This Kubota LA844 Front Loader manual (OEM #9Y111-01680) stays on one machine across its 51 pages, from control valve teardown to full cylinder servicing. Hydraulic schematics trace the circuit through boom, bucket, and power-beyond valve sections, with 7 pages devoted to mechanism coverage. The servicing chapters bring a troubleshooting chart, maintenance checklists for the 10- and 50-hour intervals, torque tables for hydraulic fittings, plugs, and UNC/UNF fasteners, plus exploded views for assembly reference. Piston seal (A) installation clearance is set to 80 μm (0.0031 in.), and the boom cylinder head torques to 580 to 600 N·m on reassembly. With your loader down, guesswork only costs more time. Download it, search by keyword, and bookmark the spec or procedure you need.
What's Inside This Kubota LA844 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-22 | Loader Identification, Lubricants, Tightening Torques (Stud Bolts, American Standard Screws, Bolts And Nuts With Unc Or Unf Threads, Plugs, Hydraulic Fittings) |
| Mechanism | 23-33 | Control Valve Assembly (Hydraulic Circuit, Hydraulic Block, Structure, Operation, Inlet and Outlet Section, Boom Control Section, Bucket Control Section, Power Beyond, Neutral, Down, Floating, Roll-back, Dump) |
| Servicing | 34-51 | Control Valve, Hydraulic Hose, Control Lever, Bucket, Boom, Hydraulic Cylinder, Piston Rod, Piston Seal |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bucket cylinder head mounting torque | 460 to 480 N·m | p. 37 |
| Boom and bucket cylinder piston mounting nut | 300 to 320 N·m | p. 37 |
| Boom cylinder head mounting torque | 580 to 600 N·m | p. 37 |
| Piston Seal (A) installation clearance (Boom) | 80 μm (0.0031 in.) | p. 45 |
| Control valve mounting bolt torque | 24 to 27 N·m | p. 41 |
| Elbow tightening torque | 48 to 54 N·m | p. 42 |
| Adjustable elbow, Adapter (O-ring port) (UNF) 9/16 thread size torque | 37 to 44 N·m | p. 19 |
| Adjustable elbow, Adapter (O-ring port) (UNF) 3/4 thread size torque | 48 to 54 N·m | p. 19 |
| Transmission case capacity | 44.0 L | p. 16 |
| Hydraulic fluid type | KUBOTA UDT or SUPER UDT fluid | p. 16 |
| Relief valve setting pressure | 17.7 to 18.1 MPa | p. 36 |
| Relief valve setting condition - Engine Speed | Approx. 2700 min¯¹ (rpm) | p. 36 |
Kubota LA844 Common Problems This Manual Covers
Kubota LA844 bucket slowly drifts down on its own after lifting, no external leak visible p. 43
Remove the bucket cylinder and inspect piston seals per the procedures starting on page 43. Piston Seal (A) installation clearance must measure within 80 μm (0.0031 in.); seals outside this tolerance allow internal bypass. Replace the full seal kit if any seal shows scoring or deformation, then torque the piston mounting nut to 300 to 320 N·m.
Manual Section: Bucket, Boom and Hydraulic Cylinder Disassembly and AssemblyBoom won't raise under load or stalls mid-lift with engine at full throttle p. 36
Check transmission fluid level first; the case holds 44.0 L of Kubota UDT or SUPER UDT fluid (page 16). Then connect a pressure gauge and verify relief valve setting on page 36 with engine at approximately 2700 rpm and oil at 44 to 48°C. Spec is 17.7 to 18.1 MPa. Below spec points to pump wear or a bypassing valve.
Manual Section: General Loader MalfunctionsOne loader circuit stops responding completely while the other function still operates p. 41
Inspect the control valve spool for the dead circuit. Disassemble per page 41 and check for scoring, contamination, or a seized spool bore. Clean or replace the affected spool. On reassembly, torque the cover mounting bolts to 9.81 to 11.2 N·m and set control lever rod 1 length to 115.3 to 116.3 mm.
Manual Section: Control Valve Assembly Disassembly and AssemblyHydraulic pump making grinding or whining noise, cylinder response sluggish, oil temperature elevated p. 16
Drain and refill the transmission case with Kubota UDT or SUPER UDT fluid to the full 44.0 L mark (page 16). Contaminated or low fluid is the most common source of noise and heat. After refill, verify relief valve pressure at 2700 rpm; spec is 17.7 to 18.1 MPa on page 36. Above 18.1 MPa indicates a stuck relief valve.
Manual Section: Transmission Fluid Level CheckHydraulic hose fittings and couplers weeping oil at connections after pressure is applied p. 19
Pinpoint each weeping connection, then torque fittings to spec. UNF 9/16 flare nuts require 22 to 25 N·m; 3/4 flare nuts require 36 to 40 N·m; 7/8 flare nuts require 43 to 50 N·m (page 19). Replace any hose showing cracking, abrasion, or soft spots. O-ring port adapters use different torque values than flare nuts.
Manual Section: Hydraulic Hoses InspectionFrequently Asked Questions
What are the torque specs for Kubota LA844 loader pins and bolts?
Boom cylinder head mounting torque is 580 to 600 N·m (428 to 442 lbf·ft). The bucket cylinder head takes 460 to 480 N·m (340 to 354 lbf·ft), and the boom and bucket cylinder piston mounting nut takes 300 to 320 N·m (222 to 236 lbf·ft). Both the main frame and sub frame mounting bolts and nuts tighten to 226 N·m (166 lbf·ft).
Why is my Kubota LA844 loader not lifting?
When the boom won't rise, start with the control valve, boom cylinder, and control lever linkage. The fault can also trace to a malfunctioning hydraulic pump, a clogged oil filter, a damaged relief valve spring, a damaged hydraulic hose, or a relief valve that is dirty or stuck.
How to test Kubota LA844 control valve
Testing the control valve means reading the relief valve setting pressure, spec'd at 17.7 to 18.1 MPa (181 to 185 kgf/cm², 2560 to 2630 psi). Run the engine at roughly 2700 min⁻¹ (rpm) with oil temperature held between 44 to 48 °C (110 to 120 °F).
What are the replacement specifications for Bucket tilt/curl cylinder seals?
Replacing the bucket cylinder piston seals and O-rings calls for a slide jig and correcting jig at set dimensions. The bucket piston seal runs an A dimension of 80 μm (0.0031 in.), C diameter 55.18 mm (2.17 in.), D diameter 56.18 mm (2.21 in.), and E dimension 42.0 mm (1.65 in.). K diameter is 55.2 mm (2.17 in.), L diameter 63.9 mm (2.52 in.).
What do I get after purchasing this Kubota LA844 manual?
A 51-page searchable PDF, ready to download right away. It opens on any device, so you can pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this Kubota LA844 Workshop Manual printable?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Can I find hydraulic circuit diagrams in this Kubota LA844 manual?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Kubota LA844.
Document Quality
This document is a scanned PDF, but it includes a high-quality OCR layer, so you can search and copy the full text content. All text is crisp and easy to read, appearing clearly on every page. Diagrams and illustrations are present as clear raster images, and their labels are consistently readable. The pages are clean, free from scan artifacts, stains, or skewed content. There are no notable blank or filler pages within the document.
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