Document Outline

• TM1590 - 316,318,420 Lawn & Garden Tractors
  • CONTENTS
  • Section 10 - GENERAL INFORMATION
    • Safety
      • RECOGNIZE SAFETY INFORMATION
      • UNDERSTAND SIGNAL WORDS
      • FOLLOW SAFETY INSTRUCTIONS
      • HANDLE FLUIDS SAFELY—AVOID FIRES
      • PREVENT BATTERY EXPLOSIONS
      • PREPARE FOR EMERGENCIES
      • PREVENT ACID BURNS
      • HANDLE CHEMICAL PRODUCTS SAFELY
      • AVOID HIGH-PRESSURE FLUIDS
      • PREPARE MACHINE FOR REPAIR
      • SUPPORT MACHINE PROPERLY
      • WEAR PROTECTIVE CLOTHING
      • WORK IN CLEAN AREA
      • SERVICE MACHINES SAFELY
      • WORK IN VENTILATED AREA
      • ILLUMINATE WORK AREA SAFELY
      • REPLACE SAFETY SIGNS
      • USE PROPER LIFTING EQUIPMENT
      • REMOVE PAINT BEFORE WELDING OR HEATING
      • AVOID HEATING NEAR PRESSURIZED FLUID LINES
      • SERVICE TIRES SAFELY
      • AVOID HARMFUL ASBESTOS DUST
      • PRACTICE SAFE MAINTENANCE
      • USE PROPER TOOLS
      • DISPOSE OF WASTE PROPERLY
      • LIVE WITH SAFETY
    • General Specifications
      • MACHINE SPECIFICATIONS
    • Repair Specifications
      • REPAIR SPECIFICATIONS
      • METRIC BOLT AND CAP SCREW TORQUE VALUES
      • UNIFIED INCH BOLT AND CAP SCREW TORQUE VALUES
      • METRIC CAP SCREW TORQUE VALUES—GRADE 7
      • SERVICE RECOMMENDATIONS FOR O-RING BOSS FITTINGS
      • SERVICE RECOMMENDATIONS FOR FLAT FACE O-RING SEAL FITTINGS
      • TUBE AND HOSE FITTING, 37˚ FLARE AND 30˚ CONE SEAT CONNECTOR SERVICE RECOMMENDATIONS
    • Test and Adjustment Specifications
      • TEST AND ADJUSTMENT SPECIFICATIONS
    • Fuels and Lubricants
      • FUEL
      • STORING FUEL
      • ENGINE OIL
      • TRANSMISSION AND HYDRAULIC OIL
      • GREASE
      • MOWER DECK GEAR CASE OIL
      • ALTERNATIVE AND SYNTHETIC LUBRICANTS
      • LUBRICANT STORAGE
      • MIXING OF LUBRICANTS
    • Serial Number Locations
      • SERIAL NUMBERS
      • PRODUCT IDENTIFICATION NUMBER
      • ENGINE SERIAL NUMBER
      • TRANSMISSION SERIAL NUMBER
      • DIFFERENTIAL SERIAL NUMBER
      • CONTROL VALVE SERIAL NUMBER
  • Section 20 - ENGINE REPAIR
    • Engine
      • ONAN ENGINE REPAIR—USE CTM2
      • REMOVE AND INSTALL ENGINE
  • Section 40 - ELECTRICAL REPAIR
    • Front PTO Clutch
      • REMOVE FRONT PTO CLUTCH
      • DISASSEMBLE, INSPECT AND ASSEMBLE FRONT PTO CLUTCH
      • INSTALL FRONT PTO CLUTCH
  • Section 50 - POWER TRAIN REPAIR
    • Transmission
      • SERVICE PARTS KITS
      • REMOVE AND INSTALL CHARGE PUMP
      • DISASSEMBLE AND INSPECT CHARGE PUMP
      • ASSEMBLE CHARGE PUMP
      • REMOVE AND INSTALL CHARGE RELIEF VALVE
      • REMOVE AND INSTALL IMPLEMENT RELIEF VALVE
      • REMOVE TRANSMISSION
      • DISASSEMBLE TRANSMISSION COVER
      • DISASSEMBLE PUMP AND MOTOR
      • DISASSEMBLE PUMP AND MOTOR HOUSING
      • ASSEMBLE PUMP AND MOTOR HOUSING
      • ASSEMBLE PUMP AND MOTOR
      • ASSEMBLE TRANSMISSION COVER
      • INSTALL TRANSMISSION
    • Transmission Control Linkage
      • INSPECT AND REPAIR TRANSMISSION CONTROL LINKAGE—VERSION ONE (ALL MODELS)
      • INSPECT AND REPAIR TRANSMISSION CONTROL LINKAGE—VERSION TWO (316 AND 318)
