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Bobcat L28 Loader Articulated Service Manual (SN B4LD11001-B4LD99999)

Format: PDF (Printable Document)

File Language: English

File Pages: 581

File Size: 14.47 MB (Speed Download Link)

Brand: Bobcat

Model: L28 Loader Articulated

Book No: 7389400

Serial No: SN B4LD11001-B4LD99999

Type of Document: Service Manual

Categories: ,

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Bobcat L28 Loader Articulated Service Manual (SN B4LD11001-B4LD99999)

The L28 articulated loader is a small yard and landscape machine that sneaks through tight gates, runs pallet forks and buckets, and lives on farms and rental lots. The people who reach for this service manual are the ones actually pulling hoses, testing charge pressure, and chasing electrical gremlins, not just driving the machine. They want the right tear-down sequence, wiring colors, and pressure test points so they don't waste half a day and three parts runs guessing.

What this manual helps you do

  • Diagnose weak drive or lift by checking hydrostatic and hydraulic test ports and comparing readings to spec ranges
  • Trace and repair electrical issues using wiring diagrams, connector callouts, and harness routing info
  • Follow step-by-step removal and installation for major components like drive motors, cylinders, and the Bob-Tach system
  • Rebuild and adjust hydraulic components with correct disassembly order, inspection points, and reassembly procedures
  • Set and verify linkages, safety interlocks, and control adjustments after repairs so the loader operates correctly

Who this is for

This is for anyone working on a Bobcat L28 articulated loader with a serial number between B4LD11001 and B4LD99999: small contractors, owner-operators, rental fleets, and shop or field techs. If you only need basic controls, daily checks, or safety info, you want the operator's handbook instead, not this manual.

FAQ

Q: Is this a searchable PDF, and can I read the wiring diagrams on a laptop or tablet?

A: These manuals are usually searchable PDFs and the wiring diagrams are meant to be zoomed in, so they're readable on a decent screen.

Q: How do I know if it covers my exact L28?

A: If your loader's serial number falls between B4LD11001 and B4LD99999, this is the right manual. If it's outside that range, you need a different one.

Q: Is this the right document if I'm doing my own repairs?

A: Yes, this is the workshop-level service manual, meant for real repairs and diagnostics, not just basic operation or parts lookup.

Bottom line: If you own or wrench on an L28 in that serial range and you're doing your own repairs, this is the manual you want.

📘 Show Index

Table of Contents:

