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Bobcat 943 Loader Service Manual (SN 503312001-503399999)

Format: PDF (Printable Document)

File Language: English

File Pages: 372

File Size: 12.70 MB (Speed Download Link)

Brand: Bobcat

Model: 943 Loader

Book No: 6570008

Serial No: SN 503312001-503399999

Type of Document: Service Manual

Categories: ,

$ 45

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Bobcat 943 Loader Service Manual (SN 503312001-503399999)

A Bobcat 943 is an older skid-steer-class loader that spends its life loading trucks, feeding mixers, and doing pallet work in tight yards. The service manual is what you grab when the machine is down and you actually have to open housings, test hydraulic circuits, or chase an electrical fault, the same way we do with Cat or Deere books in the shop. People buying this are usually past warranty and want to stop guessing and start following proper specs and procedures. If you're trying to keep a 943 alive without throwing random parts at it, this is the right level of detail.

What this manual helps you do

  • Diagnose weak drive or loader functions by checking hydrostatic and hydraulic pressures against factory specs
  • Trace electrical issues using readable wiring diagrams and step-by-step test procedures
  • Follow teardown and reassembly steps for pumps, motors, cylinders, and major mechanical components
  • Adjust linkages, controls, and safety interlocks so the machine responds correctly and passes safety checks
  • Replace and set up engine and drivetrain components with the right sequences and torque references

Who this is for

This manual is for anyone working on a Bobcat 943 within serial range 503312001 to 503399999: small contractors, farm shops, field techs, rental fleets, and owner-operators. If you just want to learn how to run the loader or daily grease points, you want the operator's handbook instead, not this.

FAQ

Q: Is this a searchable PDF and are the wiring diagrams readable?

A: Yes, these manuals are usually scanned or native PDFs you can search, and the wiring pages are clear enough to zoom and follow wire colors and pin numbers.

Q: Does this cover my exact 943?

A: If your serial number falls between 503312001 and 503399999, this is the correct service manual. If it's outside that range, you need a different book.

Q: Is this the right book if I'm only doing filters and basic maintenance?

A: It will work, but it's overkill. For simple service intervals and fluid types, the operator's handbook is easier to use.

Bottom line: If you own or service a 943 in that serial range and need real repair info, this is the right manual. If your serial is different, skip it and look for the matching book.

📘 Show Index

Table of Contents:

