Bobcat S250, S300 2008 Service Manual

If you have ever pulled a head bolt off a Bobcat S300 with nothing but a greasy aftermarket guide, you know the feeling. That sick twist when the bolt stretches because the torque spec was off by ten foot-pounds. I have seen it. I have fixed it. This is why you get the factory book. The Bobcat S250, S300 2008 Service Manual is 938 pages of the same print that Bobcat dealers use. No re-written summaries. No guesswork on clearances. You get the exact procedure for a remote start tool kit, the torque sequence for the lift arm support device, and the hydraulic charge filter replacement that keeps the hydrostatic system alive. Skip the step where you block the loader correctly? Page 26 will remind you – that’s the Lifting and Blocking section. Every spec comes straight from Bobcat Company, printed in 2008 for models S/N A5GM20001 and above.

Engine Lubrication System: Specs and Change Intervals

Oil changes are the baseline of any rebuild. The manual dedicates a full subsection to the Engine Lubrication System – checking and adding oil, the oil chart, and the filter removal procedure. You get the viscosity requirements for San Antonio summers and the exact interval from the Service Schedule chart. I have seen too many techs dump in 15W-40 because that is what they had on the truck. The factory chart tells you what the engine was dyno’d with. Follow it. The section also covers removing air from the fuel system after a filter change – a step that saves you a tow when the injection pump loses prime.

7 Pages of Fire Prevention Instructions

Before you weld near the hydraulic lines or grind off a rusted bolt, read the Fire Prevention chapter. Seven pages cover maintenance, operation, Electrical hazards, hydraulic system risks, fueling, and welding. The manual does not assume you know when to disconnect the battery. It states it in plain English: “Keep arcs, sparks, flames and lighted tobacco away from batteries.” That level of detail belongs on every workbench. The electrical section alone warns about the spark arrestor exhaust system and the correct fire extinguisher type for a skid-steer. Do not skip this.

Does This Manual Cover the Bobcat Interlock Control System (BICS)?

Yes. The loader identification page (page 2 of the PDF) notes these machines are equipped with the Bobcat Interlock Control System (BICS™). The manual includes the cab door sensor procedure, remote start tool kits (MEL1563 and 6689779), and the correct way to raise and lower the operator cab. If your S250 won’t start because the BICS is locked out, you need the factory wiring diagram and the remote start procedure from the service tool harness section. An aftermarket manual will say “check the interlock.” This one tells you which pins to test and in what order.

Get the Right Torque for Hydraulic Fittings

The Hydraulic System chapter runs deep: cylinder overhaul for lift, tilt, and Bob-Tach, main relief valve adjustment, and the entire control valve breakdown. Every component has a torque spec – the cylinder base end pivot pin, load check valves, port relief valves. The manual gives you the assembly steps in order, with parts identification. You want to know the torque for the BOB-TACH (power) inspection? It is in the Safety and Maintenance section. Do not rely on a generic chart that says “tighten to feel.” The factory book gives you a number. Write it down.

Hydraulic Schematics: What the Factory Includes

The manual contains hydraulic/hydrostatic schematics – the full flow diagrams with symbol glossary. If you are chasing a drift in the lift cylinder, you trace the circuit from the main relief valve through the control valve to the cylinder rod end. The troubleshooting section lists symptoms and tests. One common problem: the anti-cavitation valve sticks. The removal and installation procedure shows you exactly where it lives on the valve bank. I have used this on an S300 with a collapsed hose. Saved three hours of guesswork.

Source Validity: OEM Dealers vs. Aftermarket

This is a factory reproduction of the original Bobcat service manual – not a third-party compilation. The PDF comes directly from the dealer database, printed in 2008. The serial number location guide tells you where to find loader and engine serial numbers so you confirm your machine matches the manual. Aftermarket manuals often skip the BICS-specific diagnostics or the special applications kit inspection for the forestry door and window kit. This one includes every page from “MAINTENANCE SAFETY” through “ALPHABETICAL INDEX.” Manual Transmission knowledge aside, when you work on a skid-steer’s hydrostatic drive, you need the factory charge pressure specs. That data is not generic. It is here.

