The Bobcat 337 is a mid-size compact excavator that spends its days trenching, loading trucks, and doing utility work in tight spots. When something quits, the service manual is what the shop mechanic, field tech, or owner-operator grabs to get hard data and step-by-step procedures. They're usually chasing a hydraulic issue, an electrical fault, or doing scheduled tear-downs at higher hour marks.
What this manual helps you do
- Diagnose hydraulic problems by following test procedures and using the correct pressure and flow check points
- Trace and repair electrical faults using wiring diagrams and connector callouts
- Rebuild and reseal major components like swing motors, cylinders, and drive motors with proper disassembly and reassembly order
- Check and set engine-related items, then verify adjustments after repair work
- Replace undercarriage and structural parts with the right removal, install, and torque sequences
Who this is for
This manual is for anyone maintaining or repairing a Bobcat 337 excavator in the serial range 234611001 through 234699999, including small contractors, rental fleets, and shop or field techs. If you just need basic controls, safety, 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 manuals are normally supplied as searchable PDFs and the wiring diagrams are designed to be zoomed in on a screen.
Q: How do I know if it fits my exact 337?
A: Check your machine's serial plate. If the serial number falls between 234611001 and 234699999, this is the right service manual.
Q: Is this what I need for full repairs, or is it just a basic guide?
A: This is the workshop-level service manual, meant for real repairs and diagnostics, not just basic operation.
Bottom line: If your 337's serial number is in that range and you're doing your own repairs or diagnostics, this is the manual you want.
📘 Show Index
Table of Contents:
- MAINTENANCE SAFETY
- CONTENTS
- FOREWORD
- FOREWORD
- SAFETY INSTRUCTIONS
- FIRE PREVENTION
- Maintenance
- Operation
- Electrical
- Hydraulic System
- Fueling
- Starting
- Spark Arrester Exhaust System
- Welding And Grinding
- Fire Extinguishers
- SERIAL NUMBER LOCATIONS
- Excavator Serial Number
- Engine Serial Number
- DELIVERY REPORT
- BOBCAT EXCAVATOR IDENTIFICATION
- SAFETY & MAINTENANCE
- LIFTING AND BLOCKING THE EXCAVATOR
- LIFTING THE EXCAVATOR
- OPERATOR CAB (ROPS / TOPS)
- TRANSPORTING THE EXCAVATOR
- Loading And Unloading
- Fastening
- TAILGATE
- Opening And Closing The Tailgate
- Adjusting The Bumper
- Adjusting The Latch
- RIGHT SIDE COVER
- Opening And Closing The Right Side Cover
- SERVICE SCHEDULE
- AIR CLEANER
- Checking
- Replacing The Filters
- HEATER AIR FILTER
- 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
- Draining The Fuel Tank
- Fuel Filter
- 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
- Replacing The Hydraulic Oil
- Replacing The Hydraulic Filter
- Replacing The Case Drain Filter
- Diagnostic Couplers
- LUBRICATION OF THE EXCAVATOR
- TRAVEL MOTOR
- Checking Oil Level
- Draining The Travel Motor
- SPARK ARRESTER MUFFLER
- ENGINE ACCESSORY DRIVE BELT
- Belt Tension
- Belt Adjustment
- SEAT BELT
- Inspection And Maintenance
- REMOTE START TOOL KIT – MEL1563
- Remote Start Tool – MEL1563
- Service Tool Harness Communicator – MEL1566
- REMOTE START TOOL (SERVICE TOOL) KIT – 7003031
- Description
- Remote Start Tool (Service Tool) – 7003030
- Excavator Service Tool Harness – 6689747
- Computer Service Tool Harness – 6689746
- 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 Upperstructure Slew Circuit
- Troubleshooting The Travel Circuit
- Description
- 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
- CLAMP CYLINDER
- Testing
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- MAIN RELIEF VALVE
- PORT RELIEF VALVES
- Port Relief Valve Pressure Setting
