A CT4055 compact tractor is the kind of machine that's mowing acreage one day and running a loader or auger the next. When something quits in the middle of a field or at a customer's place, this is the manual the tech or owner-operator reaches for. They're trying to find step-by-step repair info, wiring detail, and the right specs so they only tear it apart once and don't sit waiting on parts twice.
What this manual helps you do
- Diagnose electrical issues using wiring diagrams and step checks for the CT4055 in the B4V311001-B4V399999 serial range
- Trace and troubleshoot hydraulic and 3-point hitch problems, then verify pressures after repairs
- Follow teardown and reassembly procedures on the engine, front axle, transmission, and driveline components
- Check, adjust, and set linkages, clutches, brakes, and PTO so they work correctly under load
- Replace seals, pumps, valves, and other components with the right sequences and reference specs
Who this is for
This is for a small contractor, farmer, rental fleet, or shop mechanic working specifically on a Bobcat CT4055 within the B4V311001-B4V399999 serial range. If you only need basic operating tips, safety info, or maintenance intervals, you want the operator's handbook instead, not this service manual.
FAQ
Q: Is this a searchable PDF, and can I read the wiring diagrams on a laptop or tablet?
A: Yes, this type of manual is normally a searchable PDF, and the wiring diagrams are laid out so you can zoom in and read them clearly on-screen.
Q: How do I know if it fits my tractor's serial number?
A: If your CT4055 serial number falls between B4V311001 and B4V399999, this is the correct service manual for your machine.
Q: I'm just doing oil changes and filters, is this the right document?
A: Probably not. For basic maintenance only, the operator's handbook is usually enough. This service manual is aimed at full diagnostic and repair work.
Bottom line: If you have a Bobcat CT4055 in the B4V311001-B4V399999 range and you're doing real repair work, this is the right manual. If your serial number is outside that range, don't buy this one.
📘 Show Index
Table of Contents:
- FORWARD
- TABLE OF CONTENTS
- SAFETY FIRST
- FOR SAFETY
- SAFETY TIPS
- SAFETY GEAR
- WORK PLACE
- SAFETY INSTRUCTIONS WHEN PREPARING TRACTOR
- AVOID FIRES
- CAUTIONS WHEN HANDLING THE BATTERY
- CAUTIONS FOR HIGH PRESSURE HOSES
- USE OF APPROPRIATE TOOLS AND EQUIPMENT
- HANDLING OF HAZARDOUS MATERIALS
- HANDLING OF ROTATING BLADE, SHAFT AND DRIVING BELT
