Part of the Kubota Repair Manuals.
This Kubota Workshop Manual covers the LA1954AU and LA2254AU front loaders, the self-leveling AU versions, across 155 pages of factory service data. It also documents the standard LA1954 and LA2254 hydraulic circuits, so it suits owners, dealers, and independent technicians rebuilding or diagnosing these loaders.
The manual is organized into Information, General, Mechanism, and Servicing sections. It details loader and bucket specifications, lubricants and tightening torque values, the full hydraulic circuit, standard and self-leveling control valve assembly structure and operation, the spill guard system, and the boom and bucket cylinders.
Use it to troubleshoot slow or drifting hydraulics, set relief valve pressure, torque mounting hardware and fittings correctly, dismount the loader from the tractor, and rebuild the control valve and cylinders to the correct servicing specifications with the listed accumulator and relief pressures.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | 4-15 | Safety First, Safety Decals, Loader Terminology, Specifications (Loader Specifications, Bucket Specifications, Dimensional and Operational Specifications) |
| General | 16-27 | Loader Identification, Lubricants, Tightening Torque (Stud Bolts, American Standard Screws, Bolts and Nuts with Unc or Unf Threads, Plugs, Hydraulic Fittings) |
| Hydraulic Circuit | 31-34 | LA1954 (Standard Type Control Valve), LA1954AU (Self-Leveling Type Control Valve), LA2254 (Standard Type Control Valve), LA2254AU (Self-Leveling Type Control Valve) |
| Control Valve Assembly (Standard Type) | 35-41 | Operation |
| Control Valve Assembly (Self-Leveling Type) | 42-87 | Operation |
| Spill Guard System | 88-98 | Spill Guard Link, Spill Guard Valve, Spill Guard Valve Operation |
| Boom Cylinder and Bucket Cylinder | 99 | |
| Port Relief Valve (LA2254AU) | 100-101 | Hydraulic Circuit, Port Relief Valve Operation |
| 3rd Function Valve (Option) | 102-106 | Operation, Electrical Circuit |
| Hydraulic Accumulator (Option) | 107-109 | Accumulator Valve, Accumulator Relief Valve, Hydraulic Accumulator |
| Servicing | 110-155 | Dismounting Front Loader From Tractor, Stand and Side Frame, Hydraulic Hose |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| General Use Screws, Bolts and Nuts (M6, Ordinariness) | 7.9 to 9.3 N·m | p. 21 |
| General Use Screws, Bolts and Nuts (M8, Ordinariness) | 18 to 20 N·m | p. 21 |
| Relief Valve Setting Pressure | 19.1 to 19.6 MPa | p. 113 |
| Piston Rod Bend Allowable Limit | 0.25 mm | p. 113 |
| Solenoid Valve Coil Resistance | Approx. 4.8 Ω | p. 113 |
| Lock nut (M6) Tightening Torque | 9 to 11 N·m | p. 114 |
| Port Relief Valve Tightening Torque | 19.6 to 23.6 N·m | p. 114 |
| Hydraulic tube and hose Tightening Torque | 44 to 50 N·m | p. 114 |
| Main frame mounting screw (M20) Tightening Torque | 368 N·m | p. 115 |
| Boom cylinder bottom side accumulator gas pressure | 3.9 to 4.1 MPa | p. 110 |
| LA1954AU | ||
| Boom and bucket cylinder head Tightening Torque, LA1954AU | 250 to 280 N·m | p. 114 |
| LA2254AU | ||
| Boom and bucket cylinder head Tightening Torque, LA2254AU | 500 to 550 N·m | p. 114 |
