Need factory-level service data for your Kubota LA1153AU or LA1353AU front loader? This 129-page workshop manual (OEM #9Y111-04012) lays out every hydraulic circuit, control valve procedure, and servicing spec. The hydraulic system section traces each circuit variant from old-type 3rd function valves to boom check valve configurations, with electrical circuits for the 3rd function solenoid, wiring diagrams, and a full troubleshooting section. Exploded-view diagrams, torque tables for hydraulic fittings and cylinder heads, and a 10-hour/50-hour maintenance checklist round out the coverage. The boom and bucket cylinder head torques to 250 to 280 N·m on the LA1353AU; the 3/4-inch UNF flare nut seats at 36.0 to 40.0 N·m. Every idle hour costs money. Download the bookmarked PDF and walk to the machine with the right numbers.
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
Kubota LA1153AU front end loader arms drift down and drop by their own weight p. 96
Check the boom cylinder tubes and piston seals for wear. Connect a pressure gauge and test the relief valve setting pressure on page 96. Adjust the LA1153AU valve to reach 19.4 to 20.1 MPa. Inspect the control valve stay mounting bolts and torque to 48 to 55 N·m.
Manual Section: Front End Loader Drops by its WeightBucket and boom lift slowly or completely stall out before reaching full height p. 18
Verify the transmission case fluid level is correct before tearing into the hydraulics. Fill M5740 or M7040 tractors to the 56.0 L capacity specified on page 18. Inspect the hydraulic filter for clogs and verify the pump supplies adequate flow to the loader control valve.
Manual Section: Boom Does Not RiseMain loader frame mounting points loosen and shift during heavy material handling p. 24
Inspect all frame mounting hardware for fatigue or impact damage. Torque the M20 main frame mounting bolts to 368 N·m as detailed on page 24. Lubricate all pivot pins and tighten the grease fittings to 4.1 to 6.7 N·m using the specifications on page 21.
Manual Section: GeneralBucket curl function feels extremely jerky, delayed, or completely unresponsive under load p. 109
Test the bucket cylinder for internal bypass and inspect the control valve for a sticky spool. Consult the exploded parts view on page 109 to disassemble the valve block. Clean the components and torque the control valve stay mounting bolts to 48 to 55 N·m upon reassembly.
Manual Section: Bucket Does Not MoveFrequently Asked Questions
What are the torque specs for the Kubota LA1153AU / LA1353AU valve or cylinder bolts?
The tightening torque for the control valve stay mounting bolt is 48 to 55 N·m (36 to 41 lbf·ft). For the LA1153AU, the boom and bucket cylinder head bolts require 575 to 605 N·m (424 to 446 lbf·ft), and the piston mounting nut requires 330 to 350 N·m (244 to 258 lbf·ft). For the LA1353AU, the cylinder head bolts are 250 to 280 N·m (185 to 206 lbf·ft) and the piston mounting nut is 160 to 200 N·m (119 to 147 lbf·ft).
Why is my Kubota LA1353 loader quick coupler or joystick not working?
Two likely culprits for a 3rd function valve that won't operate on your Kubota LA1353 loader: a damaged electric line for the 3rd function, or a dirty relief valve. When the shutoff valve misbehaves, suspect either a faulty shutoff valve itself or a damaged electric line for the boom check valve.
What do I get after purchasing this Kubota LA1153AU, LA1353AU 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, LA1353AU Workshop Manual printable?
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.
Can I find hydraulic circuit diagrams in this Kubota LA1153AU, LA1353AU manual?
Yes. The manual includes hydraulic circuit diagrams, system schematics, and component specifications with pressure ratings.
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