Komatsu FD18T-21 Specifications
The Komatsu FD18T-21 is a compact 1.8-ton (1,800 kg /
3,960 lb) diesel-powered pneumatic-tire forklift designed for industrial
environments requiring durability, efficient fuel usage, easy maintenance, and
excellent maneuverability.
As part of the Komatsu -21 Series, the FD18T-21
offers upgraded hydraulics, improved operator ergonomics, reduced
vibration levels, and improved service access compared to earlier
models.
The forklift is powered by the Komatsu 4D92E diesel engine, a 2.7-liter
4-cylinder industrial engine known for strong mid-range torque, low fuel
consumption, and exceptional longevity. The 4D92E is widely used across
Komatsu’s compact equipment range including forklifts, skid steers, and
mini-construction machinery.
Technical Data:
- Engine model: Komatsu 4D92E
- Type: inline 4-cylinder, 4-stroke diesel
- Displacement: 2.688-2.746 L
- Bore/stroke: 92x92 mm (3.62x3.62 in)
- Rated output: 28-35 kW (38-47 hp) @ 2,300-2,500 rpm
- Peak torque: 125-155 Nm (92-114 lb-ft) @ 1,600-1,800 rpm
- Fuel system: mechanical in-line injection pump
- Aspiration: naturally aspirated
- Idle speed: 750 ± 50 rpm
- Notes: extremely durable industrial engine intended for continuous daily
operation.
Lubrication System
- System type: wet-sump, full-pressure
- Oil capacity: 6.0-7.0 L (6.3-7.4 qt)
- Oil pressure: 250-400 kPa (36-58 psi)
- Recommended oil: SAE 15W-40 diesel (API CF/CG/CH)
- Oil pump: internal gear-type
- Filter: spin-on full-flow
Cooling System
- Cooling type: liquid-cooled
- Coolant capacity: 7-9 L (7.4-9.5 qt)
- Thermostat: opens at 82°C (180°F)
- Fully open approx.: 95°C (203°F)
- Water pump: belt-driven centrifugal
- Fan: mechanical
- Radiator: heavy-duty fin-tube industrial
- System pressure: 88-108 kPa (13-16 psi)
Transmission
- Type: torque-converter powershift
- Gear selection: 1-2 forward / 1-2 reverse
- Direction selection: mechanical lever or hydraulic shuttle
- 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 housing
- 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 axle
- Oscillation: ±8-10 degrees
- Lubrication capacity: 0.7-1.0 L
Braking System
- Service brakes: hydraulic drum brakes
- Parking brake: mechanical lever-actuated drum
- Notes: durable, simple, and easy to service.
- System voltage: 12 V
- Battery capacity: 65-90 Ah
- Alternator output: 35-50 A
- Starter motor: 1.8-2.2 kW
- Wiring: weather-protected connectors and industrial insulation
Panel indicators:
- oil pressure
- coolant temperature
- charging light
- glow plug indicator
- hour meter
- parking brake indicator
Drive layout:
- Front-wheel drive
- Rear-wheel steering
- Operating mode: 2WD pneumatic-tire forklift
Tires (pneumatic):
- Front: 6.50-10 or 7.00-12
- Rear: 5.00-8
Chassis Features:
- Fully welded steel frame
- Reinforced overhead guard
- Anti-slip entry steps
- Rubber-insulated engine mounts
- Protected hydraulic/electrical routing
Steering:
- Steering method: fully hydrostatic
- 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 to maintain traction
- Pump type: 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 tank: 22-30 L (23-32 qt)
- Fluid specification: ISO VG 32 / VG 46
- Lift cylinders: dual double-acting
- Tilt cylinders: dual with cushioning
- Control valves: manually actuated proportional spool
Supported attachments:
- Sideshift
- Fork-positioner
- Rotator
- Drum clamp
- Bale clamp
- Slip-sheet push-pull
| Service Refill Capacities |
- Engine oil: 6.0-7.0 L
- Coolant: 7-9 L
- Transmission: 6-8 L
- Drive axle: 3.0-4.0 L
- Steer axle: 0.7-1.0 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 fork lengths: 920 mm (36 in) and 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 load: 1,800 kg (3,960 lb)
- Load center: 500 mm (20 in)
Capacity derating occurs with:
- fork extensions
- high mast elevation
- heavy attachments
- side-shifting
- off-center loading
- uneven surfaces
- 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
- Fork compatibility: 36-72 in
- Operating weight: 2,750-3,200 kg (6,060-7,050 lb)
- Counterweight mass: 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 axle seals
- Clean hydraulic suction strainer
1,000-Hour Maintenance:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect hoses, wiring, cylinders
- Inspect attachment interfaces
2,000-Hour Maintenance:
- Full drivetrain inspection
- Steering alignment check
- Structural mast inspection
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