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 Wacker Neuson SW16-SW21, ST28-ST31 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 |
Wacker Neuson SW16-SW21, ST28-ST31 Common Problems This Manual Covers
Wacker Neuson ST28 pulls to one side, jerky travel, machine not tracking straight
Check track tension before blaming the drive motors. Raise the machine, measure the sag at the middle roller, and adjust the grease tensioner until you have the 0.75 in. (19 mm) gap specified on page 26. If tension checks out, follow the hydrostatic diagnostic procedures starting on page 265 to isolate which pump side is pulling low.
Manual Section: Hydrostatic Power Train p. 265Bucket slow to curl, lift arms struggle under load, whole hydraulic system feels weak
Verify hydraulic oil level first; the system holds 31.2 qt (29.5 L). Then tee a gauge into the loader circuit and test main relief pressure against the 3481 psi (240 bar) setting on page 373. Low readings across every function point to the relief valve or gear pump, so replace the 4 micron filter element while the system is open.
Manual Section: Hydraulics p. 373Engine cranks slowly or will not start, no response from key switch some mornings
Check battery terminals and ground cables for corrosion before chasing sensors; clean and retighten both ends. Confirm the seat interlock is satisfied, then work through the start circuit procedure. If it cranks but will not fire, verify fuel supply from the 30 gallon (114 L) tank and change the fuel filter.
Manual Section: Start Circuit Troubleshooting p. 27Boom drifts down under load, bucket loses curl position while machine sits
Measure the drift before replacing parts. Raise a loaded bucket, mark the cylinder rod, and check movement over one hour; anything past 0.24 in. (6 mm) per hour exceeds the leak down limit on page 373. Swap boom and bucket hoses at the loader valve to tell a leaking cylinder seal from a worn valve section.
Manual Section: Hydraulics p. 373Auxiliary hydraulics weak or completely dead, attachment motor stalls out under light load
Test flow at the couplers with a flowmeter; a healthy circuit delivers 15 GPM (57 LPM) per the spec on page 373. Inspect both quick couplers for a stuck check ball and reseat them fully, since a half seated female coupler kills flow. If flow tests good, run the electrical checks in the troubleshooting procedures starting.
Manual Section: Auxiliary Hydraulics Troubleshooting p. 373Frequently Asked Questions
What are the replacement specifications for hydraulic filters?
The 1000 Hour Service Kit includes a hydraulic filter with part number 1000359349. p. 28
What is the recommended engine oil capacity for the SW16 and SW20 models?
The engine oil capacity for the SW16 and SW20 models is 7.9 qt (7.5 L). p. 27
What is the correct drive motor bolt torque specification?
The drive motor bolt torque is 214 lb-ft (290 N•m). p. 268
What is the hydrostatic pressure relief setting?
The hydrostatic pressure relief setting is 406 psi (28 bar). p. 268
What do I get after purchasing this Wacker Neuson SW16 manual?
Instant PDF download. You get the full 506-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Are there any print restrictions on this Wacker Neuson SW16 manual?
You can. The PDF is unlocked and carries no copy protection, so print the sections you want and keep the file as your backup.
Are there hydraulic schematics in this Wacker Neuson SW16 manual?
Yes, this Wacker Neuson SW16 & variants Service Manual includes hydraulic system diagrams, circuit schematics, and component specifications. There is one on page 271, for example.
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