Part of the Kubota Repair Manuals.
This Kubota Workshop Manual covers the LA271, LA301, LA351, LA401, LA272, LA302, LA352, and LA402 front loaders in 62 pages. Unlike an operator handbook, this is the factory service manual, split into a Mechanism half that explains how the loaders work and a Servicing half for troubleshooting and repair.The Mechanism section details the hydraulic circuit, the control valve assemblies for each model group, the relief valve, and the boom and bucket cylinders. The Servicing section covers general maintenance, a full troubleshooting guide, servicing specifications, allowable wear limits, and complete tightening torque tables.This is the manual to reach for when a loader drifts down, will not hold position, or loses lift power, and you need seal, valve, and torque figures to fix it properly. It downloads as a PDF and prints on demand, so you can keep the relevant pages at the bench.
What's Inside This Kubota LA271–LA402 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Instructions | 4-7 | Safety First, Danger, Warning, Caution, Important, Note, Before Servicing and Repairing, Safety Starting |
| Terminology | 8 | Front Loader Overview, Bucket Cylinder, Boom, Hydraulic Control Valve, Side Frame, Mounting Pin, Main Frame, Bucket |
| Specifications | 9-12 | Loader Specifications, Bucket Specifications, Operating Dimensions, Performance Ratings (No Load) |
| Features | 15 | Front Loader Features, Loader Attachment Points, Bucket Control |
| Hydraulic Circuit | 16 | 3-Position Bucket Control Valve, 4-Position Bucket Control Valve, Boom Cylinders, Relief Valve, Fluid Routing |
| Control Valve Assembly | 17-36 | Control Valve Assembly LA271 LA301 LA351, Control Valve Assembly LA401 LA272 LA302 LA352 LA402, Valve Disassembly, Valve Inspection, Valve Assembly |
| Relief Valve | 37-38 | Relief Valve Disassembly, Relief Valve Inspection, Relief Valve Assembly, Pressure Setting |
| Boom Cylinder and Bucket Cylinder | 39-40 | Boom Cylinder Disassembly, Bucket Cylinder Disassembly, Piston Mounting Nut Torque Specification |
| Servicing | 41-62 | Identification, Lubricants, Maintenance Check List, Check and Maintenance, Check Points of Each Use or Daily, Check Points of Every 10 Hours, Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| LA271, LA301, LA351, LA272, LA302, LA352 | ||
| Boom and bucket cylinder piston mounting nut | 170 to 183 N-m (125 to 135 ft-lbs) | p. 48 |
| Brace mounting bolt and nut | 135 N-m (100 ft-lbs) | p. 48 |
| All Models | ||
| Control valve cover mounting bolt | 23.1 to 25.7 N-m (17 to 19 ft-lbs) | p. 48 |
| Control valve mounting bolt | 12.2 to 13.6 N-m (9 to 10 ft-lbs) | p. 48 |
| Connecting bar mounting bolt and nut | 147 N-m (108 ft-lbs) | p. 48 |
| Control valve stay mounting bolt and nut | 83 N-m (61 ft-lbs) | p. 48 |
| Front guard mounting bolt and nut | 83 N-m (61 ft-lbs) | p. 48 |
| Main frame mounting bolt (M14) | 147 N-m (108 ft-lbs) | p. 48 |
| LA401, LA402 | ||
| Boom and bucket cylinder piston mounting nut | 122 to 135 N-m (90 to 100 ft-lbs) | p. 48 |
| Brace mounting bolt and nut | 147 N-m (108 ft-lbs) | p. 48 |
| LA271, LA272, LA351, LA352, LA401, LA402 | ||
| Relief Valve Setting Pressure (High Flow Models) | 13.1 to 13.8 MPa | p. 47 |
| LA301, LA302 | ||
| Relief Valve Setting Pressure (Standard Flow Models) | 14.5 to 15.2 MPa | p. 47 |
Kubota LA271–LA402 Series Common Problems This Manual Covers
Loader will not raise, lower, or curl
A hydraulic fault such as low fluid, air in the system, a clogged strainer, a sticking control valve, or failed cylinder seals can stop the loader responding. The servicing section provides the troubleshooting chart to isolate the cause.
Manual Section: Servicing p. 41Loader drifts down with the engine off
Internal leakage past the lift cylinder seals or control valve lets the boom settle on its own. The mechanism section details the cylinders, control valve, and relief valve behind this fault.
Manual Section: Mechanism p. 13Weak, slow, or jerky loader movement
Insufficient flow or pressure, contaminated fluid, or a partial blockage makes the loader sluggish or jerky. The servicing troubleshooting guide walks through checking pressure, flow, and the hydraulic supply.
Manual Section: Servicing p. 41Loader will not hold position under load
Worn cylinder seals or a worn valve spool let the arm or bucket creep down under weight. The mechanism section covers the control valve and cylinder construction so you can judge wear.
Manual Section: Mechanism p. 13Hydraulic oil leaks at fittings or cylinders
Aging seals, loose fittings, or cracked hoses show up as oil at the cylinders and valve body. The servicing section includes the tightening torque tables for the fittings and mounting hardware.
Manual Section: Servicing p. 41Excessive play at loader pins and bushings
Worn pins and bushings create rattle and poor alignment at the arms and bucket. The servicing section lists allowable wear limits and the maintenance checks for these parts.
Manual Section: Servicing p. 41Frequently Asked Questions
Which models does this workshop manual cover?
It covers the Kubota LA271, LA301, LA351, LA401, LA272, LA302, LA352, and LA402 front loaders, including the different control valve types across the model groups.
Is this the repair manual with torque specs?
Yes. This is the factory workshop manual. The servicing section holds the troubleshooting guide, servicing specifications, allowable limits, and the full tightening torque tables. p. 41
What is the relief valve setting pressure?
High flow models are set at 13.1 to 13.8 MPa and standard flow models at 14.5 to 15.2 MPa. The mechanism and servicing sections cover checking and adjusting the relief valve. p. 47
What torque do the main frame mounting bolts need?
The M14 main frame bolts torque to 147 N-m (108 ft-lbs) and the M12 bolts to 83 N-m (61 ft-lbs), as listed in the servicing torque tables. p. 48
Is this Kubota LA271–LA402 Series Workshop Manual a digital download?
Immediate download of the full 62-page searchable workshop manual. Open it on any device: laptop at your desk or phone in the field.
Am I able to print pages from this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this Kubota LA271–LA402 Series manual include hydraulic schematics?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Kubota LA271–LA402 Series.
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