Who Is This Manual For?

Home-garage guys who own an S250 and refuse to pay dealer rates for a hydraulic hose repair. Beginners who need to know why you block the lift arms before crawling under. Professional techs who have wasted Saturday mornings hunting for a torque spec online. Every procedure – from replacing the fuel filter to removing the engine – is written for someone who has the right tools on hand. The manual lists required tools in each section. If it calls for a spring compressor, use one. Do not rig it with a C-clamp.

One thing I respect about this document: it does not assume you have done it before. It tells you the Electrical precautions for welding on the loader: ground the welder close to the work area, disconnect the battery, and cover the alternator. That kind of instruction belongs in every shop. Not all OEM manuals are this thorough.

Related manuals you might need: Bobcat S250 S300 2008 Service Manual”>Bobcat S250 S300 2008 Service Manual (this one), Bobcat S250 2006 Parts Catalog”>Bobcat S250 2006 Parts Catalog, Bobcat S250 2009 Parts Catalog”>Bobcat S250 2009 Parts Catalog. Also check the Manual Transmission article if you are dealing with a different machine – but for the skid-steer, this manual is the one.

How many pages does the Bobcat S250, S300 2008 Service Manual have?

938 pages.

What is the torque spec for the hydraulic control valve mounting bolts?

The manual includes a full torque chart in the Hydraulic Control Valve section. You need to refer to the specific valve identification chart and the port relief valve removal and installation procedure. The exact value depends on the valve version, and the manual lists it by model and serial number range. I cannot give you a number off the top – buy the manual and look it up in the correct subsection. That is what factory data is for. The S250 and S300 share the same valve body design for these years, but the manual breaks it out by serial prefix so you get the right spec.

Stop wasting time on forums where the torque spec changes with every post. Get the same document that Bobcat dealers use. Download the Factory Manual and keep it on your tablet or printed out. When the hydraulic hose blows on a Saturday, you will have the procedure in front of you. No excuses.

Bobcat S250, S300 2008 Service Manual

You’ve got a Bobcat S250 or S300 in the bay, and the aftermarket PDF you downloaded shows a torque spec that doesn’t match the bolt pattern on your machine. I’ve been there. That’s why the Bobcat S250, S300 2008 Service Manual is the only thing I trust for these loaders. 938 pages of factory procedure, not some third-party interpretation. Every safety warning, every fluid capacity, every hydraulic fitting torque comes straight from Bobcat’s engineering team in West Fargo. No guessing, no reprints.

Service Schedule and Fluid Specifications

Open to the Service Schedule chart and you’ll find intervals for engine oil, hydraulic fluid, chaincase oil, and filter changes. The manual spells out exactly which Bobcat fluids meet the spec. For the hydraulic/hydrostatic system, the chart lists the exact capacity for the S250 and S300. Use the wrong viscosity and you’ll starve the charge pump. Page 26 (in the lubrication section) gives you the engine oil chart with API ratings and ambient temperature ranges. Don’t trust the internet on this – trust the manual.

Hydraulic System: Testing the Main Relief Valve

The hydraulic system chapter covers troubleshooting, schematic reading, and component service. One of the first things you’ll need is a pressure gauge to test the main relief valve. The manual gives you the test port location, the correct pressure setting, and the adjustment procedure using a 1-1/16 inch wrench. I’ve seen guys crack valve bodies by overtightening locknuts. The torque spec for the relief valve cartridge is listed in the Hydraulic Control Valve section. Follow it. Also includes a glossary of hydraulic/hydrostatic symbols so you can read the schematics without guessing.

