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 Wacker Neuson SW24, SW28, ST35, ST45 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 |
Wacker Neuson SW24, SW28, ST35, ST45 Common Problems This Manual Covers
Wacker Neuson ST45 auxiliary hydraulics suddenly weak running attachments, oil sounds like it's bypassing the valve
Test relief pressures before condemning the pump. Verify the main relief valve holds 3480 psi (240 bar) per the adjustment procedure on page 419, and confirm gear pump operating pressure reaches 3626 psi (250 bar). If pressure falls short, inspect the flat-face coupler check valves for sticking, then adjust or replace the relief cartridge.
Manual Section: Hydraulics p. 419Hydraulic oil temperature buzzer sounds during heavy cycles, oil overheats even in mild weather
Shut down and let the oil cool before touching anything. Clean the hydraulic oil radiator fins with compressed air, blowing from the fan side out. Check the reservoir level; the system holds 42.3 qt (40 L), listed on page 30. Replace the hydraulic oil filter if the dirty-filter buzzer has also been sounding.
Manual Section: Hydraulics p. 417Engine starts then stalls and shuts off after a few seconds, no obvious fuel leak
Check fuel level and condition first, then bleed the fuel system and inspect suction lines for air leaks. Verify engine oil level before restarting; SW28, ST35 and ST45 engines hold 16.5 qt (15.6 L). Connect the Wanda diagnostic software, covered starting on page 505, and read active fault codes before replacing parts.
Manual Section: Wanda Diagnostics and Configuration p. 505Drive hydraulics feel weak climbing grades or pushing into the pile, sluggish in one direction
Test charge pressure at the hydrostatic pump before pulling drive motors; spec is 406 psi (28 bar), found on page 345. Low charge pressure points to a clogged filter or weak charge relief valve. If charge pressure checks good, run the drive diagnostics in the Hydrostatic Power Train section starting on page 343.
Manual Section: Hydrostatic Power Train p. 345Boom drifts down under load, lift arms won't hold a full bucket at height
Measure cylinder leak down with a loaded bucket raised and the engine off. Anything beyond 0.24 in. (6 mm) per hour, the spec on page 419, means the cylinder seals or loader valve are passing oil. Rebuild the boom cylinders with new seal kits, then retest before condemning the valve section.
Manual Section: Hydraulics p. 419Frequently Asked Questions
What are the replacement specifications for the hydraulic oil filter?
The hydraulic filter for the 50-hour service on SW16, SW17, SW20, SW21, ST28, and ST31 (T4) machines is part number 1000359349. For a wider range of machines including SW23, SW24, SW28, ST35, ST45, ST40, and ST50, the hydraulic filter part number is 1000382918. p. 31
What are the replacement specifications for the primary air filter?
The primary air filter for the 500-hour service on machines with 2504M engines is part number 1000370137. This same part number is also used for 500-hour service on 1903/2504 TCR and 2504 TCRD engines. p. 31
What is the torque specification for the drive motor bolts?
The torque specification for the drive motor bolts is 214 lb-ft (290 N•m). p. 345
What is the charge pressure specification for the hydrostatic system?
The charge pressure specification for the hydrostatic system is 406 psi (28 bar). p. 345
What is the capacity of the engine coolant for the ST40 and ST50 models?
The engine coolant capacity for the ST40 and ST50 models is 21.8 qt (20.6 L). p. 30
What do I get after purchasing this Wacker Neuson SW24 manual?
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