Built around OEM document 5100050373, this Wacker Neuson SW28 service manual PDF tears into four large frame machines, the SW skid steers and ST compact track loaders, across 558 pages of factory service data. Sub circuit schematics trace the drive, boom and bucket control circuits wire by wire, while the electrical section identifies every component on both the 55 kW and 75 kW engine packages. Hydrostatic power train and hydraulics each carry their own theory of operation, diagnostic tables and repair procedures, and a WANDA section shows you how to test and configure the controller itself. Fill the hydraulic system with 42.3 qt (40 L); the SW28 and both ST models take 16.5 qt (15.6 L) of engine oil. A relay test stalls fast when one pinout stays missing. Bookmarks and a live text layer put whichever of the six main sections you need one click away.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| Specifications and General Information | 21-34 | Commonly Used Terms, Standard Torque Values, Track and Tire Maintenance, Service Information |
| Specifications and Component Symbols | 35-45 | Test and Adjustment Specifications, Dielectric Sealant Locations, Electrical Component Symbols |
| Electrical Schematic Component Identification | 46-117 | 55 kW Engine Components, 75 kW Engine Components, Cab Pdm, Chassis Pdm, Auxiliary Electric Pdm |
| Theory of Operation and Sub Circuit Schematics | 118-259 | Machine Power Circuit, Start Circuit, Run Circuit, Charging Circuit, Drive Circuit, Boom Controls Circuit, Bucket Controls Circuit |
| Component Testing | 260-289 | Relay Test, Key Switch Test, Horn Switch Test, Seat Switch Test, HVAC Switch Test, Pressure Transducer Test |
| Repair and Adjustments | 290-342 | Backup Audible Alarm Adjustment, Battery, Alternator, Starter, Instrument Display, Joystick, Sensors |
| Hydrostatic Power Train | 343-416 | Hydrostatic Pump and Motor Theory, Charge Pressure Diagnostics, Drive Loop Troubleshooting, Track Drive Faults |
| Hydraulics | 417-504 | Work Hydraulics Theory, Loader and Auxiliary Circuits, Relief Pressure Tests, Cylinder Diagnostics |
| Wanda Diagnostics and Configuration | 505-538 | Diagnostics, Configuration |
| Aftertreatment | 539-558 | Diesel Exhaust Fluid and Aftertreatment Fuel Lines, Diesel Exhaust Fluid Tank |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| SW23, SW27, SW24 |
| Engine Oil | 10.3 qt (9.8 L) | p. 30 |
| Engine Oil Capacity (SW23, SW27, SW24) | 10.3 qt (9.8 L) | p. 30 |
| SW28, ST35, ST45, ST40, ST50 |
| Engine Oil Capacity (SW28, ST35, ST45, ST40, ST50) | 16.5 qt (15.6 L) | p. 30 |
| All Models |
| Hydraulic Oil Capacity | 42.3 qt (40 L) | p. 30 |
| Drive motor bolt torque | 214 lb-ft (290 N•m) | p. 345 |
| Charge Pressure | 406 psi (28 bar) | p. 345 |
| Hydrostatic Pressure Relief Setting (Mechanical) | 5221 psi (360 bar) | p. 345 |
| Hydrostatic Pressure Relief Setting (EH) | 5511 psi (380 bar) | p. 345 |
| Main Relief Valve Adjustment | 3480 psi (240 bar) | p. 419 |
| Gear Pump Operating Pressure | 3626 psi (250 bar) | p. 419 |
| ST35, ST45 |
| Engine Coolant Capacity (ST35, ST45) | 17.5 qt (16.5 L) | p. 30 |
| ST40, ST50 |
| Engine Coolant Capacity (ST40, ST50) | 21.8 qt (20.6 L) | p. 30 |
