Wacker Neuson printed this book itself: document 1000291439, the 307-page factory service manual for the EZ28 track excavator, the same material its own dealer techs work from. As a Wacker Neuson EZ28 service manual PDF it holds the hydraulic schematics that trace pilot oil from the double variable displacement pump through the main valve block, and wiring diagrams that let you chase a fault across relays, fuses, and harnesses. Both Yanmar engines fitted over the production run, the 3TNV76-NNS and the later 3TNV80F-SNNS, get separate service chapters. Set valve clearance to 0.15 to 0.25 mm cold, then pull your live ring bolts down to 110 Nm straight from the technical data section. One half-remembered torque figure can crack a cylinder head. Bookmarks and a genuine text layer put the page you need on screen in seconds.
What's Inside This Wacker Neuson EZ28 Manual
| System | Pages | Key Topics |
|---|---|---|
| Operation | 12-41 | Information on This Service Manual, Identification of Warnings and Dangers, Explanation of Symbols and Abbreviations, Conversion Table, Designated Use and Exemption From Liability |
| Engine | 130-169 | Overview of Engine 3TNV76-Nns, Fuel System, Cooling System, Checking and Adjusting Valve Clearance |
| Hydraulic System | 170-205 | Hydraulic Pump (Double Variable Displacement Und Twin Gear Pump Pvd-0B-23BP-8G3-5083A, Pump Unit: Exploded View, Pilot Oil Supply Unit, Double Variable Displacement Und Twin Gear Pump Pvd-0B-23BCP-8G3-5498Z, Dismantling the Hydraulic Pump, Assembling the Hydraulic Pump, Malfunctions of the Hydraulic Pump) |
| Electrical System | 206-307 | Relays, Fuses and Relays, Wiring Harnesses |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder-head bolt | 59 – 63 Nm | p. 49 |
| Connecting rod bearing screw | 22.6 – 27.5 Nm | p. 49 |
| Metric hose fittings (light execution) 05 6L | 15 Nm | p. 50 |
| Metric hose fittings (light execution) 08 10L | 40 Nm | p. 50 |
| Valve clearance (intake = outlet) | 0.15 – 0.25 mm | p. 42 |
| Compression (Yanmar 3TNV76-NNS) | 23.5 +/- 1 bar | p. 42 |
| Track tension play | 20 – 25 mm (0.8 – 1 in) | p. 115 |
| Engine Oil Capacity | 3.4L | p. 61 |
| Hydraulic Oil Reservoir Capacity | 30L | p. 45 |
| Hydraulic System Total Fill | 42L | p. 45 |
| Fuel Tank Capacity | 36L | p. 43 |
| Cylinder-head bolt tightening torque (1st pass) | 29.5 – 31.5 Nm | p. 135 |
Wacker Neuson EZ28 Common Problems This Manual Covers
Wacker Neuson EZ28 loses all hydraulic function, joysticks feel dead, no response from any control
Check the ISO/SAE control pattern selector first; a half-engaged selector kills every function on this machine. Inspect the pilot oil supply unit and pilot circuit for blockage or leaks, starting from the hydraulic system section on page 170. Verify oil level too; the reservoir holds 30 L (page 45) before you condemn the pilot pump.
Manual Section: Hydraulic System p. 170Travel drive growling or whining, machine pulls to one side, weak or no travel
Check track tension before blaming the final drive; play should measure 20 to 25 mm (0.8 to 1 in) per page 115. Drain the travel gearbox oil and inspect it for metal. If the drive unit is coming off, torque the traveling drive screws to 110 Nm and track rollers to 180 Nm on reassembly, per page 49.
Manual Section: Hydraulic System p. 170Engine cranks but will not start, or starts hard and runs rough when cold
Verify fuel level and bleed the fuel system; the tank holds 36 L. Test compression at 250 rpm; the 3TNV76-NNS should read 23.5 +/- 1 bar per the specs on page 42. A low cylinder points to tight valves, so check and reset clearance to 0.15 to 0.25 mm, intake and exhaust (page 134).
Manual Section: Engine p. 130Engine down on power under load, black exhaust smoke, will not reach full throttle speed
Measure engine speed first; max no-load spec is 2675 +/- 25 rpm and idle is 1300 +/- 25 rpm, both on page 42. Replace fuel and air filters, then pop-test the injectors; opening pressure must fall between 118 and 128 bar (page 136). Reset valve clearance to 0.15 to 0.25 mm while the cover is off.
Manual Section: Engine p. 130Hydraulic pump whining or vibrating, cycle times slow, oil running hot within an hour
Check oil level and condition; the reservoir takes 30 L and the full system 42 L (page 45). Verify the return filter is not bypassing; its control pressure is 2.5 bar (36 psi), covered on page 109. Inspect the suction side for air leaks and retorque loose metric hose fittings, 40 Nm for the 10L size (page 50).
Manual Section: Hydraulic System p. 170Frequently Asked Questions
How do I reset the maintenance meter on the Wacker Neuson EZ28?
To reset the maintenance meter, select the meter with switch A, then press switch B. Enter the factory-set code '12345' using switch A to select digits and switch B to confirm. Once the code is entered correctly, the meter will reset to the preset value of 500 operating hours. p. 128
What are the tightening torque specifications for the cylinder-head bolts on the EZ28 engine?
The cylinder-head bolts must be tightened in two passes. The first pass requires 29.5 – 31.5 Nm (21.5 – 23 ft.lbs.), and the second pass requires 59 – 63 Nm (43.5 – 46.5 ft.lbs.). p. 135
What is the correct valve clearance for the EZ28 engine?
The valve clearance for both intake and exhaust valves on the EZ28 engine should be set to 0.15 – 0.25 mm (0.0059 – 0.0098 inches) when the engine is cold. p. 134
What is the engine oil capacity for the EZ28?
The engine oil capacity for the EZ28 diesel engine is approximately 3.4 liters (0.9 gallons). p. 61
What is the recommended interval for replacing the hydraulic oil filter insert?
The hydraulic oil filter insert should be replaced for the first time after 50 operating hours, and then every 500 operating hours thereafter under normal working conditions. p. 62
Will this Wacker Neuson EZ28 Service Manual download right away?
You download the Service Manual yourself: 307 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Can I print just the pages I need from this Wacker Neuson EZ28 manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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