The S100 is a small skid-steer loader that ends up on tight residential sites, small farms, and rental yards doing pallet work, grading, and light dirt work. People reach for this service manual when the machine is out of warranty and they need more than fluid changes and grease. In my shop, this is what I pull when an S100 has a drive issue, hydraulic leak, electrical problem, or needs a proper teardown and reassembly with the right specs.
What this manual helps you do
- Diagnose hydraulic and hydrostatic problems, then check pressures and flow in a logical order
- Trace electrical faults using wiring diagrams, then verify power, grounds, and signal paths
- Follow step-by-step removal and installation for pumps, drive motors, cylinders, and major components
- Rebuild and adjust mechanical systems like Bob-Tach, linkages, brakes, and chain cases after parts replacement
- Set, adjust, and verify engine-related items after repairs, including fuel, cooling, and control components
Who this is for
This is for anyone maintaining or repairing a Bobcat S100 loader with serial number A8ET20001 through A8ET99999: small contractors, owner-operators, rental fleets, and shop or field techs. If you just need basic controls, safety, or daily checks, you want the operator's handbook instead, not this manual.
FAQ
Q: Is this a searchable PDF and are the wiring diagrams readable?
A: These manuals are usually supplied as searchable PDFs, and the wiring diagrams are typically clear enough to zoom in and trace circuits on a laptop or tablet.
Q: How do I know if it covers my exact S100?
A: If your S100 serial number falls between A8ET20001 and A8ET99999, this is the correct service manual series for your machine.
Q: Is this the right manual if I'm only doing oil changes and filters?
A: It will work, but it's overkill. For simple maintenance, the operator's handbook is easier to follow and cheaper.
Bottom line: If your S100 serial is in that A8ET range and you're doing real repair work, this is the yes you're looking for.
📘 Show Index
Table of Contents:
- MAINTENANCE SAFETY
- CONTENTS
- FOREWORD
- FOREWORD
- SAFETY INSTRUCTIONS
- FIRE PREVENTION
- Maintenance
- Operation
- Electrical
- Hydraulic System
- Fueling
- Starting
- Spark Arrester Exhaust System
- Welding And Grinding
- Fire Extinguishers
- SERIAL NUMBER LOCATIONS
- Loader Serial Number
- Engine Serial Number
- DELIVERY REPORT
- LOADER IDENTIFICATION
- SAFETY AND MAINTENANCE
- LIFTING AND BLOCKING THE LOADER
- LIFT ARM SUPPORT DEVICE
- OPERATOR CAB
- Description
- Raising
- Lowering
- Cab Door Sensor
- Special Applications Kit
- Special Applications Kit Inspection And Maintenance
- TRANSPORTING THE LOADER ON A TRAILER
- Loading And Unloading
- Fastening
- TOWING THE LOADER
- REMOTE START TOOL KIT – MEL1563
- Remote Start Tool – MEL1563
- Service Tool Harness Control – MEL1565
- Service Tool Harness Communicator – MEL1566
- Remote Start Procedure
- REMOTE START TOOL (SERVICE TOOL) KIT – 7217666
- Description
- Remote Start Tool (Service Tool) – 7022042
- Loader Service Tool Harness – 6689747
- Computer Service Tool Harness – 6689746
- Remote Start Procedure
- SERVICE SCHEDULE
- AIR CLEANER SERVICE
- Replacing Filter Elements
- ENGINE COOLING SYSTEM
- Cleaning
- Checking Level
- Removing And Replacing Coolant
- FUEL SYSTEM
- Fuel Specifications
- Biodiesel Blend Fuel
- Filling The Fuel Tank
- Fuel Filter
- Removing Air From The Fuel System
- ENGINE LUBRICATION SYSTEM
- Checking And Adding Engine Oil
- Engine Oil Chart
- Removing And Replacing Oil And Filter
- HYDRAULIC / HYDROSTATIC SYSTEM
- Checking And Adding Fluid
- Hydraulic / Hydrostatic Fluid Chart
- Removing And Replacing Hydraulic Fluid
- Removing And Replacing Hydraulic / Hydrostatic Filter
- Removing And Replacing Case Drain Filters
- Removing And Replacing Hydraulic Charge Filter
- Breather Cap
- FINAL DRIVE TRANSMISSION (CHAINCASE)
- Checking And Adding Oil