- PREVENTION OF SCALD
- DISPOSAL OF ENVIRONMENTAL WASTE
- CAUTIONS WHEN HANDLING TIRES
- SAFETY DECALS
- GENERAL
- DESCRIPTION FOR SYMBOLS AND ABBREVIATIONS
- TRACTOR EXTERIOR VIEW
- IDENTIFICATION NUMBER
- TRACTOR SERIAL NUMBER
- ENGINE SERIAL NUMBER
- TRANSMISSION SERIAL NUMBER
- DIMENSIONS
- SPECIFICATIONS
- DRIVING SPEED
- GEAR ARRANGEMENT
- ARRANGEMENT OF MAIN SHIFT GEAR AND REAR AXLE GEARS
- ROLLING CIRCUMFERENCE OF REAR WHEELS
- ROTATING SPEED RATIO (ENGINE VS. REAR AXLE)
- MAINTENANCE
- MAINTENANCE SCHEDULE CHART
- LUBRICATION LIST
- TIRE MAINTENANCE
- PROPER INFLATION PRESSURE
- WHEEL BOLT TORQUE
- TIGHTENING TORQUES
- GENERAL USE SCREWS, BOLTS AND NUTS
- STUD BOLTS
- AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF THREADS
- SPRING PIN AND SNAP RING INSTALLATION
- SPRING PIN TYPE
- SNAP RING INSTALLATION
- UNIT CONVERSION TABLE
- ENGINE
- ENGINE IDENTIFICATION
- ENGINE EPA DECAL (A)
- ENGINE NUMBER (B)
- ASSIGNMENT STANDARD FOR ENGINE MODEL CODE
- SPECIFICATIONS
- GENERAL SPECIFICATIONS
- ENGINE DIMENSION
- COMPONENTS
- TORQUE
- BRAKE HORSE POWER (HP)
- ENGINE PERFORMANCE CURVE ANALYSIS
- S.F.C (SPECIFIC FUEL CONSUMPTION) (FOR REFERENCE ONLY)
- ENGINE BODY
- SERVICING SPECIFICATIONS
- LUBRICATING SYSTEM
- COOLING SYSTEM
- TIGHTENING TORQUES FOR ENGINE
- OPERATING PRINCIPLE
- CRDI (COMMON RAIL DIRECT INJECTION) SYSTEM
- ECU
- HIGH PRESSURE FUEL PUMP (FOR INJECTION)
- FUEL RAIL(COMMON RAIL)
- INJECTOR [C3I]
- CYLINDER HEAD
- CYLINDER BLOCK
- CYLINDER HONING
- BODY AND POWER TRAIN SYSTEM
- CRANKSHAFT
- PISTON AND PISTON RING
- CONNECTING ROD
- CAMSHAFT
- ROCKER ARM ASSEMBLY
- INTAKE AND EXHAUST VALVES
- TIMING GEAR
- FLYWHEEL
- MLS CYLINDER HEAD GASKET
- ENGINE OIL FLOW
- LUBRICATING SYSTEM
- ENGINE OIL FLOW CHART
- FUNCTION OF LUBRICATING SYSTEM
- COOLANT FLOW ROUTE
- COOLING SYSTEM
- WATER PUMP
- THERMOSTAT
- RADIATOR
- RADIATOR CAP
- FUEL SYSTEM
- OVERVIEW FOR FUEL SUPPLY
- FUEL FLOW ROUTE
- FUEL FILTER
- BLEEDING THE FUEL SYSTEM
- HIGH PRESSURE FUEL PUMP
- COMMON RAIL (FUEL RAIL)
- INJECTOR [C3I (CALIBRATION IMPROVED INDIVIDUAL INJECTOR)]
- FUEL COOLER
- ACCELERATION SYSTEM
- INTAKE & EXHAUST SYSTEM
- EGR COOLER
- EGR VALVE
- AIR CONTROL VAVLE
- CCRT (CATALYZED CONTINUOUSLY REGENERATING TRAP)
- TURBO CHARGER
- SENSOR
- SENSORS AS Input / Output FOR ECU
- TROUBLESHOOTING
- MEASUREMENT AND ADJUSTMENT
- VALVE CLEARANCE
- VALVE LIFT (DEFLECTION AND WORN CONDITION OF VALVE CAM, TAPPET, PUSH ROD, ROCKER ARM, ETC.)
