Knowledge Corner: How a CT9 Turbocharger Works

A turbocharger uses exhaust gas energy to drive a turbine wheel, which shares a shaft with a compressor wheel. The compressor draws in ambient air, compresses it and forces it into the engine intake manifold. The increased air density allows more fuel to be burnt, raising engine power without increasing displacement. The CT9 unit on 1.3 L 4EFTE engines boosts output from 75 HP to 90-105 HP, giving Starlet GT drivers the legendary sporty feeling while maintaining factory fuel economy when driven gently.

Random Heavy-Duty Glossary (learn a part a day)

• CATERPILLAR 345D fan motor – mounted at rear of radiator, drives cooling fan, replaces OEM 177-7371

• KOMATSU PC200-8 hydraulic pump solenoid – fitted on main pump regulator, controls swash-plate angle

• JOHN DEERE 6125M fuel injector – installed in cylinder head, part RE531209

• VOLVO FH16 gearbox shift cylinder – located on top of I-Shift transmission, OEM 20595090

• HITACHI ZX350-5A swing reduction gear – planetary gearbox under cab, part 9258930

• MAN TGX D26 turbocharger actuator – bolted to GT37 turbo, replaces 51.09100-6149

• NEW HOLLAND T7.270 hydraulic filter – spin-on element on return line, OEM 84290888

• BENZ ACTROS OM471 intercooler hose – connects cooler to intake manifold, part A4710901480

• DOOSAN DX300LC track roller – undercarriage bottom roller, part 270500-00046

• IVECO DAILY 70C17 EGR valve – mounted on intake throttle, replaces 504048873

Fault & Fix Case

Issue: A contractor's CATERPILLAR 320D exhibited black smoke and lack of power at 2 800 rpm.
Root cause: Turbocharger variable geometry nozzle ring stuck with carbon; actuator rod travel dropped to 2 mm (spec 8 mm).
Solution: Removed turbo, cleaned nozzle ring and pivot pins with ultrasonic bath, re-calibrated actuator with Caterpillar ET tool, replaced engine oil and filter. Smoke cleared and power restored to 143 hp.

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More Turbo References – One Click Away

• 🔍 Click to check GARRETT turbocharger part numbers

• 🔍 Click to check CUMMINS turbocharger part numbers

• 📦 Browse KALMAR product list

• ⚙️ Explore hydraulic parts

• ⚙️ View hydraulic pump range

• 🔧 CATERPILLAR parts catalog

• 🏷️ Compare turbo brands: Garrett, Holset, BorgWarner, 3K, Schwitzer, IHI, Mitsubishi, Hitachi, CZ, TOYOTA, Komatsu, Bosch Mahle

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