Kubota KX018-4 Workshop Manual — RY911-21920

About this manual

Kubota published this Workshop Manual for the KX018-4 excavator models. It brings the documented service and technical-reference material for those named excavators into a single publication.

Its documented technical value includes fluid and system capacities and speed ratings for service checks and specification lookup. Use the values and conditions stated in the PDF for the applicable model and procedure.

Use the Manual Contents below to check that the exact repair, inspection, or maintenance procedure you need is included in this publication.

Manual details

Manufacturer

Kubota

Manual type

Workshop Manual

Models

KX018-4

Document number

RY911-21920

Language

English

Page count

349

Product highlights

Electrical systems

The manual includes wiring diagrams and electrical troubleshooting.

Hydraulic systems

The manual includes hydraulic pressure-test material and hydraulic valve-adjustment material.

Specifications and settings

The manual includes reference information for capacities and speed ratings.

Special tools

A special-tools section is included.

Maintenance

The manual includes a maintenance schedule and a lubrication chart.

Manual contents

Use these source headings to locate the task or system you need in the PDF.

• CONTENTS — p. 1
• TO THE READER — p. 2
• I INFORMATION — p. 3
  • INFORMATION — p. 4
    • 1. SAFETY FIRST — p. 5
    • 2. IN THE INTEREST OF WORK SAFETY — p. 6
      • [1] WORKING SAFELY WITH THE EQUIPMENT MEANS ALWAYS FOLLOWING THESE INSTRUCTIONS: — p. 6
        • (1) Precautions Before Working on the Mini-excavator — p. 6
        • (2) Precautions Before Working on the Equipment — p. 7
    • 3. LABELS DISPLAYED TO PROMOTE WORK SAFETY — p. 10
      • [1] LOCATIONS — p. 10
      • [2] LABEL MAINTENANCE — p. 15
    • 4. MAIN SPECIFICATIONS — p. 16
    • 5. DIMENSIONS — p. 17
• G GENERAL — p. 18
  • GENERAL — p. 19
    • 1. MACHINE INDENTIFICATION — p. 20
    • 2. ENGINE INDENTIFICATION — p. 21
      • [1] MODEL AND ENGINE SERIAL NUMBER — p. 21
    • 3. GENERAL PRECAUTIONS — p. 22
    • 4. PRECAUTIONS WHEN HANDLING ELECTRICAL PARTS AND WIRING — p. 26
      • [1] WIRING — p. 26
      • [2] FUSES — p. 28
      • [3] CONNECTORS — p. 28
      • [4] WASHING THE MINI-EXCAVATOR WITH A HIGH-PRESSURE WASHER — p. 29
    • 5. TORQUE SPECIFICATION TABLE — p. 30
      • [1] TORQUES FOR GENERAL USE NUTS AND BOLTS — p. 30
      • [2] TORQUES OF STUD BOLTS — p. 30
      • [3] TORQUE FOR HYDRAULIC HOSE FITTINGS — p. 31
        • (1) Torque for Hydraulic Hose Fittings — p. 31
        • (2) Torques of Lock-Nuts for Elbows with Male Seats and Adaptors with O-rings (Straight Threads) — p. 31
      • [4] HOSE CLAMP SCREW TORQUE — p. 32
    • 6. OIL AND WATER CAPACITY TABLE — p. 33
    • 7. MAINTENANCE INTERVALS — p. 34
      • [1] OPERATOR SERVICING — p. 34
      • [2] SERVICING BY SKILLED PERSONAL OR KUBOTA DEALER — p. 35
        • (1) For NA — p. 35
        • (2) For AU — p. 36
    • 8. DESCRIPTION OF PARTS — p. 37
      • [1] BUCKET — p. 37
      • [2] BUCKET INSTALLATION RELEVANT DIMENSIONS — p. 38
      • [3] BLADE — p. 38
      • [4] RUBBER CRAWLER — p. 39
      • [5] TRUCK ROLLER, IDLER, SPROCKET — p. 39
      • [6] CYLINDER — p. 40
      • [7] DIAGRAM AND LIST OF FRONT PINS — p. 41
      • [8] LIST OF FRONT BUSHING DIMENSIONS — p. 43
    • 9. WEIGHTS OF PARTS — p. 44
    • 10. QUALITY SPECIFICATIONS — p. 45
• 1 MACHINE BODY — p. 52
  • SERVICING — p. 53
    • 1. FRONT EQUIPMENT — p. 54