- OIL PRESSURE MEASUREMENT
- BUBBLE TEST FOR RADIATOR
- TURBO CHARGER WASTEGATE PRESSURE CHECK
- EXPLODED VIEW
- CYLINDER BLOCK
- OILPAN
- CYLINDER HEAD
- GEARCASE
- OIL FILTER
- CRANK SHAFT
- PISTON & CONNECTING ROD
- CAM SHAFT
- IDLE GEAR
- ROCKER ARM & VALVE
- FUEL EQUIPMENT
- WATER FLANGE
- WATER PUMP
- CYLINDER HEAD COVER
- FUEL FILTER & PIPE
- INLET MANIFOLD
- EGR
- COOLING FAN
- TURBOCHARGER
- TURBO PIPE
- AFTER TREATMENT
- DISASSEMBLY, SERVICE AND ASSEMBLY
- ENGINE REMOVAL
- ENGINE COMPONENT REMOVAL
- ENGINE DISASSEMBLY
- HEAD COVER
- GLOW PLUG AND INJECTOR
- ROCKER ARM ASSEMBLY
- CYLINDER HEAD
- INTAKE AND EXHAUST VALVES
- HIGH PRESSURE FUEL PUMP
- GEAR CASE
- GEARS IN GEAR CASE
- PISTON AND CONNECTING ROD
- FLYWHEEL AND CRANKSHAFT
- OIL FILTER
- OIL PUMP
- THERMOSTAT
- WATER PUMP
- FUEL FILTER
- TURBO CHARGER
- CLUTCH
- SPECIFICATIONS
- GENERAL SPECIFICATIONS
- TIGHTENING TORQUES
- SEALANT
- OPERATING PRINCIPLE
- TROUBLESHOOTING
- MEASUREMENT AND ADJUSTMENT
- SAFETY START SWITCH ADJUSTMENT
- CLUTCH DISC SPLINE BOSS AND GEAR SHAFT END PLAY
- CLUTCH DISC WEAR INSPECTION
- PRESSURE PLATE INSPECTION
- THRUST BALL BEARING INSPECTION
- FLYWHEEL SURFACE AND DEFLECTION OF ENGINE CRANKSHAFT
- CLUTCH LEVER GROUP
- EXPLODED VIEW
- CLUTCH LEVER GROUP
- CLUTCH PEDAL GROUP
- DISASSEMBLY, SERVICE AND ASSEMBLY
- CLUTCH DISASSEMBLY (CLUTCH DISC REPLACEMENT)
- CLUTCH COVER INSTALLATION
- TRANSMISSION
- SPECIFICATIONS
- GENERAL SPECIFICATIONS
- TIGHTENING TORQUE FOR MAJOR COMPONENTS
- SEALANT AND ADHESIVE SPECIFICATIONS
- STRUCTURE AND OPERATING PRINCIPLE
- OPERATING PRINCIPLE OF SYNCHRONIZER
- SHUTTLE
- PTO CLUTCH PACK
- CALCULATION FOR REAR PTO
- FRONT WHEEL DRIVE & QT
- INSPECTION AND ADJUSTMENT
- TROUBLESHOOTING
- EXPLODED VIEW
- COUNTER SHAFT
- MAIN SPEED FORK
- SHUTTLE SHAFT
- SHUTTLE FORK
- FRONT DRIVE SYSTEM
- PTO COUNTER SHAFT
- PTO CLUTCH
- PROPELLER SHAFT
- HYD CLUTCH
- DISASSEMBLY, SERVICE AND ASSEMBLY
- CLUTCH HOUSING REMOVAL
- MIDDLE CASE REMOVAL
- SHUTTLE SHAFT ASSEMBLY
- HYDRAULIC CLUTCH COMPONENTS DISASSEMBLY AND ASSEMBLY
- SYNCHRONIZER ASSEMBLY
- MIDDLE CASE SECTION (SHUTTLE SHIFT SECTION) ASSEMBLY
- TRANSMISSION CASE SECTION (RANGE SHIFT / 4WD SECTION) DISASSEMBLY AND ASSEMBLY
- SPIRAL BEVEL PINION SHAFT DISASSEMBLY
- SPIRAL BEVEL PINION SHAFT ASSEMBLY
- 18 GEAR SHAFT DISASSEMBLY
- PTO SHAFT DISASSEMBLY
- REAR AXLE
- SPECIFICATIONS
- TRANSMISSION FLUID
- TIGHTENING TORQUES
- OPERATING PRINCIPLE
- POWER TRAIN OF REAR AXLE
- PRINCIPLE OF DIFFERENTIAL SYSTEM
- DIFFERENTIAL LOCK SYSTEM
- TROUBLESHOOTING
- INSPECTION AND ADJUSTMENT
- BACKLASH FOR DIFFERENTIAL PINION AND SIDE GEAR
- PRELOAD OF TAPER ROLLER
BEARING IN DIFF.