  • MAINTENANCE SAFETY
  • FOREWORD
    • FOREWORD
    • SAFETY INSTRUCTIONS
      • Call Before You Dig
      • Silica Dust Exposure
    • FIRE PREVENTION
      • Operation
      • Maintenance
      • Operation
      • Electrical
      • Hydraulic System
      • Fueling
      • Starting
      • Spark Arrester Exhaust System
      • Welding And Grinding
      • Fire Extinguishers
    • SERIAL NUMBER LOCATIONS
      • Small Articulated Loader Serial Number
      • Engine Serial Number
    • DELIVERY REPORT
      • Machine Front
      • Machine Rear
  • SAFETY AND MAINTENANCE
    • LIFTING AND BLOCKING THE SMALL ARTICULATED LOADER
      • Lifting And Blocking Procedure
    • LIFT ARM SUPPORT
      • Lift Arm Support Description
      • Installing Lift Arm Support
      • Removing Lift Arm Support
    • OPERATOR ENCLOSURE
      • Operator Enclosure Description
    • TRANSPORTING THE MACHINE
      • Loading And Unloading
      • Fastening
    • TOWING THE MACHINE
      • Towing Machine
    • REMOTE START TOOL (SERVICE TOOL) KIT – 7217666
      • Remote Start Tool Description
      • Remote Start Tool – 7022042
      • Service Tool Harness – 6689747
      • Computer Service Tool Harness – 6689746
    • SERVICE SCHEDULE
      • Maintenance Intervals
    • ENGINE AIR CLEANER
      • Replacing Engine Air Cleaner Filters
    • ENGINE COOLING SYSTEM
      • Cleaning Engine Cooling System
      • Checking And Adding Coolant
      • Replacing Coolant
    • FUEL SYSTEM
      • Fuel Specifications
      • Biodiesel Blend Fuel
      • Filling The Fuel Tank
      • Removing Water From Fuel Filter
      • Replacing 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 Hydraulic Fluid
      • Hydraulic Fluid Chart
      • Replacing Hydraulic Fluid
      • Replacing Hydraulic / Hydrostatic Filter
    • BOB-TACH (HAND LEVER)
      • Inspecting And Maintaining Hand Lever Bob-Tach
    • BOB-TACH (POWER)
      • Inspecting And Maintaining Power Bob-Tach
    • MACHINE LUBRICATION
      • Lubricating Grease Fittings
      • Lubrication Locations
    • TIRE MAINTENANCE
      • Checking Wheel Nut Torque
      • Mounting Tires
    • MACHINE STOARGE AND RETURN TO SERVICE
      • Extended Storage Procedure
      • Returning The Machine To Service
    • STOPPING THE ENGINE AND LEAVING THE MACHINE
      • Stopping The Engine And Leaving The Machine
    • EMERGENCY EXIT
      • Performing An Emergency Exit
    • SEAT BELT
      • Inspecting And Maintaining The Seat Belt
    • SPARK ARRESTER
      • Cleaning Spark Arrester Muffler
  • HYDRAULIC SYSTEM
    • HYDRAULIC / HYDROSTATIC SCHEMATICS
    • HYDRAULIC SYSTEM INFORMATION
      • Glossary Of Hydraulic / Hydrostatic Symbols
      • Troubleshooting The Hydraulic System
      • Articulation Joint Hydraulic Hose Routing
    • LIFT CYLINDER
      • Testing Lift Cylinder
      • Removing And Installing Lift Cylinder
      • Parts Identification
      • Disassembling Lift Cylinder
      • Assembling Lift Cylinder
    • TILT CYLINDER
      • Testing Tilt Cylinder
      • Removing And Installing Tilt Cylinder
      • Parts Identification
      • Disassembling Tilt Cylinder
      • Assembling Tilt Cylinder
    • LEVELING CYLINDER
      • Testing Leveling Cylinder
      • Removing And Installing Leveling Cylinder
      • Parts Identification
      • Disassembling Leveling Cylinder
      • Assembling Leveling Cylinder
    • TELESCOPIC CYLINDER
      • Testing Telescopic Cylinder
      • Removing And Installing Telescopic Cylinder
      • Parts Identification
      • Disassembling Telescopic Cylinder
      • Assembling Telescopic Cylinder
    • STEERING CYLINDER
      • Testing Steering Cylinder
      • Removing And Installing Steering Cylinder
      • Parts Identification
      • Disassembling Steering Cylinder
      • Assembling Steering Cylinder
    • MAIN RELIEF VALVE
      • Main Relief Valve Description
      • Testing Main Relief Valve
      • Removing And Installing Main Relief Valve
      • Adjusting Main Relive Valve
    • PORT RELIEF VALVE
      • Port Relief Valve Description
      • Testing Lift Port Relief Valve (Base End)
      • Testing Lift Port Relief Valve (Rod End)
      • Tilt Port Relief Valve Testing
    • HYDRAULIC CONTROL VALVE
      • Hydraulic Control Valve Description
