Komatsu FD25-11 Specifications
The Komatsu FD25-11 is a 2.5-ton (2,500 kg / 5,500 lb)
diesel pneumatic-tire forklift designed for high-reliability material-handling
operations in industrial, construction, agricultural, and logistics
environments. As part of the early Komatsu 11-Series, the FD25-11 established a
strong reputation for durability, excellent load stability, efficient fuel
usage, and long-term service life.
Powered by the Komatsu-licensed 4D95S diesel engine, this model provides
consistent torque at low RPM, easy cold-starting, simplified service access, and
dependable performance under heavy loads. The forklift incorporates a welded
steel chassis, industrial torque-converter transmission, hydrostatic steering,
load-sensing hydraulics, a reinforced mast assembly, and a balanced
counterweight structure.
The operator compartment is designed with clear
visibility, intuitive mechanical controls, a supportive seat, and low
vibration levels. The FD25-11 remains a widely trusted machine in
numerous industries due to its mechanical simplicity, strength, and ease
of maintenance.
General Technical
Data
Engine model: Komatsu 4D95S
Engine type: inline 4-cylinder, 4-stroke, naturally aspirated diesel
Displacement: approx. 2.985 L (2,985 cc)
Bore/stroke: approx. 95x115 mm (3.74x4.53 in)
Rated output: approx. 36-43 kW (48-58 hp) @ 2,200-2,500 rpm
Peak torque: approx. 165-185 Nm (122-136 lb-ft) @ 1,600-1,800 rpm
Fuel system: mechanical in-line injection pump
Aspiration: naturally aspirated
Combustion chamber: swirl-type
Idle speed: approx. 750 ± 50 rpm
Known for: strong mid-range torque, excellent reliability, extremely long
service life.
Lubrication System
- Type: full-pressure wet-sump
- Oil pump: internal gear-type
- Oil capacity: approx. 7.0-8.0 L (7.4-8.5 qt)
- Normal pressure: 250-400 kPa (36-58 psi)
- Recommended oil: SAE 15W-40 diesel oil (API CF/CG/CH)
- Filter: full-flow spin-on cartridge
Cooling System
- Cooling method: liquid-cooled, pressurized
- Coolant capacity: approx. 9-11 L (9.5-11.6 qt)
- Thermostat opening: approx. 82°C (180°F)
- Fully open: approx. 95°C (203°F)
- Radiator: fin-tube copper/brass or aluminum core
- Water pump: belt-driven centrifugal
- Fan: mechanical engine-driven
- System pressure: approx. 88-108 kPa (13-16 psi)
Transmission
- Type: torque-converter powershift
- Gears: 1-2 forward / 1-2 reverse
- 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: approx. 8-12 L (8.4-12.7 qt)
- Fluid type: Dexron II/III ATF or Komatsu powershift fluid
- Cooling: oil-to-air cooler integrated in radiator assembly
Front Drive Axle
- Construction: rigid cast-steel housing
- Differential: bevel-gear industrial differential
- Axle oil capacity: approx. 4.5-6.0 L (4.7-6.3 qt)
- Lubricant: SAE 80W-90 gear oil
Rear Steer Axle
- Type: center-pivot oscillating axle
- Oscillation: approx. ±8-10 degrees
- Lubrication volume: approx. 1.0-1.5 L
Braking System
- Service brakes: hydraulic drum brakes
- Parking brake: mechanical hand-lever drum
- System voltage: 12 V
- Battery capacity: 70-110 Ah
- Alternator rating: 40-60 A
- Starter motor: 2.5-3.0 kW
- Indicators: oil pressure, coolant temperature, charge warning, glow plug, hour
meter, parking brake
Drive layout: 2WD, front drive / rear steer
Frame structure: heavy-duty welded steel with integrated counterweight
Tires (Pneumatic)
- Front: 7.00-12 or 28x9-15
- Rear: 6.00-9
Steering
- Type: fully hydrostatic steering
- Pump flow: approx. 6-10 L/min
- Minimum turning radius: approx. 2.2-2.4 m
- Pump: engine-driven external gear pump
- Flow rate: approx. 45-65 L/min
- Max pressure: approx. 16-18 MPa (2,320-2,610 psi)
- Hydraulic reservoir: approx. 28-35 L
| Service Refill Capacities |
- Engine oil: 7.0-8.0 L
- Cooling system: 9-11 L
- Transmission: 8-12 L
- Drive axle: 4.5-6.0 L
- Steer axle: 1-1.5 L
- Simplex, Duplex, Triplex masts
- Lift height range: 2.5-6.0 m
- Free lift: 70-1,000 mm
- Fork lengths: 36-72 in
- Fork class: Class II/III
Rated capacity: 2,500 kg (5,500 lb)
Load center: 500 mm (20 in)
- Lift speed (unladen): 0.45-0.60 m/s
- Lift speed (laden): 0.28-0.45 m/s
- Gradeability (laden): 12-20%
- Length to fork face: 2.55-2.70 m
- Width: 1.15-1.20 m
- Height (O/H guard): 2.10-2.20 m
- Turning radius: 2.2-2.4 m
- Aisle requirement: 3.5-3.8 m
- Operating weight: 3,700-4,200 kg
Daily checks: oil, coolant, hydraulic, forks, chains,
tires
250h: engine oil/filter, radiator cleaning
500h: transmission service, driveline inspection
1,000h: hydraulic fluid, coolant, hoses
2,000h: full inspection, mast structural checks
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