Equipment (PPE): Wear appropriate PPE, including safety glasses, gloves, and hearing protection, as required by the specific task.
- Documentation: Have this service manual open to the correct section and any supplementary diagrams or schematics readily available.
3. Using This Service Manual
This manual is organized into sections covering various systems and components of the Case-IH 1688 Axial Flow Combine. To effectively use this manual:
- Section Navigation: Each major system (e.g., Engine, Transmission, Hydraulics) has its own dedicated section. Refer to the manual's internal index or table of contents for specific page numbers.
- Diagrams and Illustrations: Pay close attention to all diagrams, exploded views, and illustrations. These are critical for identifying components and understanding assembly/disassembly sequences.
- Specifications and Torque Values: Always consult the specifications tables for correct clearances, adjustments, and torque values. Using incorrect values can lead to component failure.
- Special Tools: Some procedures require specialized tools. These are typically listed at the beginning of the relevant section. Ensure these tools are available before starting work.
- Safety Warnings: Read and understand all safety warnings and cautions presented throughout the manual.
4. Maintenance Procedures
Regular maintenance is vital for the longevity and optimal performance of the Case-IH 1688 Axial Flow Combine. This manual details various maintenance schedules and procedures, including but not limited to:
- Engine Maintenance: Oil changes, filter replacements (oil, fuel, air), valve adjustments, cooling system checks.
- Hydraulic System: Fluid level checks, filter replacement, hose inspection, pressure adjustments.
- Electrical System: Battery testing, wiring inspection, fuse replacement, alternator and starter motor service.
- Drive Train: Belt and chain tension adjustments, lubrication, bearing inspection and replacement.
- Harvesting Components: Inspection and adjustment of concaves, rotors, sieves, and cleaning fan.
- Lubrication: Detailed lubrication charts indicating points, types of lubricant, and frequency.
Refer to the specific maintenance schedule section within the manual for recommended service intervals based on operating hours or calendar time.
5. Troubleshooting Guide
This section provides a systematic approach to diagnosing common issues that may arise with the Case-IH 1688 Axial Flow Combine. It is structured to help identify the root cause of a problem and guide you to the appropriate repair section.
| Symptom | Possible Cause | Action/Reference Section |
|---|---|---|
| Engine Fails to Start | Low battery, fuel system issue, starter motor fault | Check battery voltage, inspect fuel lines/filters, refer to Electrical System section. |
| Hydraulic System Malfunction | Low fluid level, clogged filter, faulty pump/valve | Check fluid, replace filter, refer to Hydraulic System section. |
| Poor Threshing Performance | Incorrect concave clearance, worn rotor bars, improper fan speed | Adjust settings, inspect components, refer to Harvesting Components section. |
For detailed diagnostic charts and specific repair procedures, consult the relevant chapters within this service manual.
6. Technical Specifications
This service manual contains detailed technical specifications for the Case-IH 1688 Axial Flow Combine. These specifications are crucial for proper adjustment, repair, and component replacement.
- Engine Specifications: Horsepower, displacement, bore/stroke, compression ratio, fuel system details.
- Fluid Capacities: Engine oil, hydraulic fluid, coolant, fuel tank capacity.
- Torque Specifications: Specific torque values for fasteners across various systems.
- Clearances and Adjustments: Recommended settings for valve lash, belt tension, concave clearance, etc.
- Electrical System Data: Alternator output, battery specifications, wiring diagrams.
Always refer to the specific tables and charts within the manual for precise values, as these can vary based on serial number ranges or specific configurations.
7. Warranty Information
This document is a service manual for the Case-IH 1688 Axial Flow Combine. It provides repair and maintenance instructions. Warranty information for the combine itself is typically provided with the original purchase documentation from Case-IH or an authorized dealer.
For details regarding the warranty coverage, terms, and conditions for your Case-IH 1688 Axial Flow Combine, please consult the original owner's manual or contact an authorized Case-IH dealership.
8. Customer Support
For further assistance, technical inquiries, or to order genuine Case-IH replacement parts, please contact your authorized Case-IH dealer. They have access to the latest service bulletins, specialized tools, and factory-trained technicians.
You can also visit the official Case-IH website for dealer locators and additional product information. When contacting support, always have your combine's model and serial number readily available.