This is the factory Kubota Workshop Manual for the KX018-4 mini excavator, covering the D902-E3-BH-3 and D902-BH-2 diesel engines in 349 pages. It is organized into General, Mechanism, and Service sections, so you can understand how each system works before you troubleshoot, disassemble, or reassemble it.The manual details the machine body and front equipment, the D902 engine, the complete hydraulic system with its pumps, control valve, swivel and travel motors, and cylinders, plus the electrical system, cab, and full wiring and circuit diagrams. Torque tables, oil and coolant capacities, and maintenance intervals are all included.With this PDF you can diagnose a crank-no-start, restore slow or weak boom and travel functions, service the hydraulics, or trace a wiring fault. Download it instantly and print the pages you need in the shop.
What's Inside This Kubota KX018-4 Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | - | - |
| General | - | Machine Indentification, Engine Indentification (Model and Engine Serial Number) |
| Machine Body | - | Front Equipment (Bucket Installation and Removal, Attachment and Removal, Blade Removal and Mounting) |
| Engine | - | Engine Specifications, Performance Curve (D902-E3-Bh-3, D902-Bh-2), Dimensions (Component Layout) |
| Hydraulic System | - | Diagram of Hydraulic Circuit, Hydraulic Device Layout, Pump (Specifications, Components, Function and Structure, Operating Principles, Horsepower Control Mechanism) |
| Electrical System | - | Electronic Equipment Layout |
| Cabin | - | Cabin Removal and Mounting, Heater Removal and Installation |
| Electrical Wiring Diagram (KX018-4 Na, Au) | - | Overall Wiring Diagram, Component Connections, Circuit Paths |
| Electrical Circuit Diagram (KX018-4 Na, Au) | - | Overall Circuit Diagram, Electrical Components, Power Distribution |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| General Use Nuts and Bolts (M6, No-grade or 4T) Torque | 7.9 to 9.3 N·m | p. 31 |
| Lever Lock Solenoid Resistance | 12 Ω ± 10 % | p. 309 |
| Engine Stop Solenoid Holding Coil Resistance | 22.2 Ω | p. 262 |
| Fuel Filter Cartridge Replacement Interval | every 500 hrs | p. 36 |
| Fuel Injection Pressure | 13.73 MPa | p. 88 |
| Hydraulic Return Filter Element Replacement Interval | every 500 hrs | p. 36 |
| Hydraulic Suction Filter Element Replacement Interval | every 1000 hrs | p. 36 |
| Air Filter Outer Element Replacement Interval | every 1000 hrs | p. 35 |
| Hydraulic Hose Fittings Torque (DN 4 - 1/8, M12 x 1.5) | 15 to 20 N·m | p. 32 |
| Hose Clamp Screw Torque (10-16) | 2.5 to 3.5 N·m | p. 33 |
| Machine weight (Canopy type) | 1620 kg | p. 17 |
| Engine Total displacement | 898 cm³ | p. 17 |
Kubota KX018-4 Common Problems This Manual Covers
Engine cranks but will not start
A mini excavator that cranks without starting is often a bumped kill switch, a fuel shutoff issue, or a wiring fault. The electrical system chapter covers the lever lock and engine stop solenoids and the checks to isolate them.
Manual Section: Electrical System p. 240Hard starting with gray or white smoke
Difficult starting with smoke usually means poor injector atomization or low fuel supply pressure. The engine chapter lists the injection pressure and related fuel-system specifications.
Manual Section: Engine p. 86Boom, bucket and travel move slowly
Slow or weak functions point to hydraulic flow restriction, low oil, a control valve issue, or weak pump output. The hydraulic system chapter documents the pump, control valve, and performance measurement.
Manual Section: Hydraulic System p. 92Unstable idle or stalling
An idle that hunts or stalls when decelerating often comes from air in the fuel circuit or uneven injection supply. The engine chapter covers the fuel system checks needed to diagnose it.
Manual Section: Engine p. 86Worn front pins and bushings
Play in the front equipment usually means worn pins and bushings on the bucket, arm, or blade linkage. The machine body chapter lists the front pin and bushing dimensions and removal procedures.
Manual Section: Machine Body p. 53Leaks and loose hardware at daily check
Daily inspection concerns center on leaks, low fluid levels, loose hardware, and clogged radiator or air intake screens. The general chapter provides the maintenance intervals and capacity tables.
Manual Section: General p. 19Frequently Asked Questions
Which machine does this manual cover?
It covers the Kubota KX018-4 mini excavator, including the D902-E3-BH-3 and D902-BH-2 diesel engines used across the North American and Australian versions.
Are wiring diagrams included?
Yes. The manual includes the overall Electrical Wiring Diagram and Electrical Circuit Diagram for the KX018-4, plus the electrical system servicing chapter. p. 347
Does it list torque specifications?
Yes. The General section's Torque Specification Table gives values for general nuts and bolts, hydraulic hose fittings, and hose clamp screws. p. 31
How much hydraulic detail does it include?
The Hydraulic System section covers the pump, control valve, swivel and travel motors, and cylinders, with function, structure, and performance measurement. p. 92
What format is this manual in?
Immediate download of the complete 349-page searchable Service Manual. Open it on any device, laptop at your desk or phone in the field.
Can I print this manual?
Yes. The PDF carries no DRM restrictions, so print any page or section you need for the shop. Works with any standard printer.
Does this Kubota KX018-4 Service Manual cover the hydraulic system?
Yes, this Kubota KX018-4 Service Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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