Name: Kubota u15-3
Brand: Kubota
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WORKSHOP MANUAL

KUBOTA EXCAVATOR

U15-3

Code No.97899-61270

Table of Contents5
Product Engineering Section5
Developing Concept and Feature7
Main Specifications7
Objective and Concept of Development7
Major Selling Points and Improvements8
- Product View8
- Engine Start Control, Travel Lock Function10
Evaluation of Competitive Power with Competitors12
- Operability13
- Outline of Hydraulic System (Travel Straight Function)14
- Working Range14
Actual Performance Comparison15
Machine Specifications16
Major Dimensions and Working Range (with Rubber Crawler16
Dimensional Drawings17
Performance and Lifting Capacity18
- Lifting Capacity19
- Service Engineering Section21
- List of Oil and Water Quantities23
- Maintenance Specifications23
Tightening Torque24
Quality Specifications26
Operating Noise31
- Machine Weight and Parts Weight32
- Machine Body Structure and Function33
Overall Arrangement33
- Arrangement of Control Levers34
- Adoption of Meters35
- Press-Fitting of Bushes38
- Front Equipment39
- Greasing40
- Cleaning and Greasing the Track Frame Slide Pipes42
- Bucket Dimensions43
Front Attachment43
- Bucket Fixture Dimensions44
- Bucket Link Pin45
- Front Pins and Bush46
- Swing Bracket47
Control Levers and Linkage48
- Lever Strokes and Operating Forces48
- Accelerator Lever49
- Dozer Lever50
- Dozer Cables (Route)51
- Swing Pedal52
- Swivel Bearing54
Under Carriage Components54
- Truck Frame (Adjustment of Play)55
- Structure of Track Roller56
- Tension Device57
- Idler and Tension Spring58
- Idler and Sprocket59
- Rubber Track60
- Track Shoe61
- Iron Track Shoe62
- Dozer63
C.engine64
- Engine Specifications64
- Engine Performance Curves65
Engine Electrical Data66
Engine Servicing Data67
Engine Mount68
- Fuel System69
- Route of Fuel Hose69
Fuel System70
- Fuel Tank71
- Cooling System Structure72
- Radiator Specifications73
Air Cleaner74
Hydraulic System75
Main Pump75
- Pump Coupling75
- Pump Hose Adapter76
- P-Q Performance Curve78
- Discharge Rate79
- Pump Specifications79
- Pump Function80
- Control Valve81
- Relief Valve Specifications81
Control Valve83
Control Valve Sectional View86
Swivel Motor89
- Swivel System Specifications89
- Cross-Sectional View of Swivel Motor91
- Swivel Motor Fittings92
- Travel Motor (Wheel Motor)93
- Travel Performance Specifications95
- Piston Motor Installation96
- Piston Motor Structure97
- Operating Principle of Wheel Motor98
- Hydraulic Motor100
- Operating Principle of Two-Speed Motor101
- Hydraulic Valve (Counter Balance Valve)102
- Pilot Valve (Remote Control Valve)103
- Adaptors106
- Cylinder Speed107
Cylinders107
- Specifications and Part Codes of Boom, Arm, Bucket and Swing Cylinder108
- List of Cylinder Dimensions109
- Cylinders’ Section View110
- Swivel Joint (Rotary Joint)112
- Route of Hose (Travel, Dozer)114
- Route of Hose (Truck Cylinder Hose)115
Unload Valve116
Adaptor Installation117
Selector Valve118
Accessaries of Hydraulic Compornents119
- Check Valve Assy119
- Hydraulic Filter119
- Oil Tank120
- Oil Cooler121
- Accumulator122
- Hydraulic Pressure Hose Circuit (High-Pressure)123
Hydraulic System Flow123
- Hydraulic Pressure Hose Circuit (Low-Pressure)124
- Travel Unloading Function125
- Boom Confluence126
- Service Port Confluence126
- Straight Travel Circuit127
Service Port System128
1-Way or 2-Way Valve129
Hydraulic Components Layout : U15-3131
Hydraulic Circuit Diagram132
Electrical System133
New Functions of Electric System133
Battery Circuit134
Key Switch (Engine Starter Switch)135
Safty Lever Lock Switch136
Safety Lever Lock Circuit Malfunction137
Solenoid Valve138
- Construction and Principle of Circuit Tester139
- Solenoid Test Method139
Travel Hi-Speed Control Circuit140
- Troubleshooting: Travel Hi-Speed Malfunction140
- Testing Hi - Low SW141
- Hi - Low Self Hold Circuit142
Meter Panel147
- Warning Lamps Indication148
- Meter Structure149
- Meter Panel Circuit Diagram150
- Fuel Gauge Coil Resistance Test152
- Hour Meter Function Test LED and Stepping Motor Function Check152
- Replacing Fuses153
- Slow Blow Fuse153
Auto Glow Circuit154
- Auto Glow Control Circuit Diagram156
- Auto Glow Controller160
Auto Release Control System164
- Key SW to Engine Start Position166
- Key SW to AC Position167
- When the Key SW Is Stucked at the Start Position168
- Key to the Start Position While Engine Is Running169
- Auto Release and Auto Glow Circuit Combined170
Water Temp. Sensor & Gauge171
Water Temp. Sensor Circuit Malfunction171
Fuel Control Circuit173
Engine Stop Solenoid174
Engine Stop Solenoid175
Coil Commander176
Fuel Sensor178
Engine Oil Pressure Sensor Circuit181
Oil Switch181
Engine Electrical System182
Engine Oil Pressure Failure182
Horn Circuit184
- Current Flow185
- Charging System (Alternator)187
- Charging System Malfunction189
- Relays191
- Structure of Relay192
- Checking Relays193
Route of Electric Wiring194
Electrical Component Layout201
Electric Circuit202
Electrical Diagrams202
Electrical Wiring Diagram207
Conversion Tables209

Brand	Kubota
Model	u15-3
Category	Excavators
Language	English

Kubota u15-3 User Manual

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