  • MAINTENANCE SAFETY
  • CONTENTS
    • FOREWORD
    • SERIAL NUMBER LOCATIONS
    • LOADER SERIAL NUMBER
    • ENGINE SERIAL NUMBER
    • DELIVERY REPORT
    • BOBCAT LOADER IDENTIFICATION
  • PREVENTIVE MAINTENANCE
    • SERVICE SCHEDULE
    • LIFTING AND BLOCKING THE BOBCAT LOADER
      • Procedure
    • TRANSPORTING THE BOBCAT LOADER
      • Procedure
    • TOW VALVES
      • Procedure
    • LIFT ARM SUPPORT DEVICE
      • Installing The Lift Arm Support Device
    • OPERATOR CAB
      • Raising The Operator Cab
      • Lowering The Operator Cab
      • Operator Cab Air Seals (S/N 11999 & Below)
      • Cleaning Rear Window, Optional Front Door And Enclosure
    • SEAT BAR SYSTEM
      • Description
      • Inspection Of The Seat Bar System
      • Servicing The Seat Bar System
    • REAR DOOR
      • Opening Rear Door
      • Adjusting The Door Latch
    • REAR GRILL
      • Opening The Rear Grill
    • AIR CLEANER
      • Replacement Of The Air Cleaner Element
    • FUEL SYSTEM
      • Filling The Fuel Tank
      • Removing Water From The Fuel Filter
    • ENGINE OIL AND FILTER
      • Replacement Of Engine Oil And Filter
    • COOLING SYSTEM
      • Checking Coolant Level
      • Removing The Coolant From The Cooling System
    • ELECTRICAL SYSTEM
      • Description
      • Using An Extra Battery (Jump Start)
      • Electrical System Maintenance
    • COLD TEMPERATURE STARTING
      • Starting Procedure
    • HYDRAULIC AND HYDROSTATIC SYSTEM
      • Checking And Adding Fluid
      • Replacing The Hydraulic/Hydrostatic Filters
    • SPARK ARRESTOR MUFFLER
      • Cleaning The Spark Arrestor Muffler
      • Cleaning Exhaust Purifier
    • FINAL DRIVE CHAINCASE
    • TIRE INSPECTION AND ROTATION
      • Procedure
      • Tire Pressure
      • Wheel Nuts
    • LOADER LUBRICATION
      • Lubricating The Loader
    • PIVOT PINS
      • Checking Pivot Pin Retainer Bolts
    • STEERING CONTROL LIMITER
      • Lubricating The Steering Control Limiter
    • REMOTE START SWITCH
      • Procedure
  • HYDRAULIC SYSTEM
    • HYDRAULIC / HYDROSTATIC SCHEMATICS
    • TROUBLESHOOTING
    • HYDRAULIC SYSTEM INFORMATION
      • Flare Connections
      • O–ring Face Seal Connection
      • Straight Thread O–ring Fitting
      • Tubelines And Hoses
    • LIFT CYLINDER
      • Checking The Lift Cylinder(s)
      • Removal And Installation
      • Installation
    • TILT CYLINDER
      • Checking The Tilt Cylinder(s)
      • Removal And Installation
      • Tilt Cylinder Base End Pivot Pin
    • HYDRAULIC CYLINDER REPAIR
      • Disassembly
      • Assembly
      • Base And Rod End Seals
    • JUNCTION PORT BLOCK
      • Removal And Installation
    • QUICK COUPLERS (BRUNING)
      • Disassembly And Assembly
    • HYDRAULIC CONTROL VALVE
      • Removal And Installation
      • Disassembly And Assembly
      • Valve Spool Linkage End O–ring (All Valve Sections) Disassembly And Assembly
      • Lift Section Detent And Spool
      • Front Auxiliary Detent
      • Tilt And Rear Auxiliary Centering Spring
      • Anti–Cavitation Valve
      • Port Relief
    • CHARGE PUMP
      • Removal And Installation
      • Disassembly And Assembly
    • PRE–CHARGE PORT BLOCK (S/N 11999 & Below)
      • Removal And Installation
      • Disassembly And Assembly
    • HYDRAULIC PUMP
      • Removal And Installation
      • Disassembly And Assembly
      • Inspection
    • FAN PORT BLOCK (S/N 11999 & Below)
      • Removal And Installation
      • Disassembly And Assembly
    • FAN MOTOR (S/N 11999 & Below)
      • Removal And Installation
      • Disassembly And Assembly
      • Inspection
    • BUCKET POSITION VALVE (S/N 11999 & Below)
      • Removal And Installation
      • Disassembly And Assembly
    • HYDRAULIC RESERVOIR
      • Removing Fluid From The Reservoir
      • Removal And Installation
    • HYDRAULIC FILTER
      • Removal And Installation
      • Disassembly And Assembly
    • PORT BLOCK (S/N 12001 & Above)
      • Removal And Installation
