Part of the Kubota Operator Manuals.
This is the operator manual for the Kubota U25 and U25-3S compact excavator, powered by the Kubota D1105-E3 diesel engine. Across 85 pages it walks owners and operators through safe operation, daily and interval maintenance, machine controls, and the reference data needed to keep the machine working.You get the full sequence for running the excavator: starting the engine, reading the warning lamps and LCD display, using the Two Pattern Selection System, and operating the boom, arm, bucket, and dozer. The maintenance sections cover engine oil and filter changes, hydraulic filter service, track adjustment, and fuse locations.The manual also includes transport and lifting procedures, cold-weather and long-storage guidance, a troubleshooting chart, and specification tables for capacities, main dimensions, and lifting performance. It is a downloadable PDF you can read on any device or print for the shop.
What's Inside This Kubota U25, U25-3S Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| List of Abbreviations | 2 | Api, Astm, Cece, Din, En, Front |
| General Symbols | 3 | Safety Alert Symbol, Alarm Lamps, Operation Directions, Read Operator's Manual |
| Foreword and Safety First | 4 | Excavator Introduction, Safety Alert Symbol, Danger, Warning, Caution Definitions |
| Safe Operation | 9-19 | Before Operation, Starting of the Excavator, After Operation, Safe Loading and Transport, Danger/Warning/Caution Labels |
| Machine Overview (Dealer Service, Technical Data, Parts, Controls) | 21-25 | Serial Numbers, Engine Specifications, Machine Components, Instrument Panel, Control Levers |
| Pre-Operation Checks | 26-29 | Daily Checks, Seat Adjustment, Opening/Closing Parts, Safety Devices, ROPS/OPG |
| Engine Operation | 30-35 | Starting the Engine, Display Selector Switch, Warning Lamps, Cold Weather Starting, Stopping the Engine, Auxiliary Battery |
| Excavator Operation | 36-45 | Running-In, Adjusting Seat, Lock Lever, Two Pattern Selection System, Boom/Arm/Bucket/Dozer Operation, Driving, Turns, Parking |
| Transport and Lifting | 46-49 | Loading on Truck, Securing, Lifting Procedure, Tackle, Max Load |
| Maintenance | 50-56 | Maintenance Schedule, Lubrication Chart, Oil Level Checks, Grease Points, Filter Locations |
| Regular Checks and Maintenance Work | 57-69 | Engine Oil Change, Fuel Filter, Air Filter, Hydraulic Filter, Track Tension Adjustment, Fuses |
| Other Adjustments and Replacements | 70-73 | Bucket Tooth Replacement, Blade Adjustment, Slew Ring Lubrication, Belt Inspection |
| Troubleshooting | 74-76 | Engine, Hydraulic System, Drive System, Kubota I.C.S. Messages, Service Hour Meter |
| Environmental Operations and Storage | 77-79 | Cold Weather Preparation, Post-Operation Procedures, Long Storage, Periodic Component Replacement |
| Reference Data (Oils, Dimensions, Capacity, Specs) | 80-85 | Recommended Oils, Main Dimensions, Lifting Capacity Tables, Engine Output, Hydraulic Flow, Operating Weight |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Hydraulic hose replacement interval | Every 2 years or 4000 hours | p. 79 |
| Fuel hose replacement interval | Every 2 years or 4000 hours | p. 79 |
| Air filter element (Outer element) cleaning interval | every 200 hrs | p. 50 |
| Air filter element (Outer element) replacement interval | every 1000 hrs | p. 50 |
| Engine oil filter replacement interval | every 250 hrs | p. 50 |
| Coolant change interval | every 2 years | p. 50 |
| Radiator capacity | 2.4 L | p. 69 |
| Hydraulic oil change interval | every 1000 hrs | p. 50 |
| Hydraulic tank capacity | 22.5 L | p. 66 |
| Operating weight (including operator's) | 2550 kg | p. 22 |
| U25 | ||
| Engine power SAE gross | 15.5 kW | p. 22 |
| U25-3S | ||
| Engine Output (SAEJ 1995 gross) | 20.9 HP | p. 85 |
Kubota U25, U25-3S Common Problems This Manual Covers
Machine feels tippy at full reach
On the zero-tail-swing U25 layout, stability drops as the boom and bucket are extended far out, and the machine can feel unstable on uneven ground. The operating section explains load handling, driving, and the controls that keep the excavator steady.
Manual Section: Excavator Operation p. 36Hydraulic leaks or weak performance
Worn hoses, loose fittings, or degraded hydraulic oil show up as leaks, overheating, or sluggish digging. The maintenance section covers hydraulic filter service, fluid checks, and the inspection points that catch these faults early.
Manual Section: Maintenance and Adjustments p. 50Engine overheating during work
Low coolant, blocked airflow around the cooling components, or working before the engine has cooled can drive temperatures up. The troubleshooting chart walks through engine and cooling symptoms and what to check first.
Manual Section: Troubleshooting p. 74Warning lamps or indicators not clearing
Damaged or loose wiring and connectors cause intermittent lamps and erratic display behaviour. The troubleshooting section lists the KUBOTA I.C.S. messages and the electrical symptoms to trace.
Manual Section: Troubleshooting p. 74Hard starting in cold weather
Diesel engines start harder in the cold, and skipping the correct glow and warm-up steps makes it worse. The engine section covers cold-weather starting, the display selector switch, and the checkpoints to run after start.
Manual Section: Engine Operation p. 30Reduced digging power from a clogged air filter
A dirty air cleaner element chokes the engine and cuts performance, and missed fluid checks compound the problem. The maintenance section gives the cleaning and replacement intervals and the daily checks to stay ahead of it.
Manual Section: Maintenance and Adjustments p. 50Frequently Asked Questions
Which machines does this manual cover?
It covers the Kubota U25 and U25-3S compact excavator with the Kubota D1105-E3 diesel engine. It is the operator manual, focused on running, maintaining, and troubleshooting the machine rather than full teardown repair.
Where do I find engine starting and warning lamp procedures?
The Engine Operation section covers starting the engine, cold-weather starting, the display selector switch, and the warning lamps, so you can read the machine's status correctly before and during work. p. 30
Does it include maintenance intervals and fluid capacities?
Yes. The Maintenance and Adjustments section lists maintenance intervals, engine oil and fuel filter changes, hydraulic filter service, track adjustment, and fuses, with capacities detailed in the reference data tables. p. 50
Does it help with troubleshooting?
Yes. The Troubleshooting section covers engine, hydraulic, and drive-system symptoms plus the KUBOTA I.C.S. messages and service hour meter, giving you a starting point when something goes wrong. p. 74
What format is this manual in?
An 85-page Operator Manual in searchable PDF, ready the moment your checkout completes. Read it on a computer, tablet, or phone, with no shipping wait.
Am I able to print pages from this manual?
Yes. The PDF carries no DRM, so you can print any page or section your shop needs. It works with any standard printer.
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