Komatsu WB91R-1 / WB93R-1(S/N 0000007-Up)

The Komatsu WB91R-1 / WB93R-1 (S/N 0000007-Up) is a wheeled loader-backhoe: a rigid-frame machine carrying a front loader bucket and a rear digging arm on one chassis, built by FAI (Fabbrica Attrezzature Industriali) in Noventa Vicentina, Italy, before Komatsu took a shareholding stake in 1989 and full ownership in 1995 as FKI Fai Komatsu Industries. This plain-numeric serial block, 0000007-Up with no alpha prefix, is the earliest documented generation of the WB91R/WB93R family, predating the WB91R-2/WB93R-2 generation that follows with 91F-/93F-prefixed serials and a different, Komatsu-sourced engine family. Under this single S/N block, the WB91R designation covers a naturally aspirated diesel engine option and the WB93R designation covers a turbocharged version of the same base engine family, sharing one parts book. The front axle was offered in 2WD and 4WD configurations, and the front power take-off could be fitted with either a commercial pump or a Hamworthy pump, letting the original buyer tailor drivetrain and hydraulic-drive equipment to the job. Exact operating weight and production years for this specific serial range are not published in surviving factory literature; the machine dates to the Italian-built, pre-electronic-controls era of the line, ahead of the later Avance and -5/-8 generation redesigns.

Later generations moved the line onto Komatsu's own engine and control architecture: the WB91R-2/WB93R-2 (Avance) generation adopted a different Komatsu engine family and alpha-numeric serials, and the subsequent WB93R-5/-5E0/-8 updates added electronic engine management, load-sensing hydraulics, and servo-joystick backhoe controls, none of which apply to this earlier mechanical-governance block. On the WB91R-1/WB93R-1 (S/N 0000007-Up), the operator interface is a mechanical gauge cluster with individual warning lamps rather than a digital display, and there is no electronic diagnostic system, so troubleshooting relies on gauges, test lamps, and the factory shop manual's mechanical test-and-adjust procedures rather than a code reader. In the used-equipment and parts market, this generation is a low-population, early-production block with almost no surviving dedicated spec sheets, OMM copies, or online documentation, unlike its well-documented successors. That scarcity makes correct identification of the exact serial range important: parts, service data, and specifications should be sourced against this specific S/N block rather than borrowed from the better-documented -2 or -5/-8 generations, and buyers or owners should expect to lean on a dealer or the machine's own data plates for confirmation rather than published references.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.