      • Removing And Installing Hydraulic Control Valve
      • Identification Chart
      • Disassembling Hydraulic Control Valve
      • Disassembling And Assembling End Valve Section
      • Disassembling And Assembling End Valve Section
      • Disassembling And Assembling Lift Valve Section
      • Disassembling And Assembling Tilt Valve Section
      • Disassembling And Assembling Telescopic Valve Section
      • Disassembling And Assembling Auxiliary Valve Section
      • Assembling Hydraulic Control Valve
    • PILOT MANIFOLD
      • Pilot Manifold Description
      • Removing And Installing Pilot Manifold
      • Parts Identification
      • Disassembling And Assembling Pilot Manifold
    • LIFT ARM CONTROL (BYPASS)
      • Lift Arm Control (Bypass) Description
      • Testing Lift Arm Control (Bypass)
    • IMPLEMENT PUMP
      • Implement Pump Description
      • Testing Lift, Tilt, Telescopic, And Auxiliary Sections
      • Removing And Installing Implement Pump
      • Parts Identification
      • Disassembling And Assembling Implement Pump
    • STEERING CONTROL UNIT
      • Steering Control Unit Description
      • Removing And Installing Steering Control Unit
      • Parts Identification
      • Disassembling And Assembling Steering Control Unit
    • HYDRAULIC / HYDROSTATIC FILTER
      • Hydraulic / Hydrostatic Filter Description
      • Removing And Installing Housing
    • JOYSTICK
      • Joystick Description
      • Removing And Installing Handle
    • HYDRAULIC FLUID RESERVOIR
      • Hydraulic Fluid Reservoir Description
      • Removing And Installing Hydraulic Reservoir
      • Removing And Installing Hydraulic Fluid Screen
    • OIL COOLER
      • Oil Cooler Description
      • Removing And Installing Oil Cooler
    • DRIVE PEDAL
      • Removing And Installing Drive Pedal
      • Disassembling And Assembling Drive Pedal
    • POWER BOB-TACH BLOCK
      • Power Bob-Tach Description
      • Removing And Installing Power Bob-Tach
      • Disassembling And Assembling Power Bob-Tach
    • AUXILIARY HYDRAULIC COUPLER BLOCK
      • Coupler Block Description
      • Removing And Installing Coupler Block
      • Disassembling And Assembling Coupler Block
    • TELESCOPIC MANIFOLD
      • Telescopic Manifold Description
      • Removing And Installing Telescopic Manifold
      • Disassembling And Assembling Telescopic Manifold
    • TRACTION ASSIST
      • Traction Assist Description
      • Removing And Installing Traction Assists
      • Disassembling And Assembling Traction Assist
    • CASE DRAIN MANIFOLD
      • Case Drain Manifold Description
      • Removing And Installing Case Drain Manifold
  • HYDROSTATIC SYSTEM
    • HYDROSTATIC SYSTEM INFORMATION
      • Troubleshooting
      • Hydrostatic System Description
    • HYDROSTATIC MOTOR (SAPR BRAKE)
      • Hydrostatic Motor (SAPR Brake) Description
      • Removing And Installing Hydrostatic Motor (SAPR Brake)
      • Parts Identification
      • Disassembling Hydrostatic Motor (SAPR Brake)
      • Assembling Hydrostatic Motor (SAPR Brake)
    • HYDROSTATIC MOTOR
      • Hydrostatic Motor Description
      • Removing And Installing Hydrostatic Motor
      • Parts Identification
      • Disassembling Hydrostatic Motor
      • Assembling Hydrostatic Motor
    • HYDROSTATIC PUMP
      • Hydrostatic Pump Description
      • Removing And Installing Hydrostatic Pump
      • Parts Identification
      • Disassembling And Assembling Hydrostatic Pump
    • TURF TRACTION MANIFOLD
      • Turf Traction Manifold Description
      • Removing And Installing Turf Traction Manifold
      • Disassembling And Assembling Turf Traction Manifold
  • MAINFRAME
    • ENCLOSURE
      • Removing And Installing Enclosure
      • Removing And Installing Front Window
      • Removing And Installing Wiper Motor
      • Removing And Installing Rear Window
      • Removing And Installing Side Window
      • Removing And Installing Door
      • Removing And Installing Armrest
      • Removing And Installing Dash Cover
      • Removing And Installing Steering Wheel
      • Removing And Installing Operator Seat
      • Removing And Installing Floor Panel
    • BOB-TACH HAND LEVER
      • Bob-Tach Hand Lever Description
