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Bobcat 320 Excavator Service Manual (SN 511720001-511799999)

Format: PDF (Printable Document)

File Language: English

File Pages: 356

File Size: 10.16 MB (Speed Download Link)

Brand: Bobcat

Model: 320 Excavator

Book No: 6722642

Serial No: SN 511720001-511799999

Type of Document: Service Manual

Categories: ,

$ 45

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Bobcat 320 Excavator Service Manual (SN 511720001-511799999)

A Bobcat 320 mini excavator is a tight-quarters digger for footings, utility lines, and small site work. The people who reach for this service manual are the ones actually turning wrenches: shop mechanics, field techs, and owners who want to stop guessing. They're trying to get hard data for repairs, not general safety tips. If you're chasing hydraulic issues, engine problems, or electrical gremlins on a 320 in this serial range, this is the book you reach for.

What this manual helps you do

  • Diagnose no-move or weak-drive complaints in the hydrostatic system and trace them to pumps, motors, or control valves
  • Check, set, and verify hydraulic pressures using the correct test ports and adjustment points
  • Follow teardown and reassembly steps for cylinders, control valves, and other hydraulic components
  • Troubleshoot engine starting, smoking, or power loss with step-by-step checks instead of guesswork
  • Read wiring diagrams to chase down shorts, opens, and bad connections in the 12V electrical system

Who this is for

This is for anyone maintaining or repairing a Bobcat 320 excavator with serial numbers from 511720001 to 511799999: small contractors, rental fleets, owner-operators, and shop mechanics. If you only need to learn how to run the machine or daily checks, you want the operator's handbook instead, not this service manual.

FAQ

Q: Is this a searchable PDF, and can I zoom in on wiring diagrams?

A: These manuals are usually supplied as searchable PDFs, and you can zoom in to make the wiring diagrams readable on a laptop or tablet.

Q: How do I know if it fits my exact 320?

A: Check your serial plate. If your 320's serial number falls between 511720001 and 511799999, this is the correct service manual group.

Q: Is this the right document for full repairs, not just basic maintenance?

A: Yes, this is the workshop-level service manual, meant for real repairs and diagnostics, not just routine greasing and fluid checks.

Bottom line: If your 320's serial number is in that range and you're doing real repair work, this is the right manual. If not, you should look for the manual that matches your serial group.

📘 Show Index

Table of Contents:

  • MAINTENANCE SAFETY
  • CONTENTS
    • FOREWORD
    • SAFETY INSTRUCTIONS
    • SERIAL NUMBER LOCATIONS
    • HYDRAULIC EXCAVATOR SERIAL NUMBER
    • ENGINE SERIAL NUMBER
    • DELIVERY REPORT
    • HYDRAULIC EXCAVATOR IDENTIFICATION
  • PREVENTIVE MAINTENANCE
    • SERVICE SCHEDULE
    • ENGINE COVER
      • Opening the Cover
    • AIR CLEANER SERVICE
    • FUEL SYSTEM
      • Fuel System Service
      • Maintenance
      • Fuel Filter
    • ENGINE LUBRICATION SYSTEM
      • Engine Oil and Filter Replacement
    • COOLING SYSTEM
      • Coolant Level
      • Coolant Replacement
    • HYDRAULIC SYSTEM
      • Checking and Add Fluid
      • Diagnostic Couplers
      • Replacement of the Hydraulic Filter
      • Hydraulic Reservoir
      • Replacement of the Hydraulic Fluid
    • USING A BOOSTER BATTERY (JUMP STARTING)
      • Procedure
    • LUBRICATION OF THE HYDRAULIC EXCAVATOR
      • Procedure
  • HYDRAULIC SECTION
    • HYDRAULIC SCHEMATICS
    • HYDRAULIC SYSTEM TROUBLESHOOTING
    • HYDRAULIC SERVICE INFORMATION
      • Checking the Main Relief Valves
      • Checking the Hydraulic Pump
    • HYDRAULIC PUMP
      • Disassembly
      • Assembly
    • HYDRAULIC CONTROL VALVE (6–Spool) DUKES VALVE (S/N 511720001–511721411)
      • Removal And Installation
      • Parts Identification
      • Disassembly
      • Inlet Section (R.H. and L.H. Travel)
        • Disassembly
        • Assembly
      • Valve Sections (Boom, Bucket & Arm)
        • Disassembly
        • Assembly
      • Valve Sections (Auxiliary)
        • Disassembly
        • Assembly
      • Assembly
      • Port Relief Valve
        • Disassembly
        • Assembly
        • Adjustment
      • Main Relief Valve
        • Disassembly
        • Assembly
        • Adjustment
    • HYDRAULIC CONTROL VALVE (3–Spool) DUKESVALVE (S/N 511720001–511721411)
      • Removal And Installation
      • Parts Identification
      • Disassembly
      • Inlet Section (Housing Swing)
        • Disassembly
        • Assembly
      • End Cover (Boom Swing) and Valve Section (Blade)
        • Disassembly
        • Assembly
      • Load Check Block
        • Disassembly
        • Assembly
      • Build–Up Valve
        • Assembly
      • Main Relief Valve
        • Disassembly
        • Assembly
        • Adjustment
    • HYDRAULIC CONTROL VALVE (6–Spool) HUSCO VALVE(S/N 511721412 & Above)
      • Parts Identification
      • Disassembly
      • Inlet Section Disassembly And Assembly
      • Right Hand & Left Hand Travel Section
        • Disassembly
        • Assembly
      • Boom, Bucket & Arm Section
        • Disassembly
        • Assembly
      • Auxiliary Section
        • Disassembly
        • Assembly
    • PORT RELIEF VALVES HUSCO VALVE
      • Parts Identification
      • Port Relief Valve Pressure Setting
      • Disassembly
      • Assembly
      • Adjustment
    • MAIN RELIEF VALVES HUSCO VALVE
      • Parts Identification
      • Disassembly
      • Assembly
      • Adjusting The Main Relief Valves
    • HYDRAULIC CONTROL VALVE (3–Spool) HUSCO VALVE (S/N 511721412 & Above)
      • Parts Identification
      • Disassembly
      • Blade And Boom Swing Section
        • Disassembly
        • Assembly
      • Lockout Valve Assembly
        • Disassembly
        • Lockout Valve Assembly
      • Swing Motor Valve Section
        • Disassembly
        • Assembly
      • Build–Up Valve Disassembly
      • Build Up Valve Assembly
      • Build Up Valve Test Procedure
    • BOOM CYLINDER
      • Removal And Installation
      • Boom Shield
      • Boom Cylinder
    • ARM CYLINDER
      • Removal And Installation
    • BUCKET CYLINDER
      • Removal And Installation
    • BLADE CYLINDER
      • Removal And Installation
    • BOOM SWING CYLINDER
      • Removal And Installation
    • HYDRAULIC CYLINDER
      • Disassembly
      • Assembly
      • Disassembly
      • Assembly
    • HYDRAULIC FILTER ASSEMBLY
      • Removal And Installation
    • AUXILIARY COUPLERS
      • Removal And Installation
    • JOYSTICK MANIFOLD WITH ACCUMULATOR
      • Removal And Installation
      • Disassembly And Assembly
    • DRAIN BLOCK
      • Filter Screen
      • Removal And Installation
    • OIL COOLER
      • Removal And Installation
    • JOYSTICK CONTROL CHANGE
  • DRIVE SECTION
    • FLOORMAT AND FLOOR PANELS
      • Removal and Installation
    • LEFT CONTROL CONSOLE
      • Microswitch Adjustment Procedure
      • Lockout Microswitch Removal and Installation
      • Console Cover Removal and Installation
      • Joystick Removal and Installation
      • Removal and Installation
    • FUEL TANK
      • Removal and Installation
    • LOCK LEVER
      • Left Hand Removal and Installation
      • Adjustment Procedure
    • LATCH HOOK
      • Left Hand Removal and Installation
    • GAS SPRING
      • Left Hand Removal and Installation
    • UPPER CONSOLE
      • Left Hand Removal and Installation
    • RIGHT CONTROL CONSOLE
      • ROPS Canopy Models
      • Cab Models
      • Console Cover Removal and Installation
      • Joystick Removal and Installation
      • Control Console Removal and Installation
      • Hydraulic Tank Removal and Installation
    • TRAVEL LEVERS
      • Removal and Installation
    • RIGHT HAND PEDAL (Boom Swing)
      • Removal and Installation
    • LEFT HAND PEDAL (Auxiliary)
      • Removal and Installation
    • ROCKERSHAFT
      • Removal and Installation
    • LINKAGE RODS
      • Removal and Installation
    • BLADE LEVER
      • Removal and Installation
    • FINAL DRIVE
      • Removal and Installation
    • DRIVE MOTOR ASSEMBLY (Kayaba) (S/N 511720001 – 23974)
      • Parts Identification
      • Disassembly
      • Assembly
