A 743 loader is a basic, mechanical Bobcat skid-steer that spends its life loading trucks, cleaning barns, feeding mixers, and doing light dirt work. The person who reaches for this manual is the one actually turning wrenches, not just running the machine. They want torque specs, hydraulic test points, wiring diagrams, and step-by-step teardown so the loader goes back out and stays out. If you're chasing oil leaks, drive issues, or electrical gremlins on a 743 in this serial range, this is the book you keep open on the bench.
What this manual helps you do
- Diagnose hard-start, smoke, or low-power complaints on the small diesel and verify adjustments after repairs
- Check hydrostatic and hydraulic system pressures, trace weak lift or tilt, and replace or reseal pumps, valves, and cylinders
- Follow teardown and reassembly of drive motors, chain cases, and axles after seal failures or water intrusion
- Trace electrical faults with readable wiring diagrams, then replace switches, relays, gauges, and safety interlocks correctly
- Adjust controls, linkages, and parking brake so the loader drives straight, stops right, and passes a rental-ready inspection
Who this is for
This is for a shop mechanic, field tech, rental yard, or owner-operator working on a Bobcat 743 loader in the 502511001-502599999 serial range. If you only need basic controls, fluids, and 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, these manuals are usually provided as searchable PDFs, and the wiring diagrams are scan quality that you can zoom on a laptop or tablet.
Q: How do I know if it covers my exact 743?
A: Check your serial plate; if your 743 falls between 502511001 and 502599999, this is the correct manual.
Q: Is this the right document for routine greasing and fluid checks?
A: No, this is a workshop repair manual; routine operation and simple maintenance are in the operator's manual.
Bottom line: If you're repairing or diagnosing a Bobcat 743 within that serial range, this is the right service manual. If you're just learning to run it, skip this and get the operator's book.
📘 Show Index
Table of Contents:
- MAINTENANCE SAFETY
- CONTENTS
- FOREWORD
- SAFETY INSTRUCTIONS
- SERIAL NUMBER LOCATIONS
- LOADER SERIAL NUMBER
- ENGINE SERIAL NUMBER
- DELIVERY REPORT
- BOBCAT SKID STEER LOADER IDENTIFICATION
- PREVENTIVE MAINTENANCE
- SERVICE SCHEDULE
- LIFTING AND BLOCKING THE LOADER
- TRANSPORTING THE BOBCAT LOADER
- LIFT ARM SUPPORT DEVICE
- OPERATOR CAB
- Raising The Operator Cab
- Lowering The Operator Cab
- Seat Bar Description
- Seat Bar Inspection
- Seat Bar Maintenance
- USING AN EXTRA BATTERY (JUMP STARTING)
- REMOTE START SWITCH
- HYDRAULIC SYSTEM
- HYDRAULIC /HYDROSTATIC SCHEMATICS
- TROUBLESHOOTING
- HYDRAULIC SYSTEM INFORMATION
- Flare Connections
- O–ring Face Seal Connection
- Tubelines And Hose
- LIFT CYLINDER
- Checking
- Removal And Installation
- TILT CYLINDER
- Checking
- Removal And Installation
- HYDRAULIC CONTROL VALVE (Gresen)
- Checking The Relief Valve
- Main Relief Valve Removal And Installation
- Removal and Installation
- Disassembly And Assembly
- Inlet Section
- Tilt Section
- Lift Section
- Auxiliary Section
- Valve Spool Bolt
- Adjusting The Auxiliary Detent
- HYDRAULIC PUMP (S/N 14999 & Below)
- Checking The Output Of The Hydraulic Pump
- Removal And Installation
- HYDRAULIC PUMP (S/N 15001 & Above)
- Removal And Installation
- Vane Pump Drive Shaft Removal And Checking
- Hydraulic Pump Starting Procedure
- PORT BLOCK (S/N 14999 & Below)
- 40 Micron Filter (Bronze)
