Komatsu FG18T-21 Specifications
The Komatsu FG18T-21 is a 1.8-ton (1,800 kg / 3,960 lb)
LPG/petrol pneumatic-tire forklift engineered for small-to-medium industrial
operations requiring excellent maneuverability, low vibration, fuel-efficient
performance, and long-term mechanical durability. As part of Komatsu’s 21
Series, the FG18T-21 improves upon earlier designs with upgraded operator
ergonomics, improved hydraulic response, refined engine management (EFI
variants), and enhanced service accessibility.
Powered by the Nissan K15 industrial engine - a proven 1.5-liter, 4-cylinder
spark-ignition engine widely used in industrial forklifts - this model offers
smooth torque delivery, excellent throttle response, low emissions, and the
durability required for multi-shift usage. The FG18T-21 integrates a
torque-converter powershift transmission, hydrostatic steering, efficient
engine-driven hydraulic pump, and a robust welded-steel chassis capable of
operating both indoors and outdoors on moderately uneven surfaces.
Compact dimensions, strong visibility lines, and predictable handling make it a
preferred choice in warehouses, production plants, distribution facilities,
light outdoor yards, and retail logistics environments.
Technical Data:
- Engine model: Nissan K21 Industrial
- Configuration: inline 4-cylinder, 4-stroke, spark-ignition
- Displacement: 1.499 L (1,499 cc)
- Bore/stroke: 73x89 mm (2.87x3.50 in)
- Rated output: 25-30 kW (34-40 hp) @ 2,500-2,700 rpm
- Peak torque: 105-120 Nm (77-89 lb-ft) @ 1,600-1,800 rpm
- Fuel: LPG or gasoline
- Fuel system: carburetor or EFI (market-dependent)
- Aspiration: naturally aspirated
- Idle speed: 650-750 rpm
- Engine characteristics: extremely reliable, fuel-efficient, low emissions,
smooth low-RPM power.
Lubrication System
- Lubrication type: full-pressure wet-sump
- Oil capacity: 3.0-4.0 L (3.2-4.2 qt)
- Oil type: SAE 10W-30 / 15W-40
- Oil pressure (normal): 250-400 kPa (36-58 psi)
- Oil filter: spin-on full-flow
- Notes: high reliability due to simple, robust lubrication circuit.
Cooling System
- Cooling method: liquid-cooled
- Coolant capacity: 6-8 L (6.3-8.4 qt)
- Thermostat opening temperature: 82°C (180°F)
- Fully open: 95°C (203°F)
- Water pump: belt-driven centrifugal
- Cooling fan: mechanical
- System pressure: 88-108 kPa (13-16 psi)
- Notes: stable temperature control ensures continuous operation in hot
environments.
Transmission
- Type: torque-converter powershift
- Gear arrangement: 1-2 forward / 1-2 reverse
- Direction selection: 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 cooler
Front Drive Axle
- Type: rigid industrial axle
- Differential: bevel-gear type
- Lubrication capacity: 3.0-4.0 L (3.2-4.2 qt)
- Lubricant: SAE 80W-90
- Notes: durable axle design suitable for long-term outdoor use.
Rear Steer Axle
- Type: oscillating center-pivot
- Oscillation: ±8-10 degrees
- Lubrication capacity: 0.7-1.0 L
- Notes: improves shock absorption and stability on uneven surfaces.
Braking System
- Service brakes: hydraulic drum
- Parking brake: mechanical lever
- Notes: reliable, easy-service braking system with predictable stopping force.
- System voltage: 12 V
- Battery capacity: 65-90 Ah
- Alternator output: 30-50 A
- Starter motor: 1.4-1.8 kW
- Wiring: sealed connectors, abrasion-resistant insulation
Standard indicators:
- engine oil pressure
- coolant temperature
- battery charging indicator
- LPG/petrol fuel gauge
- hour meter
- parking brake lamp
Drive layout:
- Drive wheels: front
- Steer wheels: rear
- Drive type: 2WD pneumatic-tire forklift
Tires (pneumatic):
- Front: 6.50-10 or 7.00-12
- Rear: 5.00-8
Chassis and Frame:
- Fully welded steel chassis
- Reinforced overhead guard
- Protective belly pans
- Anti-slip steps
- Rubber engine mounts reduce vibration
- Protected hydraulic and electrical routing
Steering:
- Steering type: fully hydrostatic
- 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 uneven floors
- Notes: light steering effort and excellent maneuverability.
- Pump type: external gear pump (engine-driven)
- Flow output: 35-50 L/min (9-13 gpm)
- Maximum pressure: 15-18 MPa (2,175-2,610 psi)
- Hydraulic reservoir: 22-28 L (23-30 qt)
- Oil specification: ISO VG 32 / ISO VG 46
Cylinders:
- dual lift cylinders
- dual tilt cylinders (with cushioning)
- Valve type: mechanical proportional spool
Supported attachments:
- Side-shift
- Fork-positioner
- Rotator
- Drum clamp
- Bale clamp
- Slip-sheet push-pull
- General indoor/outdoor attachments
| Service Refill Capacities |
- Engine oil: 3.0-4.0 L
- Cooling System: 6-8 L
- Transmission: 6-8 L
- Drive axle: 3.0-4.0 L
- Steer axle: 0.7-1.0 L
- Hydraulic tank: 22-28 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
- Fork thickness: 35-40 mm
- Fork class: ITA Class II
- Rated capacity: 1,800 kg (3,960 lb)
- Load center: 500 mm (20 in)
Capacity derating occurs with:
- high mast elevation
- long forks
- heavy attachments
- side-shift offset
- rough/uneven surfaces
- 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)
- Length to fork face: 2.35-2.45 m (92-96 in)
- 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 forks: 36-72 in
- Operating weight: 2,750-3,200 kg (6,060-7,050 lb)
- Counterweight: 1,250-1,550 kg (2,755-3,415 lb)
250-hour
maintenance:
- Replace engine oil and filter
- Clean radiator
- Lubricate mast and steer axle
- Inspect air filter
500-hour maintenance:
- Replace Transmission oil
- Inspect drive axle seals
- Clean hydraulic suction strainer
1,000-hour maintenance:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect hoses, cylinders, wiring
- Check attachment mounts
2,000-hour maintenance:
- Full drivetrain inspection
- Steering alignment
- Structural mast inspection
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