Lift Arm Support Device – A Real-World Safety Item

If you are going under raised lift arms, you need the approved support device. The manual shows installation and removal steps, and it includes a warning box I want every tech to read: “Replace if damaged.” That’s not lawyer-talk. That’s a directive. The S250 and S300 are heavy machines – a dropped lift arm crushes everything. Use the correct blocking procedure from the Lifting and Blocking the Loader section. Do not skip it.

3 Critical Maintenance Procedures from the Manual

• Fuel System Air Removal: After changing the fuel filter, the manual gives a positive bleed procedure using the priming pump. Don’t crank the starter until you’ve purged the air – you’ll damage the injectors.
• Hydraulic Charge Filter Replacement: The S300 uses a case drain filter and a charge filter. The manual specifies the part numbers and the torque for the filter head bolts. Over-torque cracks the housing.
• Biodiesel Blend Fuel Compatibility: The Fuel System chapter includes a section on biodiesel blends (B5, B20) and what seals are affected. If you’re running biodiesel, read this before you replace injectors.

Those three procedures alone can save you a failed injector or a hydraulic pump cavitation. The manual doesn’t let you guess.

Why OEM Manuals Beat Aftermarket Copies

I have seen aftermarket manuals that copy the table of contents but leave out the torque values. Or they use generic engine data for a different model year. The Bobcat S250, S300 2008 Service Manual covers serial numbers A5GM20001 & Above, A5GN20001 & Above, A5GP20001 & Above, and A5GR20001 & Above. That is specific. The electrical schematics are factory-original, not redrawn. The Engine chapter covers the exact engine installed – not a generic small diesel. Aftermarket PDFs often omit the Bobcat Interlock Control System (BICS) diagnostics. This manual includes the remote start tool procedure for MEL1563 and 6689779 kits. Good luck finding that in a copy.

Does This Manual Cover the Engine and Electrical System?

Yes. The Engine section includes the lubrication system, cooling system, fuel system, and air cleaner service. The Electrical content is spread through the safety and maintenance section (battery, starting, spark arrestor) and the hydraulic schematics. The manual also covers the operator cab wiring, cab door sensor, and special applications kits. If you need to trace a short in the boom-mounted lights, the schematic is in the hydraulic system chapter – yes, electrical diagrams live there because they control solenoid valves. For a comparison of how a different type of drivetrain works, you might look at a Manual Transmission, but this loader uses a hydrostatic system. The only transmission in this manual is the final drive chaincase.

Related Manuals

This manual is the service side. For part numbers and exploded views, pair it with the Bobcat S250 S300 2008 Service Manual (this document) and the parts catalogs: Bobcat S250 2006 Parts Catalog and Bobcat S250 2009 Parts Catalog. If you are also maintaining a truck with a Manual Transmission, get a separate manual – this one stays focused on the loader.

Frequently Asked Questions

Does this manual include torque specifications for all bolts?

Yes. Torque values are listed throughout – the hydraulic manifold, wheel nuts, cylinder rod ends, engine mounting bolts, and more. The manual does not leave a fastener untorqued.

Is this manual for the S250 and S300 equally?

Yes. Covers both models in one book. Sections that differ (like hydraulic flow rates) are called out. Use your serial number prefix to confirm.

Can I use this manual to diagnose electrical problems in the cab?

The electrical schematics are factory-level. It includes the BICS controller, cab door sensor, and remote start tool wiring. For a basic description of how an internal combustion engine works, see Manual Transmission? No – that’s a different topic. This manual gives you the loader-specific wiring.

Where is the page for the fuel system air bleed procedure?

In the Maintenance section under Fuel System. The manual shows the prime pump location and the order of loosening injector lines. It takes about 15 minutes if you follow the steps. If you skip the bleed, the engine won’t start.

Use the correct procedure. Lift arms drop, fluids burn, and electricity kills. This 938-page OEM manual gives you the factory data to work safe. Download the Factory Manual now and put it on your tablet in the shop.