- Parts Identification
- Adjustment Procedure
- CROSSPORT RELIEF VALVE
- Testing And Adjusting The Crossport Relief Valve
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- PRESSURE REDUCING VALVE
- HYDRAULIC CONTROL VALVE
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- Slew Valve Section
- Boom Swing Valve Section
- Blade Valve Section (S/N 234611001-234611163 And S/N 234711001-234711197)
- Blade Valve Section (S/N 234611164 & Above And 234711198 & Above)
- Bucket Valve Section
- Arm Valve Section
- Boom Valve Section
- Auxiliary Valve Section
- Right Travel Valve Section
- Left Travel Valve Section
- Inlet Section
- HYDRAULIC PUMP (S/N 234611001 – 234613190, 234613193 – 234613247, 234711001 – 234713440)
- Hydraulic Pump Work Sheet
- Pump Testing
- Removal And Installation
- Coupler Removal And Installation
- Hydraulic Pump Start Up
- Torque Limiter Valve Parts Identification
- Torque Limiter Valve Removal
- Torque Limiter Valve Disassembly
- Torque Limiter Valve Assembly
- Initial Torque Limiter Valve Setting
- Torque Limiter Valve Installation
- Pump Control Parts Identification
- Pump Control Removal And Installation
- Pump Control Disassembly And Assembly
- Parts Identification
- Disassembly
- Assembly
- HYDRAULIC PUMP (S/N 234613191, 234613192, 234613248 & ABOVE, 2347133441 & ABOVE)
- Hydraulic Pump Work Sheet
- Pump Testing
- Removal And Installation
- Coupler Removal And Installation
- Hydraulic Pump Start Up
- Torque Limiter Assembly Parts Identification
- Torque Limiter Valve Assembly Removal And Installation
- Torque Limiter Valve Assembly Disassembly And Assembly
- Pump Control Parts Identification
- Pump Control Removal And Installation
- Pump Control Disassembly And Assembly
- Parts Identification
- Disassembly And Assembly
- MANIFOLD ASSEMBLY / ACCUMULATOR
- Description
- Testing Pilot Pressure
- Adjusting The Pilot Pressure
- Removal And Installation
- Manifold Assembly / Accumulator Parts Identification
- Disassembly And Assembly
- TRAVEL MOTOR
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- SWIVEL JOINT
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- SWING MOTOR
- Removal And Installation
- Parts Identification
- Disassembly
- Inspection
- Assembly
- SWING MOTOR DRIVE CARRIER
- Removal And Installation
- Parts Identification
- Checking The Drive Carrier Shaft End Play
- Disassembly
- Inspection
- Assembly
- CONTROL PATTERN SELECTOR VALVE
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- RIGHT CONTROL LEVER (JOYSTICK)
- Testing
- Handle Removal And Installation
- Joystick Assembly Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- LEFT CONTROL LEVER (JOYSTICK)
- Testing
- Handle Removal And Installation
- Joystick Assembly Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- TRAVEL CONTROL VALVE
- Removal and Installation
- Parts Identification
- Disassembly And Assembly
- HYDRAULIC FILTER MOUNT
- HYDRAULIC RESERVOIR
- OIL COOLER
- DUAL SEQUENCE VALVE
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- DIRECT TO TANK VALVE
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- BUILD UP VALVE
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- CASE DRAIN FILTER MOUNT
- REMOVING AIR FROM HYDRAULIC SYSTEM
- BOOM SWING LOCK VALVE
- Description
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- HYDRAULIC X-CHANGE VALVE
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- UNDERCARRIAGE
- BLADE
- TRACKS
- Track Lug Height
- Rubber Track Clearance
- Rubber Track Adjustment
- Steel Track Clearance
- Steel Track Adjustment
- Rubber Track Removal And Installation
- Steel Track Removal
- Steel Track Installation
- Track Shoe Removal And Installation
- TRACK FRAME (S/N 234611163 & BELOW AND 234711197 & BELOW)
- Disassembly And Assembly
- Recoil Spring Cylinder Disassembly And Assembly (W/O Replaceable Shaft).
