Part of the Case Repair Manuals.
Every one of the 489 pages in this Case Compact Wheel Loader service manual (OEM #87734636C) covers the 21E, 121E, 221E, and 321E, so you're not hunting through a generic guide for your specific machine. Open it up and you get full hydraulic schematics for the variable-displacement piston pump and travel motor, complete wiring diagrams for fuses, relays, and bulb circuits, and a troubleshooting section that walks each axle, brake, and steering fault back to its cause. Set the main control valve relief at 230 ± 10 bar, and torque the fuel pump and fuel filter to 25 Nm each; this book even tells you loader arms drooping about 15 mm over 15 minutes is normal cylinder yield, not a leak to chase. That quick coupler jamming on you mid-job? Page 467 has the exact reset procedure. Download it, open it on your phone at the machine, and search any spec by keyword instead of flipping pages.
What's Inside This Case 21E, 121E, 221E, 321E Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 8-35 | Safety Instructions, Technical Specifications |
| Engine | 36-43 | Diesel Engine, Fuel System, Cold Start Device |
| Front Axles | 44-127 | Removal and Installation, Dimensions, Technical Specifications, Oil Change, Disassembly and Assembly, Troubleshooting, Special Tools |
| Rear Axles | 128-239 | Motor TB150, Motor TB138.5 "High Speed", Transmission Box TB150, Transmission TB138.5 "High Speed", Reduction Gear (21E), Reduction Unit (121E, 221E |
| Brake System | 240-259 | Brake System Diagram, Technical Specifications, Operation, Brake Pedal Valve, Brake Accumulator, Troubleshooting |
| Hydraulic System | 260-351 | Hydraulic Diagrams, Transmission, Variable-Displacement Piston Pump, Gear Pump, Travel Motor, Troubleshooting |
| Frame | 352-357 | Articulated Joint, Components, Disassembly and Assembly |
| Steering System | 358-393 | Operation, Power Steering, Steering Cylinder, Troubleshooting, Special Tools |
| Heating and Airconditioning System | 394-427 | Heating, Air Conditioning, Troubleshooting, Operation, System Overhaul |
| Electrical System | 428-459 | Electrical Diagrams, Fuses and Relays, Voltage and Continuity Check, Battery, Bulbs, Troubleshooting |
| Working Equipment | 460-489 | Hydraulic Diagram, Quick Tool Coupler, Bucket, Forks, Cylinders, Control Valve |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel pump tightening torque | 25 Nm (18.43 lbf·ft) | p. 25 |
| Fuel filter tightening torque | 25 Nm (18.43 lbf·ft) | p. 25 |
| High pressure relief valve (main control valve) setting | 230 ± 10 bar (3335 ± 145) | p. 486 |
| Lifting cylinders yield (droop) over 15 minutes | about 15 mm (0.59 in) | p. 487 |
| Engine weight | 300 kg (660 lb) | p. 24 |
| Total displacement | 3202 cm3 (195.36 in3) | p. 24 |
| External noise level LWA | 98 dB (A) | p. 24 |
| Internal noise level LpA | 75 dB (A) | p. 24 |
| Brake pedal valve - Allowable service pressure | 175 bar (2538 psi) | p. 26 |
| Steering system pressure | 175 bar (2537 psi) | p. 27 |
| Wheel nuts tightening torque | 550 Nm (405.65 lbf·ft) | p. 33 |
Case 21E, 121E, 221E, 321E Common Problems This Manual Covers
Case 21E engine cranks slowly or fails to start completely after short periods of operation p. 458
Inspect the fuel system for blockages and replace the fuel filter if contaminated. Tighten the new filter housing and fuel pump bolts to exactly 25 Nm (18.43 lbf·ft) as specified on page 25. Drain the tank to clear out any remaining debris.
Manual Section: EngineLoader arms lose hydraulic pressure and droop slowly during heavy load operation or bucket lifting p. 487
Measure the lifting cylinders yield over 15 minutes. If the droop exceeds about 15 mm (0.59 in) as noted on page 487, inspect the cylinder seals and main control valve. Verify the high pressure relief valve is set to 230 ± 10 bar (3335 ± 145) per page 486.
Manual Section: Working Equipment TroubleshootingBrake pedal feels stiff and braking action is severely delayed or insufficient during normal travel p. 26
Check the brake pedal valve and ensure the allowable service pressure reaches 175 bar (2538 psi) as indicated on page 26. Verify the brake accumulator holds its full 0.32 litres (0.10 gal) capacity per page 29. Bleed the brake lines to remove any trapped air.
Manual Section: Brake System TroubleshootingSteering wheel feels extremely hard to turn or becomes suddenly wobbly while traveling under load p. 27
Test the steering system pressure at the main test port. Verify the pressure reaches exactly 175 bar (2537 psi) as shown on page 27. If pressure is low, inspect the power steering pump for internal wear and check the steering cylinder seals for bypass leaks.
Manual Section: Steering System TroubleshootingFrequently Asked Questions
How to troubleshoot a hydraulic quick coupler that is jammed on Case E Series wheel loaders?
If the quick coupler hooks get jammed, hindering the opening of the locking system, the accumulator needs to be manually charged. This can be done by quickly retracting the working equipment to stroke end (for instance, by fully tipping back the bucket), which activates the main relief valve inside the control valve. Once the accumulator is completely charged, the coupler should open without any problem.
What is the tightening torque for the fuel pump on Case E Series compact wheel loaders?
The tightening torque for the fuel pump is 25 Nm (18.43 lbf·ft). This specification is found in the tightening torques table for engine components.
What are the general replacement instructions for hydraulic cylinder seals?
When disassembling hydraulic systems, it is generally recommended to replace all O-rings and seal rings. These components should be checked for wear, and only original spare parts should be used for replacement.
What is the tightening torque for the oil pan plug?
The oil pan plug should be tightened to a torque of 50 Nm (36.87 lbf·ft). This specification is listed under the tightening torques for engine components.
Is this Case 21E, 121E, 221E, 321E Service Manual a digital download?
Immediate download of the complete 489-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Are there any print restrictions on this Case 21E, 121E, 221E, 321E manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Are there wiring harness diagrams in this Case 21E, 121E, 221E, 321E manual?
Yes, this Case 21E, 121E, 221E, 321E Service Manual includes complete electrical wiring diagrams, wire routing, and connector pinouts.
Reviews
There are no reviews yet.