All 190 pages of this Case 400 Series Operator Manual are the factory reference for operating and maintaining your tractors. Inside: a full controls and instrument guide, wiring diagrams, hydraulic schematics for the Eagle Hitch and Constant Hydraulic Control systems, and a complete lubrication section mapping every grease point across engine, transmission, rear axle, and PTO. You also get a tiered maintenance schedule stepping through 60-, 120-, 240-, 500-, and 1000-hour intervals, plus a Service Suggestions chapter tackling the most common field problems: engine won't start, overheating, and low oil pressure. Set rear tire pressure to 14 pounds on 13-inch tires and 16 pounds on 14- through 18-inch sizes; the cooling system relief cap holds at 4 lbs. Your machine won't tell you what's wrong. This manual will. Bookmarked and searchable: jump straight to controls, lube charts, or the cold-weather
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cooling system cleaning frequency | once a year | p. 161 |
| Pressure cap control valve setting | 4 lbs | p. 160 |
| Rear Tire Pressure (13 Inch) | 14 pounds | p. 81 |
| Rear Tire Pressure (14, 15, 18 Inch) | 16 Pounds | p. 81 |
Case IH 400–403 series Common Problems This Manual Covers
Case IH 400 Series Tractor coolant temperature gauge rising rapidly and engine overheating p. 160
Inspect the cooling system for leaks and check the pressure cap. Verify the control valve functions as a safety relief valve and maintains exactly 4 lbs of pressure as specified on page 160. Replace the cap if it fails to hold this specification.
Manual Section: Engine OverheatingCoolant leakage from hoses or heavy dirt accumulation blocking the radiator fins p. 161
Drain the radiator and flush the block completely. Clean the entire cooling system at least once a year to prevent dirt buildup as instructed on page 161. Inspect all hoses, elbows, and the water manifold for degradation before refilling with fresh coolant.
Manual Section: Preventive MaintenancePoor traction in soft soil and uneven tread wear across the rear drive tires p. 81
Measure the air pressure in the rear wheels using an accurate gauge. Inflate 13-inch rear tires to a minimum pressure of 14 pounds, or use 16 Pounds for 14, 15, and 18-inch tires. Refer to page 81 for exact inflation procedures.
Manual Section: Operating InstructionsFrequently Asked Questions
What are the replacement specifications for Radiator cleaner and refill water for cooling system maintenance?
For cooling system maintenance, the manual specifies to clean the cooling system at least once a year. This involves draining the old coolant, adding a nationally known commercial brand radiator cleaner to the system, and then refilling with clean water after flushing the cleaning solutions. The process should be followed according to the cleaner's directions.
How do you fix Case 400 Series Tractor coolant temperature gauge rising rapidly and engine overheating?
Inspect the cooling system for leaks and check the pressure cap. Verify the control valve functions as a safety relief valve and maintains exactly 4 lbs of pressure as specified on page 160. Replace the cap if it fails to hold this specification.
How do you fix coolant leakage from hoses or heavy dirt accumulation blocking the radiator fins?
Drain the radiator and flush the block completely. Clean the entire cooling system at least once a year to prevent dirt buildup as instructed on page 161. Inspect all hoses, elbows, and the water manifold for degradation before refilling with fresh coolant.
How do you fix poor traction in soft soil and uneven tread wear across the rear drive tires?
Measure the air pressure in the rear wheels using an accurate gauge. Inflate 13-inch rear tires to a minimum pressure of 14 pounds, or use 16 Pounds for 14, 15, and 18-inch tires. Refer to page 81 for exact inflation procedures.
What format is this Case 400 manual in?
You get a 190-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Case 400 Operator Manual printable?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Does this Case 400 manual include wiring diagrams?
No. This is an operator and maintenance manual covering controls, lubrication, and scheduled service intervals. Electrical diagrams are not included; consult a separate service manual for those.
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