Factory publication 5100029245 is the real Wacker Neuson ST28 service manual PDF: 506 pages from the OEM covering the full medium frame skid steer and compact track loader family, six models from the SW16 to the ST31. Wiring schematics map the chassis and auxiliary power distribution modules, the CAN networks, and the key switch circuit, and theory of operation chapters walk the drive, boom, bucket, ride control and self level circuits one relay at a time. Hydrostatic power train troubleshooting takes up a large share of the book, backed by hydraulic schematics and a closing section on WANDA diagnostics and configuration. When your filters come due, fit a 4 micron hydraulic element, and refill an ST28 or ST31 crankcase with 9.8 liters of oil, not the 7.5 the smaller frames take. A loader parked on a dead interlock earns you nothing. Bookmarked and text searchable, the PDF is yours to download today.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications and General Information | 21-30 | Commonly Used Terms, Standard Torque Values, Track and Tire Maintenance, Service Information (Fluids, Maintenance Kits, Service Schedule) |
| Electrical Specifications and Component Identification | 31-43 | Specifications, Test and Adjustment Specifications, Dielectric Sealant, Electrical Schematic Component Identification, Cab Power Distribution Module |
| Electrical Schematics and Power Distribution | 44-73 | Chassis Pdm, Auxiliary Electric Pdm, CAN Networks, Key Switch, Power Distribution, Lighting, Telemetry |
| Theory of Operation: Power and Start Circuits | 74-110 | Machine Power Circuit, Unswitched Power, Switched Power, Interlock Circuit, Start Circuit, Run Circuit, Charging Circuit |
| Theory of Operation: Drive and Boom Controls | 111-162 | Drive Circuit Forward, Drive Circuit Reverse, Drive Circuit Right Turn, Drive Circuit Left Turn, Boom Controls Circuit |
| Theory of Operation: Bucket, Ride, and Auxiliary Hydraulics | 163-201 | Bucket Controls Circuit, Ride Control Circuit, Float Control Circuit, Self Level Circuit, Auxiliary Hydraulics Female Coupler Circuit, Auxiliary Hydraulics Male Coupler Circuit |
| Troubleshooting and Component Testing | 202-264 | Work Lights Circuit, Instrumentation, Horn Circuit, Backup Audible Alarm, Component Testing, Relay Test, Key Switch Test, Sensor Testing |
| Hydrostatic Power Train | 265-370 | Hydrostatic Power Train Schematics, Theory of Operation and Diagnostic Information, Troubleshooting |
| Hydraulics | 371-460 | Hydraulic Schematic, Theory of Operation and Diagnostic Information, Test and Adjustments |
| Wanda Diagnostics and Configuration | 461-506 | Diagnostics, Configuration |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Engine Oil Capacity (SW16, SW20) | 7.9 qt (7.5 L) | p. 27 |
| Engine Oil Capacity (SW17, SW21, ST28, ST31) | 10.3 qt (9.8 L) | p. 27 |
| Hydraulic oil filter micron rating | 4 Micron | p. 331 |
| Case drain manifold micron rating | 100 Micron | p. 331 |
| Hydraulic Oil Capacity | 31.2 qt (29.5 L) | p. 27 |
| Diesel Fuel Capacity | 30 gallon (114 L) | p. 27 |
| Drive Chain Tension | 0.38 in. (9.65 mm) - 0.5 in. (12.7 mm) | p. 26 |
| Track Tension | 0.75 in. (19 mm) gap | p. 26 |
| SW16, SW20 | ||
| Engine Oil Capacity (SW16, SW20) | 7.9 qt (7.5 L) | p. 27 |
| Engine Coolant Capacity (SW16, SW20) | 14.5 qt (13.7 L) | p. 27 |
| SW17, SW21, ST28, ST31 | ||
| Engine Oil Capacity (SW17, SW21, ST28, ST31) | 10.3 qt (9.8 L) | p. 27 |
| Engine Coolant Capacity (SW17, SW21, ST28, ST31) | 15.5 qt (14.7 L) | p. 27 |
