Caterpillar TH355B

The Caterpillar TH355B is a mid-size rough-terrain telehandler from Caterpillar's B-series lineup, built in roughly the 2003 to 2007 window. It runs a Cat 3054E turbocharged diesel, a 4.4-liter inline-4 rated at approximately 74.5 kW (100 hp), paired with a 4-speed power-shuttle transmission and 4x4x4 steering. Operating weight lands in the neighborhood of 11,400 kg (25,100 lb), though factory-certain figures for this exact model are thin; treat that number as approximate. The TH355B was offered with an enclosed ROPS/FOPS cab, quick coupler, and reach in the 8-meter class depending on configuration. It sits mid-pack in a shared chassis family that spans TH340B, TH350B, TH360B, TH460B, and TH560B, all built on common B-series architecture and documented in a single combined service manual.

Within the B-series generation, Caterpillar standardized the 3054E electronic-injection engine, a common cab, and shared hydraulic and driveline architecture across the TH340B-TH560B family, replacing earlier mechanical-injection telehandlers. Documented running changes specific to the TH355B itself are sparse; its fluid architecture and 4x4x4 drivetrain track closely with its siblings rather than diverging. No factory record confirms a direct one-for-one successor model. In the used and parts market, the TH355B matters because original units are increasingly scarce, but parts commonality across the shared B-series manual (filters, chain, hydraulic and driveline components) keeps it serviceable years after production ended. Buyers and shops should verify serial-specific engine and driveline details against the machine's own data plate before ordering parts, given how closely the B-series siblings share model numbering and documentation.

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.