Komatsu FG18ST-17 Specifications
The Komatsu FG18ST-17 is a compact 1.8-ton (1,800 kg /
3,960 lb) LPG/petrol cushion-tire forklift engineered for intensive indoor
material-handling operations requiring precise maneuverability, quiet operation,
and stable performance. As part of the Komatsu 17 Series, the FG18ST-17 is
optimized for warehouse and factory applications where smooth surfaces and tight
turning aisles demand a cushion-tire machine rather than a pneumatic model.
The forklift is powered by the Nissan K21 industrial engine, a 2.1-liter,
4-cylinder spark-ignition engine known for excellent durability, smooth
mid-range torque, low emissions, fuel efficiency, and a long service life. The
model integrates a torque-converter powershift transmission, responsive
hydrostatic steering, robust hydraulic system, welded-steel chassis, and a
carefully designed operator environment featuring excellent visibility and
ergonomic controls.
Its compact dimensions, tight turning radius, and low vibration make the
FG18ST-17 especially well-suited for warehouses, food-processing environments,
bottling facilities, manufacturing floors, and distribution centers.
Technical Data:
- Engine model: Nissan K21 Industrial
- Engine type: 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 type: LPG or gasoline
- Fuel system: EFI or mixer-type (production-year dependent)
- Aspiration: naturally aspirated
- Idle speed: 650-750 rpm
- Notes: durable, smooth-running, excellent for multi-shift indoor operation.
Lubrication System
- System type: wet-sump, full-pressure
- Oil pump: internal gear-type
- Oil capacity: 4.0-4.5 L (4.2-4.8 qt)
- Recommended oil: SAE 10W-30 or 15W-40
- Normal oil pressure: 250-400 kPa (36-58 psi)
- Filtration: full-flow spin-on filter
Cooling System
- Cooling method: 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)
- Radiator: fin-tube type
- Fan: mechanical
- Water pump: centrifugal
- System pressure: 88-108 kPa (13-16 psi)
Transmission
- Type: torque-converter powershift
- Gear arrangement: 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 oil: Dexron II/III ATF
- Cooling: integrated oil-cooler
Front Drive Axle
- Construction: rigid steel axle
- Differential: bevel-gear
- Oil capacity: 3-4 L (3.2-4.2 qt)
- Lubricant: SAE 80W-90
Rear Steer Axle
- Type: oscillating center-pivot axle
- Oscillation: ±7-9 degrees
- Lubrication capacity: 0.7-1.0 L
Braking System
- Service brakes: hydraulic drum brakes
- Parking brake: mechanical lever-actuated drum
- Notes: simple, durable, indoor-friendly brake design.
- Nominal voltage: 12 V
- Battery: 65-90 Ah
- Alternator: 35-55 A
- Starter motor: 1.6-2.0 kW
- Harness type: sealed connectors, industrial insulation
Operator panel indicators:
- oil pressure
- coolant temperature
- charging system
- fuel level (LPG/petrol)
- hour meter
- parking brake
Drive system:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2WD cushion-tire forklift
Cushion Tire Setup
- Front tires: 21x7-15
- Rear tires: 16x6-10.5
Optional variants: non-marking compounds, high-traction indoor tires
Chassis Construction:
- Fully welded industrial steel frame
- Integrated rear counterweight
- Reinforced overhead guard
- Anti-slip operator entry steps
- Rubber engine-mount isolation
- Protected routing of hydraulic and electrical lines
Steering:
- Type: fully hydrostatic
- Pump flow rate: 5-8 L/min (1.3-2.1 gpm)
- Steering cylinder: double-acting
- Turning radius: 1.9-2.1 m (75-83 in)
- Rear axle: oscillating
- Notes: extremely tight turning suited for warehouse aisles.
- 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: 22-28 L (23-30 qt)
- Oil spec: ISO VG 32 / VG 46
- Cylinders:
- dual lift cylinders
- dual cushioned tilt cylinders
- Control valves: mechanical spool valves
Supported attachments:
- Side-shift
- Fork-positioner
- Rotator
- Bale/drum clamp
- Slip-sheet push-pull
| Service Refill Capacities |
- Engine oil: 4.0-4.5 L
- Cooling System: 7-9 L
- Transmission: 6-8 L
- Drive axle: 3-4 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 heights:
- 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 forks: 920 mm (36 in), 1,070 mm (42 in)
- Optional forks: 1,220-1,829 mm (48-72 in)
- Width: 100-125 mm
- Thickness: 35-40 mm
- ITA fork class: Class II
- Rated capacity: 1,800 kg (3,960 lb)
- Load center: 500 mm (20 in)
Capacity derating occurs with:
- long forks
- high mast heights
- heavy/offset attachments
- side-shift offset
- uneven floor conditions
- 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: 2.30-2.45 m (91-96 in)
- Overall width: 1.00-1.05 m (39-41 in)
- Overhead guard height: 1.95-2.05 m (77-81 in)
- Wheelbase: 1.40-1.50 m (55-59 in)
- Ground clearance: 100-115 mm (3.9-4.5 in)
- Carriage width: 900-1,000 mm (35-39 in)
- Turning radius: 1.9-2.1 m
- Aisle width (pallet 1000x1200): 3.0-3.3 m
- Maximum fork height: 2.5-5.0 m
- Free lift: 70-600 mm
- Supported fork lengths: 36-72 in
- Operating weight: 2,450-2,900 kg (5,400-6,400 lb)
- Counterweight: 1,150-1,380 kg (2,535-3,040 lb)
250-hour:
- Replace engine oil and filter
- Clean radiator
- Lubricate mast and steer axle
- Air filter inspection
500-hour:
- Replace Transmission oil
- Inspect axle seals
- Clean hydraulic suction strainer
1,000-hour:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect hoses, cylinders, wiring
2,000-hour:
- Full drivetrain inspection
- Steering alignment
- Mast structural inspection
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