- Recoil Spring Cylinder Parts Identification (With Replaceable Shaft)
- Recoil Spring Cylinder Disassembly And Assembly (With Replaceable Shaft)
- TRACK FRAME (S/N 234611164 & ABOVE AND 234711198 & ABOVE)
- Disassembly And Assembly
- Recoil Spring Cylinder Disassembly And Assembly (W/O Replaceable Shaft)
- Recoil Spring Cylinder Parts Identification (With Replaceable Shaft)
- Recoil Spring Cylinder Disassembly And Assembly (With Replaceable Shaft)
- 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 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 Track Roller Side
- TRACK IDLER (S/N 234611163 & BELOW AND 234711197 & BELOW)
- Parts Identification
- Disassembly
- Assembly
- TRACK IDLER (S/N 234611164 & ABOVE AND 234711198 & ABOVE)
- Parts Identification
- Disassembly
- Assembly
- TRACK ROLLER (S/N 234611163 & BELOW AND 234711197 & BELOW)
- Parts Identification
- Disassembly
- Assembly
- TRACK ROLLER (S/N 234611164 & ABOVE AND 234711198 & ABOVE)
- Parts Identification (Upper Roller)
- Disassembly (Upper Roller)
- Assembly (Upper Roller)
- Parts Identification (Lower Roller)
- Disassembly (Lower Roller)
- Assembly (Lower Roller)
- SWING CIRCLE GEAR (S/N 234611163 & BELOW AND 234711197 & BELOW)
- Swing Bearing Removal
- Swing Bearing Installation
- SWING CIRCLE GEAR (S/N 234611164 & ABOVE AND 234711198 & ABOVE)
- Swing Bearing Removal
- Swing Bearing Installation
- UPPERSTRUCTURE AND 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
- Right Side Front And Rear Sliding Window Weather Strip Removal And Installation
- Right Side Front And Rear Sliding Window Wiper Strip Removal And Installation
- Glass Removal
- Glass Installation
- SEAT AND SEAT MOUNT
- RIGHT CONSOLE
- Console Cover Removal And Installation
- Console Base Removal And Installation
- LEFT CONSOLE
- Lower Console Cover Removal And Installation
- Upper Console Cover Removal And Installation
- Compression Spring Removal And Installation
- Compression Spring Disassembly And Assembly
- Lock Lever Removal And Installation
- Console Removal And Installation
- Disassembly And Assembly
- Console Switch Removal And Installation
- Console Base Removal And Installation
- ENGINE SPEED CONTROL
- Removal And Installation
- Adjustment (Later Models)
- BLADE CONTROL
- Lever Removal And Installation
- Linkage Removal And Installation
- Linkage Disassembly And Assembly
- Linkage Bar Removal And Installation
- Lower Linkage Removal And Installation
- Lower Linkage Disassembly And Assembly
- RIGHT PEDAL AND LINKAGE
- Pedal Removal And Installation
- Pedal Disassembly And Assembly
- Lower Linkage Removal And Installation
- Lower Linkage Disassembly And Assembly
- Bellcrank Removal And Installation
- TRAVEL CONTROLS
- Removal And Installation
- Disassembly And Assembly
- Adjustment
- CONTROL LINKAGE ASSEMBLY
- FLOOR MAT AND FLOOR PLATE
- FUEL TANK
- HORN
- SWING FRAME
- Boom Swing Bracket Removal And Installation
- Boom Swing Bracket Hose Installation
- Swing Bracket Bushing Removal
- Swing Bracket Bushing Installation
- Boom Pivot Pin Bushing Removal
- Boom Pivot Pin Bushing Installation
- BOOM
- Removal And Installation