      • Removing And Installing Bob-Tach Hand Lever
      • Disassembling And Assembling Bob-Tach Hand Lever
      • Disassembling And Assembling Bob-Tach Hand Lever
    • BOB-TACH POWER
      • Removing And Installing Bob-Tach Power
      • Disassembling And Assembling Bob-Tach Power
    • PIVOT LINK
      • Removing And Installing Pivot Link
    • LIFT ARM
      • Removing And Installing Lift Arm
    • TELESCOPIC LIFT ARM
      • Removing And Installing Telescopic Lift Arm
      • Inspecting Lift Arm Wear Pads – Extended
      • Inspecting Lift Arm Wear Pads – Retracted
    • REAR COVER
      • Removing And Installing Rear Cover
    • RIGHT REAR COVER
      • Removing And Installing Right Rear Cover
    • LEFT REAR COVER
      • Removing And Installing Left Rear Cover
    • CENTER COVER
      • Removing And Installing Center Cover
    • PUMP COVER
      • Removing And Installing Pump Cover
    • RIGHT FRONT COVER
      • Removing And Installing Right Front Cover
    • RIGHT CORNER COVER
      • Removing And Installing Right Corner Cover
    • LEFT FRONT COVER
      • Removing And Installing Left Front Cover
    • COUNTERWEIGHT
      • Removing And Installing Counterweight
    • FUEL TANK
      • Removing And Installing Fuel Tank
      • Removing And Installing Fuel Level Sender
    • ENCLOSURE BUMPERS
      • Removing And Installing Enclosure Bumpers
    • REAR GRILLE
      • Removing And Installing Rear Grille
    • ARTICULATION PIN
      • Removing And Installing Articulation Pin
  • ELECTRICAL SYSTEM AND ANALYSIS
    • ELECTRICAL SCHEMATICS
    • ELECTRICAL SYSTEM INFORMATION
      • Glossary Of Electrical Symbols
      • Electrical System Troubleshooting Chart
      • Electrical System Description
      • Fuse And Relay Location / Identification
    • BATTERY
      • Battery Maintenance
      • Maintaining Battery Charge Level
      • Battery Service During Machine Storage
      • Testing Battery
      • Charging Battery
      • Removing And Installing The Battery
      • Using A Booster Battery (Jump Starting)
    • ALTERNATOR
      • Adjusting Belt
      • Replacing Belt
      • Charging System Inspection
      • Testing Alternator Voltage
      • Removing And Installing Alternator
      • Parts Identification
    • STARTER
      • Testing Starter
      • Removing And Installing Starter
      • Parts Identification
    • INSTRUMENT PANEL
      • Removing And Installing Display Panel
    • LIGHTS
      • Removing And Installing Front lights
      • Removing And Installing Rear Light
    • GATEWAY CONTROLLER
      • Controller Description
      • Removing And Installing Gateway Controller
    • DIAGNOSTIC SERVICE CODES
      • Viewing Service Codes
      • Service Codes List
    • OPERATING INTERLOCK CONTROL SYSTEM
      • Operating Interlock Control System Description
      • Operating The Operator Interlock Control System
      • Inspecting The Operating Interlock Control System
      • Inspecting Deactivation Of The Auxiliary Hydraulics System (Engine STOPPED – Key On)
      • Inspecting The Armrest Sensor (Engine RUNNING)
      • Inspecting The Travel Pedal Interlocks (Engine RUNNING)
      • Inspecting The Lift Arm Bypass Control
    • ARMREST SENSOR
      • Armrest Sensor Description
      • Removing And Installing Armrest Sensor
    • SERVICE PC (LAPTOP COMPUTER)
      • Connecting The Remote Start Tool (Service Tool)
    • ELECTRIC COOLING FAN
      • Electric Cooling Fan Description
      • Removing And Installing Electric Cooling Fan
    • BACK-UP ALARM
      • Back-up Alarm Description
      • Inspecting Back-up Alarm
      • Troubleshooting Back-up Alarm
      • Removing And Installing Back-up Alarm
    • FRONT HORN
      • Removing And Installing Front Horn
      • Troubleshooting
    • FUEL LEVEL SENDER
      • Removing And Installing Fuel Level Sender
      • Testing Fuel Level Sender
    • KEY SWITCH
      • Removing And Installing Key Switch
    • BATTERY DISCONNECT SWITCH
      • Battery Disconnect Switch Description
      • Removing And Installing Battery Disconnect Switch
  • ENGINE SERVICE
    • ENGINE INFORMATION
      • Engine Description
      • Specifications
      • Crankshaft Re-Grind Data
      • Torque For Kubota® Metric Bolts
      • Troubleshooting