      • INSPECT AND REPAIR TRANSMISSION CONTROL LINKAGE—VERSION TWO (420)
      • INSPECT AND REPAIR TRANSMISSION CONTROL LINKAGE—VERSION THREE (ALL MODELS)
      • INSPECT AND REPAIR TRANSMISSION CONTROL LINKAGE—VERSION FOUR (ALL MODELS)
      • INSPECT AND REPAIR DIFFERENTIAL LOCK AND TWO-SPEED CONTROL LINKAGE (420)
    • Differential
      • SERVICE PARTS KITS
      • REMOVE AND INSTALL DIFFERENTIAL
      • DISASSEMBLE AND INSPECT DIFFERENTIAL
      • ASSEMBLE DIFFERENTIAL
    • Rear Axles
      • REMOVE AXLE
      • INSTALL AXLE
    • Drive Shaft
      • REMOVE AND INSTALL DRIVE SHAFT—316
      • REMOVE AND INSTALL DRIVE SHAFT—318 AND 420
      • DISASSEMBLE AND INSPECT DRIVE SHAFT
      • ASSEMBLE DRIVE SHAFT
  • Section 60 - STEERING AND BRAKE REPAIR
    • Steering¯316
      • SPECIAL OR ESSENTIAL TOOLS
      • SERVICE PARTS KITS
      • REMOVE AND INSTALL STEERING GEARBOX AND SHAFT
      • DISASSEMBLE AND INSPECT STEERING GEARBOX AND SHAFT
      • ASSEMBLE STEERING GEARBOX AND SHAFT
    • Steering¯318 and 420
      • SERVICE PARTS KITS
      • REMOVE AND INSTALL STEERING VALVE AND COLUMN
      • DISASSEMBLE AND INSPECT STEERING VALVE AND COLUMN
      • ASSEMBLE STEERING VALVE AND COLUMN
      • REMOVE AND INSTALL STEERING CYLINDER
    • Brakes
      • REMOVE BRAKES
      • INSTALL BRAKES
      • ADJUST BRAKES
      • INSPECT AND REPAIR BRAKE PEDAL AND NEUTRAL RETURN LINKAGE—316
      • INSPECT AND REPAIR BRAKE PEDALS AND NEUTRAL RETURN LINKAGE—318
      • INSPECT AND REPAIR BRAKE PEDALS AND NEUTRAL RETURN LINKAGE—420
      • INSPECT AND REPAIR PARK BRAKE LEVER
  • Section 70 - HYDRAULIC REPAIR
    • Hydraulic Control Valve
      • SERVICE PARTS KITS
      • REMOVE AND INSTALL HYDRAULIC CONTROL VALVE—316 AND 318
      • REMOVE AND INSTALL HYDRAULIC CONTROL VALVE—420
      • DISASSEMBLE, INSPECT AND ASSEMBLE HYDRAULIC CONTROL VALVE—SINGLE-SPOOL
      • DISASSEMBLE, INSPECT AND ASSEMBLE HYDRAULIC CONTROL VALVE—TWO-SPOOL
      • DISASSEMBLE, INSPECT AND ASSEMBLE HYDRAULIC CONTROL VALVE—THREE-SPOOL
  • Section 80 - MISCELLANEOUS REPAIR
    • Front Axle
      • SPECIAL OR ESSENTIAL TOOLS
      • REMOVE AND INSTALL FRONT AXLE—316 AND 318
      • INSPECT AND REPLACE PIVOT BUSHINGS—316 AND 318
      • REMOVE FRONT AXLE—420
      • DISASSEMBLE AND INSPECT PIVOT PIN—420
      • ASSEMBLE PIVOT PIN—420
      • INSTALL FRONT AXLE—420
      • REMOVE AND INSTALL SPINDLES
      • INSPECT AND REPLACE SPINDLE BUSHINGS
      • INSPECT AND REPLACE WHEEL BEARINGS
      • ADJUST TOE-IN
    • Mower Spindle and Jack Sheave Repair
      • SERVICE MOWER BLADE SPINDLES—38 (EARLY), 46 AND 50-INCH MOWER
      • SERVICE MOWER BLADE SPINDLES—38-INCH MOWER (LATER)
      • SERVICE MOWER BLADE SPINDLES—EARLY 60-INCH AND 260 ROTARY MOWER
      • SERVICE MOWER BLADE SPINDLES—LATER 60-INCH AND 260 ROTARY MOWER
      • SERVICE MOWER BLADE JACK SHEAVES—46 AND 50-INCH MOWER
    • Mower Gear Case Repair
      • DISASSEMBLE AND INSPECT MOWER GEAR CASE—50-INCH MOWER
      • ASSEMBLE MOWER GEAR CASE—50-INCH MOWER
      • DISASSEMBLE AND INSPECT MOWER GEAR CASE—EARLY 60-INCH MOWER (CURTIS)
      • ASSEMBLE MOWER GEAR CASE—EARLY 60-INCH MOWER (CURTIS)
