Kubota U45-3α, KX121-3α, U50-3α, KX161-3α, U45S, U45ST, KX121-3S, KX121-3ST, U45-3S, U45-3ST, KX161-3S, and KX161-3ST Workshop Manual — 97899-61530

About this manual

Kubota published this Workshop Manual for the U45-3α, KX121-3α, U50-3α, KX161-3α, U45S, U45ST, KX121-3S, KX121-3ST, U45-3S, U45-3ST, KX161-3S, and KX161-3ST 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

Models

U45-3α, KX121-3α, U50-3α, KX161-3α, U45S, U45ST, KX121-3S, KX121-3ST, U45-3S, U45-3ST, KX161-3S, and KX161-3ST

Document number

97899-61530

Publication year

2009

Language

English

Page count

1210

Product highlights

Electrical systems

The manual includes wiring diagrams and electrical troubleshooting.

Hydraulic systems

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

Diagnostics

The manual includes diagnostic service-mode information.

Specifications and settings

The manual includes reference information for torque specifications, wear limits, pressure specifications, and dimensions.

Special tools

A special-tools section is included.

Manual contents

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

• I. GENERAL — p. I-S-1
  • (A) BODY AND ENGINE IDENTIFICATION MARKS — p. I-S-3
  • a) Safety Measures before Starting Work — p. I-S-5
  • b) Safety Measures during Work — p. I-S-5
  • Preparation for Disassembly — p. I-S-6
  • d) Precautions for Disassembly and Reassembly — p. I-S-6
  • e) Maintenance — p. I-S-7
  • Waste Disposal — p. I-S-7
  • (C)IMPORTANT SAFETY PROCESS AND CRITICAL FUNCTIONAL PROCESS — p. I-S-9
  • a) Essential Adhesives — p. I-S-9
  • b) Important Safety Process — p. I-S-9
  • Important Critical Functional Process — p. I-S-9
  • (D)IMPORTANT INSPECTION ITEMS AFTER REASSEMBLING — p. I-S-11
  • (E) SERVICING FUNDAMENTALS — p. I-S-13
  • a) Items for Servicing — p. I-S-13
  • b) O-ring, Oil Seal, Circlip and Roll Pin — p. I-S-15
  • Piping — p. I-S-17
  • (F) MAINTENANCE INTERVALS — p. I-S-25
  • a) EU-version — p. I-S-25
  • b) KTC, KCL-version — p. I-S-26
  • KTA-version — p. I-S-28
  • d) Hydraulic Oil Check for Machines with Hydraulic Breakers — p. I-S-29
  • e) Periodic Replacement of Important Parts — p. I-S-30
  • Water and Oil Quantity — p. I-S-31
  • g) Recommended Oil — p. I-S-32
  • h) Filters — p. I-S-33
  • (G)PRODUCT FEATURE — p. I-S-35
  • a) Quick Chart — p. I-S-35
  • b) Comparison of Main Specifications for U45S — p. I-S-37
  • New Engineering Points — p. I-S-37
  • d) Photos of Main Modified Parts — p. I-S-38
  • e) Major Specifications Incorporated — p. I-S-39
  • Major Points Incorporated in Minor Change — p. I-S-40
  • (H)MACHINE QUALITY SPECIFICATIONS — p. I-S-43
  • a) KX121-3S, 161-3S, U45S, U45-3S: KTC, KCL, KTA-version — p. I-S-43
  • b) U50-3, KX121-3, KX161-3, U45-3, KE, KDG, KUK-version — p. I-S-50
  • KX121-3S, 161-3S, U45S: KTC, KCL, KTA-version — p. I-S-58
  • d) Traveling Performance — p. I-S-67
  • e) Major Components Comparison — p. I-S-68
• II. MACHINE BODY — p. II-S-1
• III. ENGINE — p. III-M-1
  • Mechanism Section — p. III-M-1
  • Service Section — p. III-S-1
• IV. HYDRAULIC SYSTEM — p. IV-M-1
  • Mechanism Section — p. IV-M-1
  • Service Section — p. IV-S-1
• V. ELECTRICAL SYSTEM — p. V-M-1
  • Mechanism Section — p. V-M-1
  • Service Section — p. V-S-1
• VI. OPTIONAL UNIT: AIR CONDITIONER — p. VI-M-1
  • Mechanism Section — p. VI-M-1
  • Service Section — p. VI-S-1
• VII.OPTIONAL UNIT: ANGLE DOZER — p. VII-S-1

Capabilities

The source outline indexes disassembly and assembly, maintenance tasks, servicing instructions, checking and adjustment, and mechanism explanations. 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 torque settings, wear limits, and dimensions for service checks, adjustment work, and specification lookup. Use the values and conditions in the PDF for the applicable model and procedure.

• Service limits and settings: torque settings and wear limits.
• Machine specifications: dimensions.

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 97899-61530, PDF edition.