      • [1] BUCKET INSTALLATION AND REMOVAL — p. 54
      • [2] FRONT EQUIPMENT ATTACHMENT AND REMOVAL — p. 55
      • [3] BLADE REMOVAL AND MOUNTING — p. 56
    • 2. SWIVEL FRAME — p. 57
      • [1] WEIGHT DISASSEMBLY/ASSEMBLY — p. 57
      • [2] CANOPY REMOVAL AND MOUNTING — p. 58
      • [3] FUEL TANK REMOVAL AND MOUNTING — p. 59
      • [4] HYDRAULIC OIL TANK — p. 62
        • (1) Hydraulic Oil Tank Components — p. 62
      • [5] ENGINE — p. 63
        • (1) Engine Removal and Mounting — p. 63
        • (2) Engine Mounts — p. 66
        • (3) Muffler — p. 67
        • (4) Arch — p. 68
        • (5) Radiator, Oil Cooler — p. 69
      • [6] OPERATING LEVER ASSEMBLY — p. 70
        • (1) Travel Lever — p. 70
        • (2) Blade Lever — p. 71
        • (3) Adjustable Track Lever — p. 72
        • (4) Overall Routing of Blade and Adjustable Track Cables — p. 73
        • (5) Accelerator Lever — p. 74
        • (6) Accelerator Cable Routing — p. 75
        • (7) Swing Pedal — p. 76
        • (8) AUX Pedal — p. 77
    • 3. TRACK FRAME — p. 78
      • [1] SWIVEL BEARING ASSEMBLY — p. 78
      • [2] TRACK FRAME ASSEMBLY — p. 80
      • [3] TRACK — p. 81
        • (1) Rubber Track Disassembly/Assembly — p. 81
      • [4] FRONT IDLER — p. 82
        • (1) Front Idler Disassembly/Assembly — p. 82
        • (2) Front Idler Components — p. 82
      • [5] CYLINDER ASSEMBLY — p. 83
        • (1) Cylinder Assembly Disassembly/Assembly — p. 83
        • (2) Cylinder ASSY Components — p. 83
      • [6] TRACK ROLLER — p. 84
        • (1) Track Roller Disassembly/Assembly — p. 84
• 2 ENGINE — p. 85
  • GENERAL — p. 86
    • 1. ENGINE — p. 87
      • [1] ENGINE SPECIFICATIONS — p. 87
      • [2] PERFORMANCE CURVE — p. 88
      • [3] DIMENSIONS — p. 90
• 3 HYDRAULIC SYSTEM — p. 91
  • MECHANISM — p. 92
    • 1. DIAGRAM OF HYDRAULIC CIRCUIT — p. 94
      • [1] DIAGRAM OF HYDRAULIC CIRCUIT — p. 94
    • 2. HYDRAULIC DEVICE LAYOUT — p. 95
    • 3. PUMP — p. 96
      • [1] SPECIFICATIONS — p. 96
      • [2] COMPONENTS — p. 99
      • [3] FUNCTION AND STRUCTURE — p. 100
        • (1) Pump Operating Principles — p. 100
        • (2) Pump Horsepower Control Mechanism — p. 101
    • 4. CONTROL VALVE — p. 102
      • [1] SPECIFICATIONS — p. 102
      • [2] DIAGRAM OF HYDRAULIC CIRCUIT — p. 103
      • [3] FUNCTION AND STRUCTURE — p. 104
        • (1) Cross-section of Each Section — p. 104
        • (2) Straight Travel Circuit — p. 108
        • (3) Travel Alarm — p. 109
    • 5. SWIVEL MOTOR — p. 110
      • [1] SWIVEL MOTOR — p. 110
        • (1) Specifications — p. 110
        • (2) Components — p. 111
        • (3) Function and Structure — p. 112
    • 6. TRAVEL MOTOR — p. 113
      • [1] SPECIFICATIONS — p. 113
      • [2] COMPONENTS — p. 114
      • [3] FUNCTION AND STRUCTURE — p. 116
        • (1) Operating Principles — p. 116
        • (2) Counterbalance — p. 116
        • (3) 2-Speed Function — p. 118
        • (4) Auto Deceleration Function — p. 118
        • (5) Decelerator — p. 119
    • 7. HYDRAULIC CYLINDER — p. 120
      • [1] BOOM CYLINDER — p. 120
        • (1) Specifications — p. 120
        • (2) Components — p. 120
        • (3) Function and Structure — p. 121
      • [2] ARM CYLINDER — p. 123
        • (1) Specifications — p. 123
        • (2) Components — p. 123
      • [3] BUCKET CYLINDER — p. 124
        • (1) Specifications — p. 124
        • (2) Components — p. 124
      • [4] SWING CYLINDER — p. 125
        • (1) Specifications — p. 125