- Removing And Replacing Oil
- BOB-TACH (HAND LEVER)
- Inspection And Maintenance
- BOB-TACH (POWER)
- Inspection And Maintenance
- LUBRICATING THE LOADER
- TIRE MAINTENANCE
- Wheel Nuts
- Rotating
- Mounting
- SPARK ARRESTER MUFFLER
- PIVOT PINS
- Inspection And Maintenance
- LOADER STORAGE AND RETURN TO SERVICE
- Storage
- Return To Service
- STOPPING THE ENGINE AND LEAVING THE LOADER
- EMERGENCY EXIT
- SEAT BELT
- Inspection And Maintenance
- HYDRAULIC SYSTEM
- HYDRAULIC / HYDROSTATIC SCHEMATICS
- HYDRAULIC SYSTEM INFORMATION
- Glossary Of Hydraulic / Hydrostatic Symbols
- Troubleshooting
- CYLINDER (LIFT)
- Testing
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- CYLINDER (TILT)
- Testing
- Removal And Installation
- Rod End Pivot Pin Bushing And Seal Removal And Installation
- Base End Pivot Pin Removal And Installation
- Parts Identification
- Disassembly And Assembly
- CYLINDER (BOB-TACH)
- Testing
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- MAIN RELIEF VALVE
- Description
- Testing
- Adjusting
- Removal And Installation
- MAIN RELIEF VALVE (SJC)
- Description
- Testing
- Adjusting
- Removal And Installation
- HYDRAULIC CONTROL VALVE
- Description
- Removal And Installation
- Identification Chart
- BICS™ Load Check Valve Removal And Installation
- Load Check Valve Removal And Installation (Tilt And Auxiliary)
- Anti-Cavitation Valve Removal And Installation (Lift, Rod End)
- Port Relief / Anti-Cavitation Valve Removal And Installation (Lift, Base End)
- Port Relief / Anti-Cavitation Valve Removal And Installation (Tilt, Base End)
- Port Relief / Anti-Cavitation Valve Removal And Installation (Tilt, Rod End)
- Port Relief / Anti-Cavitation Valve Removal And Installation
- Plug Removal And Installation
- Rubber Boot Removal And Installation
- End Cap / Spool Lock Block Removal And Installation
- Lift Spool And Detent Removal And Installation
- Tilt Spool Removal And Installation
- Auxiliary Spool Removal And Installation
- Solenoid Removal And Installation
- Lock Valve Removal And Installation
- Lift Arm Bypass Orifice Removal And Installation
- Main Relief Valve Removal And Installation
- HYDRAULIC CONTROL VALVE (SJC)
- Description
- Removal And Installation
- Actuator Removal And Installation
- Identification Chart
- BICS™ Load Check Valve Removal And Installation
- Load Check Valve Removal And Installation (Tilt And Auxiliary)
- Anti-Cavitation Valve Removal And Installation (Lift, Rod End)
- Port Relief / Anti-Cavitation Valve Removal And Installation (Lift, Base End)
- Port Relief / Anti-Cavitation Valve Removal And Installation (Tilt, Base End)
- Port Relief / Anti-Cavitation Valve Removal And Installation (Tilt, Rod End)
- Port Relief / Anti-Cavitation Valve Removal And Installation
- Plug Removal And Installation
- End Cap Block Removal And Installation
- Lift Spool And Detent Removal And Installation
- Tilt Spool Removal And Installation
- Auxiliary Spool Removal And Installation
- Auxiliary Solenoid Removal And Installation
- Solenoid Removal And Installation
- Lock Valve Removal And Installation
- Lift Arm Bypass Orifice Removal And Installation
- Main Relief Valve Removal And Installation
- Check Valve Removal And Installation
- LIFT ARM BYPASS CONTROL VALVE
- Description
- Testing
- Removal And Installation
- Disassembly And Assembly
- HYDRAULIC PUMP
- Description
- Pump Test At Quick Couplers
- Direct Pump Test (Standard Section)
- Direct Pump Test (Charge Section)
- Removal And Installation
- Hydraulic Pump Startup
- Parts Identification
- Disassembly And Assembly
- HYDRAULIC PUMP (SJC)
- Description
- Pump Test At Quick Couplers
- Direct Pump Test (Standard Section)
- Removal And Installation
- Hydraulic Pump Startup
- Parts Identification
- Disassembly And Assembly
- HYDRAULIC / HYDROSTATIC FILTERS
- Description
- Housing Removal And Installation
- Charge Filter Housing Removal And Installation