      • DISASSEMBLE AND INSPECT MOWER GEAR CASE—LATER 60-INCH MOWER (PEERLESS)
      • ASSEMBLE MOWER GEAR CASE—LATER 60-INCH MOWER (PEERLESS)
      • DISASSEMBLE AND INSPECT MOWER GEAR CASE—260 ROTARY MOWER
      • ASSEMBLE MOWER GEAR CASE—260 ROTARY MOWER
  • Section 220 - ENGINE, FUEL AND AIR SYSTEM CHECKOUT AND DIAGNOSIS
    • Engine, Fuel and Air System Checkout
      • BEFORE YOU START
    • Diagnosis, Tests and Adjustments
      • ABOUT THIS GROUP
  • Section 240 - ELECTRICAL CHECKOUT, OPERATION AND DIAGNOSIS
    • Electrical System Checkout
      • BEFORE YOU START
    • Electrical Schematics
      • 316, 318 AND 420 ELECTRICAL SCHEMATIC—SINGLE PTO
      • 316, 318 AND 420 ELECTRICAL SCHEMATIC—DUAL PTO
    • Component Location and Operation
      • ELECTRICAL COMPONENT LOCATION
      • STARTING CIRCUIT OPERATION
      • IGNITION CIRCUIT OPERATION
      • PTO CIRCUIT OPERATION
      • CHARGING CIRUIT OPERATION
      • OIL PRESSURE LAMP CIRCUIT OPERATION
    • Electrical System Diagnosis
      • ABOUT THIS GROUP
    • Electrical System Component Tests and Adjustments
      • BEFORE YOU START
  • Section 250 - POWER TRAIN CHECKOUT, OPERATION AND DIAGNOSIS
    • Power Train Checkout
      • BEFORE YOU START
    • Theory of Operation
      • HYDROSTATIC TRANSMISSION OPERATION
    • Diagnosis, Tests and Adjustments
      • Troubleshooting Guide
      • charge pressure test
      • implement relief pressure test
      • charge pump flow test
      • steering valve neutral check
      • hydro neutral return linkage adjustment
      • later version hydro neutral return adjustment
      • 2 speed linkage check
      • differential lock linkage check
  • Section 260 - STEERING AND BRAKES CHECKOUT, OPERATION AND DIAGNOSIS
    • Steering And Brakes System Checkout
      • BEFORE YOU START
    • Theory of Operation
      • STEERING VALVE/SYSTEM OPERATION—FOUR-PORT VALVE
      • STEERING VALVE/SYSTEM OPERATION—FIVE-PORT VALVE
    • Diagnosis, Tests and Adjustments
      • Troubleshooting guide
      • steering system leakage test
  • Section 270 - HYDRAULIC SYSTEM CHECKOUT, OPERATION AND DIAGNOSIS
    • Hydraulic System Checkout
      • hydraulic control valve check
    • Hydraulic Schematics
      • HYDRAULIC SYSTEM SCHEMATICS
      • HYDRAULIC CIRCUIT SYMBOLS
      • LEGEND FOR HYDRAULIC SYSTEM SCHEMATIC—316
      • LEGEND FOR HYDRAULIC SYSTEM SCHEMATIC—EARLY 318
      • LEGEND FOR HYDRAULIC SYSTEM SCHEMATIC—LATER 318
      • LEGEND FOR HYDRAULIC SYSTEM SCHEMATIC—EARLY 420
      • LEGEND FOR HYDRAULIC SYSTEM SCHEMATIC—LATER 420
    • Theory of Operation
      • HYDRAULIC LIFT SYSTEM OPERATION—THREE-POSITION SPOOL
      • HYDRAULIC LIFT SYSTEM OPERATION—FOUR-POSITION SPOOL
    • Diagnosis, Tests and Adjustments
      • Troubleshooting guide
      • rockshaft cylinder leakage test
      • control valve leakage test
      • test implement relief pressure
      • bleed hydraulic system
  • Section 299 - DEALER FABRICATED TOOLS
    • Dealer Fabricated Tools
      • DFMX1 STEERING VALVE FIXTURE
      • DFMX2 ALIGNMENT SHIMS
  • Index
    • A
      • Alternator, Tests