A Bobcat 320 is a small mini-ex you drag to tight jobs for trenching, service lines, and cleanup where a skid steer is too clumsy. The person who reaches for this manual is the one actually fixing the thing when it quits digging or starts puking oil. They're trying to cut downtime, not guess at hydraulic routing or how the swing motor comes apart. Around my shop, this is what I'd open when I'm past simple filters and grease and I'm into real repairs.
What this manual helps you do
- Diagnose hydraulic problems, trace hoses and valves, and check reliefs and functions on a 320 in the listed serial range
- Follow teardown and reassembly steps on cylinders, drive motors, and other major hydraulic components
- Rebuild or replace engine and drivetrain parts with the right sequences and adjustment procedures
- Troubleshoot electrical issues using wiring diagrams you can zoom in on and follow by color and pin number
- Set and verify machine adjustments after a repair so the excavator digs straight and tracks right
Who this is for
This is for a small contractor, owner-operator, field tech, or shop mechanic working on a Bobcat 320 with serial number between 223911001 and 223999999. If you're just looking for how to run the machine or basic maintenance intervals, you want the operator's handbook instead.
FAQ
Q: Is this a searchable PDF and are the wiring diagrams readable?
A: Yes, it's a PDF you can search, and you can zoom in on the wiring diagrams so you can actually read wire labels and connector IDs.
Q: How do I know it fits my machine?
A: Check your serial plate. If your 320 serial falls between 223911001 and 223999999, this is the right manual.
Q: Is this the right document if I'm doing real repairs, not just fluids?
A: Yes, this is the workshop service manual, the one you use for diagnostics, teardown, and reassembly, not just basic service.
Bottom line: If your 320's serial number is in that 223911001-223999999 window and you're doing your own repairs, this is the manual you want. If it's not in that range, don't buy it.
📘 Show Index
Table of Contents:
- MAINTENANCE SAFETY
- ALPHABETICAL INDEX
- CONTENTS
- SAFETY INSTRUCTIONS
- SERIAL NUMBER LOCATIONS
- Excavator Serial Number
- Engine Serial Number
- DELIVERY REPORT
- BOBCAT EXCAVATOR IDENTIFICATION
- SAFETY & MAINTENANCE
- LIFTING AND BLOCKING THE EXCAVATOR
- SWING LOCK
- LIFTING THE EXCAVATOR
- OPERATOR CAB ROPS/TOPS
- Emergency Exits
- Cab Door
- Front Window
- Right Side Windows
- TRANSPORTING THE EXCAVATOR
- TAILGATE
- Opening And Closing The Tailgate
- Adjusting The Bumper
- Adjusting The Tailgate Latch
- SERVICE SCHEDULE
- AIR CLEANER SERVICE
- Daily Check
- Replacing The Filters
- HEATER AIR FILTERS
- Recirculation Filter
- Fresh Air Filter
- ENGINE COOLING SYSTEM
- Cleaning The Cooling System
- Checking Coolant Level
- Replacing The Coolant
- FUEL SYSTEM
- Fuel Specifications
- Filling The Fuel Tank
- Removing Water From The Fuel Filter
- Replacing The Fuel Filter
- Draining The Fuel Tank
- Removing Air From The Fuel System
- ENGINE LUBRICATION SYSTEM
- Checking Engine Oil
- Oil Chart
- Replacing Oil And Filter
- HYDRAULIC SYSTEM
- Checking And Adding Hydraulic Oil
- Diagnostic Couplers
- Replacing The Hydraulic Filter
- Replacing Hydraulic Oil
- LUBRICATION OF THE HYDRAULIC EXCAVATOR
- TRAVEL MOTOR
- Checking Oil Level
- Draining The Travel Motor
- SPARK ARRESTOR MUFFLER
- ALTERNATOR BELT
- Adjusting The Alternator Belt
- SEAT BELT
- Inspection And Maintenance
- CONTROL CONSOLE LOCKOUTS
- Inspection And Maintenance
- HYDRAULIC SYSTEM
- HYDRAULIC/HYDROSTATIC SCHEMATICS
- HYDRAULIC SYSTEM INFORMATION
- Glossary Of Hydraulic/Hydrostatic Symbols For Excavators
- Troubleshooting The Hydraulic Circuit
- Troubleshooting The Cylinder Circuit
- Troubleshooting The Swing (Upperstructure Slew) Circuit
- Troubleshooting The Travel Circuit
- BOOM CYLINDER
- Testing
