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Bobcat B780 Backhoe Loader Service Manual (SN B4U311001-B4U399999)

Format: PDF (Printable Document)

File Language: English

File Pages: 828

File Size: 24.82 MB (Speed Download Link)

Brand: Bobcat

Model: B780 Backhoe Loader

Book No: 7363907

Serial No: SN B4U311001-B4U399999

Type of Document: Service Manual

Categories: ,

$ 45

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Bobcat B780 Backhoe Loader Service Manual (SN B4U311001-B4U399999)

The Bobcat B780 backhoe loader is a combo machine that digs, loads, and road-travels between jobs, so when it's down, your whole schedule slips. People reach for this service manual when they're past warranty and need real repair info, not sales fluff. Around my shop, that means chasing hydraulic faults, wiring issues, and keeping engines and drivetrains alive through 50/250/500-hour cycles.

What this manual helps you do

  • Diagnose hydraulic problems on the loader and backhoe, then check pressures and isolate bad valves, hoses, or cylinders
  • Trace and troubleshoot electrical faults using wiring diagrams so you can sort no-start, light, or sensor issues
  • Follow step-by-step teardown and reassembly for major components like axles, transmission, and hydraulic pumps
  • Adjust and verify linkages, brakes, steering, and loader/backhoe controls after repairs or component swaps
  • Replace and set up wear parts correctly so pins, bushings, seals, and bearings last between planned service intervals

Who this is for

This manual is for anyone maintaining or repairing a Bobcat B780 in the serial range B4U311001 to B4U399999: small contractors, owner-operators, rental fleets, and shop or field techs. If you only need how to run the machine 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: Yes, these are normally text-searchable PDFs and the wiring diagrams are laid out so you can zoom in and follow circuits clearly.

Q: How do I know if it matches my machine?

A: Check your B780 serial number plate. If it falls between B4U311001 and B4U399999, this is the correct manual.

Q: Is this the right thing for routine greasing and basic use?

A: No, this is a workshop repair manual. For basic operation and daily service, you need the operator's manual.

Bottom line: If your B780's serial number is in that B4U311001-B4U399999 range and you're doing real repair work, this is the right manual. If you just need operating tips, skip it.

📘 Show Index

Table of Contents:

  • MAINTENANCE SAFETY
  • CONTENTS
  • GENERAL INFORMATION
    • MACHINE INFORMATION
    • TECHNICAL PROPERTIES
      • Engine
      • Electrical System
      • Hydraulic System
      • Transmission
      • Axles / Brakes
      • Tires
      • Loader
      • Backhoe
      • Cab / Canopy
      • Steering
      • Capacities
      • Weights
    • MACHINE COMPONENTS
      • Standard
      • Optional
      • Optional Attachments
    • POSITION OF MACHINE
      • Loader Attachment Position
      • Backhoe Attachment Position
    • SAFETY INSTRUCTIONS
      • General Safety Information
      • Crushing And Burning Prevention
      • Fire And Explosion Prevention
      • Hydraulic Lines And Hoses
    • STORAGE
      • Preparing The Machine For Storage
      • Preparing The Machine For Work After A Long Period Of Storage
  • LUBRICATION AND MAINTENANCE
    • LIFTING AND BLOCKING THE BACKHOE LOADER
      • Procedure
    • APPROVED LIFT ARM SUPPORT DEVICE
      • Description
      • Installing The Approved Lift Arm Support Device
      • Placing The Approved Lift Arm Support Device In The Storage Position
    • TOWING THE BACKHOE LOADER
      • Procedure
    • AXLE TOE-IN ADJUSTMENT
      • Procedure
    • LUBRICATION
      • General Safety Information
      • Fluids, Lubricants And Fuel
      • Lubricant And Operating Materials Specifications
      • Lubrication Chart
      • Diesel Engine
      • Checking The Engine Oil Level
      • Draining The Engine Oil
      • Replacing The Engine Oil Filter Element
      • Adding The Engine Oil
      • Cooling System
      • Checking The Coolant Level
      • Changing The Coolant
      • Draining The Coolant
      • Cleaning The Radiator And Adding Coolant
      • Cleaning The Oil Cooler And The Radiator
      • Hydraulic System
      • Checking The Hydraulic Oil Level
      • Draining The Hydraulic Oil
      • Replacing The Return Filter
      • Replacing The Hydraulic Filter
      • Cleaning The Suction Strainer
      • Adding Hydraulic Oil
      • Fuel System
      • Fuel Specifications
      • Biodiesel Blend Fuel
      • Draining The Contaminant From The Fuel Filter
      • Draining The Contaminant From The Fuel Tank
      • Replacing The Fuel Filter Elements
      • Draining Fuel
      • Adding Fuel
      • Transmission System
      • Checking The Transmission Oil Level
      • Draining Transmission Oil
      • Replacing The Transmission Filter Elements
      • Adding Transmission Oil
      • Front Drive Axle And Reduction Gears
      • Front Drive Axle
      • Checking The Front Drive Axle Oil Level
      • Draining Oil
      • Adding Oil
      • Reduction Gears
      • Checking The Reduction Gear Oil Level
      • Draining The Reduction Gear Oil
      • Adding The Reduction Gear Oil
      • Rear Axle
      • Checking The Rear Axle Oil Level
      • Cleaning The Rear Axle Breather
      • Draining Rear Axle Oil
      • Adding Rear Axle Oil
      • Bleeding The Brake System
      • Service Schedule
    • AIR CLEANER SERVICE
      • Engine Air Intake System
      • Cleaning The Primary Element
      • Replacing The Air Filter Elements
      • Cab Air Intake Filter
    • BACKHOE BOOM / SWING LOCK
      • Engaging And Disengaging
    • ENGINE ALTERNATOR / FAN BELTS AND AIR CONDITIONER BELT (IF EQUIPPED)
      • Inspection
      • Replacing The Alternator / Fan Belts
      • Replacing The Air Conditioner Belt
    • TIRE MAINTENANCE
      • Description
      • Inspection
      • Wheel Nuts
      • Wheel Replacement
    • LUBRICATING THE BACKHOE LOADER
      • Lubrication Locations
  • HYDRAULIC SYSTEM
    • HYDRAULICE SCHEMATICS
    • HYDRAULIC SYSTEM INFORMATION
      • Glossary Of Hydraulic / Hydrostatic Symbols
    • HYDRAULIC SYSTEM
      • Tests And Hydraulic Pressure Test
      • Test Ports
      • Hydraulic Tank And Return Filter
      • Fixed Displacement Tandem Pump
      • Blocks
      • ON-OFF Solenoid Valve
      • ON-OFF Pressure Reducing Valve
      • Loader Control Valve
      • Unloading Valve Test
      • Steering Priority Valve
      • Backhoe Control Valve
      • Steering Pressure Test
      • Pilot Pressure Test
      • Pilot Pressure Regulation Block
      • Priority Valve
    • RETURN LINE CHECK VALVE
      • Removal And Installation
    • LOADER ARM LIFT CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • LOADER BUCKET (TILT) CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • CLAMPSHELL CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • BACKHOE BOOM CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • BACKHOE ARM CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • BACKHOE BUCKET CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • BACKHOE EXTENDABLE ARM CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • BACKHOE SWING CYLINDERS
      • Removal And Installation
      • Disassembly And Assembly
    • BACKHOE STABILIZER CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • CLAMP CYLINDERS
      • Removal And Installation
      • Disassembly And Assembly
    • HYDRAULIC PUMP
      • Removal And Installation
    • BACKHOE CONTROL VALVE
      • Removal And Installation
    • BRAKE PEDAL AND BOOSTER
      • Removal And Installation
