The Bobcat 328 is a compact excavator that spends its life trenching, loading trucks, and doing tight access work where a big machine won't fit. The service manual is what I keep handy in the shop when a 328 comes in with weak hydraulics, an electrical fault, or an engine complaint. People reach for this manual when they're past basic maintenance and need teardown steps, specs, and proper test procedures. If you're trying to keep a 328 earning money instead of sitting in the yard, this is the book you want.
What this manual helps you do
- Diagnose hydraulic issues by checking pressures, flows, and relief settings on the 328's excavator-class system
- Trace and troubleshoot electrical faults using wiring diagrams, connector callouts, and test procedures
- Follow step-by-step disassembly and reassembly for components like pumps, drive motors, final drives, and cylinders
- Rebuild and set up the small diesel engine systems, including fuel, cooling, and basic mechanical work
- Adjust and verify controls, travel functions, swing, and attachment operation after repairs
Who this is for
This manual is for shop mechanics, field techs, rental yards, and owner-operators working on a Bobcat 328 within serial range 516611001 to 516699999. If you just need operating tips, safety info, or daily checks, you want the operator's handbook instead, not this service manual.
FAQ
Q: Is this a searchable PDF and are the wiring diagrams readable?
A: Yes, it's a PDF and you can search text. Wiring diagrams are laid out so you can zoom in and read pin numbers and wire colors.
Q: How do I know if it fits my 328?
A: Check your serial plate. If your 328 serial number falls between 516611001 and 516699999, this is the correct manual.
Q: Is this the right document if I'm doing full repairs, not just oil changes?
A: Yes, this is the workshop-level service manual, meant for real repair work, not routine maintenance only.
Bottom line: If you own or service a Bobcat 328 in that serial range and need real repair info, this is the right manual. If you only want how to run the machine, skip it.
📘 Show Index
Table of Contents:
- MAINTENANCE SAFETY
- ALPHABETICAL INDEX
- CONTENTS
- FOREWORD
- SAFETY INSTRUCTIONS
- SERIAL NUMBER LOCATIONS
- HYDRAULIC EXCAVATOR SERIAL NUMBER
- ENGINE SERIAL NUMBER
- DELIVERY REPORT
- HYDRAULIC EXCAVATOR IDENTIFICATION
- PREVENTIVE MAINTENANCE
- SERVICE SCHEDULE
- LIFTING AND BLOCKING THE EXCAVATOR
- TRANSPORTING THE HYDRAULIC EXCAVATOR
- ENGINE COVER
- Opening The Engine Cover
- Adjustment Of The Engine Cover Latch
- AIR CLEANER SERVICE
- Replacing The Filter Element (325 S/N 514013001–514014899)
- Replacing The Filter Element (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- FUEL SYSTEM
- Fuel Specifications
- Filling The Fuel Tank
- Fuel System Maintenance
- Fuel Filter (325 S/N 514013001–514014899)
- Fuel Filter (325 S/N 514014900 & Above) & (328 S/N516611001 & Above)
- Removing Air From The Fuel System (325 S/N514013001–514014899)
- ENGINE LUBRICATION SYSTEM
- Checking Engine Oil
- Replacement Of Oil And Filter
- COOLING SYSTEM
- Coolant Level
- Coolant Replacement
- ALTERNATOR BELT
- ELECTRICAL SYSTEM
- Using A Booster Battery (Jump Starting)
- HYDRAULIC SYSTEM
- Checking And Adding Fluid
- Replacing The Hydraulic Oil
- Replacing The Hydraulic Filter
- Replacing The Drain Line Filter
- SPARK ARRESTOR MUFFLER (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- Cleaning The Spark Arrestor Muffler
- SPARK ARRESTOR MUFFLER (325 S/N 514013001–514014899)
- Cleaning The Spark Arrestor Muffler
- TRAVEL MOTOR
- Checking The Oil Level
- Draining And Refilling
- LUBRICATION OF THE HYDRAULIC EXCAVATOR
- HEATER AIR FILTER (With Cab Option Only) (325 S/N514013001–514014899)
- HEATER AIR FILTER (With Cab Option Only) (325 S/N514014900 & Above) & (328 S/N 516611001 & Above)
- HYDRAULIC SECTION
- HYDRAULIC SCHEMATICS
- HYDRAULIC SYSTEM TROUBLESHOOTING
- HYDRAULIC SERVICE INFORMATION
- Description
- Checking The Main Relief Valves