      • Checking Oil Level
      • Draining Final Drive Case
    • DRIVE MOTOR (SOM) (S/N 23975 & Above)
      • Parts Identification
      • Disassembly
      • Assembly
      • Checking Oil Level (S/N 23975 & Above)
    • JOYSTICK
      • Parts Identification
      • Disassembly and Assembly
  • UPPER WORKS AND SWING SECTION
    • SWING MOTOR
      • Testing the Cross Ports Reliefs
      • Start the Engine
      • Removing the Cross Port Reliefs
      • Removal and Installation
      • Disassembly
      • Assembly
      • Motor Timing
    • CROSS PORT RELIEF VALVE
      • Disassembly
      • Assembly
      • Description
    • UPPERSTRUCTURE
      • Removal
      • Installation
    • CENTER SWIVEL JOINT
      • Removal And Installation
      • Disassembly and Assembly
    • SWING CIRCLE GEAR
      • Removal And Installation
    • ROPS CANOPY
      • Removal And Installation
    • CAB
      • Removal And Installation
      • Door (Removal And Installation)
      • Front Window (Removal And Installation)
      • Front Lower Glass (Removal And Installation)
      • Front Upper Plexiglass (Removal And Installation)
      • Door Glass (Removal And Installation)
      • Left Hand Side Glass (Removal And Installation)
      • Rear Glass (Removal And Installation)
      • Right Hand Side Glass (Removal And Installation)
    • CAB/CANOPY REAR COVER
      • Removal
      • Installation
    • AIR BAFFLE (Cab Models Only)
      • Removal And Installation
    • BELLY PAN (Field Installed)
      • Removal And Installation
  • MAIN FRAME AND TRACKS
    • ENGINE COVER
      • Removal and Installation
    • REAR CORNER POSTS
      • Removal and Installation
    • SEAT AND SEAT MOUNT
      • Removal and Installation
    • SPEED CONTROL LEVER/SWING LOCK LEVER AND MOUNTING
      • Removal and Installation
    • BUCKET
      • Removal and Installation
      • Installation
    • ARM
      • Removal and Installation
    • BOOM
      • Removal and Installation
    • SWING POST
      • Removal And Installation
      • Bushing Replacement
      • Swing Post Bushing Removal
      • Bushing Installation
    • TRACK
      • Track Tension Adjustment
      • Removal and Installation
      • Damage Identification and Causes
    • TRACK FRAME
      • Disassembly and Assembly
    • TRACK IDLER
      • Parts Identification
      • Disassembly
      • Assembly
    • TRACK ROLLER
      • Parts Identification
      • Disassembly
      • Assembly
    • TRACK
      • Damage Identification and Causes
  • ELECTRICAL SYSTEM
    • ELECTRICAL SCHEMATIC
    • TROUBLESHOOTING
    • ELECTRICAL SYSTEM
      • Description
      • Fuses
      • Electrical System Service
    • BATTERY
      • Checking the Battery
      • Removal and Installation
    • BATTERY BOX
      • Removal and Installation
    • CAB ELECTRICAL (Cab Option)
    • ALTERNATOR
      • Checking the Alternator Output
      • Belt Adjustment
      • Electrical Connection
      • Removal and Installation
      • Check the Alternator Output
      • Alternator Output Test
      • Alternator Regulator Test
      • Disassembly and Assembly
      • Stator Continuity Test
      • Stator Ground Test
      • Rotor Continuity Test
      • Rotor Ground Test
      • Rectifier Continuity (Diode) Test
      • Disassembly and Assembly (New Style)
    • STARTER
      • Removal and Installation
      • Disassembly and Assembly
      • Cleaning and Inspection
    • HORN
      • Removal and Installation
    • FUEL LEVEL SENDER
      • Removal and Installation
  • ENGINE SERVICE
    • TROUBLESHOOTING
    • VALVE CLEARANCE
      • Adjustment
    • ENGINE COMPRESSION
      • Checking
    • FUEL FILTER
      • Element
      • Removing Air from the Fuel System
      • Removal and Installation
    • FUEL INJECTION PUMP
      • Checking the Injection Pump
      • Removal and Installation
      • Timing the Injection Pump
    • FUEL INJECTOR NOZZLES
      • Checking the Injector Nozzle
    • GLOW PLUGS
      • Removal and Installation
      • Checking the Glow Plug
    • ENGINE
      • Removal and Installation
    • SPARK ARRESTOR MUFFLER
    • RADIATOR
      • Checking the Radiator and Radiator Cap
      • Removal and Installation
      • Hydraulic Pump Coupler
    • CYLINDER HEAD
      • Removal of the Cylinder Head
      • Disassembly of the Cylinder Head
      • Servicing the Cylinder Head and Valves
      • Checking Valve Springs
      • Checking Rocker Arm and Shaft
      • Installing the Cylinder Head
    • TIMING GEAR COVER
      • Removal and Installation
    • TIMING GEAR, CAMSHAFT AND OIL PUMP
      • Removal and Installation
      • Oil Pump Service
      • Servicing the Camshaft
    • CRANKSHAFT AND PISTONS
      • Removal and Installation
      • Crankshaft Service
      • Servicing the Connecting Rods and Pistons
    • CYLINDER LINERS
      • Checking the Cylinder Liners
      • Cylinder Liner Installation
    • WATER PUMP
      • Removal and Installation
      • Disassembly and Assembly
  • SPECIFICATIONS
    • HYDRAULIC EXCAVATOR SPECIFICATIONS
      • Machine Dimensions
      • Lifting Capacity
      • SPECIFICATIONS
    • ENGINE SPECIFICATIONS
      • Engine
      • Fuel Injector Nozzles
      • Fuel Injection Pump
      • Cylinder Head
      • Valves
      • Valve Springs
      • Rocker Arms
      • Camshaft
      • Cylinders
      • Piston Rings
      • Pistons
      • Crankshaft
      • Oil Pump
      • Thermostat
      • Engine Torque
      • Crankshaft Re–Grind Data
    • FUEL, COOLANT AND LUBRICANTS
    • OIL SPECIFICATIONS
    • BUCKET SPECIFICATIONS
  • SERVICE MANUAL REVISON
    • 320-1
    • 320-2
    • 320-3
    • 320-4
    • 320-5

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