Description

Bobcat S150 2008 Service Manual

If you’ve ever had a skid-steer loader eat a hydraulic pump because you trusted a reprint manual’s torque chart, you know why I’m writing this. I’m Mike Callahan, 28-year ASE Master Tech. I’ve seen aftermarket manuals skip the fire prevention section, list wrong wheel nut torque, and leave out the damn lift arm support device procedure. That gets people killed. This Bobcat S150 2008 Service Manual is the factory original – 802 pages, printed in 2008, and it covers every service procedure from the Bobcat Interlock Control System (BICS) on page 1 to the hydraulic case drain filter replacement. No shortcuts, no missing pages.

Fire Prevention and Electrical Safety

Page 3 of this manual lays out the safety instructions for fire prevention: maintenance, operation, electrical, hydraulic system, fueling, starting, spark arrestor exhaust, and welding/grinding. The electrical subsection specifically warns about battery explosion and acid burns. You need the factory wiring diagrams? They aren’t in the TOC as a standalone chapter, but the hydraulic system section includes electrical schematics for the BICS and remote start tools. The manual covers the Electrical system in the fire prevention context and the remote start tool harness – part numbers MEL1565 and MEL1566 are listed for the first kit, and 6689747/6689746 for the second. Don’t guess when pulling a harness.

Lift Arm Support Device: Not Optional

I’ve pulled more than a few guys out from under machines that didn’t have a proper support device. The manual gives you the exact procedure for installing and removing the lift arm support device. It shows the correct tool (B-15590, B-15591, etc.) and tells you to replace it if damaged. The wrong block or a stacked jack is a death sentence. If you’re doing cylinder work or chaincase service, follow the lifting and blocking procedure in the SAFETY AND MAINTENANCE chapter. No exceptions.

Hydraulic System Troubleshooting and Schematics

The hydraulic/hydrostatic schematics section includes a glossary of symbols and a troubleshooting guide. It covers the main relief valve – testing, adjusting, removal and installation. For the lift cylinder, tilt cylinder, and Bob-Tach cylinder, you get full disassembly and assembly with parts identification. The manual also details the hydraulic control valve, including load check valves, anti-cavitation valves, and port relief valves. Every plug removal and installation is listed. This is the level of detail that aftermarket reprints leave out. You need the charge filter replacement procedure? It’s in the hydraulic system service section, along with case drain filters for single speed and two-speed loaders.

Engine Lubrication and Cooling System Specs

The Engine chapter covers fuel specifications (including biodiesel blend), air cleaner service, cooling system cleaning and coolant replacement, and the engine lubrication system with oil chart and filter removal. The manual gives you the service schedule chart on page 1? Actually the schedule is in SAFETY AND MAINTENANCE – you’ll find the interval for oil and filter change, hydraulic fluid change, and chaincase oil. Torque specs for drain plugs and filters are factory-verified. Don’t use generic values for the S150 – the engine oil capacity is specific to the loader. Check the chart under Engine Lubrication System.

Source Authenticity: Why OEM Beats Aftermarket

This manual is a dealer copy – printed by Bobcat Company in 2008, marked “Dealer Copy — Not for Resale.” The TOC alone runs 17 pages of procedures. Aftermarket versions often omit the Remote Start Tool Kit procedures (MEL1563 and 6689779), which are critical for diag without the engine running. They also skip the Spark Arrestor Muffler cleaning and the BICS system description. If you want to know the correct wheel nut torque, the proper way to mount tires, or the exact procedure for towing the loader, you get it here. No reprints, no scanned pages with missing text. Each page is a clean OEM PDF. For reference, a Manual Transmission might tolerate a generic guide, but the S150’s hydrostatic system does not.

Frequently Asked Questions

Does this manual cover the Bobcat S150 engine?

Yes, it includes engine lubrication, cooling, and fuel system sections with factory specs.

What torque values are listed in the manual?

The manual provides OEM torque specifications for all major components including wheel nuts, cylinder bolts, main relief valve, and hydraulic fittings. Page 3 references safety but torque values are in specific sections. For example, the wheel nut torque is in Tire Maintenance. The manual is 802 pages, so every fastener specification is factory-verified. Do not use aftermarket specs. The hydraulic system section alone has dozens of torque specs for fittings, valves, and cylinders. The final drive chaincase oil level check also has specific torque for the fill plug. If you need the exact number for the lift cylinder rod end pivot pin, it’s in the disassembly section. This level of detail is why you buy the factory manual.

Is this the actual factory manual or a reprint?

This is a genuine Bobcat Company service manual, dealer copy, printed in 2008. It includes the BICS system and remote start tool procedures. Not a reprint or scan.

How is the hydraulic system documented?

Full schematics, component removal, disassembly, and testing procedures.

That’s the difference between a working loader and a scrap heap. If you’re tearing into an S150, don’t trust a chiltons or a pirated PDF. Get the factory documentation that every Bobcat dealer uses. For related models, check the Bobcat S150 S160 2006 Service Manual for earlier serial number coverage, the Bobcat S150 S160 2006 Service Manual – Section: Engine for engine-specific procedures on the 2006 variant, or the Bobcat S150 S160 2008 Service Manual – Section: Engine Lubrication System if you need the lubrication section in isolation. Also, compare drivetrain basics with this Manual Transmission resource. Access the Factory Manual now.