- HYDRAULIC FLUID RESERVOIR
- Description
- Removal And Installation
- Hydraulic Fluid Screen
- OIL COOLER
- Description
- Removal And Installation
- BUCKET POSITION VALVE
- Description
- Solenoid Removal And Installation
- Solenoid Testing
- Removal And Installation
- Disassembly And Assembly
- FRONT AUXILIARY HYDRAULIC COUPLER BLOCK
- Description
- Removal And Installation
- FRONT AUXILIARY HYDRAULIC COUPLER BLOCK (SJC)
- Description
- Removal And Installation
- Disassembly And Assembly (FFI/FI)
- Disassembly And Assembly (FFH/FH)
- AUXILIARY HYDRAULIC INTERLOCK VALVE
- Description
- Removal And Installation
- Disassembly And Assembly
- BOB-TACH (POWER) BLOCK
- Description
- Removal And Installation
- Disassembly And Assembly
- HYDROSTATIC SYSTEM
- HYDROSTATIC SYSTEM INFORMATION
- Description
- Troubleshooting
- HYDROSTATIC MOTOR
- Description
- Removing And Replacing Oil
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- CHARGE PRESSURE
- Description
- Testing
- Sender Removal And Installation
- Adjusting
- HYDROSTATIC PUMP
- Description
- Replenishing / High Pressure Relief Valve Removal And Installation
- Removal And Installation
- Hydrostatic Pump Startup
- Parts Identification
- Disassembly
- Assembly
- HYDROSTATIC PUMP (SJC)
- Description
- Hydraulic Controller Removal And Installation
- Removal And Installation
- Hydrostatic Pump Startup
- Parts Identification
- High Pressure Relief And Bypass Valve
- Charge Relief Valve
- Disassembly And Assembly
- Mechanical Neutral Adjustment
- Hydraulic Controller Neutral Adjustment
- DRIVE BELT
- Description
- Shield Removal And Installation
- Adjusting
- Belt Removal And Installation
- Tensioner Pulley Removal And Installation
- Tensioner Pulley Disassembly And Assembly
- CASE DRAIN FILTER
- Description
- Disassembly And Assembly
- DRIVE SYSTEM
- BRAKE
- Description
- Disc Removal And Installation
- DRIVE COMPONENTS
- Description
- Axle Seal Removal And Installation
- Axle, Sprocket And Bearings Removal And Installation
- Chain Removal And Installation
- CHAINCASE
- Description
- Front Cover Removal And Installation
- Center Cover Removal And Installation
- MAINFRAME
- SEAT BAR
- Description
- Removal And Installation
- Disassembly And Assembly
- Compression Spring Disassembly And Assembly
- OPERATOR CAB
- Gas Cylinder Removal And Installation
- Gas Cylinder Bracket Disassembly And Assembly
- Removal And Installation
- OPERATOR SEAT
- Removal And Installation
- Seat Belt Removal And Installation
- OPERATOR SEAT (SUSPENSION)
- Removal And Installation
- Slide Rail Removal And Installation
- Seat Belt Removal And Installation
- Lower Cushion Removal And Installation
- Back Cushion Removal And Installation
- Shock Removal And Installation
- 3-Point Seat Belt Removal And Installation
- BOB-TACH (HAND LEVER)
- Description
- Removal And Installation
- Lever And Wedge Disassembly And Assembly
- Bob-Tach Stops
- Pivot Pin Bushing And Seal Removal And Installation
- BOB-TACH (POWER)
- Description
- Removal And Installation
- Lever And Wedge Disassembly And Assembly
- Bob-Tach Stops
- Pivot Pin Bushing And Seal Removal And Installation
- LIFT ARMS
- REAR GRILLE
- REAR DOOR
- Removal And Installation
- Striker Removal And Installation
- Striker Disassembly And Assembly
- Striker (Adjusting)
- Latch Removal And Installation
- FUEL TANK
- Removal And Installation
- Fuel Level Sender Removal And Installation
- Fuel Fill Screen Removal And Installation
- Fuel Pickup Screen
- CONTROL PEDALS AND LINKAGES
- Description
- Pedal Removal And Installation
- Linkage Removal And Installation
- Pedal (Adjusting)
- CONTROL PANEL
- Description
- Removal And Installation
- Shaft Removal And Installation
- Shaft Disassembly And Assembly
- Shock Removal And Installation
- Linkage Removal And Installation
- Pintle Arm Removal And Installation
- Pintle Arm Disassembly And Assembly
- Linkage Neutral (Adjusting)
- Linkage Travel (Adjusting)