    • HYDRAULIC FLUID RESERVOIR
      • Removal And Installation
      • Hydraulic Fluid Screen Removal And Installation
      • Hydraulic Filter Removal And Installation
      • Hydraulic Suction Strainer Removal And Installation
    • LOADER CONTROL VALVE
      • Removal And Installation
    • STEERING COLUMN AND UNIT
      • Removal And Installation
  • ELECTRICAL SYSTEM
    • ELECTRICAL SCHEMATICS
    • ELECTRICAL SYSTEM INFORMATION
      • Component Location
    • BATTERY
      • Removal And Installation
      • Inspection And Maintenance
    • FUSES
      • Component Location
      • Parts Identification
      • Removal And Installation
    • RELAYS
      • Component Location
      • Parts Identification
      • Removal And Installation
    • RIGHT CONTROL PANEL
      • Removal And Installation
    • STARTER
      • Removal And Installation
    • ALTERNATOR
      • Removal And Installation
  • AXLES
    • SAFTEY INSTRUCTIONS
      • General Safety Recommendations
    • FRONT AXLE
      • Description
      • Removal And Installation
      • Tightening Torques
      • Steering Cylinder Group Disassembly
      • Steering Cylinder Group Assembly
      • Epicyclic Reduction Gear Group Disassembly
      • Epicyclic Reduction Gear Group Assembly
      • Wheel Hub Group Disassembly
      • Wheel Hub Group Assembly
      • Axle Beam Group Disassembly
      • Axle Beam Group Assembly
      • Flange Group Disassembly
      • Flange Group Assembly
      • Differential Support Group Disassembly
      • Differential Support Group Assembly
      • Differential Group Disassembly
      • Differential Group Assembly
      • Pinion Group Disassembly
      • Pinion Group Assembly
      • Toe-in / Steering Angle
      • Steering Angle Adjustment
      • Testing After Assembly
    • FRONT SHAFT
      • Removal And Installation
    • REAR SHAFT
      • Removal And Installation
    • REAR AXLE
      • Description
      • Removal And Installation
      • Tightening Torques
      • Steering Cylinder Group Disassembly
      • Steering Cylinder Group Assembly
      • Epicyclic Reduction Gear Group Disassembly
      • Epicyclic Reduction Gear Group Assembly
      • Wheel Hub Group Disassembly
      • Wheel Hub Group Assembly
      • Parking Brake Group Disassembly
      • Parking Brake Group Assembly
      • Parking Brake Caliper
      • Axle Beam Trumpet Group Disassembly
      • Axle Beam Trumpet Group Assembly
      • Brake Group
      • Brake Group Disassembly
      • Brake Group Assembly
      • Differential Support Group Disassembly
      • Differential Support Group Assembly
      • Differential Group Disassembly
      • Differential Group Assembly
      • Differential Lock
      • Differential Locking Group Disassembly
      • Differential Locking Group Assembly
      • Pinion Group Disassembly
      • Pinion Group Assembly
      • Toe-In / Steering Angle
      • Steering Angle Adjustment
      • Testing After Assembly
    • SERVICE BRAKE
      • Description
      • Bleeding The Brake Circuitry
      • Test Procedure
      • Brake System Troubleshooting
  • TRANSMISSION
    • MANUAL USE
      • Maintenance
      • Repair
      • Agreements And Definitions
      • Typographic Agreements
      • Measurements
      • General Description
      • Recommendations For Repair Operations
      • Transmission Installation On The Machine
    • SAFETY INSTRUCTIONS
      • General Safety Recommendations
    • TRANSMISSION
      • Component Location
      • Tightening Torques
      • Hydraulic Schematic
      • Main Hydraulic Components
      • Kinematic Scheme
      • Plugs And Filters Disassembly
      • Removal And Installation
      • Plugs And Filters Disassembly
      • Plugs And Filters Assembly
      • Torque Converter And Oil Pump Disassembly
      • Torque Converter And Oil Pump Assembly
      • Hydraulic Control Valve Disassembly
      • Hydraulic Control Valve Assembly
      • Hydraulic System Pipes Disassembly
      • Hydraulic System Pipes Assembly
      • Transmission Housing Disassembly
      • Transmission Housing Assembly
      • Shafts A – D Disassembly
      • Shafts A – D Assembly
      • Axis B Disassembly
      • Axis B Assembly
      • Axis C Disassembly
      • Axis C Assembly
      • Axis E Disassembly
      • Axis E Assembly
  • ENGINE SERVICE
    • GENERAL ENGINE INFORMATION
      • Introduction
      • Engine Views
      • Engine Identification
      • Safety Precautions
      • Engine Lift Equipment
      • Viton Seals
      • Safety Cautions When an Engine in Cleaned
      • POWERPART Recommended Consumable Products
      • Troubleshooting
    • ENGINE SPECIFICATIONS
      • Basic Engine Data
      • Data And Dimensions
      • Thread Sealant
      • Standard Torque Values
      • Specific Torque Values
      • Compression Test Data
    • CYLINDER HEAD
      • General Description
      • Atomiser Cover
      • Rocker Cover
      • Rocker Arm
      • Valve Tip Clearances
      • Valve Springs
      • Removal
      • Installation
      • Valve And Valve Springs
      • Valve Guides
      • Inspection And To Correct
    • PISTON AND CONNECTING ROD ASSEMBLIES
      • General Description