- BACKLASH FOR SPIRAL BEVEL PINION AND RING GEAR
- TOOTH CONTACT OF SPIRAL BEVEL
- EXPLODED VIEW
- SPIRAL BEVEL GEAR
- REAR DIFFERENTIAL SYSTEM
- DIFF. LOCK FORK
- REAR AXLE
- DISASSEMBLY, SERVICING AND ASSEMBLY
- REAR AXLE COMPONENTS
- REAR DIFFERENTIAL DISASSEMBLY
- REAR DIFFERENTIAL SYSTEM
COMPONENTS DISASSEMBLY
- REAR DIFFERENTIAL SYSTEM ASSEMBLY
- REAR DIFFERENTIAL INSTALLATION
- BRAKE
- SPECIFICATIONS
- STRUCTURE AND OPERATING PRINCIPLE
- TROUBLESHOOTING
- INSPECTION AND ADJUSTMENT
- BRAKE PEDAL FREE PLAY
- CLEARANCE OF BRAKE LAMP SWITCH
- BRAKE COMPONENTS INSPECTION
- CAM PLATE
- CAM PLATE AND STEEL BALL
- EXPLODED VIEW
- REAR SHAFT CASE
- BRAKE PEDAL
- BRAKE ROD
- DISASSEMBLY, SERVICING AND ASSEMBLY
- BRAKE SECTION DISASSEMBLY AND ASSEMBLY
- FRONT AXLE
- SPECIFICATIONS
- GENERAL SPECIFICATIONS
- SEALANT AND ADHESIVE
- TIGHTENING TORQUE FOR MAJOR COMPONENTS
- STRUCTURE AND OPERATING PRINCIPLE
- POWER TRANSFER SYSTEM FOR FRONT AXLE
- DIFFERENTIAL SYSTEM
- LOAD TRANSFER
- FLOATING SEAL
- TROUBLESHOOTING
- INSPECTION AND ADJUSTMENT
- TOE-IN
- STEERING ANGLE
- SWAY RESISTANCE
- PRELOAD OF TAPER ROLLER BEARING ON SPIRAL BEVEL PINION SHAFT
- BACKLASH FOR DIFFERENTIAL PINION AND DIFFERENTIAL SIDE GEAR
- BACKLASH FOR SPIRAL BEVEL PINION AND 23 SPIRAL BEVEL GEAR
- TOOTH CONTACT OF SPIRAL BEVEL GEAR
- TOOTH CONTACT FOR UPPER BEVEL GEARS AND FINAL DRIVE BEVEL GEARS
- EXPLODED VIEW
- PROPELLER SHAFT
- FRONT AXLE BRACKET
- BEVEL PINION SHAFT
- FRONT DIFFERENTIAL
- BEVEL GEAR CASE
- BEVEL GEAR SHAFT
- FRONT AXLE CASE
- FRONT AXLE
- STEERING CYLINDER
- DISASSEMBLY, SERVICING AND ASSEMBLY
- FRONT AXLE OIL SEAL REPLACEMENT
- BEVEL GEAR CASE OIL SEAL REPLACEMENT
- FRONT AXLE CASE DISASSEMBLY AND ASSEMBLY
- FRONT DIFFERENTIAL SYSTEM REMOVAL AND INSTALLATION
- FRONT DIFFERENTIAL SYSTEM DISASSEMBLY AND ASSEMBLY COMPONENTS
- STEERING SYSTEM
- SPECIFICATIONS AND TIGHTENING TORQUE
- SPECIFICATIONS FOR STEERING SYSTEM
- TIGHTENING TORQUE FOR MAJOR COMPONENTS
- HYDRAULIC PUMP
- POWER STEERING UNIT
- STEERING CYLINDER
- STRUCTURE AND OPERATING PRINCIPLE
- OPERATING DIAGRAM
- STEERING UNIT
- OPERATING PRINCIPLE
- STRUCTURE AND SPECIFICATIONS
- OPERATING PRINCIPLE OF STEERING SYSTEM
- STRUCTURE AND OPERATING PRINCIPLE
- TROUBLESHOOTING
- INSPECTION AND ADJUSTMENT