        • (2) Components — p. 125
      • [5] BLADE CYLINDER — p. 126
        • (1) Specifications — p. 126
        • (2) Components — p. 126
      • [6] ADJUSTABLE TRACK CYLINDER — p. 127
        • (1) Specifications — p. 127
        • (2) Components — p. 127
    • 8. PILOT VALVE — p. 128
      • [1] PILOT VALVE (BOOM, ARM, BUCKET, SWIVEL) — p. 128
        • (1) Specifications — p. 128
    • 9. UNLOAD VALVE — p. 130
      • [1] UNLOAD VALVE — p. 130
        • (1) Specifications — p. 130
    • 10. TPSS VALVE — p. 131
      • [1] TPSS VALVE — p. 131
        • (1) Specifications — p. 131
        • (2) Components — p. 131
  • SERVICING — p. 132
    • 1. PUMP — p. 134
      • [1] PUMP DISASSEMBLY/ASSEMBLY — p. 134
      • [2] PUMP DISASSEMBLY PROCEDURES — p. 136
        • (1) Disassembly Procedures — p. 137
        • (2) Assembly Procedures — p. 140
      • [3] SERVICE STANDARDS FOR PUMP PARTS — p. 143
    • 2. CONTROL VALVE — p. 144
      • [1] CONTROL VALVE REMOVAL AND INSTALLATION — p. 144
      • [2] CONTROL VALVE DISASSEMBLY/ASSEMBLY PROCEDURES — p. 146
    • 3. SWIVEL MOTOR — p. 159
      • [1] SWIVEL MOTOR REMOVAL AND INSTALLATION — p. 159
      • [2] SWIVEL MOTOR DISASSEMBLY/ASSEMBLY PROCEDURES — p. 160
        • (1) Disassembly Procedures — p. 161
        • (2) Assembly Procedures — p. 162
    • 4. SWIVEL JOINT — p. 167
      • [1] SWIVEL JOINT REMOVAL AND INSTALLATION — p. 167
    • 5. TRAVEL MOTOR — p. 169
      • [1] TRAVEL MOTOR REMOVAL AND INSTALLATION — p. 169
      • [2] TRAVEL MOTOR DISASSEMBLY/ASSEMBLY PROCEDURES — p. 170
        • (1) Disassembly Procedures — p. 172
        • (2) Assembly Procedures — p. 178
    • 6. HYDRAULIC CYLINDER — p. 187
      • [1] HYDRAULIC CYLINDER DISASSEMBLY/ASSEMBLY PROCEDURES — p. 187
        • (1) Cylinder Components — p. 187
        • (2) Disassembly Procedures — p. 188
        • (3) Assembly Procedures — p. 190
    • 7. PILOT VALVE — p. 194
      • [1] PILOT VALVE (CONTROL) DISASSEMBLY/ASSEMBLY PROCEDURES — p. 194
        • (1) Pilot Valve Components — p. 194
        • (2) Disassembly Procedures — p. 195
        • (3) Assembly Procedures — p. 197
    • 8. UNLOAD VALVE — p. 199
      • [1] UNLOAD VALVE ASSEMBLY PROCEDURES — p. 199
    • 9. PRESSURE SENSOR — p. 200
      • [1] PRESSURE SENSOR ASSEMBLY PROCEDURES — p. 200
    • 10. ROUTING OF HYDRAULIC HOSES — p. 201
      • [1] HYDRAULIC HOSE SPECIFICATIONS — p. 201
        • (1) Total Length of Hydraulic Hose — p. 201
        • (2) Types of Connector Fittings (Screw) — p. 201
      • [2] ROUTING OF HYDRAULIC HOSES — p. 202
        • (1) Delivery Hose Routing — p. 202
        • (2) Delivery Hose Clamp Positions — p. 204
        • (3) Suction Hose Routing — p. 205
        • (4) Front Hose Routing — p. 206
        • (5) Travel Hose Routing — p. 208
        • (6) Routing of Swivel, Blade, Swing and Adjustable Track Hoses — p. 209
        • (7) Track Frame Hose Routing — p. 210
        • (8) Return Hose Routing — p. 212
        • (9) Return Hose Clamp Position — p. 213
        • (10) Pilot Hose Routing — p. 215
        • (11) Pilot Hose Routing (Control Valve) — p. 217
        • (12) Entire Pilot Hose Routing — p. 218
        • (13) Pilot Hose Routing (Around the Driver's Seat) — p. 220
        • (14) TPSS Adapter — p. 221
    • 11. MEASURING THE PERFORMANCE OF HYDRAULIC DEVICES — p. 222
    • 12. TROUBLESHOOTING — p. 236
• 4 ELECTRICAL SYSTEM — p. 239
  • SERVICING — p. 240
    • 1. ELECTRONIC EQUIPMENT LAYOUT — p. 241
    • 2. WIRING CIRCUIT — p. 242
