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Bobcat S150, S160 2006 Service Manual – OEM Factory Repair Specs

I’ve worked on enough skid-steers to know that the wrong manual will cost you a day of billable time – or worse, a trip to the ER. This Bobcat S150, S160 2006 Service Manual is the real deal: factory-issued, 929 pages, and written for technicians who need exact numbers, not guesswork. If you’re rebuilding a hydraulic control valve or chasing an engine oil leak, you want the document that Bobcat dealerships used. Aftermarket reprints leave out the footnotes that keep your lift arms from dropping on your head.

Look at the table of contents: it starts with Safety Instructions and Fire Prevention before you even get to the serial number locations. That’s not padding – that’s the difference between walking away and getting hurt. The manual then hits every major system: engine cooling, fuel, lubrication, hydraulic/hydrostatic, final drive chaincase, fan gearbox, Bob-Tach, and the full hydraulic schematics. Each section includes torque values, fluid capacities, and stepwise disassembly. No skipping steps.

Engine Lubrication System: Oil and Filter Change

You need the correct oil viscosity for the ambient temperature in San Antonio – this manual gives you the chart. The section on Replacing Oil And Filter walks you through draining, filter removal, and priming. It also warns you to keep the engine off and cooled before opening anything. I’ve seen guys skip that and get third-degree burns. The manual lists the exact torque for the drain plug and filter canister. Don’t guess; use the spec.

What Torque Specs Are You Working With?

Under Hydraulic System Information, there’s a dedicated Tighten Procedures subsection. That’s where you find the foot-pounds for cylinder rod ends, valve mounting bolts, and the main relief valve. Aftermarket manuals often round these up or down – this one gives you the factory number. For the lift cylinder base end pivot pin, the manual tells you to tighten to a specific value then check with a feeler gauge. That kind of detail keeps seals from blowing out at 3,000 psi.

7 Major Systems Covered in This 929-Page Manual

Here’s what you get:

• Engine cooling system – cleaning, coolant replacement, check procedure
• Fuel system – specs, filter, air purge
• Hydraulic/hydrostatic system – fluid level, filter change, breather cap
• Final drive transmission (chaincase) – oil check and removal
• Fan gearbox – maintenance
• Bob-Tach and Power Bob-Tach – inspection and lubrication
• Tire maintenance – wheel nut torque, rotation, mounting

Each of these sections includes a troubleshooting chart and a step-by-step sequence. The Hydraulic/Hydrostatic Schematics page gives you a full diagram of the circuit, so you can trace pressure drops without pulling apart everything.

Safety First – Lift Arm Support Device

Page after page, the manual reminds you: never go under raised lift arms without an approved support device. The Lift Arm Support Device section shows installation and removal with drawings. It also covers the Emergency Exit procedure from the operator cab. If you’re working on a BICS™ system (Bobcat Interlock Control), the manual explains how the solenoid and lock valve function – and how to test them safely. I’ve seen too many guys prop the arms with a 2×4. This manual will set you straight.

Follow the Hydraulic Control Valve Disassembly Steps

Both the foot control and Advanced Control System (ACS) valves get their own multi-page breakdown. The manual details removal of the BICS™ valve, check valve, lock valve, and solenoid. It gives you the Cleaning And Inspection checklist after disassembly. For the ACS version, there’s a separate Actuator Removal And Installation procedure. If you’re rebuilding a valve that leaks down, you need this section – not a generic YouTube video. The manual uses actual part numbers and assembly torques.

For general transmission knowledge, see Manual Transmission on Wikipedia. Also, if you’re servicing a different machine, consider the Manual Transmission principles apply to gearbox work.

Does this manual cover the Advanced Control System (ACS)?

Yes. The ACS hydraulic control valve section includes actuator removal, solenoid testing, and spool disassembly.

How is this different from aftermarket manuals I find online?

This is the original OEM document – 929 pages, printed in 2006 by Bobcat. Aftermarket copies often omit the safety warnings, misprint torque values (I’ve seen a 20% error on lift cylinder rod nut torque), and lack the BICS™ solenoid testing steps. The factory manual includes the exact page: the BICS™ Valve Solenoid Testing procedure with resistance values. No third-party reprint can guarantee that. Your loader’s hydraulic system runs at 3,000+ psi. A wrong spec can blow a seal or drop the arms. This manual gives you the information Bobcat trained their own techs on.

You’ve got a loader that needs real work – not a guessing game. Access the Factory Manual and get the same PDF that dealerships reference. Stop chasing ghosts and start turning wrenches with the right specs.

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