- CONTROL PANEL (SJC)
- Description
- Removal And Installation
- CONTROL HANDLE / LEVER
- Description
- Lever Removal And Installation
- Boot Removal And Installation
- CONTROL HANDLE / LEVER (SJC)
- Description
- Joystick Testing
- Joystick Removal And Installation
- Joystick Mount Removal And Installation
- WINDOW (REAR)
- Removal
- Installation (Split Molding)
- Installation (Continuous Molding)
- WINDOW (TOP)
- WINDOW (SIDE)
- WINDOW (CAB DOOR)
- Removal (Standard Window)
- Installation (Standard Window)
- Removal And Installation (Special Applications Window)
- CAB DOOR
- Description
- Removal And Installation
- Aligning
- Adjusting
- Checking Operation
- CAB DOOR (SPECIAL APPLICATIONS KIT DOOR)
- Description
- Removal And Installation
- Aligning
- Adjusting
- Checking Operation
- ELECTRICAL SYSTEM AND ANALYSIS
- ELECTRICAL SCHEMATICS
- ELECTRICAL SYSTEM INFORMATION
- Glossary Of Electrical Symbols
- Standard Cab Harness Connectors
- Deluxe Cab Harness Connectors
- Mainframe Harness Connectors
- Description
- Troubleshooting
- Fuse And Relay Location / Identification
- Solenoid Testing
- BATTERY
- Removal And Installation
- Servicing
- Using A Booster Battery (Jump Starting)
- ALTERNATOR
- Belt Adjustment
- Belt Replacement
- Charging System Inspection
- Alternator Voltage Testing
- Low Voltage Testing
- High Voltage Testing
- Removal And Installation
- Parts Identification
- STARTER
- Testing
- Removal And Installation
- Parts Identification
- INSTRUMENT PANELS
- Left Panel
- Standard Key Panel
- Keyless Start Panel
- Deluxe Instrumentation Panel
- Side Panel
- Front Panel
- Front Panel Removal And Installation
- Removal And Installation (Left And Right)
- Key Switch Removal And Installation
- Alarm Removal And Installation
- LIGHTS
- Front Removal And Installation
- Rear Removal And Installation
- Cab Light Removal And Installation (Earlier Models)
- Cab Light Removal And Installation (Later Models)
- BOBCAT CONTROLLER (GATEWAY)
- Description
- Connector Identification
- Removal And Installation
- BOBCAT CONTROLLER (AUXILIARY) (SJC)
- Description
- Connector Identification
- Removal And Installation
- BOBCAT CONTROLLER (ACS) (SJC)
- Description
- Connector And Wire Identification
- Removal And Installation
- BOBCAT CONTROLLER (DRIVE) (SJC)
- Description
- Connector Identification
- Removal And Installation
- DIAGNOSTIC SERVICE CODES
- Viewing Service Codes
- Service Codes List
- BOBCAT INTERLOCK CONTROL SYSTEM (BICS™)
- Description
- Inspecting The BICS™ (Engine STOPPED – Key ON)
- Inspecting Deactivation Of The Auxiliary Hydraulics System (Engine STOPPED – Key ON)
- Inspecting The Seat Bar Sensor (Engine RUNNING)
- Inspecting The Traction Lock And Parking Brake (Engine RUNNING)
- Inspecting The Lift Arm Bypass Control
- Inspecting Deactivation Of Lift And Tilt Functions (SJC)
- Troubleshooting
- SEAT BAR SENSOR
- Description
- Troubleshooting
- Testing
- Removal And Installation
- Bobcat Interlock Control System (BICS™) Circuit Test
- TRACTION LOCK
- Description
- Troubleshooting
- Removal And Installation
- Inspecting
- ELECTRICAL / HYDRAULIC CONTROLS (SJC)
- SERVICE PC (LAPTOP COMPUTER)
- Connecting Remote Start Tool
- Connecting Remote Start Tool (Service Tool)
- CALIBRATION
- Description
- Actuator Testing
- Lift And Tilt Calibration (SJC)
- Hydrostatic Pump Calibration (SJC)
- STEERING DRIFT COMPENSATION
- FLYWHEEL RPM SENSOR
- CONTROL PANEL SETUP
- Right Panel Setup (Deluxe Instrumentation Panel)
- Attachment Control Information (Deluxe Instrumentation Panel)
- PASSWORD SETUP (DELUXE INSTRUMENTATION PANEL)
- Password Description
- Changing The Owner Password
- Changing The User Passwords
- Password Lockout Feature
- PASSWORD SETUP (KEYLESS START PANEL)
- Password Description
- Changing The Owner Password
- Password Lockout Feature
- MAINTENANCE CLOCK
- BACK-UP ALARM SYSTEM
- Description
- Inspecting
- Adjusting Switch Position