- Boom Pivot Pin Bushing Removal And Installation
- ARM
- BUCKET
- Bucket Teeth Removal And Installation
- CLAMP
- TAILGATE
- Removal And Installation
- Latch Removal And Installation
- Striker Removal And Installation
- X-CHANGE
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- Check Proper Latch Engagement
- X-CHANGE (PIN ON)
- Removal And Installation
- Parts Identification
- Disassembly And Assembly
- X-CHANGE (HYDRAULIC)
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- QUICK COUPLER (KLAC™ SYSTEM)
- Troubleshooting
- Daily Inspection
- Removal And Installation
- Parts Identification
- Disassembly
- Assembly
- QUICK COUPLER (LEHNHOFF® SYSTEM)
- Troubleshooting
- Daily Inspection
- Removal (MS03 And MS08)
- Installation (MS03 And MS08)
- Parts Identification (MS03)
- Disassembly And Assembly (MS03)
- Parts Identification (MS08)
- Disassembly (MS08)
- Assembly (MS08)
- ELECTRICAL SYSTEM & ANALYSIS
- ELECTRICAL SCHEMATICS
- ELECTRICAL SYSTEM INFORMATION
- Troubleshooting Chart
- Description
- Fuse And Relay Location
- BATTERY
- Servicing
- Removing And Installing The Battery
- Using A Booster Battery (Jump Starting)
- ALTERNATOR
- Engine Accessory Drive Belt
- Removal And Installation
- Alternator Identification
- Charging System Check
- Alternator Voltage Test
- Low Voltage Test
- High Voltage Test
- Rectifier Continuity (Diode) Test
- Alternator Regulator Test
- Parts Identification
- Disassembly
- Stator Continuity Test
- Stator Ground Test
- Rotor Continuity Test
- Rotor Ground Test
- Assembly
- STARTER
- Removal And Installation
- Parts Identification
- Disassembly
- Inspection And Repair
- Assembly
- LIGHTS
- Removal And Installation
- Disassembly And Assembly
- TWO-SPEED SWITCH
- FUEL LEVEL SENDER
- Removal And Installation
- Testing And Inspection
- DIAGNOSTICS SERVICE CODE
- DELUXE INSTRUMENT PANEL SETUP
- Passwords
- Password Entry (For Starting And Operating The Machine)
- Changing The Owner or Operator Password
- Password Lockout Feature
- Job Clock
- RPM
- ENGINE SERVICE
- TROUBLESHOOTING
- MUFFLER
- AIR CLEANER
- RADIATOR
- ENGINE COMPONENTS AND TESTING
- Engine Compression Checking
- Glow Plugs Removal And Installation
- Checking The Glow Plug
- Fuel Shut-off Solenoid Removal And Installation
- Fuel Injection Pump Check
- Fuel Injection Pump Removal And Installation
- Fuel Injection Pump Timing
- Fuel Injector Nozzles Removal And Installation
- Fuel Injector Nozzle Check
- Valve Clearance Adjustment
- ENGINE
- ENGINE FLYWHEEL (EARLY MODELS)
- Flywheel Removal And Installation
- Hydraulic Pump Coupler
- Flywheel Ring Gear
- ENGINE FLYWHEEL (LATER MODELS)
- Flywheel Removal And Installation
- Hydraulic Pump Coupler
- Flywheel Ring Gear
- RECONDITIONING THE ENGINE
- Cylinder Head Removal And Installation
- Cylinder Head Disassembly And Assembly
- Cylinder Head Servicing
- Cylinder Head Top Clearance
- Valve Guide Checking
- Reconditioning The Valve And Valve Seat
- Valve Spring
- Rocker Arm And Shaft Checking
- Timing Gearcase Cover Removal And Installation
- Idler Gear And Camshaft Removal And Installation
- Camshaft Servicing
- 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