- Testing The Swing Circuit Relief Valve
- Testing The Auxiliary And Bucket Circuit Relief Valve
- Testing The Left Hand Travel Circuit Relief Valve
- Testing The Right Hand Travel Circuit Relief Valve
- Testing The Boom Circuit Relief Valve
- CROSS PORT RELIEF VALVE
- HYDRAULIC PUMP
- Checking the Hydraulic Pump
- Removal And Installation (325 S/N 514013001–514014899)
- Parts Identification (325 S/N 514013001– 514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- Disassembly (325 S/N 514013001–514014899)
- Assembly (325 S/N 514013001–514014899)
- HYDRAULIC CONTROL VALVE (5–Spool)
- Left Travel, Right Travel, Boom, Bucket and Auxiliary
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- Left Travel, Right Travel, Boom, Bucket and Auxiliary
- Parts Identification
- Disassembly
- Outlet Sections Disassembly
- Mid Inlet Section Disassembly
- Mid Inlet Section Assembly
- Left Travel, Right Travel and Auxiliary Disassembly
- Left Travel, Right Travel and Auxiliary Assembly
- Boom And Bucket Disassembly
- Boom And Bucket Assembly
- Assembly
- PORT RELIEF VALVES AND MID INLET MAIN RELIEF VALVES
- Parts Identification
- Port Relief Valve Pressure Setting
- Disassembly
- Assembly
- MAIN RELIEF VALVES (Adjustable)
- Parts Identification
- Pressure Settings
- Disassembly
- Assembly
- Adjusting The Main Relief Valves
- HYDRAULIC CONTROL VALVE (5–Spool)
- Boost, Arm, Boom Swing, Blade And Swing Section
- Description
- Removal And Installation
- Parts Identification
- Disassembly
- Inlet Section Disassembly
- Inlet Section Assembly
- Arm, Boost And Swing Motor Disassembly
- Arm, Boost And Swing Motor Assembly
- Boom Swing Disassembly
- Boom Swing Assembly
- Blade Disassembly
- Blade Assembly
- Assembly
- ACCUMULATOR
- Removal And Installation
- Parts Identification (S/N 514013001 – 514017331& 516611001 – 516611918)
- Disassembly (S/N 514013001 – 514017331& 516611001 – 516611918)
- Assembly
- Parts Identification (S/N 514017312 & Above &516611919 & Above)
- Disassembly (S/N 514017312 & Above &516611919 & Above)
- Assembly (S/N 514017312 & Above &516611919 & Above)
- Testing (All Models)
- PORT BLOCK
- BUILD UP VALVE
- Description
- Removal And Installation
- Disassembly And Assembly
- AUXILIARY SELECTOR VALVE
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- Disassembly And Assembly
- OIL COOLER
- HYDRAULIC RESERVOIR
- HYDRAULIC FILTER ASSEMBLY
- CASE DRAIN FILTER
- BOOM CYLINDER SHIELD
- BOOM CYLINDER
- BOOM CYLINDER
- ARM CYLINDER
- Removal And Installation
- Parts Identification
- BUCKET CYLINDER
- Removal And Installation
- Parts Identification
- BLADE CYLINDER
- Removal And Installation
- Parts Identification
- BOOM SWING CYLINDER
- Removal And Installation
- Parts Identification
- HYDRAULIC CYLINDER
- JOYSTICK CONTROL CHANGE
- ISO to STANDARD Control Pattern
- STANDARD To ISO Control Pattern
- DRIVE SECTION
- RIGHT CONSOLE COVER (325 S/N 514013001–514014899)
- RIGHT CONSOLE
- Speed Control Lever Removal And Installation
- Speed Control Lever Adjustment
- Low Speed Position
- High Speed Position
- Blade Control Lever And Cable Removal And Installation
- LEFT CONSOLE (325 S/N 514013001–514014899)
- Control Lock Micro–Switch Removal And Installation
- Gas Spring Removal And Installation
- Removal And Installation
- Lock Lever Removal And Installation
- Lock Lever Disassembly And Assembly
- Lock Lever Adjustment
- Latch Plate Adjustment
- RIGHT CONSOLE COVER (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- Removal And Installation
- Arm Rest Removal And Installation
- Gauge Removal And Installation
- RIGHT CONSOLE (325 S/N 514014900 & Above) &(328 S/N 516611001 & Above)
- Swing Lock Lever Removal And Installation
- Blade Lever Removal And Installation
- Speed Control Lever Removal And Installation
- Speed Control Lever Adjustment
- Low Speed Position
- High Speed Position
- LEFT CONSOLE COVER (325 S/N 514014900 & Above) & (328 S/N 516611001 & Above)
- Removal And Installation
- Arm Rest Removal And Installation
- Switch Removal And Installation