- Cold Weather By–Pass Valve
- Neutral By–Pass Valve
- Removal And Installation
- PORT BLOCK (S/N 15001 & Above)
- Cold Weather By–Pass Valve Removal And Installation
- Case Drain Relief Valve Removal And Installation
- Removal And Installation
- HYDRAULIC/HYDROSTATIC RESERVOIR
- Checking And Adding Oil
- Removing Hydraulic Oil
- Removal And Installation
- OIL COOLER
- Removal And Installation (741)
- Removal And Installation (742 & 743)
- 10 MICRON FILTER BY–PASS VALVE
- HYDRAULIC CONTROL PEDALS (S/N 14999 & Below)
- Removal And Installation
- Adjustment
- HYDRAULIC CONTROL PEDALS (S/N 15001 & Above)
- Removal And Installation
- Adjustment
- PEDAL LOCK LINKAGE
- HYDROSTATIC SYSTEM
- TROUBLESHOOTING
- HYDROSTATIC SYSTEM INFORMATION
- High Pressure Relief/Replenishing Valve Function
- STEERING LEVERS
- Removal And Installation
- Repairing The Steering Levers
- STEERING LINKAGE
- Adjustment
- Removal And Installation
- Repairing The Pintle Lever
- HYDROSTATIC MOTOR
- HYDROSTATIC PUMP
- Checking The High Pressure Relief Replenishing Valves
- To Use The Special Tool Kit (MEL1173)
- Checking Charge Pressure (S/N 14999 & Below)
- Checking Charge Pressure (S/N 15001 & Above)
- Removal
- Installation
- TOW VALVES
- DRIVE SYSTEM
- PARKING BRAKE
- Adjustment
- Removal and Installation
- Block and Pucks
- AXLES, SEALS AND BEARINGS
- FINAL DRIVE CHAIN
- REDUCTION GEARCASE
- Removal and Installation
- Checking Reduction Gearcase
- Disassembly and Assembly
- Reduction Gearcase Seal
- Installation
- CHAINCASE FLUID
- Replacing Chaincase Fluid
- MAIN FRAME
- OPERATOR CAB (S/N 19999 & Below)
- OPERATOR CAB (S/N 20001 & Above)
- REAR DOOR
- Removal And Installation
- Door Latch Adjustment
- LIFT ARMS
- BOB–TACH
- Removal And Installation
- Tilt Cylinder Rod End Seal
- Disassembly And Assembly
- FUEL TANK (S/N 19999 & Below)
- FUEL TANK (S/N 20001 & Above)
- Removal And Installation
- Fuel Tank Sender Switch
- ELECTRICAL SYSTEM
- ELECTRICAL SCHEMATICS
- ELECTRICAL SYSTEM INFORMATION
- TROUBLESHOOTING
- BATTERY
- Checking The Battery
- Removal And Installation
- ALTERNATOR
- Alternator Belt Adjustment (741)
- Alternator Belt Adjustment (742)
- Alternator Belt Adjustment (743)
- Removal And Installation
- Disassembly And 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
- Disassembly And Assembly (Gear Reduction)
- Replacing The Brushes
- Cleaning and Inspection
- ENGINE SERVICE
- ENGINE SERVICE (Deutz 741)
- TROUBLESHOOTING
- FUEL SYSTEM
- Fuel System Service
- Venting Air From The Fuel System
- Fuel Filters
- Fuel Water Trap
- Fuel Lift Pump
- Fuel Injection Pump
- Injection Pump Removal And Installation
- Fuel Delivery Adjustment
- FUEL INJECTION NOZZLES
- Removal And Installation
- Injection Disassembly And Repair (In The Shop)
- BLOWER FAN
- Removal And Installation
- Disassembly And Assembly
- ENGINE SERVICE
- CYLINDER HEAD AND VALVES
- Removal
- Disassembly And Assembly
- Checking Piston Crown Clearance
- Cylinder Head Installation
- CYLINDER, PISTONS AND CONNECTING RODS
- OIL PUMP, FILTER HOUSING AND RELIEF VALVE
- Oil Pump Removal And Installation
- Oil Pressure Relief Valve
- ENGINE FRONT COVER
- Removal
- Disassembly And Assembly
- Installation
- GOVERNOR
- CAMSHAFT
- CRANKSHAFT
- Removal
- Inspection
- Assembly
- UNIVERSAL JOINT
- FLYWHEEL
- Removal And Installation
- Ring Gear Removal And Installation
- ENGINE OIL COOLER
- ENGINE SHROUDING
- ENGINE MOUNTS
- MUFFLER
- STARTER
- ENGINE SERVICE (Ford 742)
- TROUBLESHOOTING
- CHECKS AND ADJUSTMENTS
- Oil Pressure
- Valve Clearance
- Compression