- Checking Engine Oil Pressure
- Valve Tappets
- 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
- Fan Removal And Installation
- HEATING, VENTILATION & AIR CONDITIONING
- HEATER COIL (EARLY MODELS)
- Removal And Installation With A/C
- Removal And Installation Without A/C
- HEATER COIL (LATER MODELS)
- Removal And Installation With A/C
- Removal And Installation Without A/C
- BLOWER FAN (EARLY MODELS)
- Removal And Installation
- Disassembly And Assembly
- BLOWER FAN (LATER MODELS)
- Removal And Installation
- Disassembly And Assembly
- Resistor Removal And Installation
- HEATER VALVE (EARLY MODELS)
- HEATER VALVE (LATER MODELS)
- AIR CONDITIONING SYSTEM FLOW
- COMPONENTS
- SAFETY
- REGULAR MAINTENANCE
- Heater Air Filter
- Engine Accessory Drive Belt Inspection
- Cleaning The Condenser
- BASIC TROUBLESHOOTING (EARLY MODELS)
- Poor A/C Performance
- Cleaning The A/C Evaporator Coil And Heater Coil
- Engine Accessory Drive Belt Inspection
- Checking The Electrical System
- Engine Coolant Bypassing The Heater Valve
- BASIC TROUBLESHOOTING (LATER MODELS)
- Poor A/C Performance
- Cleaning The A/C Evaporator Coil And Heater Coil
- Engine Accessory Drive Belt Inspection
- Checking The Electrical System
- Engine Coolant Bypassing The Heater Valve
- GENERAL AIR CONDITIONING SERVICE GUIDELINES
- Compressor Oil
- Compressor Oil Check
- Component Replacement And Refrigeration Leaks
- SYSTEM TROUBLESHOOTING CHART
- Blower Motor Does Not Operate
- Gauge Pressure Related Troubleshooting
- TEMPERATURE / PRESSURE
- AIR CONDITIONING SERVICE
- SYSTEM CHARGING AND RECLAMATION
- Reclamation Procedure
- Charging Procedure With A Manifold Gauge Set
- COMPRESSOR
- Removal And Installation
- Compressor Clutch Disassembly And Assembly
- CONDENSER
- RECEIVER / DRIER
- PRESSURE RELIEF VALVE
- PRESSURE SWITCH
- EVAPORATOR / HEATER UNIT (EARLY MODELS)
- Removal And Installation
- Disassembly And Assembly
- EVAPORATOR / HEATER UNIT (LATER MODELS)
- Removal And Installation
- Disassembly And Assembly
- THERMOSTAT (EARLY MODELS)
- THERMOSTAT (LATER MODELS)
- EXPANSION VALVE (EARLY MODELS)
- EVAPORATOR VALVE (LATER MODELS)
- EVAPORATOR (EARLY MODELS)
- EVAPORATOR (LATER MODELS)
- SPECIFICATIONS
- (337, 341) EXCAVATOR SPECIFICATIONS
- 337 Dimensions
- 337 With Long Arm And 341 Dimensions
- Performance
- Controls
- Engine
- Hydraulic System
- Hydraulic Cylinders
- Hydraulic Cycle Times
- Electrical
- Instrumentation
- Drive System
- Slew System
- Undercarriage
- Crawler Track Design
- Capacities
- Fuel Tank
- Track
- Type
- Ground Pressure
- ENGINE SPECIFICATIONS
- Specifications
- 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 Chart
- U.S. To Metric Conversion Chart
- ALPHABETICAL INDEX
- SERVICE MANUAL REVISION
- Revision No: 337 / 341 – 1
- Revision No: 337/341 – 2
- Revision No: 337/341 – 3
- Revision No: 337/341 – 4
- Revision No: 337/341 – 5
- Revision No: 337/341 – 6
- Revision No: 337/341 – 7
- Revision No: 337/341 – 8
- Revision No: 337/341 – 9
- Revision No: 337/341 – 10
- Revision No: 337/341 – 11
- Revision No: 337/341 – 12
- Revision No: 337, 341 – 13
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