Komatsu FG18HT-20 Specifications
The Komatsu FG18HT-20 is a compact 1.8-ton (1,800 kg /
3,960 lb) LPG/petrol pneumatic-tire forklift engineered for mixed indoor-outdoor
industrial environments requiring dependable engine performance, superior
maneuverability, low emissions, and long-term durability.
As part of Komatsu’s 20 Series HT (Heavy-Tire)
pneumatic lineup, the FG18HT-20 offers excellent traction, enhanced
stability, and improved ground clearance compared to cushion-tire
variants, making it suitable for warehouses, light Construction yards,
distribution facilities, pallet-handling depots, and general
material-handling operations.
The forklift is powered by the Nissan K21 industrial engine - a proven
2.1-liter, 4-cylinder spark-ignition engine widely used in modern
Komatsu, Nissan/TCM, UniCarriers, and CAT forklift platforms. Known for
exceptional reliability, quiet running, fuel efficiency, and smooth
throttle response, the K21 engine provides ample torque for lifting,
traveling, and continuous multi-shift duty.
The FG18HT-20 uses a torque-converter
powershift transmission, hydrostatic steering, a gear-type hydraulic
pump, a rugged welded chassis, and an operator-friendly platform with
wide visibility, stable handling, and simple service access.
Technical Data:
- Engine model: Nissan K21 Industrial
- Configuration: inline 4-cylinder, 4-stroke, spark-ignition
- Displacement: 2.065 L (2,065 cc)
- Bore/stroke: 89x100 mm (3.50x3.94 in)
- Rated power: 37-42 kW (50-56 hp) @ 2,400-2,600 rpm
- Peak torque: 160-185 Nm (118-136 lb-ft) @ 1,600-1,800 rpm
- Fuel: LPG or gasoline depending on market
- Fuel system: EFI or LPG mixer depending on production year
- Aspiration: naturally aspirated
- Idle speed: 650-750 rpm
- Notes: durable industrial platform designed for continuous multi-shift
operation.
Lubrication System
- Lubrication type: full-pressure wet-sump
- Oil capacity: 4.0-4.5 L (4.2-4.8 qt)
- Oil pressure (nominal): 250-400 kPa (36-58 psi)
- Recommended oil: SAE 10W-30 or 15W-40
- Oil pump: internal gear-type
- Filtration: full-flow spin-on cartridge
- Notes: long-life Lubrication System simplifies maintenance.
Cooling System
- Type: liquid-cooled, pressurized
- Coolant capacity: 7-9 L (7.4-9.5 qt)
- Thermostat opening: 82°C (180°F)
- Fully open: 95°C (203°F)
- Cooling fan: belt-driven mechanical
- Water pump: centrifugal
- Radiator: fin-tube industrial core
- System pressure: 88-108 kPa (13-16 psi)
Transmission
- Type: torque-converter powershift
- Gear selection: 1-2 forward / 1-2 reverse
- Direction control: mechanical or hydraulic shuttle lever
- Travel speed (unladen): 17-19 km/h (10.5-11.8 mph)
- Travel speed (laden): 15-17 km/h (9.3-10.5 mph)
- Fluid capacity: 6-8 L (6.3-8.4 qt)
- Fluid type: Dexron II/III ATF
- Cooling: Transmission oil-cooler integrated into radiator system
Front Drive Axle
- Construction: rigid cast-steel housing
- Differential: bevel-gear industrial type
- Oil capacity: 3.0-4.0 L (3.2-4.2 qt)
- Lubricant: SAE 80W-90 gear oil
Rear Steer Axle
- Type: oscillating center-pivot
- Oscillation capability: ±8-10 degrees
- Lubrication capacity: 0.7-1.2 L
- Notes: ensures stable travel over moderately uneven ground.
Braking System
- Service brakes: hydraulic drum brakes
- Parking brake: mechanical lever-operated drum
- Notes: simple, durable, low-service-frequency braking design.
- System voltage: 12 V
- Battery: 65-90 Ah
- Alternator output: 35-55 A
- Starter motor: 1.6-2.0 kW
- Harness: industrial-grade, abrasion-protected, sealed connectors
Dashboard indicators:
- oil pressure
- coolant temperature
- charge warning
- LPG/petrol fuel gauge
- hour meter
- parking brake indicator
Drive configuration
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2WD with pneumatic tires
Pneumatic Tires
- Front: 6.50-10 or 7.00-12
- Rear: 5.00-8
Optional: solid pneumatic, non-marking, or outdoor traction tires
Chassis Features
- Fully welded steel frame
- Integrated counterweight assembly
- Reinforced overhead guard
- Anti-slip operator steps
- Rubber-isolated engine mounts
- Protected hydraulic and electrical routing
- Industrial belly pans for component protection
Steering
- Type: fully hydrostatic steering
- Steering pump flow: 5-8 L/min (1.3-2.1 gpm)
- Steering cylinder: double-acting
- Minimum turning radius: 2.0-2.2 m (79-87 in)
- Rear axle: oscillating for stability on uneven terrain
- Steering characteristics: light-effort steering with high maneuverability.
- Pump type: engine-driven external gear pump
- Flow output: 35-50 L/min (9-13 gpm)
- Maximum pressure: 15-18 MPa (2,175-2,610 psi)
- Hydraulic reservoir capacity: 22-30 L (23-32 qt)
- Oil type: ISO VG 32 or ISO VG 46
Cylinders:
- dual lift cylinders
- dual tilt cylinders with cushioning
- Valve system: mechanical proportional spool controls
| Service Refill Capacities |
- Engine oil: 4.0-4.5 L
- Cooling System: 7-9 L
- Transmission: 6-8 L
- Drive axle: 3.0-4.0 L
- Steer axle: 0.7-1.2 L
- Hydraulic tank: 22-30 L
Mast types:
- Simplex (1-stage)
- Duplex (2-stage)
- Triplex (3-stage, full free-lift)
Lift height ranges:
- Simplex: 2.5-3.0 m (98-118 in)
- Duplex: 3.0-4.0 m (118-157 in)
- Triplex: 4.0-5.0 m (157-197 in)
Fork specifications:
- Standard lengths: 920 mm (36 in), 1,070 mm (42 in)
- Optional: 1,220-1,829 mm (48-72 in)
- Fork width: 100-125 mm
- Thickness: 35-40 mm
- Fork class: ITA Class II
- Rated capacity: 1,800 kg (3,960 lb)
- Load center: 500 mm (20 in)
Derating occurs with:
- long forks
- high mast elevation
- heavy attachments
- side-shift offset
- off-center loads
- operation on rough terrain
- Lift speed (unladen): 0.45-0.58 m/s
- Lift speed (laden): 0.25-0.38 m/s
- Lowering speed: 100-150 ft/min
- Gradeability (unladen): 18-25%
- Gradeability (laden): 10-18%
- Drawbar pull: 8,000-11,000 N (1,800-2,475 lbf)
- Length to fork face: 2280 mm (90 in)
- Width: 1070 mm (42 in)
- Overhead guard height: 2030 mm (80 in)
- Ground clearance: 120-130 mm (4.7-5.1 in)
- Turning radius: 1990 mm (78 in)
- Aisle width (1000x1200 pallet): 3395 mm (134 in)
- Maximum fork height: 1955-3955 mm (77-158 in)
- Free lift: 140 mm (5.5 in)
- Supported forks: 36-72 in
- Operating weight: 2,650-2,900 kg (5,835-6,385 lb)
- Counterweight: 1,000-1,250 kg (2,200-2,750 lb)
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