Kubota L4310DT, L4310GST, and L4310HST Tractor Parts Manual (P/N 100K0491)

This Kubota parts catalog, book number 100K0491, covers the L4310DT, L4310GST, and L4310HST tractors and the ROPS configurations identified in its parts groups. It supports replacement-part identification; workshop repair and adjustment procedures are outside its scope.

• Engine parts: Exploded views and OEM listings for the crankcase, oil pan, cylinder head, piston and crankshaft assemblies, gasket kits, and oil-filter components.

• Fuel and cooling: Illustrated breakdowns of the injection pump, nozzle holder, fuel filter, water pump, thermostat, and radiator.

• Transmission and axles: Manual T/M, GST, and HST parts groups, including clutch and PTO assemblies, range gear shafts, and front and rear differentials.

• Hydraulics and steering: Hydraulic-pump internals, control valves, hydraulic cylinder, lift arm, steering controller, and steering-cylinder component drawings.

• Electrical components: Alternator, starter, panel board, switches, lighting, and harness-location drawings with separate HST and non-HST listings.

• Chassis and options: Brake linkage, hood/bonnet, fenders, ROPS, front-guard stays, remote-control-valve equipment, and swinging/clevis drawbar parts.

This catalog is suited to mechanics, parts-counter staff, and owners who can match exploded-view callouts to part numbers and apply serial-number and country-code notes.

Serial Numbers and Parts Interchangeability

The serial-number ranges and interchangeability codes help distinguish revised components before replacement parts are ordered. The introductory instructions explain two-way interchangeability, one-way replacement, and non-interchangeable parts.

Parts tables connect drawing references with OEM numbers, quantities, applicability notes, and weight columns. Separate [A] and [CA] label groups distinguish U.S. and Canadian labeling; the country-code instructions explain how regional exceptions affect parts selection.

Engine and Fuel-System Parts

The engine drawings identify individual components within the crankcase, cylinder head, and oil pan. Upper and lower gasket-kit listings show their constituent seals and gaskets, while the gear-case section identifies the oil-filter cartridge and its mounting components.

The injection-pump breakdown reaches the plungers, delivery valves, springs, and control rack. Nozzle-holder pages separately identify the nozzle, heat seals, and adjusting washers.

Injection-pump assemblies and mounting shims include revisions marked non-interchangeable. Matching a shim's thickness alone does not establish compatibility with the listed serial application.

GST, HST, and PTO Assemblies

GST valve drawings separate the rotary-valve, piston, and internal-valve components. The HST breakdown identifies pump and motor rotating assemblies, the swash plate, port-block cover, and regulator, including serial-specific assembly changes.

Clutch-housing and mid-case drawings follow the transmission type. The transmission-case, PTO-shaft, and front-wheel-drive-shaft groups are expressly labeled without mid-PTO; they do not provide complete parts coverage for a mid-PTO installation.

Hydraulics, Steering, and Optional Equipment

Separate hydraulic-pump listings distinguish HST from non-HST components. Inlet, delivery, and power-steering oil-line drawings identify the pipes, hoses, seals, and fittings, while old- and new-type control-valve pages show different internal arrangements.

The steering cylinder has its own rod, piston-seal, and end-cover breakdown. Optional draft-control linkage, remote-control-valve levers and couplers, front-guard stays, and swinging/clevis drawbar assemblies have separate parts groups.

Electrical Parts and Harness Locations

Alternator and starter sections include component-level views; panel-board pages identify individual instruments and lamps. The Electrical Wiring drawings locate harnesses, fuse boxes, clamps, and related parts. These are parts-location drawings, not circuit schematics or electrical troubleshooting procedures.

For safe hands-on work on hydraulics, PTO components, and the drivetrain, rely on the appropriate OEM service literature and qualified mechanics.

Examples of Engine Part Sizes

These examples are a small selection of the catalog's part-sizing information. The piston and crankshaft listing distinguishes standard pistons and ring sets from +0.5 mm oversize versions, with crankpin bearing sets listed in standard, -0.2 mm, and -0.4 mm sizes.

Nozzle-holder adjusting washers are listed in thicknesses from 0.900 mm to 1.950 mm, each tied to a part number. These dimensions identify replacement-part versions; they are not wear limits or adjustment instructions.

Searchable Parts Listings and Bookmarked PDF

Text search and drawing detail: Parts-list text and section headings are searchable, with embedded PDF bookmarks for individual parts groups. Small reference numbers in dense assembly drawings are easier to read when enlarged. The opening supplementary page has no searchable text.

One printable, English-language 557-page PDF contains 556 pages of parts-book instructions, index, and catalog content, plus one supplementary opening page already included in the total.