Splitting one of International Harvester's five articulated four-wheel-drive tractors is a weekend job with the right book, and the 339 pages of factory manual GSS-1445-1 exist to walk you through it. The International Harvester 4366, 4386, 4568, 4586, 4786 service manual PDF routes you through wiring diagrams covering the Digital Data Center and monitor circuits, hydraulic schematics for both the 4366/4386 basic system and the hitch-equipped 4568/4586/4786 layout, and clutch, transfer case and differential teardowns that finish with reassembly clearances and bearing end play settings. Testing sections put a gauge on power steering and auxiliary valve unlatching pressure. Check the 4366 alternator for 25 amps cold output at 2000 rpm, then torque the pump capscrews to 16 N·m (12 ft. lbs.). Bookmarked and text-searchable, so you order the right part number the first time.
What's Inside This International Harvester 4366–4786 Manual
| System | Pages | Key Topics |
|---|---|---|
| Cab, Air Conditioning and Splitting the Tractor | 21-36 | Cab Removal, Air Conditioning Components, Splitting the Tractor |
| Steering | 37-42 | Hand Pump Removal, Hand Pump Disassembly, Hydraulic Cylinders |
| Engine 4366 and 4386 | 43-46 | Specifications, Removal, Valve Clearance, Injection Pump, Injection Nozzles |
| Engine 4568, 4586 and 4786 | 47-50 | Specifications, Engine Removal, Oil Pan Removal, Valve Clearance, Injection Pump, Injection Nozzles |
| Fuel System | 51-54 | Specifications, Fuel Tank Removal, Fuel Tank Installation, Welding Repairs, Diesel Fuel Tanks |
| Electrical System | 55-80 | Digital Monitor, Digital Data Center, Wiring Diagrams |
| Cooling System | 81-82 | Specifications, Radiator Removal, Radiator Installation, Coolant Capacity |
| Clutch and Flywheel | 83-122 | Clutch Assembly Removal, Clutch Disassembly, Clutch Reassembly |
| Transmission 4366 and 4386 | 123-164 | Shift Bar Housing Assembly, Auxiliary Section, Mainshaft Assembly |
| Transmission 4568, 4586 and 4786 | 165-204 | Transmission Shift Cover, Mainshaft Assembly Removal, Countershaft Assembly |
| Frames, Differentials, Axles and Housings | 205-244 | Differential Assembly, Axle and Bull Pinion Shaft, Front Frame Removal |
| Transfer Case 4366 and 4386 | 245-254 | Transfer Case Removal, Transfer Case Disassembly, Bearing End Play Adjustment |
| Transfer Case 4568, 4586 and 4786 | 255-262 | Transfer Case Removal, Bearing End Play Adjustment |
| Brakes 4366 and 4386 | 263-278 | Hydraulic Caliper Brake, Brake Bleeding Procedure, Power Hydraulic Multi-Disc Brakes |
| Brakes 4568, 4586 and 4786 | 279-292 | Power Brake Valve, 4786 Brake Removal, Brake Inspection and Repair |
| Hydraulic System 4366 and 4386 | 293-308 | Basic Hydraulic System, Transmission Pump, Hydraulic Pumps |
| Hydraulic System 4568, 4586 and 4786 | 309-324 | Basic Hydraulic System, Hitch Components, Hydraulic Pump |
| Testing the Hydraulic System | 325-339 | Trouble Shooting Basic System, Trouble Shooting Power Steering, Auxiliary Valve Unlatching Pressure |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Valve tie bolt torque | 20-25 ft. lbs. | p. 335 |
| Air conditioning SAE 45° flare connection torque (3/8 tube) | 15/19 to 20/24 Ft./Lbs. | p. 27 |
| Air conditioning SAE 45° flare connection torque (1/2 tube) | 21/27 to 35/40 Ft./Lbs. | p. 27 |
| Pump capscrews torque | 16 N·m (12 ft. lbs.) | p. 7 |
| 4366 | ||
| 4366 Alternator cold output | 25 Amps at 2000 RPM | p. 56 |
| Transmission Lube Pump Capacity (4366 Only) | 3.0 to 3.5 GPM | p. 294 |
| 4386 | ||
| 4386 Alternator cold output | 25 Amps at 2500 RPM | p. 56 |
| 4366 and 4386 | ||
| Transmission Output Shaft Nut Torque | 450-500 ft. lbs. | p. 125 |
| Transfer Case Capacity | 1 gal. | p. 245 |
| Auxiliary Valve Unlatching Pressure | 1450-1800 psi | p. 294 |
International Harvester 4366–4786 Common Problems This Manual Covers
Front driveline growls and power divider runs hot on the articulated four wheel drive
Drain and refill the transfer case and confirm it takes the full 1 gal. capacity shown on page 245 for 4366 and 4386 units. Then check bearing end play using the adjustment procedure in the transfer case section before you run another field.
Manual Section: Transfer Case 4366 and 4386 p. 245Battery goes dead overnight and dash monitor flickers when the loader valve is worked
Load test the alternator at rated speed. A 4366 unit should put out 25 Amps at 2000 RPM cold per the chart on page 56. Clean and retighten every ground strap on the cab and frame, then trace the circuit on the wiring diagram on page 77 before condemning the digital monitor.
Manual Section: Electrical System p. 55Clutch chatters on takeoff and drags when shifting range with the PTO engaged
Split the tractor and follow the clutch reassembly and adjusting ring procedure on page 102, coating the adjusting ring threads with IH 251 HEP grease before presetting it.
Manual Section: Clutch and Flywheel p. 83Transmission whines under load and output shaft seal weeps oil at the rear housing
Check lube pump flow before tearing anything down. A 4366 transmission lube pump should move 3.0 to 3.5 GPM as specified on page 294. If flow is short, pull the pump and screen. When you button the mainshaft back up, torque the output shaft nut to 450-500 ft. lbs. per page 125.
Manual Section: Transmission 4366 and 4386 p. 123Frequently Asked Questions
What are the torque specifications for the transmission output shaft nut on the 4366 and 4386 tractors?
The torque specification for the transmission output shaft nut on the 4366 and 4386 tractors is 450 to 500 foot pounds. p. 125
What is the correct procedure for bleeding the brakes on a 4386 tractor with serial number 1500 and below?
To bleed the brakes, ensure the master cylinder is full of brake fluid, attach a hose from the bleeder valve to a container of fluid, and push the brake pedal slowly until a solid stream of fluid flows. Tighten the fitting, repeat for the other brake assembly, and recheck the pedal. p. 269
How do you fix international Harvester 4366 power steering wanders and hand pump leaks down with front wheels drifting under load?
Pull the hand pump and inspect the gerotor and control parts before you buy a new pump. On reassembly, turn the input shaft to check for binding, then torque the capscrews evenly to 16 N·m (12 ft. lbs.) per page 41, then hook up gauges and run the power steering tests starting on page 325 with the engine at operating temperature. p. 37
How do you fix remote hydraulic valve will not hold a cylinder, detent kicks out early on the three-point hitch?
Test auxiliary valve unlatching pressure first. On 4366 and 4386 machines it should fall between 1450 and 1800 psi as listed on page 294. Adjust or rebuild the latching mechanism if it trips low, then torque the valve tie bolts to 20-25 ft. lbs. on reassembly so the sections seal square. p. 325
Will this International Harvester 4366 Service Manual download right away?
A 339-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Is this International Harvester 4366 Service Manual printable?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Does this International Harvester 4366 manual have electrical schematics?
Yes, this International Harvester 4366 & variants Service Manual includes electrical wiring diagrams. See page 62 for an example.
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