- Carburetor, Throttle And Governor Adjustments
- Governor Oil Level
- Ignition System
- Spark Plug Wires Resistance Test
- Spark Plug Test
- Distributor Tests
- Test Connections
- Dwell Angle Check
- Spark Strength Tests
- Ignition System Tests
- Battery To Coil Voltmeter Test
- Starting Ignition Circuit Voltmeter Test
- Breaker Point Gap Adjustment
- Ignition Timing
- Timing Marks Location
- Initial Ignition Timing
- CARBURETOR REPAIR
- ENGINE DIAGNOSIS AND TESTING
- Camshaft Lobe Lift
- Crankshaft End Play
- Flywheel Surface Alignment Check
- Camshaft End Play
- ENGINE REMOVAL
- ENGINE REPAIR
- Cylinder Head
- Valve Guides
- Grinding The Valve Seats
- Valves
- Grinding Valves
- Selecting Fitting Of The Valves
- Camshaft Repair
- Crankshaft
- Repairing Journals
- To Check Crankshaft Or Connection Rod Bearings With Plastigage
- Install Pistons
- Installing Piston Rings
- Installing The Piston Pins
- Valve Rocker Arm And Shaft Assembly
- Push Rods
- CYLINDER BLOCK
- Finishing The Cylinder Walls
- CYLINDER HEADS
- Cleaning The Cylinder Heads
- Checking The Cylinder Heads
- TAPPETS
- Cleaning The Tappets
- Checking The Tappets
- CAMSHAFT
- Cleaning And Checking The Camshaft
- CRANKSHAFT
- FLYWHEEL
- CONNECTING RODS
- Cleaning The Connecting Rods
- Checking The Connecting Rods
- PISTONS, PINS AND RINGS
- Cleaning The Pistons, Pins And Rings
- Checking The Pistons, Pins And Rings
- MAIN BEARINGS AND CONNECTING ROD BEARINGS
- Cleaning Bearings
- Checking Bearings
- CYLINDER BLOCK
- Cleaning The Cylinder Block
- Checking The Cylinder
- OIL PUMP
- Cleaning The Oil Pump
- Checking The Oil Pump
- VALVE ROCKER ARM COVER AND ROCKER ARM SHAFT
- Removing And Disassembly Of The Rocker Arm Shaft
- Installing Rocker Arm Shaft
- VALVE PUSHRODS
- INTAKE MANIFOLD
- CYLINDER HEAD
- VALVE SPRING, RETAINER AND STEM SEAL (With The Cylinder Head Removed)
- Removing The Valve Spring
- Installing The Valve Spring
- VALVE SPRING, RETAINER AND STEM SEAL (With The Cylinder Head Installed)
- WATER PUMP
- CYLINDER FRONT COVER, TIMING CHAIN AND CRANKSHAFT SPROCKETS
- Removal
- Removing the Timing Cover
- Installation Of The Timing Cover
- FRONT OIL SEAL
- TIMING CHAIN TIGHTENING
- CAMSHAFT AND VALVE LIFTERS
- OIL PAN
- OIL PUMP
- CRANKSHAFT REAR OIL SEAL
- MAIN BEARINGS
- CONNECTING ROD BEARINGS
- PISTONS AND CONNECTING RODS
- CAMSHAFT BEARINGS
- CRANKSHAFT
- UNIVERSAL JOINT
- FLYWHEEL
- FLYWHEEL RING GEAR
- MUFFLER
- RADIATOR
- BLOWER HOUSING
- STARTER
- ENGINE SERVICE (Kubota 743)
- TROUBLESHOOTING
- FUEL FILTER
- Replacing The Fuel Filter
- Removing Air From The Fuel System
- GLOW PLUG
- FUEL INJECTION PUMP
- Checking The Injection Pump
- Removal and Installation
- Timing The Injection Pump
- FUEL INJECTOR NOZZLES
- Removal And Installation
- Checking the Nozzles
- ENGINE
- RADIATOR AND OIL COOLER
- BLOWER HOUSING
- ENGINE FLYWHEEL AND U–JOINT
- FLYWHEEL RING GEAR
- MUFFLER
- CYLINDER HEAD
- Removal
- Disassembly
- Servicing
- Valve Guide Installation
- Assembly
- Installation
- ENGINE REPAIR
- Gearcase Removal
- Timing Gear, Camshaft And Oil Pump Removal
- Pistons And Crankshaft Removal
- Timing Gear And Camshaft Service
- Servicing The Connecting Rods And Pistons
- Crankshaft Service
- Cylinder Liner Service
- Lubrication System
- Oil Pump Service
- Water Pump Service
- ENGINE ASSEMBLY
- Crankshaft Installation
- Installing The Pistons
- Installing The Camshaft And Timing Gears
- Gearcase Installation
- ENGINE SERVICE (Mitsubishi 742)
- TROUBLESHOOTING
- VALVE CLEARANCE
- ENGINE COMPRESSION
- IGNITION TIMING