- STEERING UNIT RELIEF VALVE PRESSURE CHECK
- FRONT AXLE TOE-IN ADJUSTMENT
- EXPLODED VIEW
- STEERING CYLINDER
- STEERING COLUMN
- STEERING HOSE
- POWER STEERING UNIT
- DISASSEMBLY, SERVICING AND ASSEMBLY
- STEERING UNIT REMOVAL
- STEERING UNIT (ORBITROL UNIT) COMPONENTS DISASSEMBLY
- STEERING UNIT COMPONENTS ASSEMBLY
- RELIEF VALVE DISASSEMBLY AND ASSEMBLY
- STEERING CYLINDER REMOVAL
- HYDRAULIC SYSTEM
- SPECIFICATIONS
- GENERAL SPECIFICATIONS
- TIGHTENING TORQUE
- STRUCTURE AND OPERATING PRINCIPLE
- COMPONENT ARRANGEMENT
- OPERATING PRINCIPLE
- OPERATING DIAGRAM
- IMPLEMENT SECTION
- MAIN SECTION
- COMPONENTS
- HYDRAULIC FILTER
- GEAR PUMP
- MODULATOR VALVE (PTO, 4WD)
- REMOTE HYDRAULIC VALVE
- LIFT CONTROL VALVE (PCV VALVE)
- HYDRAULIC BLOCK
- SHUTTLE VALVE (H-SHUTTLE TYPE MODEL)
- OIL COOLER [TH]
- HYDRAULIC LIFT CYLINDER
- TROUBLESHOOTING
- INSPECTION AND ADJUSTMENT
- INPUT PRESSURE INSPECTION OF MODULATOR VALVE
- STEERING UNIT RELIEF PRESSURE INSPECTION
- INSPECTION USING EXTERNAL HYDRAULIC VALVE COUPLER
- LEVER SETTING OF HYDRAULIC LIFT CYLINDER
- ADJUSTING THE POSITION CONTROL LEVER
- SETTING THE DRAFT
- ONE-TOUCH LIFTING LEVER ADJUSTMENT
- EXPLODED VIEW
- HYD.CYLINDER
- EXTERNAL HYDRAULIC
- MODULATE VALVE
- SUCTION LINE
- GEAR PUMP
- HYDRAULIC BLOCK
- OIL COOLER
- LIFT CONTROL VALVE
- POSITION CONTROL
- DRAFT CONTROL
- TOP LINK
- ONE TOUCH LINK
- DOWN SPEED CONTROL
- DISASSEMBLY, SERVICING AND ASSEMBLY
- GEAR PUMP REMOVAL AND REASSEMBLY
- DISASSEMBLY OF GEAR PUMP
- GEAR PUMP ASSEMBLY
COMPONENTS ASSEMBLY
- MODULATOR VALVE
- Modulator valve disassembly
- Modulator valve assembly
- SHUTTLE VALVE (FOR H-SHUTTLE MODEL)
- SHUTTLE VALVE DISASSEMBLY
- REMOTE HYDRAULIC VALVE (DOUBLE ACTING VALVE)
- AUX. HYDRAULIC (DOUBLE ACTING) VALVE ASSEMBLY COMPONENTS DISASSEMBLY
- AUX. HYDRAULIC VALVE ASSEMBLY
- HYDRAULIC CYLINDER
- HYDRAULIC CYLINDER ASSEMBLY DISASSEMBLY
- HYDRAULIC CYLINDER ASSEMBLY REASSEMBLY
- LIFT CONTROL VALVE
- FLOW CONTROL VALVE
- RELIEF VALVE
- HYDRAULIC BLOCK
- HYDRAULIC BLOCK ASSEMBLY COMPONENTS DISASSEMBLY
- HYDRAULIC / HYDROSTATIC SCHEMATICS
- ELECTRIC SYSTEM AND DIAGNOSIS
- SPECIFICATIONS
- WIRING IDENTIFICATION
- CROSS SECTIONAL AREA OF WIRING
- SYMBOLS FOR ELECTRIC COMPONENTS
- FUSE
- INSPECTION
- CAUSE FOR BLOWN FUSE
- ELECTRIC DEVICE DIAGNOSIS
- OPERATING PRINCIPLE
