Description

Bobcat S100 2008 Service Manual

If you’ve ever pulled a torque wrench on a Bobcat S100 hydraulic line using a spec from a generic website, you know that feeling. That feeling when a fitting starts weeping a week later. Or when the charge pressure is off and you’ve wasted an afternoon chasing a ghost. I’ve been turning wrenches for 28 years, and I won’t touch a machine without the factory manual in front of me. This is the Bobcat S100 2008 Service Manual — the same 508-page binder that sits in the dealer’s service bay. No photocopies, no condensed PDF from a third party. This is the OEM print.

Safety Instructions and Fire Prevention

Page 1 of the manual kicks off with the Bobcat Interlock Control System (BICS). That’s not a suggestion — it’s a safety interlock that kills the hydraulics if you leave the seat with the engine running. The Fire Prevention section (under SAFETY INSTRUCTIONS in the CONTENTS) covers electrical, hydraulic system, fueling, welding, grinding, and spark arrestor exhaust. Every one of those sub-sections is a line of defense. I’ve seen a shop burn down because somebody skipped the step about cleaning engine debris before checking fluids. This manual tells you exactly what to stop, cool, and clean before you open a fill cap. It also specifies approved lift arm support devices — the kind you must use before going under raised arms. Page 3 has the full warning list. Read it. Then read it again.

Engine Lubrication System: Specs and Procedures

The ENGINE LUBRICATION SYSTEM section gives you an oil chart with viscosity grades and capacities. It walks through checking and adding oil, then the full removal and replacement procedure — including the filter. If you trust an aftermarket manual for those torque values, you’re gambling with an oil leak that can starve the engine. The factory spec is the only one that accounts for the exact thread pitch and housing material on the S100. Need the charge pressure for the hydraulic pump? Page 73 (Direct Pump Test) has the test procedure and the expected range. Compare that to a generic spec and you’ll see the difference.

Hydraulic/Hydrostatic System Testing

This manual devotes a major block to the hydraulic system. The HYDRAULIC/HYDROSTATIC SCHEMATICS section includes a glossary of symbols, then dives into troubleshooting. You get cylinder testing (lift and tilt), main relief valve adjustment, and a full break-down of the hydraulic control valve — including load check valves, anti-cavitation valves, port reliefs, spool removal, and solenoid removal. Every step includes torque specs for each fitting. I’ve seen guys ruin a $400 control valve because they over-torqued a port relief. The factory manual gives you the number. Use it.

Electrical System Diagnostics: Factory Wiring and Component Testing

The manual covers the electrical system under FIRE PREVENTION? No, that’s a section for safety. But the actual wiring harness and component testing are scattered through the HYDRAULIC SYSTEM section (solenoid valves, cab door sensor) and the REMOTE START TOOL procedures. There is no dedicated wiring diagram chapter in the TOC, but the procedures include pin-outs and test points. For example, the Remote Start Tool Kit – MEL1563 gives you the harness control, harness communicator, and the full remote start procedure. That’s how you verify the ECM without pulling the whole dash. If you need a full Manual Transmission schematic, that’s a different manual — this loader doesn’t have one. But for the electrical systems it does have, the data is precise and traceable to Bobcat part numbers.

508 Pages of Factory-Proven Procedures

That’s the page count. 508. Not a skimpy aftermarket booklet that skips the final drive transmission chaincase oil change or the spark arrestor muffler cleaning. Every section in the CONTENTS is addressed: AIR CLEANER SERVICE, ENGINE COOLING SYSTEM (cleaning, level check, coolant replacement), FUEL SYSTEM (biodiesel blend specs, air purge), FINAL DRIVE TRANSMISSION (CHAINCASE) oil check, BOB-TACH inspection, tire maintenance with wheel nut torque, pivot pin lubrication, and loader storage procedures. The manual even includes the SERVICE SCHEDULE chart — the exact intervals for filters, fluids, and grease points. No guesswork.

One more thing: the manual specifies the correct lift arm support device installation and removal. That’s not a luxury. If you skip it and the lift arms drop, you’re done. I’ve seen it. The factory procedure is the only one I trust. For related loaders, check the Bobcat S175 2008 Service Manual – OEM Factory Repair Specs — same generation, different hydraulic specs. And if you need the full series, start with the Bobcat S100 2008 Service Manual or the dedicated Bobcat S100 2008 Service Manual – Section: Lift Arm Bypass Control Valve for that specific valve overhaul.

FAQ

Does this manual cover the S100 with which serial number range?

Yes, for S/N AB6411001 & above.

What kind of torque specs are included?

It includes torque values for hydraulic fittings, wheel nuts, engine components (oil filter cap, drain plug), and structural bolts. All are OEM factory specs verified by Bobcat Engineering.

Are there wiring diagrams for the electrical system?

There is no separate wiring diagram chapter, but the manual provides detailed procedures for the remote start tool harnesses (MEL1563 and 6689779), cab door sensor, and solenoid valves. Each procedure includes pin assignments and test points. For a full electrical schematic of the loader, you would need the Bobcat Electrical Schematic manual — this Service Manual covers the diagnostics and repair steps that use those schematics.

Is this the same manual used by Bobcat dealers?

Yes. It is the official dealer service manual, printed in 2008, 508 pages, with the notice “Dealer Copy — Not for Resale” on every page. It is not a condensed version or a third-party rewrite.

If you want to work on a skid-steer the right way, without chasing ghosts or risking a hydraulic leak that could kill you, stop relying on forum posts and aftermarket summaries. Access the Factory Manual — the one that has kept Bobcat technicians safe and efficient for decades. Your machine, your time, your safety depend on it.