Kubota KX91-3 Excavator Parts Catalog (P/N 100A0180)

This Kubota KX91-3 mini excavator parts catalog pairs exploded assembly drawings with OEM part numbers and serial-dependent listings for planning parts orders and repair work. It is a parts-identification reference, not a workshop manual with step-by-step repair or diagnostic procedures.

Searchable Parts Listings and Assembly Bookmarks

Search and drawing detail: PDF text search is available for assembly headings, part numbers and descriptions. Embedded bookmarks lead to the assembly sections. Small reference numbers in crowded drawings are easier to follow when zoomed in.

Supplied as one printable, English-language, 310-page PDF, including one parts-book instruction page and four product-index pages.

Engine, Hydraulics and Excavator Assembly Breakdowns

The selected topics below represent part of the catalog’s coverage. Additional listings include machine labels and accessories such as the oil-filter wrench.

• Engine components: Exploded views and parts lists for the crankcase, cylinder head, camshaft, piston and crankshaft, valve train, governor and flywheel.

• Fuel and cooling: Injection-pump internals, nozzle holders, glow plugs, fuel-filter components, radiator, thermostat and water-pump assemblies.

• Hydraulic assemblies: Piston-pump internals, drive motors, swivel motor, rotary joint and oil-tank components, with separate hydraulic piping illustrations.

• Valves and controls: Individual control-valve spool sections, boom-lock valve, change valve, TPSS valve, pilot valves and operating-lever linkages.

• Front attachments: Boom, standard and telescopic arms, bucket links, blade and cylinder components, including seals, bushes, pistons and rods.

• Undercarriage and frames: Track frame, idler, track rollers, rubber and iron crawler components, swivel frame, arch frame and swivel bearing.

• Electrical and operator platform: Starter and alternator breakdowns, harness-location drawings, switches, meters, canopy and cabin components, heater, defroster and wiper assemblies.

This catalog is suited to owners and technicians who can identify the installed assembly and use reference-number drawings to select replacement parts.

Part Numbers, Serial Changes and Interchangeability

Each illustrated assembly is paired with a table listing reference numbers, part numbers, descriptions and quantities. Serial-number and interchangeability columns distinguish replacement options, while remarks identify configuration differences.

Having the component breakdown at your workbench allows you to identify individual seals, pistons and housing parts before placing an order. The opening instructions explain the interchangeability symbols, including the difference between a two-way replacement and a newer part that replaces an older one.

Crankcase entries, for example, use alphanumeric serial references. These component references should not be treated as a single excavator-wide serial range.

Hydraulic Internals and Cylinder Differences

“Swivel Motor and Component Parts” and “Rotary Joint” provide separate breakdowns. Backup ring P/N 34076-66250 appears in the swivel-motor listing; the rotary joint has its own gasket, O-ring, shaft and collar entries.

The arm-cylinder tables mark several early and late internal components as noninterchangeable. A replacement complete cylinder and its individual piston, cylinder head or backup ring therefore require separate compatibility checks.

Standard and telescopic attachment sections also have distinct bucket-cylinder and bucket-link drawings. These views support parts identification; they do not provide pressure-test specifications or cylinder-overhaul instructions.

Always relieve hydraulic system pressure and mechanically support the arm before servicing any lines.

Harness Locations and Operator-Platform Parts

“Electrical Wiring” and “Cabin (Electrical Wiring)” show harnesses, clamps, switches, lights and their illustrated locations. They are parts-location drawings rather than circuit schematics for electrical fault tracing.

Cabin sections extend to door locks, window mechanisms, seal rubber, heating and defrosting components. Separate canopy and cabin entries help distinguish the installed operator-platform configuration.

Selected Piston and Bearing Size Options

The “Piston and Crankshaft” parts list includes standard and +0.25 mm piston and piston-ring options.

Crankpin bearing sets are listed in standard, -0.20 mm and -0.40 mm sizes. These are catalog size designations for selecting parts, not wear limits or machining instructions.