A Wacker Neuson 1404, ET16 service manual PDF puts 256 pages of factory repair data behind two compact track excavators, published under OEM ID 1000166693, and that count is what separates guessing at a pilot circuit from fixing it. Hydraulic schematics map both 1404 diagram versions plus the ET 16 second-driving-speed circuit, and exploded views break down the AZPS-11-014 gear pump and SX 10 main valve block piece by piece. Wiring coverage runs from the main fuse box and relay connector assignment through the instrument panel, and pressure-check procedures walk you through setting pilot pressure and the secondary limiting valve. Torque the live ring bolts to 180 Nm and pull cylinder-head bolts down in sequence to 53.9 to 57.9 Nm (or 59 to 63 Nm depending on the engine model). Sooner or later it is just you, the machine, and nobody on the radio who knows this excavator. The text layer and multi-level bookmarks in this PDF answer faster than a phone call; download it and see.
What's Inside This Wacker Neuson 1404, ET16 Manual
| System | Pages | Key Topics |
|---|---|---|
| Operation | 12-35 | Notices on This Service Manual, Identification of Warnings and Dangers, Explanation of Symbols and Abbreviations (Conversion Table) |
| Engine | 114-153 | Overview of Engine 3TNV76-SNS2, Fuel System, Cooling System |
| Hydraulic System | 154-193 | How the Load-Sensing Control Works, Overview of Hydraulic Components, Gear Pump Azps-11-014 Rrr 20 Mb-N (Pump Unit Exploded View, Pilot Oil Supply Unit, Pilot Oil Control Unit) |
| Electrical System | 194-256 | Fuses on Control Lever Base on the Left, Main Fuse Box with Relays, Relay Connector Assignment, Instrument Panel Overview, V Power Outlet, Power Outlet, Control Lever Push Button |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder-head bolt | 53.9 – 57.9 Nm | p. 38 |
| Connecting rod bearing screw | 22.6 – 27.5 Nm | p. 38 |
| Starter | 1.1 kW | p. 41 |
| Battery (up to serial no. AF05342) | 45 Ah | p. 41 |
| Battery (from serial no. AF05343) | 44 Ah | p. 41 |
| F2 | 10 A | p. 41 |
| F3 | 10 A | p. 41 |
| Breather filter opening pressure | 0.4 bar (5.8 psi) | p. 182 |
| Breather filter opening pressure (from serial no. AG04029) | 0.2 bar (2.9 psi) | p. 182 |
| Engine Power | 13.2 kW at 2200 rpm | p. 36 |
| Engine Oil Capacity | 3.4 L | p. 38 |
| Fuel Tank Capacity | 24 L | p. 38 |
Wacker Neuson 1404, ET16 Common Problems This Manual Covers
Wacker Neuson ET16 starter intermittently fails to engage, key turned repeatedly before engine finally cranks
Check battery voltage and terminals first; the machine runs a 12 V 44 Ah battery, listed on page 196. Load-test it before condemning the starter. Verify the 50 A main fuse for starter and preheating on the wiring diagram, page 207. If power checks good, pull the 1.1 kW starter and inspect the solenoid contacts for wear.
Manual Section: Electrical System p. 196Engine overheats during steady digging, temperature buzzer sounds and coolant warning light stays on
Shut down and let the engine cool, then blow out the radiator fins with compressed air from the fan side. Verify coolant level in the reservoir and check engine oil; the sump holds 3.4 L, per page 38. Pressure-test the cooling circuit for leaks following the engine section starting on page 114.
Manual Section: Engine p. 114Boom, arm, and swing controls do not respond after startup, pilot circuit dead
Lower the control lever base fully; the pilot control circuit stays locked out until it seats. Check the 10 A valves and horn fuse on the wiring diagram, page 207. If the pilots are still dead, verify the main circuit reaches its 200 bar operating pressure, then trace the pilot oil supply unit in the hydraulic section, page 154.
Manual Section: Hydraulic System p. 154Hydraulic functions weak or slow, boom and bucket cylinders jerky under load
Check hydraulic oil level first; the reservoir holds 20 L with a total system fill of 35 L, listed on page 38. Test the reservoir breather filter, opening pressure 0.4 bar (5.8 psi), or 0.2 bar from serial number AG04029, covered on page 182. A plugged breather starves the pump and mimics a worn one.
Manual Section: Hydraulic System p. 182Immobilizer refuses coded key, drive interlock keeps engine from cranking
Check the 10 A fuse for the rotating beacon, radio, and immobilizer on the wiring diagram, page 207. Verify the battery holds near 12 V under load; a weak supply drops the antitheft module offline. Then run the key coding and deletion procedure in the drive interlock troubleshooting section and retest each coded key.
Manual Section: Drive Interlock (Antitheft) TroubleshootingFrequently Asked Questions
What are the torque specifications for the cylinder-head bolts on the 1404 / ET16 engine?
The cylinder-head bolts for the 1404 / ET16 engine should be tightened in two stages. For the 3TNV76 engine (page 119), the first position requires 26.9–28.9 Nm (19.8 - 21.3 ft.lbs.), and the second speed requires 53.9–57.9 Nm (39.8 – 42.7 ft.lbs.). For the 3TNV80F engine (page 137), the first position requires 29.5 – 31.5 Nm and the second speed requires 59–63 Nm. p. 119
What is the engine oil capacity for the 1404 / ET16?
The engine oil capacity for the 1404 / ET16 is 3.4 liters (0.9 gallons), filled up to the maximum mark on the dipstick. p. 38
What is the correct valve clearance for the 1404 / ET16 engine?
The valve clearance for both intake and exhaust valves on the 1404 / ET16 engine should be set between 0.15 mm and 0.25 mm (0.0059 – 0.0098 inches) when the engine is cold. p. 36
How often should the hydraulic oil filter be replaced?
For normal excavation work, the hydraulic oil filter insert should be replaced for the first time after 50 operating hours, and then every 500 operating hours thereafter. p. 53
What is the specified injection pressure for the 1404 / ET16 injection nozzles?
The injection pressure for the 1404 / ET16 injection nozzles is specified between 123 and 133 bar (1784 – 1929 psi). p. 138
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