- Removal and Installation
- Parts Identification
- Disassembly
- Assembly
- ARM CYLINDER
- Testing
- Removal and Installation
- Parts Identification
- Disassembly
- Assembly
- BOOM SWING CYLINDER
- Testing
- Removal and Installation
- Parts Identification
- Disassembly
- Assembly
- BUCKET CYLINDER
- Testing
- Removal and Installation
- Parts Identification
- Disassembly
- Assembly
- BLADE CYLINDER
- Testing
- Removal and Installation
- Parts Identification
- Disassembly
- Assembly
- TRACK FRAME EXPANSION CYLINDER
- Testing
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- MAIN RELIEF VALVE
- Testing And Adjusting The Main Relief Valve
- PORT RELIEF VALVES
- Testing And Adjusting The Port Relief Valve Pressure
- CROSSPORT RELIEF VALVES
- Testing And Adjusting The Crossport Relief Valve
- PRESSURE REDUCING VALVE
- Testing And Adjusting The Pressure Reducing Valve
- HYDRAULIC CONTROL VALVE (320 / 322)
- Description
- Removal And Installation
- Parts Identification
- Disassembly
- Auxiliary Valve Section Disassembly And Assembly
- Blade Valve Section Disassembly And Assembly
- Slew Valve Section Disassembly And Assembly
- Left Travel Valve Section Disassembly and Assembly
- Boom Valve Section Disassembly and Assembly
- Bucket Valve Section Disassembly and Assembly
- Arm Valve Section Disassembly and Assembly
- Boom Swing Valve Section Disassembly And Assembly
- Right Travel Valve Section Disassembly And Assembly
- Assembly
- HYDRAULIC CONTROL VALVE (320L)
- Description
- Removal And Installation
- Parts Identification
- Disassembly
- Auxiliary Valve Section Disassembly And Assembly
- Blade Valve Section Disassembly And Assembly
- Slew Valve Section Disassembly And Assembly
- Left Travel Valve Section Disassembly And Assembly
- Boom Valve Section Disassembly And Assembly
- Bucket Valve Section Disassembly And Assembly
- Arm Valve Section Disassembly And Assembly
- Boom Swing Valve Section Disassembly And Assembly
- Right Travel Valve Section Disassembly And Assembly
- Assembly
- HYDRAULIC PUMP
- Testing The Hydraulic Pump
- Removal And Installation
- Coupler Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- MANIFOLD ASSEMBLY/ACCUMULATOR
- Description
- Removal And Installation
- Parts Identification (S/N 223911001 – 223911247 & S/N 224011001 – 224012293)
- Disassembly (S/N 223911001 – 223911247 & S/N 224011001 – 224012293)
- Assembly (S/N 223911001 – 223911247 & S/N 224011001 – 224012293)
- Parts Identification (S/N 223911248 & Above & S/N 224012294 & Above)
- Disassembly (S/N 223911248 & Above & S/N 224012294 & Above)
- Assembly (S/N 223911248 & Above & S/N 224012294 & Above)
- TRAVEL MOTOR
- Removal and Installation
- Parts Identification
- Disassembly
- Assembly
- SWIVEL JOINT
- Removal And Installation
- Parts Identification 320
- Parts Identification 322
- Disassembly
- Assembly
- SWING MOTOR
- Removal and Installation
- Parts Identification
- Disassembly
- Assembly
- CONTROL PATTERN SELECTOR VALVE
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- RIGHT CONTROL LEVER (JOYSTICK)
- Testing
- Handle Removal And Installation
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- LEFT CONTROL LEVER (JOYSTICK)
- Testing
- Handle Removal And Installation
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- HYDRAULIC FILTER MOUNT
- HYDRAULIC RESERVOIR
- OIL COOLER
- UNDERCARRIAGE
- BLADE
- Extension Removal And Installation
- Blade Removal And Installation
- TRACKS
- Track Lug Height
- Adjustment
- Removal And Installation
- TRACK FRAME
- Disassembly And Assembly
- Removal And Installation Of Expandable Track Frame (322 Only)
- Recoil Spring Disassembly And Assembly
- TRACK DAMAGE IDENTIFICATION
- Cutting Of The Steel Cords
- Causes Of The Damage
- Abrasion Of Embedded Metals
- Separation Of Embedded Metals
- Separation Of Embedded Metals Due To Corrosion
- Cuts On The Lug Side Rubber
- Cracks On The Lug Side Rubber Due To Fatigue
