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Part of the Case Repair Manuals.
This 846-page Case 521E Service Manual (OEM 87728450 A - EU) covers the 521E, 521E Tier III, and 521E Wheel Loader Tier III down to the last cotter pin. Open it and you get full electrical schematic foldouts, hydraulic circuit diagrams with component numbers, and a dedicated troubleshooting section for loss of power or slow loader operation. Transmission, front axle, rear axle, steering, and brake pump procedures sit right alongside the air conditioning system checks nobody else bothers to document well. Set the auxiliary A and B port relief valve to 290 bar, and top off the engine with 11.8 liters of Case AKCELA 15W-40 after a filter change. No more flipping through three forum threads to find one pressure spec. It's bookmarked by section, so you jump straight from Power Train to Hydraulics without scrolling, then bring your tablet out to the 521E and get the bucket back to spec.
What's Inside This Case 521E, 521E TIER III Manual
| System | Pages | Key Topics |
|---|---|---|
| General | General Service Information, Specifications, Standard Torques, And Maintenance for the 521E Wheel Loader | |
| Power Train | Transmission, Torque Converter, Axles, Differentials, And Final Drives | |
| Loader & Mounted Equipment | Loader Frame, Arms, Bucket and Linkage, Mounting, And the Mounted-Equipment Index | |
| Air Conditioning & Heating | Air Conditioning Troubleshooting and System Checks, A/C and Heater Component Removal and Installation, And Refrigerant Service | |
| ROPS & Cab | Roll Over Protective Structure (ROPS), Cab Structural Frame (Csf), And Cab Glass Installation | |
| Electrical & Hydraulic Schematics | Electrical and Hydraulic Schematic Foldouts and Wiring References |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine Oil Capacity with Filter Change | 11.8 liters (12.5 U.S. Quarts) | p. 18 |
| Engine Oil Type | Case AKCELA (SAE 15W-40) | p. 18 |
| Circuit relief valve pressure setting Auxiliary A and B port (XT and Z Bar) | 290 bar (4206 psi) | p. 680 |
| Circuit relief valve pressure setting Bucket A and B port (Z Bar) | 290 bar (4206 psi) | p. 680 |
| Engine Oil Capacity (with Filter Change) | 11.8 liters (12.5 U.S. Quarts) | p. 18 |
| Fuel Tank Capacity | 189.3 liters (50 U.S. Gallons) | p. 18 |
| Hydraulic System Total Capacity | 113.6 liters (30.0 U.S. Gallons) | p. 18 |
| Transmission Total System Capacity | 26 liters (27.5 U.S. Quarts) | p. 18 |
| Axles Capacity (Front/Rear) | 22.0 liters (23.2 U.S. Quarts) | p. 18 |
| Torque for piston cap screw (Steering Cylinder) | 585 to 720 Nm (431 to 531 pound-feet) | p. 328 |
| Torque for gland (Steering Cylinder) | 339 to 475 Nm (250 to 350 pound-feet) | p. 328 |
| Torque converter stall speed | 1950 to 2030 rpm | p. 58 |
Case 521E, 521E TIER III Common Problems This Manual Covers
Case 521E engine cranks but won't start or runs rough after sitting, fuel looks cloudy
Drain a sample from the fuel tank sump first; water settles at the bottom and is the most common cause of erratic running on this machine. Replace the fuel filter (500 hour interval) and the fuel pre-filter (1000 hour interval), then bleed the lines before restarting. Check the maintenance schedule for the correct service intervals.
Manual Section: Engine Stall TestsLoader arms move sluggish or bucket won't curl under load, hydraulic response feels weak
Connect a pressure gauge to the auxiliary circuit test port and run the engine at hydraulic system stall speed (1900 to 2100 rpm) per page 58. Compare your reading against the circuit relief valve setting of 290 bar (4206 psi) for the auxiliary A and B ports. If pressure reads low, inspect the loader control valve for internal leakage and check the hydraulic oil filter, replaced every 1000 hours, for clogging before condemning the pump.
Manual Section: Hydraulic System TroubleshootingSteering feels heavy or wanders at low speed with no dash warning lights
Verify hydraulic fluid level against the total system capacity of 113.6 liters (30.0 U.S. Gallons) listed on page 18, since a low reservoir starves the steering circuit before other symptoms show. Inspect the steering cylinder gland and piston cap screw for seepage; torque the piston cap screw to 585 to 720 Nm (431 to 531 pound-feet) if it was recently serviced. Bleed air from the circuit and retest steering effort at idle.
Manual Section: Steering System TroubleshootingTransmission shifts hard or slips between gears under load
Check transmission fluid level and condition first; total system capacity is 26 liters (27.5 U.S. Quarts) per page 18, and dark or burnt-smelling fluid points to internal wear rather than a simple top-off. Run the stall test at 1950 to 2030 rpm (torque converter stall speed, page 58) and record the reading. If stall speed is low, suspect converter or clutch pack wear; if high, check for slipping clutches before pulling the transmission.
Manual Section: Transmission System TroubleshootingBattery drains overnight or alternator light stays on during operation
Load-test the battery against its rated cold cranking capacity of 700 amperes at -17 degrees C (0 degrees F) for 60 seconds; a battery reading well below spec needs replacement, not just charging. Verify alternator output at 24 volt, 65 amperes with the engine at operating RPM, and inspect belt tension and ground straps for corrosion before replacing the alternator.
Manual Section: Electrical System TroubleshootingCab air conditioning blows warm or cools only intermittently in hot weather
Connect manifold gauges to the high and low side service ports and check charge against the rated refrigerant capacity of 1670 to 1730 g (3.68 to 3.82 lbs) listed on page 778. Low charge with no visible leak points to a slow seep at the condenser or receiver drier fittings; recover, evacuate, and recharge per the procedure on page 776 rather than just topping off refrigerant.
Manual Section: Air Conditioning System Troubleshooting p. 750Frequently Asked Questions
What does this Case 521E service manual volume cover?
This volume documents the 521E Tier 3 wheel loader's power train, the loader and mounted equipment, the air conditioning and heating system, the ROPS and cab, and the electrical and hydraulic schematic foldouts, with specifications, torque data, troubleshooting, and step-by-step service procedures for each.
My 521E air conditioning is not cooling. Where do I start?
Use the Air Conditioning & Heating section. Follow its troubleshooting and system checks first, verify refrigerant charge and component operation, then use the removal and installation procedures for the A/C and heater components. Most no-cool complaints trace to charge or a failed component, isolated by the section's checks before replacing parts.
Where are the wiring and hydraulic diagrams for the 521E?
The Electrical & Hydraulic Schematics section provides the schematic foldouts. Use them alongside the Power Train and system sections to trace circuits and hydraulic routing when diagnosing the loader.
Does this cover the power train and loader service?
Yes. The Power Train section covers the transmission, torque converter, axles, differentials, and final drives, and the Loader & Mounted Equipment section covers the loader frame, arms, bucket, and linkage, each with specifications and step-by-step service procedures.
What do I get after purchasing this Case 521E, 521E TIER III, 521E Loader?
Instant PDF download (38 MB). You get the full 846-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this Case 521E, 521E TIER III, 521E Loader?
Zero restrictions. 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 521E, 521E TIER III, 521E Loader, 521E Wheel Loader manual?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
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