- DISTRIBUTOR
- Removal And Installation
- Point Gap Adjustment
- Disassembly And Assembly
- Checking Centrifugal Advance
- Checking Vacuum Advance
- CARBURETOR
- Description
- Removal And Installation
- Disassembly And Assembly
- Inspection
- Adjustment
- Governor Adjustment
- FUEL PUMP
- Removal And Installation
- Inspection
- Check The Fuel Pump
- Fuel Filter
- ENGINE BELT SHIELD
- REAR GRILL
- ENGINE
- OIL COOLER AND BLOWER HOUSING
- RADIATOR
- ENGINE MUFFLER
- ENGINE FLYWHEEL AND U–JOINT
- Removal And Installation
- Flywheel Ring Gear
- ROCKER ARMS
- Removal
- Inspection
- Installation
- CAMSHAFT
- Removal And Installation
- Inspection
- CYLINDER HEAD
- Removal And Installation
- Inspection
- VALVES
- Removal
- Installation
- Reconditioning The Valve And Valve Seat
- Valve Seat Inserts
- Valve Guide
- Valve Spring
- PISTON AND CONNECTING ROD
- Removal
- Disassembly
- Inspection
- Assembly
- Installation
- PISTON PIN
- Assembly Of The Tool
- Removal
- Installation
- CYLINDER LINERS
- CRANKSHAFT AND MAIN BEARINGS
- Description
- Removal
- Checking
- Checking Oil Clearance (Plastic Gauge)
- Installation
- Crankshaft End Play
- Rear Oil Seal
- TIMING BELT
- Adjustment
- Removal
- Inspection
- Assembly
- FRONT CASE AND OIL PAN
- OIL PUMP
- Removal
- Inspection
- Installation
- Relief Valve
- FRONT CASE SEAL
- WATER PUMP
- Removal And Installation
- Inspection
- THERMOSTAT
- Removal And Installation
- Inspection
- SPECIFICATIONS
- 741 DEUTZ
- LOADER SPECIFICATIONS
- OPERATIONS & PERFORMANCE
- ENGINE
- HYDRAULIC SYSTEM
- ELECTRICAL
- DRIVE SYSTEM
- CAPACITIES
- TIRES
- MACHINE WEIGHT
- ENGINE SPECIFICATIONS
- Fuel System
- Governor, Front Cover and Throttle
- Cylinder Head and Valves
- Cylinder, Piston and Connecting Rod
- Cylinders
- Camshaft, Crankshaft, Bearings
- Lubrication System
- Engine Fastener Torque (Deutz Engine)
- 742 FORD
- LOADER SPECIFICATIONS
- OPERATIONS & PERFORMANCE
- ENGINE
- HYDRAULIC SYSTEM
- ELECTRICAL
- DRIVE SYSTEM
- CAPACITIES
- TIRES
- MACHINE WEIGHT
- ENGINE SPECIFICATIONS, 742 (Ford)
- Fuel Specifications
- Fuel System
- Engine Oil
- Lubrication System
- Cylinder Heads
- Valve Mechanism
- Camshaft
- Crankshaft
- Connecting Rod
- Piston
- Piston Rings
- Cylinder Block
- Ignition System
- Engine Fastener Torque
- 743 & 743DS KUBOTA
- LOADER SPECIFICATIONS
- OPERATIONS & PERFORMANCE
- ENGINE
- HYDRAULIC SYSTEM
- ELECTRICAL
- DRIVE SYSTEM
- CAPACITIES
- TIRES
- MACHINE WEIGHT
- ENGINE SPECIFICATIONS, 743 (Kubota)
- Fuel Injection Nozzles
- Fuel Injection Pump
- Cylinder Head
- Valves
- Valve Springs
- Rocker Arms
- Camshaft
- Cylinders
- Piston Rings
- Pistons
- Crankshaft
- Oil Pump
- Engine Oil
- Engine Bolt Torques
- 742 MISTUBISHI
- LOADER SPECIFICATIONS
- OPERATIONS & PERFORMANCE
- ENGINE
- HYDRAULIC SYSTEM
- ELECTRICAL
- DRIVE SYSTEM
- CAPACITIES
- TIRES
- ENGINE SPECIFICATIONS
- General
- Cylinder Head
- Cylinder Block
- Piston
- Piston Pin
- Connecting Rod
- Crankshaft
- Flywheel
- Camshaft
- Valve Train
- Valve Guide
- Valve Spring
- Rocker Arm And Shaft
- Oil Pump
- Fuel Pump
- Carburetor
- Water Pump
- Thermostat
- Starter
- Alternator
- Distributor
- Spark Plugs
- Engine Torque
- TECHNICAL DATA
- HYDRAULIC/HYDROSTATIC FLUID SPECIFICATIONS
- DECIMAL AND MILLIMETER EQUIVALENTS
- U.S. TO METRIC CONVERSION
- TORQUE FOR GENERAL METRIC BOLTS
- STANDARD TORQUE SPECIFICATIONS FOR BOLTS
- SERVICE MANUAL REVISIONS
- 740-1
- 740-2
- 740-3
- 740-4
- 740-5
- 740-6
- 740-7
- 740-8
- 740-9
- 740-10
- 740-11
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