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Kubota U20-3, U25-3 Excavator Workshop Repair Manual

Kubota U20-3, U25-3 Excavator Workshop Repair Manual

$33.00

🚜 Equipment
Brand	Kubota
Type	Excavator
Model	U20-3, U25-3
📄 Documents
Type	Repair Manual
Publication	97899-61970
Language	English
Format	PDF
No of Pages	740

The Kubota U20-3 and U25-3 Mini Excavators are compact, high-performance machines designed for efficiency, durability, and maneuverability in tight work areas. Featuring Kubota’s zero-tail swing design, both models allow safe operation close to walls or obstacles without compromising on digging performance. With reliable Kubota diesel engines and robust hydraulic systems, these excavators deliver the power and control needed for construction, utilities, and landscaping projects.

The U20-3 is equipped with a 19 PS (13.5 kW) engine and has an operating weight of approximately 2,180–2,380 kg, depending on canopy or cab configuration. It achieves a digging depth of about 2.54 m and a reach of 4.26 m, with an adjustable track width ranging from 1,300 mm to 1,500 mm, ensuring both stability and accessibility in confined spaces. The U25-3, with an operating weight of around 2.5 tonnes, is powered by a 20.9 hp engine, providing a maximum digging depth of 2.81 m and a reach of 4.67 m. With a fixed width of 1,500 mm, the U25-3 offers added lifting and digging capacity while maintaining compact dimensions for transport and operation.

The workshop repair manual provides complete technical coverage of both models, including general safety, routine maintenance, servicing of the machine body, engine, and hydraulic systems, as well as detailed disassembly and assembly instructions. It also covers control valves, pumps, travel and swing motors, swivel joints, and full electrical system diagnostics. Included are wiring diagrams, hydraulic schematics, torque specifications, lubrication intervals, troubleshooting guides, and performance testing procedures. This ensures accurate servicing, minimizes downtime, and extends machine life.

Key Highlights

Kubota U20-3: ~2.2–2.38 t operating weight, 19 PS (13.5 kW) engine, 2.54 m digging depth, 4.26 m reach
Kubota U25-3: ~2.5 t operating weight, 20.9 hp engine, 2.81 m digging depth, 4.67 m reach
Zero-tail swing design for safe, efficient operation in confined spaces
U20-3: Adjustable track width (1,300–1,500 mm) for access and stability
U25-3: Fixed width 1,500 mm, providing greater lifting and digging performance
Auxiliary hydraulics for attachment versatility (U20-3: ~35.8 L/min flow)
ROPS/TOPS cab with ergonomic operator layout for comfort and safety
Workshop manual covers engine, hydraulics, electrics, swing/travel motors, and control systems
Includes hydraulic and electrical schematics, torque specifications, lubrication charts, and troubleshooting flowcharts
Designed for reliability, efficient service, and long-term durability in demanding applications

Table of Content

📙 Table of Contents

I. General
A. Body and engine identification marks…………………………………………………………………………………. I-2
B. Safety precautions for servicing, disassembly and reassembly………………………………………….. I-3
a. Safety measures before starting work …………………………………………………………………… I-3
b. Safety measures during work ………………………………………………………………………………. I-3
c. Preparation for disassembly ………………………………………………………………………………… I-4
d. Precautions for disassembly and reassembly…………………………………………………………. I-4
C. IMPORTANT SAFETY PROCESS AND CRITICAL FUNCTIONAL PROCESS……………….. I-5
a. Essential Adhesives……………………………………………………………………………………………. I-5
b. Important Safety Process ……………………………………………………………………………….. I-5
c. Important Critical Functional Process ……………………………………………………………….. I-5
D. IMPORTANT INSPECTION ITEMS AFTER REASSEMBLING………………………………………….. I-5
E. SERVICING FUNDAMENTALS …………………………………………………………………………………I-6
a. Items for Servicing ……………………………………………………………………………………………… I-6
b. O-ring, Oil seal, Circlip and Roll Pin………………………………………………………………………. I-8
c. Piping ……………………………………………………………………………………………………………… I-10
d. Machine Quality Specifications ……………………………………………………………………………………. I-15
F. Maintenance intervals ……………………………………………………………………………………………. I-23
a. Maintenance intervals chart ……………………………………………………………………………….. I-23
b. Hydraulic Oil Check for machines with Hydraulic Breakers …………………………………….. I-24
c. Periodic replacement of important parts ………………………………………………………………. I-25

U20-3, U25-3
Your KUBOTA dealer is always ready to help so that your excavator offers the best performance. After having carefully read this manual, you will realize that much of the routine maintenance can be done by yourself. Machines must be disassembled and assembled efficiently and safely. It is very important to thoroughly understand the construction and function of the machine, to make all appropriate preparations, and start operations according to the specified working procedures in this workshop Repair manual.

Specification

Specification	Kubota U20-3α / U20-3 Mini Excavator	Kubota U25-3 / U25-3S Mini Excavator
Operating Weight	≈ 2,380 kg (cab); ≈ 2,180 kg (canopy) :contentReference[oaicite:0]{index=0}	≈ 2.5 t (≈ 5,625-5,900 lb) :contentReference[oaicite:1]{index=1}
Engine Power	19 ps / 13.5 kW :contentReference[oaicite:2]{index=2}	≈ 20.9 hp :contentReference[oaicite:3]{index=3}
Maximum Digging Depth	≈ 2,540 mm :contentReference[oaicite:4]{index=4}	≈ 2,810 mm :contentReference[oaicite:5]{index=5}
Transport Width / Track Gauge	1300-1500 mm (adjustable track width) :contentReference[oaicite:6]{index=6}	≈ 1,500 mm width :contentReference[oaicite:7]{index=7}
Maximum Reach / Digging Radius	≈ 4,260 mm :contentReference[oaicite:8]{index=8}	≈ 4,670 mm :contentReference[oaicite:9]{index=9}
Auxiliary Hydraulic Flow	≈ 35.8 L/min @ 21.6 kgf/cm² :contentReference[oaicite:10]{index=10}	Not clearly specified in source found :contentReference[oaicite:11]{index=11}

Buyer Questions & Answers

Frequently Asked Questions❔

Are the manuals OEM (Original Equipment Manufacturer)?

Yes, we only provide manuals that are sourced from the machine manufacturer or authorized dealers.

What file format are the manuals in?

All manuals are provided in PDF format, which you can be open on your browser, computer, smartphone, or tablet.
Printed versions are available for select manuals — check the product page or contact us for availability.

Is the manual printable?

Yes, all pages are printable.

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