Part of the Kubota Repair Manuals.
This Kubota workshop manual covers the LA1153AU and LA1353AU front loaders. Across 129 pages it provides the mechanism, servicing specifications, and repair procedures needed to service and rebuild these loaders.The manual begins with loader specifications, safety, and terminology, then lays out the tightening torque tables for screws, stud bolts, plugs, and hydraulic fittings. A detailed mechanism section covers the hydraulic circuit, the self-leveling control valve assembly, the spill guard valve, and the optional third function and boom check valves.The servicing section carries the troubleshooting charts, servicing specifications, tightening torques, and step by step guidance for dismounting the loader from the tractor, checking, and rebuilding the cylinders and valves. This is a repair-level PDF for owners and mechanics working on a Kubota LA1153AU or LA1353AU, not an operator's quick guide.
What's Inside This Kubota LA1153AU, LA1353AU Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | 4-13 | Safety First, Safety Decal, Loader Terminology, Loader Specifications, Bucket Specifications, Dimensional and Operational Specifications |
| General | 14-24 | Loader Identification, General Precautions, Lubricants, Stud Bolts, Plugs, Hydraulic Fittings, Maintenance Check List, Check and Maintenance |
| Hydraulic Circuit | 28-30 | - |
| Control Valve Assembly (Self-Leveling Valve) | 31-66 | - |
| Relief Valve | 67-69 | - |
| Spill Guard Valve | 70-76 | - |
| 3rd Function Valve (Option) | 77-82 | Boom Cylinder and Bucket Cylinder |
| 3rd Function Valve Assembly (Option, Equipped with Shutoff Valve) | 83-87 | 3rd Function Valve Assembly (Option, Equipped with Shutoff Valve) |
| Boom Check Valve Assembly | 88 | - |
| Hydraulic Accumulator (Option) | 89-92 | - |
| Servicing | 93-129 | Dismounting Front Loader From Tractor, Chcking, Disassembling and Servicing |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Control valve stay mounting bolt | 48 to 55 N·m | p. 19 |
| Hose fitting, Flare nut (UNF) - Thread size 3/4 | 36.0 to 40.0 N·m | p. 21 |
| Main Frame Mounting Bolt Torque (M20) | 368 N·m | p. 24 |
| LA1353AU | ||
| Boom and bucket cylinder head | 575 to 605 N·m | p. 19 |
| Piston seal (LA1353AU) - Diameter C | 71.18 mm dia. | p. 119 |
| LA1353AU Rated Flow | 64.3 L/min. | p. 11 |
| LA1353AU Maximum Pressure | 20.7 MPa | p. 11 |
| LA1153AU | ||
| Piston seal (LA1153AU) - Diameter C | 60.31 mm dia. | p. 119 |
| LA1153AU Rated Flow | 42 L/min. | p. 11 |
| LA1153AU Maximum Pressure | 19.8 MPa | p. 11 |
| M5740, M7040 | ||
| Transmission Case Capacity (M5740, M7040) | 56.0 L | p. 18 |
| M8540, M9540 | ||
| Transmission Case Capacity (M8540, M9540) | 60.0 L | p. 18 |
Kubota LA1153AU, LA1353AU Common Problems This Manual Covers
Loader arms drift down under load
Arms that settle or will not hold position usually indicate internal leakage past the lift cylinder seals or a worn control valve spool. The Servicing section troubleshooting charts guide the diagnosis.
Manual Section: Servicing p. 93Loader lifts slowly, weakly, or stalls
Low fluid, a clogged filter, air in the system, or a valve restriction can rob the loader of lift. The Mechanism section details the hydraulic circuit and control valve so you can trace the flow.
Manual Section: Mechanism p. 25Bucket or curl function is jerky or delayed
A sticky or worn valve section, contaminated oil, or a binding linkage makes the curl function unresponsive. The Mechanism section covers the self-leveling control valve assembly, structure, and operation.
Manual Section: Mechanism p. 25Hydraulic leaks at couplers, hoses, or seals
Aged seals, cracked hoses, and loose fittings are frequent maintenance items on these loaders. The General section provides the hydraulic fitting and flare nut torque values for correct reassembly.
Manual Section: General p. 14Hydraulic oil overheating in use
Excessive internal leakage, a relief valve fault, or low or incorrect fluid can drive oil temperature up. The Servicing section lists the servicing specifications, including relief valve setting pressure, to check against.
Manual Section: Servicing p. 93Loader frame or mounts loosen or crack
Loose hardware, fatigue, or overload can let mounting points shift or crack. The General section gives the main frame mounting bolt torque and the tightening torque tables for the loader hardware.
Manual Section: General p. 14Frequently Asked Questions
Which loader models does this manual cover?
It covers the Kubota LA1153AU and LA1353AU front loaders.
Is this a workshop manual or an operator guide?
This is a workshop manual. It covers the loader mechanism, hydraulic circuit, servicing specifications, troubleshooting, and rebuild procedures, not just day to day operation.
Does it cover the hydraulic control valve?
Yes. The Mechanism section details the hydraulic circuit and the self-leveling control valve assembly, including its structure and operation, along with the spill guard valve. p. 25
Does it list the loader torque specifications?
Yes. The General section lays out the tightening torque tables for screws, stud bolts, plugs, and hydraulic fittings used on the loader. p. 14
What do I get after purchasing this Kubota LA1153AU manual?
Right after checkout you download a 129-page searchable PDF. Open it on a laptop, tablet, or phone and bring it straight to the shop floor.
Is this Kubota LA1153AU manual print-friendly?
Yes. Print as many copies as you like; there are no restrictions. Plenty of mechanics just print the one section they need and take it to the machine.
Does this Kubota LA1153AU manual include hydraulic schematics?
Yes. The manual includes hydraulic circuit diagrams, system schematics, and component specifications with pressure ratings.
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