- Switch Description
- Rear Cover Removal And Installation
- LEFT CONSOLE (325 S/N 514014900 & Above) & (328 S/N 516611001 & Above
- Console And Mount Removal And Installation
- Control Lock Micro–switch Removal And Installation
- Lock Lever Removal And Installation
- Gas Spring Removal And Installation
- Console Removal And Installation
- JOYSTICK
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation Of Right Hand Joystick(325 S/N 514014900 & Above) & (328 S/N 516611001 & Above)
- Removal And Installation Of Left Hand Joystick (325S/N 514014900 & Above) & (328 S/N 516611001 & Above)
- Troubleshooting
- Parts Identification
- Disassembly
- Assembly
- STEERING LEVERS AND PEDALS
- UPPER WORKS AND SWING SECTION
- REAR ENGINE COVER
- SEAT AND SEAT MOUNT
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- FLOOR MAT AND FLOOR PLATE
- REAR FLOOR PLATE
- Removal And Installation (325 S/N 514013001–514014899)
- SWING MOTOR COVER
- TOOL BOX
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- LEFT SIDE COVER
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- RIGHT SIDE COVER
- CORNER POST
- COUNTERWEIGHTS
- FRONT ENGINE COVER
- FUEL TANK
- BUCKET
- ARM
- ARM BUSHINGS
- Arm To Boom Bushing Removal And Installation
- Arm To Bucket And Bucket Link Bushing RemovalAnd Installation
- BOOM
- BOOM BUSHING
- BOOM SWING BRACKET
- Removal
- Installation
- Hose Installation
- SWING BRACKET BUSHING
- Bushing Removal
- Bushing Installation
- SWING MOTOR
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- CROSS PORT RELIEF VALVE
- SWING MOTOR DRIVE CARRIER
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- UPPERSTRUCTURE AND SWING CIRCLE GEAR
- Removal And Installation
- Swing Bearing Removal
- Swing Bearing Installation
- Alignment Pins (Not Threaded)
- CENTER SWIVEL JOINT
- Removal And Installation
- Removal And Installation (Through Bottom AccessCover)
- Parts Identification
- Description
- Disassembly
- Assembly
- ROPS CANOPY
- CAB
- Removal And Installation
- Heater Removal And Installation (325 S/N514013001– 514014899)
- Heater Removal And Installation (325 S/N 514014900& Above) & (328 S/N 516611001 & Above)
- Heater Disassembly And Assembly (325 S/N514014900 & Above) & (328 S/N 516611001 & Above)
- Front Window Removal And Installation
- Front Lower Window Removal And Installation
- Front Upper Window Removal And Installation (325S/N 514013001–514014899)
- Front Upper Window Removal And Installation (325S/N 514014900 & Above) & (328 S/N 516611001 &Above)
- Door Window Removal And Installation
- Left Hand Side Window Removal And Installation
- Right Hand Side Window Removal And Installation
- Right Hand Window Assembly Removal AndInstallation
- Rear Window Removal And Installation
- CAB/CANOPY REAR COVER
- MAIN FRAME AND TRACKS
- BLADE
- TRACK
- Track Lug Height
- Track Tension Adjustment
- Rubber Track Clearance
- Steel Track Clearance
- Adjustment
- Rubber Track Removal And Installation
- Steel Track Removal And Installation
- Disassembly And Assembly
- Recoil Spring Disassembly And Assembly
- TRACK IDLER
- Parts Identification
- Disassembly
- Assembly
- TRACK ROLLER
- Parts Identification
- Disassembly
- Assembly
- TRAVEL MOTOR
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- TRACK DAMAGE IDENTIFICATION
- Cutting Of Steel Cords
- Abrasion Of Embedded Metals
- Separation Of Embedded Metals
- Separation Of Embedded Metals Due To Corrosion
- Cuts On The Lug Side Rubber
- Cracks Of 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 Track Roller Side
- ELECTRICAL SYSTEM
- ELECTRICAL SCHEMATICS
- TROUBLESHOOTING
- ELECTRICAL SYSTEM
- Description
- Fuses (325 S/N 514013001–514014899)
- Fuse Arrangement (325 S/N 514013001–514014899)
- Electrical Relays And Diodes (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- Fuse Arrangement (325 S/N 514014900 & Above) &(328 S/N 516611001 & Above)
- BATTERY
- Removal And Installation
- Servicing The Battery
- ALTERNATOR
- Belt Adjustment
- Removal And Installation
- ALTERNATOR
- Alternator Output Test