- WHEN IGNITION SWITCH IS TURNED TO "ACC" POSITION
- OPERATING PRINCIPLE OF PREHEAT
- WHEN IGNITION SWITCH IS TURNED TO "ST" POSITION
- CHARGE WARNING LAMP OPERATION
- ELECTRIC COMPONENTS
- IGNITION SWITCH
- SLOW-BLOW FUSE
- IGNITION SWITCH OPERATION
- START MOTOR
- ALTERNATOR
- COMBINATION SWITCH
- FLASHER UNIT
- TERMINAL IDENTIFICATION AND CIRCUIT
- FLASHER UNIT TEST
- GLOW RELAY
- FUSE & RELAY BOX
- GLOW PLUG
- MICRO 5P RELAY
- MICRO 4P RELAY
- COOLANT TEMPERATURE SENSOR
- ENGINE OIL PRESSURE SWITCH
- FUEL SENDER
- HAZARD WARNING LAMP SWITCH
- ECU
- SENSORS AND RELAYS
- CRANKSHAFT POSITION SENSOR
- FUEL RAIL PRESSURE SENSOR
- ACCELERATION (KNOCK) SENSORS
- HIGH-PRESSURE FUEL PUMP
TEMPERATURE SENSOR
- WATER-IN-FUEL SENSOR
- EXHAUST GAS TEMP. SENSOR
- CAMSHAFT WHEEL SENSOR
- EGR VALVE SENSOR
- MAF SENSOR
- INTAKE AIR PRESSURE SENSOR/TEMPERATURE SENSOR
- DPF DIFFERENTIAL PRESSURE SENSOR
- THROTTLE POSITION SENSOR (TPS)
- BRAKE SWITCH
- PARKING BRAKE MICRO SWITCH
- 4WD / QT SWITCH [EU]
- QUICK TURN ANGLE SWITCH [EU]
- SAFETY START SWITCH
- ONE SIDE BRAKE SWITCH
- SAFETY SWITCH
- NEUTRAL SWITCH
- PTO SAFETY SWITCH
- RANGE SHIFT SAFETY SWITCH
- PTO AUTO/MANUAL SWITCH
- PTO SWITCH
- SWITCHS
- CRUISE PTO SWITCH
- CRUISE CONTROL RES/SET SWITCH
- PREHEAT CONTROLLER [AU]
- SAFETY CONTROL UNIT [EU]
- INSTRUMENT PANEL
- SYMBOLS AND COMPONENTS
- CONNECTOR
- GAUGES AND INDICATORS
- LAMPS
- TURN SIGNAL LAMP
- REAR COMBINATION LAMP
- TROUBLESHOOTING
- WHEN THE SYSTEM IS NOT CHARGED
- WHEN THE SYSTEM IS NOT PREHEATED MANUALLY
- WHEN THE SYSTEM IS NOT PREHEATED AUTOMATICALLY
- WHEN THE PTO DOES NOT OPERATE
- WHEN THE 4WD CONTROL SYSTEM DOES NOT OPERATE
- WHEN THE QUICK TURN CONTROL SYSTEM DOES NOT OPERATE [EU]
- WHEN THE HEAD LAMP CANNOT BE OPERATED
- FUEL GAUGE OPERATION
- TEMPERATURE GAUGE OPERATION
- TACHOMETER OPERATION WITH THE ENGINE RUNNING
- HOUR METER OPERATION
- EXPLODED VIEW
- GLOW CONTROL
- ENGINE ELECTRIC 3
- FRONT WORKING LAMP
- LIGHT CONTROL
- WIRE MAIN HARNESS
- DISPLAY CONTROL
- PTO CONTROL
- THROTTLE CONTROL, PTO CRUISE SWITCH AND DPF SWITCH
- DIAGNOSIS
- DIAGNOSTIC PROGRAM
- DTC (DIAGNOSTIC TROUBLE CODE)
- COMPOSITION
- ERORR CODE & ACTION
- FAULT DIAGNOSIS CODE DESCRIPTION
- ELECTRICAL SCHEMATICS
- INDEX
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