Description

Bobcat S150 2008 Service Manual – Factory OEM Repair Guide

Look, I’ve seen more skid-steer loaders come through my shop with stripped bolts and blown seals from guys using aftermarket specs than I care to count. The Bobcat S150 2008 Service Manual is the only document that gives you the actual factory procedures Bobcat engineers wrote. This is the same binder the dealer techs use.

Factory documentation cuts through the crap. Every torque value, every clearance check, every bleeding procedure comes straight from the 2008 Bobcat engineering release. That 857-page binder covers the S150 from the engine serial number plate to the Bob-Tach attachment pins.

Bobcat laid out the manual with real-world service in mind. The hydraulic/hydrostatic schematics alone are worth the price if you’re chasing a drift in the lift cylinder or a weak tilt. Each cylinder has a testing, removal, and disassembly section with parts identification.

857 Pages of Factory Service Data

You get the full service schedule, air cleaner service, cooling system, fuel system including biodiesel blend specs, engine lubrication, and the complete hydraulic/hydrostatic system with fluid charts and filter replacement procedures. The final drive transmission (chaincase) oil check and replacement is laid out. Spark arrestor muffler cleaning, pivot pin inspection, loader storage — it’s all in there.

Unlike a Manual Transmission repair where you can drop the pan and see the gears, the hydrostatic system in this machine requires pressure testing. The manual walks through each test point and what the gauge should read.

Bobcat S150 2008 Service Manual: Engine and Hydraulic Coverage

Engine work requires factory torque data. The lubrication section gives you the oil capacity, filter part numbers, and the exact sequence for replacing the filter and refilling. Cooling system cleaning and coolant replacement intervals are listed. Fuel system bleeding after filter changes is described stepwise — skip this and you’ll be cranking forever.

For the hydraulic side, the manual dives into the main relief valve adjustment, hydraulic control valve service (standard valve), cylinder testing for both lift and tilt, and the Bob-Tach cylinder. If you need to pull the hydraulic charge filter or the case drain filters on a two-speed loader, the procedure is there.

Earlier model support is available through Bobcat S150 S160 2006 Service Manual and the Bobcat S150 S160 2006 Service Manual – Section: Engine but the 2008 edition includes the BICS (Bobcat Interlock Control System) updates that older manuals don’t cover.

LIFTING AND BLOCKING THE LOADER: Factory Procedure

Every safety procedure in this manual is written by the same people who designed the machine. The lift arm support device installation and removal steps are explicit. You don’t guess which pin goes where — the manual shows the approved support device and tells you to replace it if damaged. Never go under raised lift arms without that device. The operator cab raising and lowering procedure, including the cab door sensor, is spelled out.

The fire prevention section covers electrical, hydraulic system, fueling, starting, and welding/grinding precautions. Battery safety is included — lead-acid batteries produce explosive gases. The manual even tells you what type of eye protection to wear for different welding jobs.

Electrical System Diagnostics: Schematics and Troubleshooting

The Bobcat Interlock Control System (BICS) is fully documented. If you’re getting an error code or the machine won’t start, the remote start tool procedures (kits MEL1563 and 6689779) give you a workaround for diagnostics. The service tool harness descriptions — control harness MEL1565 and communicator harness MEL1566 — are listed with part numbers so you can source the correct test equipment.

Electrical troubleshooting includes checking the cab door sensor, understanding the BICS logic, and using the remote start procedure safely. Compared to working on a Manual Transmission where the electrical system is minimal, this machine has interlocks that can lock you out. The manual shows you how to bypass them for service without creating a safety hazard.

Oil changes on this loader are straightforward if you have the right filter — the Engine Lubrication System section in Bobcat S150 S160 2008 Service Manual – Section: Engine Lubrication System gives the exact intervals and part numbers.

Safety Procedures You Cannot Skip

The manual starts with a full safety chapter that includes fire prevention, serial number locations, delivery report procedures, and loader identification. Every step in the maintenance section tells you when the engine must be off and when it can run. Ventilation requirements for welding and grinding are stated — toxic dust from painted parts is a real hazard.

Hydraulic fluid under pressure can penetrate your skin. Diesel fuel under pressure can inject into your eyes. The manual warns about both repeatedly. Keep the rear door closed except for service. Replace the lift arm support device if damaged. These aren’t suggestions; they’re the same rules the factory safety engineers wrote.

Frequently Asked Questions

Is this manual the same as the one Bobcat dealers use?

Yes. It’s the dealer copy, not for resale.

Does the manual include torque specs for the wheel nuts?

Wheel nut torque is covered in the TIRE MAINTENANCE section. The manual lists the specific torque for the wheel nuts on the S150, along with rotation and mounting procedures. It also includes the correct procedure for retorquing after initial installation. This is not something you want to guess on — loose wheel nuts on a skid-steer can cause the wheel to separate at speed. The manual also covers the pivot pin inspection intervals, spark arrestor cleaning, and the full service schedule. If you’re doing any work that involves removing the wheels or drivetrain components, the torque table is referenced in multiple sections to ensure you don’t miss it.

Don’t trust a printout from a generic website for something that could put you in the hospital. If you own an S150, this is the only document you should have on the bench. Access the Factory Manual now.