      • Disassembly And Assembly
    • BUCKET POSITION VALVE (S/N 12001 & Above)
      • Removal And Installation
      • Disassembly And Assembly
    • FAN MOTOR (S/N 12001 & Above)
      • Removal And Installation
      • Disassembly And Assembly
  • HYDROSTATIC SYSTEM
    • TROUBLESHOOTING
    • CONTROL CENTER (S/N 11999 & Below)
      • Removal And Installation
    • LIFT AND TILT PEDALS
      • Removal And Installation
      • Pedal Cable Control Linkage
      • Pedal Lock Linkage
      • Adjustment
    • STEERING LEVERS AND SHAFT (S/N 11999 & Below)
      • Removal And Installation
    • HYDROSTATIC MOTOR
      • Removal And Installation
      • Disassembly And Assembly
      • Inspection
    • HYDROSTATIC PUMP
      • High Pressure And Replenishing Valves
      • Checking The High Pressure Relief Replenishing Valve
      • Checking Charge Relief Pressure
      • Removal And Installation
      • Installation
      • Disassembly And Assembly
      • Inspection
      • Tow Valves
      • Removal And Installation
      • Neutral Adjustment
    • HYDROSTATIC FILTER
      • Removal And Installation
      • Disassembly And Assembly
    • DRIVE BELT
      • Removal And Installation
    • DRIVE BELT TENSION PULLEY
      • Removal And Installation
    • CONTROL CENTER (S/N 12001 & Above)
      • Removal And Installation
    • STEERING LEVERS AND SHAFT (S/N 12001 & Above)
      • Removal And Installation
  • DRIVE SYSTEM
    • PARKING BRAKE
      • Adjustment
      • Removal And Installation
      • Block And Pucks
    • AXLE SEAL AND WEAR RING
      • Removal And Installation
    • FRONT AXLE AND SPROCKET
      • Removal
      • Installation
    • REAR AXLE, SPROCKET AND DRIVE CHAIN
      • Removal
      • Installation
    • DRIVE CHAINS
      • Front Drive Chain Removal And Installation
      • Rear Drive Chains
    • REDUCTION GEARCASE
      • Removal And Installation
      • Disassembly And Assembly
    • CHAINCASE FLUID
      • Removal
  • MAIN FRAME
    • OPERATOR CAB
      • Removal And Installation
    • OPERATOR CAB GAS CYLINDER
      • Removal And Installation
    • SEAT BAR (Without Gas Spring)
      • Removal And Installation
      • Seat Bar Inspection
      • Seat Bar System
      • Seat Bar Maintenance
    • SEAT BAR (With Gas Spring)
      • Removal And Installation
    • REAR GRILL GAS CYLINDER
      • Removal And Installation
    • REAR DOOR
      • Removal And Installation
    • LIFT ARMS
      • Removal And Installation
    • BOB–TACH
      • Removal And Installation
      • Bob–Tach Wedges (S/N 11503 & Below)
      • Bob–Tach Lever (S/N 11503 & Below)
      • Bob–Tach Wedge and Lever (Starting with S/N 11504)
    • FUEL TANKS
      • Fuel Tank Left Side Removal And Installation
      • Fuel Tank Right Side Removal And Installation
      • Fuel Tank Pick Up Hose
    • MAIN FRAME
      • Main Frame Bolts
  • ELECTRICAL SYSTEM
    • ELECTRCAL SCHEMATICS
    • DESCRIPTION
    • TROUBLESHOOTING
    • SEALED ELECTRICAL TERMINAL
      • Removal And Installation
    • BATTERY
      • Checking The Batteries
      • Removal And Installation
    • DELCO ALTERNATOR
      • Alternator Belt Adjustment
      • Checking Alternator Wiring Harness
      • Checking Alternator Output
      • Checking Alternator Regulator
      • Removal And Installation
      • Disassembly And Assembly
      • Assembly
    • MELROE ALTERNATOR
      • Checking The Alternator Output
      • Checking The Alternator Regulator
      • Removal And Installation
      • Disassembly And Assembly
    • STARTER
      • Checking The Starter
      • Removal And Installation
      • Disassembly And Assembly
      • Cleaning And Inspection
      • Replacing The Brushes
    • OPERATOR CAB HARNESS
      • Removal And Installation
    • CHASSIS HARNESS
      • Removal And Installation
    • ENGINE HARNESS
      • Removal And Installation
  • ENGINE SERVICE
    • TROUBLESHOOTING
    • VALVE CLEARANCE
      • Adjustment
    • ENGINE COMPRESSION
      • Checking
    • FUEL FILTER
