Komatsu FG18HTU-20 Specifications
The Komatsu FG18HTU-20 is a 1.8-ton (1,800 kg / 3,960
lb) LPG-powered pneumatic-tire forklift designed for demanding mixed
indoor/outdoor industrial environments. As part of Komatsu’s 20 Series HTU
(Heavy Tire USA-Market) lineup, the FG18HTU-20 combines robust pneumatic tires,
high ground clearance, increased chassis rigidity, and enhanced mast strength
with a compact footprint ideal for warehouse aisles as well as outdoor yard
conditions.
The model is powered by the GCT GK21 industrial engine - a 2.1-liter
spark-ignition engine manufactured by Group Component Technology (GCT) and
widely used in Komatsu, CAT, Mitsubishi, UniCarriers, and Nissan forklifts.
Known for smooth operation, excellent mid-range
torque, EFI precision, low emissions, and long component life, the GK21
engine provides exceptional reliability for multi-shift operations.
Combined with a torque-converter powershift transmission, hydrostatic
steering, and Komatsu’s refined hydraulic system, the FG18HTU-20 remains
a top choice for industrial fleets.
Technical Data
- Engine model: GCT GK21 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 output: 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 type: LPG (primary) or gasoline depending on market
- Fuel system: Electronic Fuel Injection (EFI)
- Aspiration: naturally aspirated
- Idle speed: 650-750 rpm
- Combustion: clean, efficient burn for reduced emissions and smooth response.
Lubrication System
- Lubrication type: full-pressure wet-sump
- Oil capacity: 4.0-4.5 L (4.2-4.8 qt)
- Operating oil pressure: 250-400 kPa (36-58 psi)
- Oil pump: internal gear-type
- Recommended oil: SAE 10W-30 or 15W-40
- Filtration: spin-on full-flow filter
- Notes: long-service-interval lubrication design supports multi-shift use.
Cooling System
- Cooling 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)
- Water pump: belt-driven centrifugal
- Cooling fan: mechanical
- Radiator: fin-tube industrial radiator
- System pressure: 88-108 kPa (13-16 psi)
Transmission
- Type: torque-converter powershift
- Gears: 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)
- Transmission fluid capacity: 6-8 L (6.3-8.4 qt)
- Recommended fluid: Dexron II/III ATF
- Cooling: integrated Transmission oil-cooler
Front Drive Axle
- Construction: rigid cast-steel axle
- Differential: bevel-gear industrial type
- Lubrication capacity: 3.0-4.0 L (3.2-4.2 qt)
- Lubricant: SAE 80W-90
Rear Steer Axle
- Type: oscillating center-pivot
- Oscillation capability: ±8-10 degrees
- Lubrication capacity: 0.7-1.2 L
- Notes: maintains traction and operator comfort on uneven surfaces.
Braking System
- Service brakes: hydraulic drum brakes
- Parking brake: mechanical lever-operated drum
- Notes: robust, low-maintenance brake system with predictable response.
- System voltage: 12 V
- Battery capacity: 65-90 Ah
- Alternator output: 35-55 A
- Starter motor: 1.6-2.0 kW
- Wiring: industrial-grade wiring harness with sealed connectors
Dashboard indicators:
- oil pressure
- coolant temperature
- battery charging
- LPG fuel level
- hour meter
- parking brake indicator
Drive arrangement:
- Drive wheels: front
- Steer wheels: rear
- Drive type: 2WD
Pneumatic Tires (HTU-model)
- Front: 6.50-10 or 7.00-12
- Rear: 5.00-8
Optional: solid pneumatic, non-marking, traction-grade tires
Chassis Design
- Fully welded heavy-duty steel frame
- Integrated counterweight for load balance
- Reinforced overhead guard
- Anti-slip operator steps
- Rubber engine mounts for vibration control
- Protected hydraulic/electrical routing
- Industrial belly guards for underbody protection
Steering:
- Type: fully hydrostatic steering
- Steering pump output: 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 improved handling on uneven surfaces
- Pump: engine-driven external gear pump
- Flow rate: 35-50 L/min (9-13 gpm)
- Maximum pressure: 15-18 MPa (2,175-2,610 psi)
- Hydraulic reservoir: 22-30 L (23-32 qt)
- Hydraulic oil type: ISO VG 32 / ISO VG 46
- Cylinders:
- dual lift cylinders
- dual tilt cylinders with cushioning
- Control valves: mechanical proportional spool
| 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 reservoir: 22-30 L
Mast
configurations:
- Simplex (1-stage)
- Duplex (2-stage)
- Triplex (3-stage, full free-lift)
Lift height options:
- 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: 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)
Capacity derates with:
- long forks
- tall mast heights
- heavy or offset attachments
- uneven or sloped terrain
- off-center loads
- 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)
- Overall length to fork face: 2.35-2.45 m (92-96 in)
- Overall width: 1.05-1.12 m (41-44 in)
- Overhead guard height: 2.02-2.12 m (80-84 in)
- Wheelbase: 1.45-1.55 m (57-61 in)
- Ground clearance: 110-140 mm (4.3-5.5 in)
- Carriage width: 900-1,000 mm (35-39 in)
- Turning radius: 2.0-2.2 m
- Aisle width (1000x1200 pallet): 3.15-3.45 m
- Maximum fork height: 2.5-5.0 m
- Free lift: 70-600 mm
- Supported fork sizes: 36-72 in
- Operating weight: 2,800-3,300 kg (6,173-7,275 lb)
- Counterweight: 1,300-1,600 kg (2,866-3,527 lb)
250-Hour Service:
- Replace oil and filter
- Clean radiator
- Lubricate mast and steer axle
- Air filter inspection
500-Hour Service:
- Replace Transmission oil
- Inspect drive axle seals
- Clean hydraulic suction strainer
1,000-Hour Service:
- Replace hydraulic fluid and filters
- Replace coolant
- Inspect hoses, cylinders, wiring
- Attachment interface inspection
2,000-Hour Service:
- Full drivetrain inspection
- Steering geometry correction
- Structural mast inspection
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