- Lug Abrasion
- Cracks And Cuts On The Lug Side Rubber
- Abrasion Of The Track Roller Side
- Cuts On The Edges Of The Track Roller Side
- TRACK IDLER
- Parts Identification
- Disassembly
- Assembly
- TRACK ROLLER
- Parts Identification
- Disassembly
- Assembly
- SWING CIRCLE GEAR
- UPPERSTRUCTURE & SWING SECTION
- UPPERSTRUCTURE
- ROPS CANOPY
- CAB
- Removal And Installation
- Door Removal And Installation
- Front Window Removal And Installation
- Right Side Rear Sliding Window Removal And Installation
- Right Side Front Sliding Window Removal And Installation
- Glass Removal
- Glass Installation
- Glass Installation (Cont’d)
- SEAT AND SEAT MOUNT
- RIGHT CONSOLE
- Console Cover Removal And Installation (Cab Models 320L, 320, 322 & ROPS Canopy Model 320L)
- Console Cover Removal And Installation (ROPS Canopy Models 320 & 322)
- Gas Spring Removal And Installation (ROPS Canopy Models 320 & 322)
- Lock Lever Removal And Installation (ROPS Canopy Models 320 & 322)
- Adjustment (ROPS Canopy Models 320 & 322)
- Latch Hook Removal And Installation (ROPS Canopy 320 & 322)
- Latch Hook Disassembly And Assembly (ROPS Canopy Models 320 & 322)
- Cab Models (320L, 320 & 322, And ROPS Canopy Model 320L)
- Upper Console Removal And Installation
- Console Base Removal And Installation
- LEFT CONSOLE
- Console Cover Removal And Installation
- Gas Spring Removal And Installation
- Lock Lever Removal And Installation
- Adjustment
- Latch Hook Removal And Installation
- Latch Hook Disassembly And Assembly
- Upper Console Removal And Installation
- Console Base Removal And Installation
- ENGINE SPEED CONTROL
- Removal and Installation
- Engine Speed Control Cable Removal and Installation
- BLADE CONTROL
- Removal and Installation
- Disassembly And Assembly
- RIGHT PEDAL
- Right Pedal Removal And Installation
- Disassembly And Assembly
- Linkage Removal And Installation
- Linkage Disassembly And Assembly
- LEFT PEDAL
- Removal And Installation
- Disassembly And Assembly
- TRAVEL CONTROLS
- Removal And Installation
- Disassembly And Assembly
- CONTROL LINKAGE ASSEMBLY
- Removal And Installation
- Left Pedal Linkage Disassembly And Assembly
- Right Travel Control Linkage Disassembly And Assembly
- Left Travel Control Linkage Disassembly And Assembly
- Linkage Rod Removal And Installation
- Linkage Rod Adjustment
- FLOORMAT AND FLOORPLATES
- FUEL TANK
- HORN
- SWING FRAME
- Removal And Installation
- Bushing Replacement
- Swing Frame Bushing Removal
- Swing Frame Bushing Installation
- Boom Pivot Bushing Removal And Installation
- BOOM
- Removal And Installation
- Boom Bushing Removal And Installation
- ARM
- Removal And Installation
- Arm To Boom Bushing Removal And Installation
- Arm To Bucket And Bucket Link Bushing Removal And Installation
- BUCKET
- TAILGATE
- Removal And Installation
- Latch Removal And Installation
- SWING LOCK
- BLADE EXTENSION TRAY
- LEFT PEDAL
- Not Available At Time Of Print
- ELECTRICAL SYSTEM AND ANALYSIS
- ELECTRICAL SCHEMATICS
- ELECTRICAL SYSTEM
- Troubleshooting Chart
- Description
- Fuses
- Relays And Diodes
- BATTERY
- Servicing
- Removing And Installing The Battery
- Using A Booster Battery (Jump Starting)
- ALTERNATOR
- Description
- Tests
- Alternator Output Test
- Full Field Test
- Alternator Regulator Test
- Alternator Regulator Test With Voltmeter
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- STARTER
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- Cleaning and Inspection
- LIGHTS
- Upper Structure Light Removal And Installation
- Boom Light Removal And Installation
- Boom Light Disassembly And Assembly
- Light Switch Removal And Installation
- TWO-SPEED SWITCH
- FUEL LEVEL SENDER
- Removal and Installation
- Testing
- MICROSWITCH
- Adjustment
- Testing
- Removal And Installation
- ENGINE SERVICE
- TROUBLESHOOTING
- SPARK ARRESTOR MUFFLER
- AIR CLEANER
- RADIATOR