      • [1] PRECAUTIONS ON HOW TO CLAMP THE ELECTRICAL WIRING — p. 242
      • [2] PRECAUTIONS ON HANDLING ELECTRICAL CONNECTORS — p. 242
      • [3] UNPLUGGING ELECTRICAL CONNECTORS AND WIRING LAYOUT — p. 243
    • 3. TROUBLESHOOTING (START-UP EQUIPMENT VERSION) — p. 254
    • 4. CHECKS — p. 255
      • [1] POWER AND GROUND — p. 255
      • [2] STARTING AND STOPPING DEVICES — p. 258
    • 5. METER PANEL — p. 263
      • [1] NAMES AND FUNCTIONS OF METERS AND SWITCHES — p. 263
      • [2] NORMAL MODE — p. 263
      • [3] USER SETTINGS MODE — p. 264
      • [4] SERVICE DEALER MODE — p. 267
        • (1) Table of Diagnostic / Setting Items — p. 267
    • 6. TROUBLESHOOTING (METER PANEL) — p. 289
      • [1] ENGINE RELATED SYSTEM — p. 289
        • (1) Engine Oil Pressure Error (E:014) — p. 289
        • (2) Charging System Error (E:016) — p. 293
        • (3) Fuel Sensor Error (E:017) — p. 297
        • (4) Water Temperature Sensor Error (E:018) — p. 301
      • [2] MACHINE RELATED SYSTEM — p. 305
        • (1) Lever Lock System Error (E:020) — p. 305
        • (2) Travel 2-Speed System Error (E:021) — p. 310
      • [3] POWER SUPPLY SYSTEM — p. 315
        • (1) Over-Voltage (E:025) — p. 315
        • (2) External 5 V Short Error (E:027) — p. 317
        • (3) External 12 V Short Error (E:028) — p. 318
      • [4] COMMUNICATION SYSTEM — p. 319
        • (1) CAN Communication Error (E:001) — p. 319
      • [5] TRAVEL ALARM — p. 322
        • (1) Travel Alarm Error — p. 322
    • 7. FLOW CHART OF THE NORMAL AND USER SETTINGS MODES — p. 325
    • 8. SERVICE DEALER MODE FLOW CHART (1/2) — p. 326
    • 9. SERVICE DEALER MODE FLOW CHART (2/2) — p. 327
• 5 CABIN — p. 328
  • SERVICING — p. 329
    • 1. CABIN REMOVAL AND MOUNTING — p. 330
    • 2. HEATER REMOVAL AND INSTALLATION — p. 332
    • 3. CHECKS — p. 334
      • [1] HEATER RELATED — p. 334
        • (1) Blower Switch — p. 334
        • (2) Blower Motor — p. 335
      • [2] WINDOW WASHER RELATED — p. 336
        • (1) Wiper Switch — p. 336
        • (2) Wiper Motor — p. 337
        • (3) Washer Motor — p. 338
      • [3] LIGHTING EQUIPMENT RELATED — p. 339
    • 4. REMOVAL AND INSTALLATION OF GLASS — p. 341
      • [1] PREPARATION — p. 341
      • [2] REMOVING GLASS — p. 341
      • [3] INSTALLING WINDOWS — p. 342
      • [4] GLASS TRIM TYPE — p. 343
    • 5. TROUBLESHOOTING — p. 344
• ELECTRICAL WIRING DIAGRAM — p. 346
• ELECTRICAL CIRCUIT DIAGRAM — p. 347

Capabilities

The source outline separates mechanism explanations from servicing instructions for Hydraulic System. Use these indexed headings to locate the applicable system in the source PDF, then confirm model-specific notes, specifications, illustrations, and operating conditions at the relevant page before carrying out service work.

Keep the source's safety sequence, prerequisite steps, labels, units, configuration notes, and footnotes with the selected task; do not apply an isolated value outside the conditions stated in the manual.

Technical reference

Reference tables include fluid and system capacities and speed ratings for service checks, adjustment work, and specification lookup. Use the values and conditions in the PDF for the applicable model and procedure.

• Fluid reference: fluid and system capacities.
• Machine specifications: speed ratings.

Delivery

This manual is supplied as a digital PDF file and is available for instant download after purchase. No physical media is shipped.

References

Kubota Workshop Manual for Excavator, document code RY911-21920, PDF edition.