      • Removal And Installation
    • FUEL LIFT PUMP
      • Checking
      • Removal And Installation
    • REMOVING AIR FROM FUEL SYSTEM
      • Procedure
    • FUEL INJECTION PUMP
      • Removal And Installation
    • ENGINE TIMING TO INJECTION PUMP
      • Procedure
    • CHECKING TIMING MARK ON INJECTION PUMP FLANGE
      • Procedure
    • FUEL INJECTOR NOZZLES
      • Removal And Installation
    • ENGINE
      • Removal And Installation
    • RADIATOR AND OIL COOLER
      • Removal And Installation
    • ENGINE MUFFLER
      • Removal And Installation
    • EXHAUST GAS PURIFIER (Optional)
      • Function
      • Cleaning The Exhaust Gas Purifier
    • ENGINE MOUNTS
      • Removal And Installation
    • ENGINE FLYWHEEL
      • Removal And Installation
      • Flywheel Ring Gear
    • CYLINDER HEAD
      • Removing The Cylinder Head
      • Cylinder Head Surface Alignment
      • Installing The Cylinder Head
    • VALVES
      • Removal Of The Valves
      • Installing The Valves
      • Reconditioning The Valves And Valve Seats
      • Installing Valve Guides
      • Install The Valve Seats
      • Checking The Valve Springs
    • ROCKER ARMS
      • Disassembly
      • Assembly
    • PISTON AND CONNECTING RODS
      • Removal
      • Disassembly
      • Inspection
      • Installation
    • CYLINDER LINERS
      • Removal
      • Installation
    • MAIN BEARINGS
      • Removal
      • Installation
      • Crankshaft End Play
    • CRANKSHAFT
      • Removal
      • Checking
      • Installation
    • REAR MAIN OIL SEAL
      • Removal And Installation
    • TIMING CASE COVER
      • Removal And Installation
    • IDLER GEAR AND HUB
      • Removal And Installation
    • CAMSHAFT GEAR
      • Removal And Installation
    • FUEL INJECTION PUMP GEAR
      • Removal And Installation
      • Installation
    • CRANKSHAFT GEAR
      • Removal
    • TIMING CASE
      • Removal And Installation
      • Installation
    • CAMSHAFT
      • Removal And Installation
      • Inspection
      • Installation
    • WATER PUMP
      • Disassembly Of Water Pump
      • Inspection Of The Water Pump
      • Assembly Of The Water Pump
    • LUBRICATION SYSTEM
      • Description
    • BALANCER UNIT
      • Removal And Installation
      • Engine Timing To Balancer Unit
      • Oil Pump Removal And Installation
      • Oil Pump Inspection
      • Oil Pump Relief Valve
      • Disassembly And Assembly
      • Inspection
  • TECHNICAL DATA
    • LOADER SPECIFICATIONS (S/N 11999 & Below)
      • OPERATION & PERFORMANCE
      • ENGINE
      • HYDRAULIC SYSTEM
      • ELECTRICAL
      • DRIVE SYSTEM
      • CAPACITIES
      • TIRES
    • LOADER SPECIFICATIONS (S/N 12001 & Above)
      • OPERATION & PERFORMANCE
      • ENGINE
      • HYDRAULIC SYSTEM
      • ELECTRICAL
      • DRIVE SYSTEM
      • CAPACITIES
      • TIRES
    • ENGINE SPECIFICATIONS
      • Cylinder Head
      • Valve Guides
      • Exhaust Valves
      • Intake Valves
      • Valve Springs
      • Rocker Arms & Tappets
      • Piston & Piston Rings
      • Connecting Rod, Piston Pin & Bushing
      • Cylinder Block & Liners
      • Crankshaft, Main, Connecting Rod Bearings & Thrust Washer
      • Camshaft & Thrust Washer
      • Timing Case & Timing Gears
      • Oil Pump, Gear & Relief Valve
      • Cooling System & Water Pump
      • Fuel Lift Pump, Injection Pump & Injectors
      • De–Rating For Altitude
      • Balance Unit (Center Mounted)
      • Crankshaft Regrind Data
      • Engine Torque
      • Service Wear Limits
    • HYDRAULIC/HYDROSTATIC FLUID SPECIFICATIONS
    • DECIMAL AND MILLIMETER EQUIVALENTS
    • U.S. TO METRIC CONVERSION
    • STANDARD TORQUE SPECIFICATIONS FOR BOLTS
  • SERVICE MANUAL REVISIONS
    • 943–1
    • 943–2
    • 943–3
    • 943–4
    • 943–5
    • 943–6
    • 943–7
    • 943–8
    • 943–9
    • 943–10
    • 943–11
    • 943–12
    • 943–13
    • 943–14
    • 943–15
    • 943–16
    • 943–17
    • 943-18

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