- ENGINE COMPONENTS AND TESTING (S/N 223911001 – 223911621, S/N 224011001 – 224013374)
- Valve Clearance Adjustment
- Engine Compression Checking
- Fuel Shut-Off Solenoid Removal And Installation
- Fuel Shut-Off Timer Removal And Installation
- Fuel Injection Pump Check
- Fuel Injection Pump Removal And Installation
- Fuel Injection Pump Timing
- Fuel Injector Removal And Installation
- Fuel Injector Checking
- Glow Plug Removal And Installation
- Glow Plug Checking
- ENGINE COMPONENTS AND TESTING (S/N 223911622 & Above, S/N 224013375 & Above)
- Valve Clearance Adjustment
- Engine Compression Checking
- Fuel Shut-Off Solenoid Removal And Installation
- Fuel Shut-Off Timer Removal And Installation
- Fuel Injection Pump Check
- Fuel Injection Pump Removal And Installation
- Fuel Injection Pump Timing
- Fuel Injector Removal And Installation
- Fuel Injector Checking
- Glow Plug Removal And Installation
- ENGINE
- ENGINE FLYWHEEL
- Removal And Installation
- Hydraulic Pump Coupler
- Flywheel Ring Gear
- RECONDITIONING THE ENGINE (S/N 223911001 – 223911621, S/N 224011001 – 224013374)
- Cylinder Head Removal And Installation
- Cylinder Head Disassembly And Assembly
- Cylinder Head, Servicing
- Cylinder Head Top Clearance
- Valve Guide, Checking
- Valve And Valve Seat Reconditioning
- Valve Spring
- Rocker Arm And Shaft, Checking
- Timing Gearcase Cover Removal And Installation
- Idler Gear And Camshaft Removal And Installation
- Idler Gear and Shaft, Servicing
- Timing Gears Checking Backlash
- Fuel Camshaft Removal And Installation
- Fuel Camshaft Governor
- Crankshaft Gear Removal And Installation
- Oil Pump Removal And Installation
- Oil Pump, Service
- Engine Oil Pressure, Checking
- Relief Valve
- Piston And Connecting Rod Removal And Installation
- Piston And Connecting Rod, Servicing
- Connecting Rod Alignment
- Crankshaft And Bearings Removal And Installation
- Crankshaft And Bearings, Servicing
- Cylinder Bore, Checking
- Water Pump Removal And Installation
- Water Pump Disassembly And Assembly
- RECONDITIONING THE ENGINE (S/N 223911622 & Above, S/N 224013375 & Above)
- Cylinder Head Removal And Installation
- Cylinder Head Disassembly And Assembly
- Cylinder Head, Servicing
- Cylinder Head Top Clearance
- Valve Guide, Checking
- Valve And Valve Seat Reconditioning
- Valve Spring
- Rocker Arm And Shaft, Checking
- Timing Gearcase Cover Removal And Installation
- Idler Gear And Camshaft Removal And Installation
- Idler Gear and Shaft, Servicing
- Timing Gears Checking Backlash
- Fuel Camshaft Removal And Installation
- Fuel Camshaft Governor
- Crankshaft Gear Removal And Installation
- Oil Pump Removal And Installation
- Oil Pump, Service
- Engine Oil Pressure, Checking
- Relief Valve
- Piston And Connecting Rod Removal And Installation
- Piston And Connecting Rod, Servicing
- Connecting Rod Alignment
- Crankshaft And Bearings Removal And Installation
- Crankshaft And Bearings, Servicing
- Cylinder Bore, Checking
- Water Pump Removal And Installation
- Water Pump Disassembly And Assembly
- HEATER
- SPECIFICATIONS
- SPECIFICATIONS
- 320/322 Excavator Machine Dimensions
- Performance
- Controls
- Engine
- Hydraulic System
- Hydraulic Cylinders
- Hydraulic Cycle Times
- Drive System
- Under Carriage
- Track
- Electrical
- ENGINE SPECIFICATIONS
- Fuel Injection Nozzles
- Fuel Injection Pump
- Cylinder Head
- Valves
- Valve Springs
- Rocker Arms
- Camshaft
- Cylinders
- Piston Rings
- Pistons
- Connecting Rods
- Oil Pump
- Crankshaft
- Timing Gear
- Thermostat
- Engine Bolt Torque
- Crankshaft Re-Grind Data
- TORQUE SPECIFICATIONS
- 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
- HYDRAULIC FLUID SPECIFICATIONS
- FUEL, COOLANT AND LUBRICANTS
- CONVERSIONS
- Decimal And Millimeter Equivalents
- U.S. To Metric Conversion Chart
- SMR
- 320/322-1
- 320/322-2
- 320/322-3
- 320/322-4
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