- Rectifier (Diode) Test
- Alternator Regulator Test
- Parts Identification
- Disassembly And Inspection
- Stator Continuity Test
- Stator Ground Test
- Rotor Continuity Test
- Rotor Ground Test
- Rectifier Continuity (Diode) Test
- Assembly
- STARTER
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- Disassembly And Assembly
- Cleaning And Inspection (325 S/N 514013001–514014899)
- Parts Identification (325 S/N 514013001– 514014899)
- Parts Identification (325 S/N 514014900 & Above) & (328 S/N 516611001 & Above)
- Disassembly (325 S/N 514014900 & Above) & (328 S/N516611001 & Above)
- Inspection And Repair (325 S/N 514014900 & Above)& (328 S/N 516611001 & Above)
- Assembly (325 S/N 514014900 & Above) & (328 S/N516611001 & Above)
- FUEL LEVEL SENDER
- Removal And Installation
- Testing
- INSTRUMENT PANEL (325 S/N 514013001–514014899)
- GAUGES
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- Bulb Replacement (325 S/N 514014900 & Above) &(328 S/N 516611001 & Above)
- TIMER (325 S/N 514014900 & Above) & (328 S/N516611001 & Above)
- DIODES (325 S/N 514014900 & Above) & (328 S/N516611001 & Above)
- Diode Location
- Diode Replacement
- Diode Testing
- CAB ELECTRICAL
- Cab Option (325 S/N 514013001–514014899)
- Cab Option (325 S/N 514014900 & Above) & (328 S/N516611001 & Above)
- HORN
- BUZZER
- TWO SPEED SWITCH
- ENGINE SYSTEM
- TROUBLESHOOTING
- VALVE CLEARANCE
- ENGINE COMPRESSION
- FUEL SHUTOFF SOLENOID
- Adjustment
- Removal And Installation
- Timer Module 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
- FAN GUARD
- RADIATOR
- MUFFLER
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- AIR CLEANER
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- ENGINE
- ENGINE FLYWHEEL
- Removal And Installation (325 S/N 514013001–514014899)
- Removal And Installation (325 S/N 514014900 &Above) & (328 S/N 516611001 & Above)
- FLYWHEEL RING GEAR
- CYLINDER HEAD
- Removal And Installation
- Disassembly And Assembly Of The Cylinder Head
- Servicing The Cylinder Head
- Top Clearance
- VALVE, VALVE SEAT AND GUIDE
- Checking The Valve Guide
- Reconditioning The Valve And Valve Seat
- Valve Spring
- ROCKER ARM AND SHAFT
- TIMING GEARCASE COVER
- IDLER GEAR AND CAMSHAFT
- Removal And Installation
- Servicing The Idler Gear And Shaft
- TIMING GEARS
- FUEL CAMSHAFT
- Removal And Installation
- Governor
- CRANKSHAFT GEAR
- OIL PUMP
- Removal And Installation
- Oil Pump Service
- Checking Engine Oil Pressure
- Relief Valve
- PISTON AND CONNECTING ROD
- Removal And Installation
- Servicing The Piston And Connecting Rod
- Connecting Rod Alignment
- CRANKSHAFT AND BEARINGS
- Removal And Installation
- Servicing The Crankshaft And Bearings
- CYLINDER BORE
- Checking The Cylinder Bore
- WATER PUMP
- SPECIFICATIONS
- HYDRAULIC EXCAVATOR SPECIFICATIONS (325 S/N 514013001–514014899)
- Machine Dimensions
- Lifting Capacity
- WEIGHTS
- CONTROLS
- ENGINE
- ELECTRICAL
- HYDRAULIC SYSTEM
- SWING SYSTEM
- HYDRAULIC CYLINDERS
- DRIVE SYSTEM
- BRAKES
- UNDERCARRIAGE
- STD TRACK
- CAPACITIES
- DIGGING FORCE
- HYDRAULIC EXCAVATOR SPECIFICATIONS (325 S/N 514014900 & Above) & (328 S/N 516611001 & Above
- Machine Dimensions
- Lifting Capacity
- WEIGHTS
- CONTROLS
- ENGINE
- ELECTRICAL
- HYDRAULIC SYSTEM
- SWING SYSTEM
- HYDRAULIC CYLINDERS
- DRIVE SYSTEM
- BRAKES
- UNDERCARRIAGE
- STD TRACK
- CAPACITIES
- DIGGING FORCE
- ENGINE SPECIFICATIONS
- Fuel Injection Nozzles
- Fuel Injection Pump
- Cylinder Head
- Valves
- Valve Springs
- Valve Timing
- Rocker Arms
- Camshaft
- Tappet
- Cylinders
- Piston Rings
- Pistons
- Connecting Rod
- Oil Pump
- Crankshaft
- Timing Gear
- Thermostat
- Engine Bolt Torque
- Re–Grinding The Crankshaft
- TORQUE FOR GENERAL METRIC BOLTS
- FUEL, COOLANT AND LUBRICANTS
- ENGINE OIL AND COOLING SPECIFICATIONS
- Description
- Anti–Freeze Solution
- Propylene Glycol
- BUCKET SPECIFICATIONS
- DECIMAL AND MILLIMETER EQUIVALENTS
- U.S. TO METRIC CONVERSION
- SERVICE MANUAL REVISON
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