Introduction
This service manual provides comprehensive information for the proper maintenance, repair, and overhaul of the Case-IH 1660 Combine. It is designed for qualified service technicians and individuals with a thorough understanding of mechanical systems. Adherence to the procedures outlined in this manual is crucial for ensuring the safe and efficient operation of the machinery.
Product Overview

Figure 1: Cover of the Case-IH 1660 Combine Service Manual. The cover features a detailed line drawing of a tractor, indicating the technical nature of the manual. The manual itself is spiral-bound, suggesting ease of use for technicians in a workshop environment.
The Case-IH 1660 Combine is an agricultural machine designed for harvesting various crops. This manual covers all major systems and components, providing the necessary information to diagnose and resolve operational issues, perform routine maintenance, and execute detailed repairs.
Safety Information
Always prioritize safety when working on the Case-IH 1660 Combine. Failure to follow safety precautions can result in serious injury or death. Read and understand all safety warnings and instructions before performing any service or maintenance.
- Disconnect power and hydraulic pressure before servicing.
- Wear appropriate personal protective equipment (PPE), including safety glasses, gloves, and sturdy footwear.
- Ensure the machine is stable and properly supported before working underneath it.
- Use only approved tools and replacement parts.
- Keep the work area clean and well-lit.
Preparation for Service
Before beginning any service procedure, ensure the following steps are completed:
- Park the combine on a level, stable surface.
- Engage the parking brake.
- Turn off the engine and remove the ignition key.
- Allow hot components to cool down.
- Clean the area around the component to be serviced to prevent contamination.
Maintenance Procedures
Regular maintenance is essential for the longevity and optimal performance of your Case-IH 1660 Combine. Refer to the specific sections within the manual for detailed instructions on each task.
Engine Maintenance
- Oil Change: Replace engine oil and filter at recommended intervals.
- Air Filter: Inspect and clean/replace air filter elements.
- Fuel System: Check fuel filters and water separators.
Hydraulic System
- Fluid Level: Check hydraulic fluid level and add as necessary.
- Filter Replacement: Replace hydraulic filters according to the maintenance schedule.
- Hose Inspection: Inspect hydraulic hoses for wear, cracks, or leaks.
Electrical System
- Battery: Check battery terminals for corrosion and ensure proper charge.
- Wiring: Inspect wiring harnesses for damage or loose connections.
Troubleshooting
This section provides guidance for diagnosing common issues. For complex problems, consult a qualified technician or refer to the detailed troubleshooting charts within the full manual.
| Symptom | Possible Cause | Action |
|---|---|---|
| Engine fails to start | Low fuel, dead battery, faulty starter | Check fuel level, charge/replace battery, inspect starter motor. |
| Hydraulic system sluggish | Low fluid level, clogged filter, worn pump | Check fluid, replace filter, inspect pump. |
| Excessive vibration | Unbalanced components, loose fasteners, worn bearings | Inspect for loose parts, check balance, replace worn bearings. |
Specifications
Key technical specifications for the Case-IH 1660 Combine are detailed in the full service manual. This includes engine type, power output, fuel capacity, hydraulic system capacity, and dimensions. Always refer to the official manual for precise figures relevant to your specific model year.
- Engine: Consult manual for specific model and horsepower.
- Fuel Capacity: Refer to manual.
- Hydraulic System Capacity: Refer to manual.
- Weight: Refer to manual.
Support and Further Information
For additional support, specific part numbers, or complex repair procedures not covered in this summary, please refer to the complete Case-IH 1660 Combine Service Manual. Contact your authorized Case-IH dealer for genuine parts and professional service.
Manufacturer: Case-IH
Publication Date: September 11, 1986