- Troubleshooting (Standard)
- Troubleshooting (Joystick)
- Alarm Removal And Installation
- Switch Removal And Installation
- ENGINE SERVICE
- ENGINE INFORMATION (S/N A8ET20001 & ABOVE)
- Description
- Specifications
- Torque Values
- Troubleshooting
- Engine Removal And Installation
- Engine Mount Replacement
- Compression – Testing
- ENGINE INFORMATION (S/N B4KH11001 & ABOVE)
- Description
- Torque Values
- Troubleshooting
- Engine Removal And Installation
- Engine Mount Replacement
- Compression – Testing
- ENGINE SPEED CONTROL
- ENGINE SPEED CONTROL (SJC)
- Removal And Installation
- Disassembly And Assembly
- MUFFLER
- AIR CLEANER
- Housing Removal And Installation
- ENGINE COOLING SYSTEM
- Radiator Removal And Installation
- Fan Removal And Installation
- Water Pump Removal And Installation
- Water Pump Disassembly And Assembly
- Thermostat Housing Removal And Installation
- Thermostat – Inspecting
- LUBRICATION SYSTEM
- Oil Pan Removal And Installation
- Oil Pump Removal And Installation
- Oil Pump Inspection
- Engine Oil Pressure – Testing
- FUEL SYSTEM
- Fuel Shutoff Solenoid – Checking
- Fuel Shutoff Solenoid Removal And Installation
- Fuel Injection Pump – Checking
- Fuel Injection Pump Removal And Installation
- Governor Disassembly And Assembly
- Fuel Camshaft Removal And Installation
- Fuel Injection Pump – Timing
- Fuel Injector Removal And Installation
- Fuel Injector Nozzle Pressure – Checking
- Nozzle Spray Condition
- Valve Seat Tightness
- CYLINDER HEAD
- Glow Plug – Testing
- Glow Plug Removal And Installation
- Valve Clearance Adjustment
- Valve Timing – Checking
- Cylinder Head Removal And Installation
- Cylinder Head Disassembly And Assembly
- Cylinder Head – Servicing
- Cylinder Head Top Clearance
- Valve Guide – Checking
- Reconditioning The Valve And Valve Seat
- Valve Spring
- Valve Tappets
- Rocker Arm And Shaft – Checking
- Push Rod Alignment – Checking
- CRANKSHAFT AND PISTONS
- Piston And Connecting Rod Removal And Installation
- Piston And Connecting Rod – Servicing
- Cylinder Bore – Checking
- Connecting Rod Alignment
- Crankshaft And Bearings Removal And Installation
- Crankshaft And Bearings – Servicing
- CAMSHAFT AND TIMING GEARS
- Timing Gearcase Cover Removal And Installation
- Timing Gears Backlash – Checking
- Idler Gear And Shaft Removal And Installation
- Camshaft – Servicing
- Idler Gear And Shaft Servicing
- FLYWHEEL AND HOUSING
- Flywheel Removal And Installation
- Ring Gear Removal And Installation
- Housing Removal And Installation
- HEATER
- HEATER SYSTEM
- REGULAR MAINTENANCE
- TROUBLESHOOTING
- Blower Motor Does Not Operate
- Blower Motor Operators Normally, But Air Flow Is Insufficient
- Electrical System
- Engine Coolant Bypassing The Heater Valve
- Heater Valve Not Opening Or Closing
- HEATER UNIT
- HEATER COIL
- BLOWER FAN
- Removal And Installation
- Disassembly And Assembly
- Connector Identification
- HEATER VALVE
- Removal And Installation
- Disassembly And Assembly
- SPECIFICATIONS
- (S100) LOADER SPECIFICATIONS
- Machine Dimensions
- Performance
- Engine
- Engine E4B
- Drive System
- Controls
- Hydraulic System
- Electrical
- Capacities
- Tires
- TECHNICAL SERVICE GUIDE SPECIFICATIONS
- Engine
- Engine Torques
- Cooling System
- Loader Torques
- Hydraulic / Hydrostatic System
- Fuel Consumption
- TORQUE SPECIFICATIONS FOR BOLTS
- Torque For General SAE Bolts
- Torque For General Metric Bolts
- HYDRAULIC CONNECTION SPECIFICATIONS
- O-ring Face Seal Connection
- Straight Thread O-ring Fitting
- Tubelines And Hoses
- Flare Fitting
- Port Seal Fitting
- HYDRAULIC / HYDROSTATIC FLUID SPECIFICATIONS
- CONVERSIONS
- Decimal And Millimeter Equivalent Chart
- U.S. To Metric Conversion Chart
- SERVICE TOOLS REQUIRED
- Remote Start Tools
- Hydraulic Tools
- Mainframe And Drive Tools
- Electrical Tools
- Engine Tools
- HVAC Tools
- ALPHABETICAL INDEX
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