Part of the Case Repair Manuals.
Looking for the Case 721E service manual PDF straight from the factory? This 817-page Case 721E Wheel Loader Service Manual (OEM #87551874A) covers the whole machine: engine, power train, steering, brakes, hydraulics, and mounted equipment. You get full wiring diagrams for chasing electrical gremlins through your loader, hydraulic schematics with pressure check procedures, and troubleshooting charts for the transmission, brakes, and ride control system. Inside: stall tests, error codes, and step-by-step removal and installation for every major component, from the center pivot to the cab glass. Torque the engine mounting bolts to 244 to 298 Nm, then refill with 14.2 liters of oil after a filter change. No more chasing wiring faults with a multimeter and a prayer. Bookmarked and keyword-searchable; pull it up on your phone, walk out to the loader, and start wrenching.
What's Inside This Case 721E Manual
| System | Pages | Key Topics |
|---|---|---|
| General | - | Section Index - General |
| Engines | - | Section Index - Engines |
| Fuel System | - | Section Index - Fuel System |
| Electrical | - | Section Index - Electrical |
| Steering | - | Section Index - Steering |
| Power Train | - | Section Index - Power Train |
| Brakes | - | Section Index - Brakes |
| Hydraulics | - | Section Index - Hydraulics |
| Mounted Equipment | - | Section Index - Mounted Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Grade 5 Bolts, Nuts, and Studs (1/4 inch) | 108 to 132 Pound Inches (12 to 15 Newton metres) | p. 12 |
| Grade 5 Bolts, Nuts, and Studs (5/16 inch) | 204 to 252 Pound Inches (23 to 28 Newton metres) | p. 12 |
| engine mounting bolts | 244 to 298 Nm | p. 39 |
| drive shaft bolts | 53 to 62 Nm | p. 39 |
| Engine Oil Capacity with Filter Change | 14.2 liters | p. 18 |
| Engine Cooling System Capacity | 36.9 liters | p. 18 |
| Fuel Tank Capacity | 246 liters | p. 18 |
| Hydraulic Reservoir Refill Capacity | 105.7 liters | p. 18 |
| Engine Low Idle Speed | 875 to 925 rpm | p. 54 |
| Torque Converter Stall Speed | 1880 to 2025 rpm | p. 54 |
| Hydraulic System Stall Speed | 1885 to 2195 rpm | p. 54 |
| Air Conditioning System Refrigerant Capacity | 1.7 kg | p. 749 |
Case 721E Common Problems This Manual Covers
Case 721E steering wheel hard to turn, pump whines and steering response slow at idle
Check the hydraulic reservoir level before pulling any pump; refill capacity is 105.7 liters, listed with the other fluid capacities on page 18. Then test the loader and steering pump differential pressure, inspect the steering cylinders for internal leakage, and test the back pressure relief valve before condemning the main hydraulic pump.
Manual Section: Hydraulic Specifications, Troubleshooting, and Pressure Checks p. 18Auxiliary steering flow test fails, motor drawing high amperage during secondary steering check
Test auxiliary steering flow and motor current with the machine safely blocked. Page 328 sets the minimum at 24.6 L/min (6.5 U.S. gpm) at 104 bar with the ammeter reading 315 amperes; if flow falls short or the amperage runs past 315, remove the auxiliary steering motor and pump for bench testing. Inspect the motor wiring and ground connections first; a corroded ground will mimic a worn pump on the amp clamp.
Manual Section: Hydraulic Specifications, Troubleshooting, and Pressure Checks p. 328Hydraulic oil temperature warning with codes 1312 or 1313, oil smells burnt after an hour of loading
Confirm the code against the error code reference, then verify oil level and condition before anything else. Clean packed debris out of the cooler fins with compressed air, check fan operation, and run a hydraulic stall test; compare readings against the 1885 to 2195 rpm hydraulic stall specification before blaming the pump.
Manual Section: Hydraulic Specifications, Troubleshooting, and Pressure Checks p. 287Engine runs fine unloaded but machine feels weak, bucket slow and sluggish pushing into the pile
Run the stall tests before tearing anything down. Warm the machine fully, verify low idle sits at 875 to 925 rpm, then perform a torque converter stall and check it against the 1880 to 2025 rpm specification on page 54. Readings below spec point to the engine; readings above spec point to converter slippage.
Manual Section: Stall Tests p. 54Injector fault codes 3077, 3078, or 3079 keep returning, engine misses on the No. 2 cylinder
Check the cylinder 2 injector harness before replacing the injector. Trace the circuit on the wiring diagram, then wiggle-test connectors with the engine at low idle, 875 to 925 rpm, and listen for the miss to change. Code 3077 is a short to battery positive; 3079 is shorted to ground.
Manual Section: Electrical Specifications and TroubleshootingFrequently Asked Questions
What are the torque specifications for Grade 5 bolts, nuts, and studs for a 1/4 inch size?
For Grade 5 bolts, nuts, and studs with a 1/4 inch size, the torque specification is 108 to 132 pound-inches, which is equivalent to 12 to 15 Newton-metres. p. 12
What is the engine oil capacity for the 721E wheel loader?
The engine oil capacity for the 721E wheel loader, including the filter change, is 14.2 liters (15 U.S. quarts). p. 18
How often should the engine oil and filters be changed on the 721E?
The engine oil and filters should be changed every 500 hours of operation, with an initial change required at the first 100 hours. p. 21
What is the correct procedure to reset trip information on the instrument cluster?
To reset trip information, highlight the trip screen you wish to set, then press the confirm button on the keypad to reset the selection to zero. p. 6
What is the torque specification for the engine mounting bolts on the 721E?
The engine mounting bolts must be tightened to a torque of 244 to 298 Nm (180 to 220 lb-ft). p. 39
How is this Case 721E Service Manual delivered?
Delivery is instant: a 817-page searchable PDF is yours the second checkout clears. Laptop, tablet, or phone, all fine.
Does this Case 721E manual allow printing?
Printing is allowed without restriction. Pull the pages you need for the job and bin them when they get greasy.
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