Kubota U20-3/U25-3 Workshop Manual | 97899-60740

About this manual

Kubota published this Workshop Manual for the U20-3 and U25-3 excavator models. It brings the documented service and technical-reference material for those named excavators into a single publication.

The manual is especially useful for work that crosses electrical and hydraulic systems: it includes electrical troubleshooting, alongside hydraulic diagrams, pressure-test evidence, and valve-adjustment information.

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

Equipment type

Excavator

Models

U20-3 and U25-3

Document number

97899-60740

Language

English

Page count

508

Product highlights

Electrical systems

The manual includes electrical troubleshooting and pinouts.

Hydraulic systems

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

Specifications and settings

The manual includes reference information for pressure specifications.

Special tools

A special-tools section is included.

Maintenance

The manual includes a maintenance schedule.

Applicability and key coverage

Named models: U20-3 and U25-3.

Separate Mechanism and Service sections cover Machine body, Engine, Hydraulic system, and Electrical system.

Manual contents

The contents below retain the source sections and independent subsections in order. Detailed procedures are listed within those subsections in the PDF.

• I. General — p. 5
  • A.Body and engine identification marks — p. 7
  • B.Safety precautions for servicing, disassembly and reassembly — p. 8
  • C.IMPORTANT SAFETY PROCESS AND CRITICAL FUNCTIONAL PROCESS — p. 10
  • D.IMPORTANT INSPECTION ITEMS AFTER REASSEMBLING — p. 10
  • E.SERVICING FUNDAMENTALS — p. 11
  • F. Maintenance intervals — p. 28
• II. Machine body (Mechanism section) — p. 31
  • A.Specifications — p. 33
  • B.Components interchangeability — p. 35
  • C.Machine structure — p. 36
• II. Machine body (Service section) — p. 49
  • A.Specifications — p. 51
  • B.Front attachment — p. 62
  • C.Upper structure — p. 72
  • D.Cab canopy installation — p. 87
  • E. Under carriage — p. 94
• III.Engine — p. 115
  • A.05-M Series Engine WSM — p. 117
• III.Engine (Mechanism section) — p. 125
  • A.Feature — p. 127
  • B.Engine body — p. 128
  • C.Lubricating system — p. 132
  • D.Cooling system — p. 135
  • E.Intake / exhaust system — p. 138
  • F. Fuel system — p. 139
  • G.Electrical system — p. 147
  • H.Turbo charger system — p. 148
• III.Engine (Service section) — p. 153
  • A.Engine mount on the machine — p. 155
  • B.General — p. 162
  • C.Engine body — p. 191
  • D.Lubricating system — p. 225
  • E.Cooling system — p. 227
  • F. Fuel system — p. 230
  • G.Electrical system — p. 235
  • H.Turbo charger system — p. 245
• IV.Hydraulic system (Mechanism section) — p. 249
  • A.Features of hydraulic system — p. 251
  • B.Hydraulic system specifications — p. 252
  • C.Main pump — p. 253
  • D.Control valve — p. 257
  • E.Pilot valve — p. 278
  • F. Swing motor — p. 284
  • G.Rotary joint (Swivel joint) — p. 288
  • H.Travel motor U20-3 (Fujikoshi) — p. 290
  • I. Hydraulic circuit diagram — p. 311
• IV.Hydraulic system (Service section) — p. 315
  • A.Troubleshooting — p. 317
  • B.Specifications — p. 333
  • C.Testing — p. 344
  • D.Disassembling and Assembling — p. 358
• V. Electrical system (Mechanism section) — p. 459
  • A.Components & harness layout — p. 461
  • B.Function of main circuit — p. 462
• V. Electrical system (Service section) — p. 477
  • A Wire harness installation — p. 479
  • B Troubleshooting — p. 487

Capabilities

The source outline indexes servicing instructions, disassembly and assembly, checking and adjustment, maintenance tasks, mechanism explanations, and troubleshooting. Use these source-backed headings to locate the applicable task or 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 pressure specifications for service checks, adjustment work, and specification lookup. Use the values and conditions in the PDF for the applicable model and procedure.

• Pressure reference: pressure specifications.

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 97899-60740, PDF edition.