An hour from now you could have a gauge teed into the micro ports of a 901s, and this Wacker Neuson 901s, 901sp service manual PDF puts the target numbers beside you: 234 pages of factory service data for both compact loader variants under OEM ID 1000188511. Hydraulic schematics come in ISO standard and H controls versions for each machine, every one with a legend, and the wiring section traces each harness by part number: cab, chassis, front lights, even the Austrian road-traffic kit. Pressure-check procedures run from preparatory work through the parking brake release circuit and the 901sp Power Flow option. Set the main system to 345 bar (5004 psi), boost to 26 bar, and pull wheel nuts to 175 Nm. Guess a pressure and you find out the hard way when a fitting lets go at full flow. Print what you need; the searchable original stays clean while the bench copy takes the grease.
What's Inside This Wacker Neuson 901s, 901sp Manual
| System | Pages | Key Topics |
|---|---|---|
| Documentation | 2 | Index of Related Bomag Publications (Each Sold Separately) |
| Operation | 11-28 | Notices on This Service Manual, Identification of Warnings and Dangers, Designated Use and Exemption From Liability, Type Labels and Component Numbers, Machine Overview |
| Specifications | 29-40 | Chassis, Travelling Drive, Brakes, Work Hydraulics, Pilot Control, Additional Power Flow Control Circuit |
| Engine | 101-126 | Engine D2011 L04W (Td2011 L04W), Fuel System, Fuel System From Serial No. DC01288, Checking and Adjusting Valve Clearance, Checking and Adjusting the Fuel Injectors |
| Hydraulic System | 127-168 | Rexroth AA20 VG45 Hydraulic Pump (Unit: Exploded View, Distribution), Main Valve Block (Ports, Legend, Diagram) |
| Electrical System | 169-212 | Ohm’s Law; Power, Measuring Equipment, Measuring Methods, Cable Colour Coding, Relays (Use, Mode of Function) |
| Options | 213-234 | Rear Working Lights (Wiring Harness, Connections), Bp – Biohyd Se 46 (Properties), Biodegradable Oil Panolin (Properties), Rearview Mirror Package, Extra Weight |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Wheel nuts | 175 Nm | p. 34 |
| Nuts for Airboss tyre segments | 13 Nm | p. 34 |
| Max. system operating pressure | 345 bar (5004 psi) | p. 31 |
| Charging/boost pressure | 26 bar (377 psi) | p. 31 |
| Return filter pressure switch control pressure | 5 bar (72.5 psi) | p. 85 |
| Fuel Tank Capacity | 72 l | p. 31 |
| Engine Oil Capacity (max) | 10 l | p. 31 |
| Cylinder-head bolt tightening torque (1st pass) | 41.1 – 46.9 Nm | p. 31 |
| Wheel nut tightening torque | 175 Nm | p. 35 |
| Hydraulic oil tank capacity | 35 l | p. 33 |
| 901s | ||
| Engine Output (901s) | 50 kW at 2600 rpm | p. 30 |
| 901sp | ||
| Engine Output (901sp) | 63 kW at 2500 rpm | p. 30 |
Wacker Neuson 901s, 901sp Common Problems This Manual Covers
Wacker Neuson 901s cranks slowly or starter clicks without engaging, intermittent no-start cold mornings
Test battery voltage under crank load and clean both ground straps before condemning the starter. Check the 80 A main fuse listed on page 34, then run continuity tests through the starter solenoid circuit using the wiring diagram on page 180. Replace corroded connectors; fault codes E001 and E011 point here.
Manual Section: Electrical System p. 180Bucket won't lift and drive feels weak, hydraulic functions slow when oil warms up
Check hydraulic oil level in the 35 l tank shown on page 33 before pulling gauges. Test work hydraulics pressure against the 210 bar (3046 psi) maximum on page 32; low readings mean a worn Rexroth pump or stuck relief valve. Replace clogged return filters and inspect suction lines for collapse.
Manual Section: Hydraulic System p. 127Warning light stays on with no fault code text shown on the display
Verify battery and charging connections first, since low voltage triggers stored electronic faults. Check the return filter pressure switch, which trips at 5 bar (72.5 psi) per page 85, then work through the continuity and diode test methods in the electrical section starting on page 169. Record codes like E210 or H011 for the dealer scanner.
Manual Section: Electrical System p. 169Engine runs rough and lacks power under load, blows dark smoke uphill
Replace the air filter element and check the dust valve before chasing fuel problems. Measure charge-air pressure against the 0.9 bar (13 psi) plus or minus 10 % spec on page 123, and set valve clearance cold to 0.3 mm intake and 0.5 mm exhaust per page 30. Bleed the fuel system after any filter change.
Manual Section: Engine p. 101Clunk from wheel hubs after tyre change, wheel nuts keep working loose
Torque wheel nuts to 175 Nm (129 ft.lbs.) as shown on page 90, working a cross pattern, and recheck after the first hour of operation. Tighten Airboss tyre segment fastening nuts to 13 Nm (9.6 ft.lbs.) per page 91. Inspect studs and hub mating faces for rust or paint before mounting.
Manual Section: Specifications p. 35Frequently Asked Questions
What are the torque specifications for the wheel nuts on the Wacker Neuson 901S?
The wheel nuts on the Wacker Neuson 901S must be tightened to a torque of 175 Nm (129 ft.lbs.). p. 90
What are the replacement battery specifications for the Wacker Neuson 901s, 901sp?
The battery for the Wacker Neuson 901S/SP is a 12 V 88 Ah unit. p. 34
What is the specified valve clearance for the Wacker Neuson 901s, 901sp engine?
The valve clearance for both intake and outlet valves on the engine is 0.3+0.1/0.5+0.1 mm (0.012/0.02") when cold. p. 30
What is the tightening torque for the cylinder-head bolts on the Wacker Neuson 901s, 901sp?
The cylinder-head bolts require a three-pass tightening procedure: 30 Nm (22 ft.lbs.) for the first pass, 80 Nm (59 ft.lbs.) for the second pass, and 160 Nm (118 ft.lbs.) for the third pass, followed by a 90° retightening angle. p. 120
Is this manual a download or a disc?
This is a 234-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this manual print-friendly?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Reviews
There are no reviews yet.