      • Big End Bearing
      • Piston And Connecting Rod
      • Piston Rings
      • Piston And Connecting Rod Assembly
      • Piston And Piston Rings
      • Connecting Rod
      • Partially Finished Small End Bush
      • Piston Cooling Jets
    • CRANKSHAFT ASSEMBLY
      • General Description
      • Crankshaft Pulley
      • Rear End Oil Seal Assembly
      • To Remove And To Fit A Wear Sleeve
      • Thrust Washers
      • Main Bearings
      • Crankshaft
      • Balancer Unit
    • TIMING CASE AND DRIVE ASSEMBLY
      • General Description
      • Timing Cover
      • Mechanical Fuel Pump Gear
      • Electronic Fuel Pump Gear
      • Idler Gear and Hub
      • Heavy Duty Idler Gear
      • Camshaft Gear
      • Front Oil Seal
      • Timing Case
      • Crankshaft Gear
      • Camshaft and Tappets
    • CYLINDER BLOCK ASSEMBLY
      • General Description
      • Cylinder Block
      • Cylinder Bore
    • ENGINE TIMING
      • General Description
      • To Set Number 1 Piston To TDC On The Compression Stroke
      • To Check The Timing Of The Bosch VP30 Fuel Injection Pump
      • To Check The Timing Of The Bosch EPVE Fuel Injection Pump
      • To Adjust The Timing Of The Bosch EPVE Fuel Injection Pump
      • To Check The Timing Of The Delphi DP210 Fuel Injection Pump
      • To Check The Valve Timing
    • ASPERATION SYSTEM
      • General Description
      • Exhaust Elbow
      • Turbocharger Side Mount
      • Turbocharger Faults
      • Open Engine Breather
      • Natural Aspirated Engine Breather
      • Closed Engine Breather
    • LUBRICATION SYSTEM
      • General Description
      • Lubrication System Flow Diagram
      • Canister Type Oil Filter
      • Element Type Oil Filter
      • Filter Head
      • Sump
      • Dipstick Tube
      • Oil Strainer And Suction Pipe
      • Lubricating Oil Pump Assembly
      • Relief Valve
    • FUEL SYSTEM
      • General Description
      • Cold Start Advance Unit (KSB)
      • Typical Fuel System
      • Fuel Filter Assembly
      • Atomizers
      • Fuel Lift Pump And Filter Assembly
      • Removing Air From The Fuel System
      • Bosch VP30 Fuel Injection Pump
      • Bosch EVPE Fuel Injection Pump
      • Delphi DP210 Fuel Injection Pump
    • COOLING SYSTEM
      • General Description
      • Coolant Flow Diagram
      • Thermostat
      • Coolant Pump
      • Fan
      • Fan Drive
      • Lubricating Oil Cooler
      • Coolant Bypass Pipe
      • Oil Cooler / Radiator Removal And Installation
    • FLYWHEEL AND HOUSING
      • General Description
      • Flywheel
      • Ring Gear
      • Flywheel Housing
    • ELECTRICAL SYSTEM
      • General Description
      • Alternator
      • Starting Aid (Glow Plug)
      • Electrical Components
      • Engine Control Module (ECM)
      • Voltage Load Protection Module
      • Programming A New ECM
      • Speed And Timing Sensor
      • Pressure Sensor
      • Temperature Sensor
      • Wiring Harness
    • AUXILIARY EQUIPMENT
      • Power Steering Pump
      • Adaptor For A Hydraulic Pump Or A Steering Pump
      • Exhauster
    • SPECIAL TOOLS
    • REAR HAND THROTTLE LEVER
      • Cable Adjustment Procedure
    • ACCELERATOR PEDAL
      • Removal And Installation
      • Cable Adjustment Procedure
    • EXHAUST
      • Removal And Installation
    • AIR FILTER
      • Housing Removal And Installation
    • ENGINE
      • Removal And Installation
  • HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
    • HVAC UNIT
      • Parts Identification
      • Compressor Removal And Installation
      • Receiver Removal And Installation
      • Condenser Removal And Installation
      • Evaporator-heater Unit Removal And Installation
      • Evaporator-heater Unit Disassembly And Assembly
  • MAIN FRAME
    • BACKHOE BOOM / SWING LOCK
      • Removal And Installation
    • BACKHOE BUCKET
      • Removal And Installation
      • Teeth Removal And Installation
    • LOADER BUCKET
      • Removal And Installation
      • Teeth Removal And Installation
    • BACKHOE BOOM
      • Removal And Installation
    • CAB
      • Removal And Installation
    • COUNTERWEIGHT
      • Removal And Installation
    • ENGINE COVER
      • Removal And Installation
    • ENGINE SIDE COVERS
      • Removal And Installation
    • FRONT MUDGUARD
      • Removal And Installation
    • PARKING LEVER
      • Removal And Installation
    • FUEL TANK
      • Removal And Installation
    • GRILLE FRAME
      • Removal And Installation
    • GRILLE
      • Removal And Installation
    • KINGPOST
      • Removal And Installation
    • SIDE SHIFT
      • Removal And Installation
    • BACKHOE ARM
      • Removal And Installation
    • FRONT CONSOLE
      • Removal And Installation
    • STABILIZER WEAR PADS
      • Adjustment
    • LOADER LIFT ARMS
      • Removal And Installation
    • REAR WINDOW
      • Removal And Installation
    • CAB DOOR
      • Removal And Installation
    • FLOOR PANELS
      • Removal And Installation
    • OPERATOR SEAT
      • Removal And Installation
    • WINDOW FLUID RESERVOIR
      • Removal And Installation
  • ALPHABETICAL INDEX

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