      • Removing And Installing Engine
      • Checking Compression
    • ENGINE SPEED CONTROL (LEVER)
      • Removing And Installing Engine Speed Control (Lever)
      • Calibrating Engine Speed Control
    • MUFFLER
      • Removing Muffler
      • Installing Muffler
    • EXHAUST PIPE
      • Removing And Installing Exhaust Pipe
    • AIR CLEANER
      • Removing And Installing Air Cleaner
    • ENGINE COOLING SYSTEM
      • Removing And Installing Coolant Recovery Tank
      • Removing And Installing Radiator
      • Removing And Installing Fan And Pulley
      • Removing And Installing Water Pump
      • Assembling And Disassembling Water Pump
      • Removing And Installing Thermostat Housing
      • Checking Thermostat
    • LUBRICATION SYSTEM
      • Removing And Installing Oil Pan
      • Removing And Installing Oil Pump
      • Inspecting Oil Pump
      • Testing Engine Oil Pressure
    • FUEL SYSTEM
      • Checking Fuel Shutoff Solenoid
      • Removing And Installing Fuel Shutoff Solenoid
      • Checking Fuel Injection Pump
      • Removing And Installing Fuel Injection Pump
      • Timing Fuel Injection Pump
      • Removing And Installing Fuel Camshaft
      • Fuel Camshaft Governor
      • Removing And Installing Fuel Injector
      • Checking Fuel Injector Nozzle Pressure
      • Checking Nozzle Spray Condition
      • Valve Seat Tightness
    • CYLINDER HEAD
      • Testing Glow Plugs
      • Removing And Installing Glow Plugs
      • Adjusting Valve Clearance
      • Checking Valve Timing
      • Removing And Installing Cylinder Head
      • Disassembling And Assembling Cylinder Head
      • Servicing Cylinder Head
      • Clearance Cylinder Head Top
      • Checking Valve Guide
      • Removing And Installing Valve Guide
      • Reconditioning The Valve And Valve Seat
      • Checking Valve Spring
      • Checking Valve Tappets
      • Checking Rocker Arm And Shaft
      • Checking Push Rod Alignment
    • CRANKSHAFT AND PISTONS
      • Removing And Installing Piston And Connecting Rod
      • Servicing Piston And Connecting Rod
      • Checking Cylinder Bore
      • Connecting Rod Alignment
      • Removing And Installing Crankshaft Gear
      • Removing And Installing Crankshaft And Bearings
      • Servicing Crankshaft And Bearings
    • CAMSHAFT AND TIMING GEARS
      • Removing And Installing Timing Gearcase Cover
      • Checking Timing Gears Backlash
      • Removing And Installing Idler Gear And Shaft
      • Servicing Camshaft
      • Servicing Idler Gear And Shaft
    • FLYWHEEL AND HOUSING
      • Removing And Installing Hydrostatic Pump Coupler
      • Removing And Installing Flywheel
      • Removing And Installing Flywheel Ring Gear
  • HEATING AND VENTILATION
    • REGULAR MAINTENANCE
      • Maintaining Fresh Air / Recirculation Filter
    • TROUBLESHOOTING
      • Blower Motor Does Not Operate
      • Blower Motor Operates Normally, But Air Flow Is Insufficient
      • Electrical System
    • HEATER UNIT
      • Removing And Installing Heater Unit
    • HEATER VALVE
      • Removing And Installing Heater Valve
    • HEATER COIL
      • Removing And Installing Heater Coil
    • BLOWER FAN
      • Removing And Installing Blower Fan
  • SPECIFICATIONS
    • SMALL ARTICULATED LOADER SPECIFICATIONS
      • Machine Dimensions
      • Performance Specifications
      • Controls Specifications
      • Engine Specifications
      • Hydraulic System Specifications
      • Electrical System Specifications
      • Drive System Specifications
      • Capacities Specifications
      • Tire Specifications
    • TECHNICAL SERVICE GUIDE SPECIFICATIONS
      • Engine
      • Engine Torques
      • Small Articulated Loader Torques
      • Cooling System
    • TORQUE SPECIFICATION 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
      • O-ring Flare Fitting
      • Port Seal Fitting
      • Push To Connect Fittings
    • HYDRAULIC FLUID SPECIFICATIONS
      • Specifications
    • CONVERSIONS
      • Decimal And Millimeter Equivalent Chart
      • U.S. To Metric Conversion Chart
    • SERVICE TOOLS REQUIRED
      • Remote Start Tools
      • Hydraulic Tools
      • Engine Tools
      • Electrical Tools
  • ALPHABETICAL INDEX

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