Komatsu FD250Z-6 Specifications
The Komatsu FD250Z-6 is an ultra-heavy-duty
pneumatic-tire industrial forklift designed for extreme material-handling
applications where exceptional lifting strength, wide-load stability, and
continuous-duty reliability are essential. With a nominal lifting capacity of
approximately 25,000 kg (55,000 lb) at a 600 mm (24 in) load center, the
FD250Z-6 belongs to Komatsu’s high-capacity range intended for steel mills,
shipyards, port terminals, mining supply depots, heavy fabrication operations,
foundries, precast and concrete industries, and any environment requiring the
movement of unusually massive loads.
This model is powered by the Cummins 6CT8.3-215, a turbocharged 8.3-liter
inline-six diesel engine widely known for its durability, torque density, and
long service life in industrial and off-highway applications. The engine’s
robust mechanical injection system, large displacement, effective turbocharging,
and strong cooling capacity provide a dependable power source for high-stress
lifting tasks. Komatsu integrates this powerhouse engine with a reinforced
heavy-duty powershift transmission, planetary final-drive axle, oversized
pneumatic tires, and wet-disc braking system to maximize uptime, performance,
and operator confidence.
The FD250Z-6 includes heavy welded-steel frame rails, a massive counterweight
assembly, reinforced mast bulkhead, high-volume multistage hydraulic system,
full hydrostatic steering, and an operator environment designed for visibility
and comfort.
This combination allows the forklift to
maintain smooth load control, predictable handling at height, accurate
positioning, and long-term mechanical endurance. Designed for severe
duty, the FD250Z-6 delivers industrial-grade performance and extended
service life in environments where reliability is mission-critical.
General Technical
Data
Engine model: Cummins 6CT8.3-215
Engine type: inline 6-cylinder, 4-stroke, turbocharged diesel
Displacement: 8.3 L (8300 cc)
Bore: approx. 114 mm
Stroke: approx. 135 mm
Rated output: approx. 160 kW (215 hp) @ 2200 rpm
Peak torque: approx. 880-950 Nm (650-700 lb-ft) @ 1500-1600 rpm
Compression ratio: approx. 17.3:1
Aspiration: turbocharged
Fuel system: mechanical direct-injection
Governor type: mechanical or RSV-type depending on variant
Idle speed: approx. 750-850 rpm
Maximum governed speed: approx. 2200-2300 rpm
Lubrication System
Type: full-pressure lubrication
Oil capacity: approx. 22-27 L (23-29 qt)
Oil pump: gear-driven, high-flow
Filter: spin-on full-flow + optional bypass filter
Oil type: SAE 15W-40 API CI-4/CH-4
Oil cooler: oil-to-water heat exchanger
Cooling System
Cooling type: liquid-cooled
Coolant capacity: approx. 26-32 L (27-34 qt)
Water pump: gear-driven centrifugal
Thermostat: approx. 82°C (180°F)
Fan: heavy mechanical fan with deep shroud
Radiator: oversized industrial core
System pressure: approx. 90-120 kPa (13-17 psi)
Transmission
Type: Komatsu heavy-duty industrial powershift
Speeds: 3 forward / 3 reverse depending on configuration
Travel speed (forward, unladen): approx. 20-28 km/h (12-17 mph)
Travel speed (reverse): approx. 18-25 km/h (11-16 mph)
Transmission oil capacity: approx. 35-45 L (37-47 qt)
Fluid type: Komatsu ATF or Dexron III
Clutch type: oil-immersed multi-disc
Directional control: hydraulic lever
Torque converter: single-stage industrial converter
Drive Axle
Type: heavy cast-steel with planetary final reduction
Differential: industrial bevel-gear
Axle capacity: approx. 30-40 L (32-42 qt)
Lubricant: SAE 80W-90 or 85W-140
Design: engineered for continuous 25-ton operations
Braking System
Service brakes: fully sealed hydraulic wet-disc brakes
Parking brake: mechanical or hydraulic-assist
Wet-disc brakes provide fade resistance, extended life, and minimal
contamination issues.
System voltage: 24 V
Battery configuration: 2 x 12-V industrial batteries
Battery capacity: approx. 100-150 Ah each
Alternator output: approx. 60-90 A
Starter: approx. 6 kW heavy-duty
Electronic systems: engine safety shutdowns, charge warning, temp and oil alarms
Safety interlocks:
- Neutral start
- Overheat alarm
- Low oil pressure alarm
Drive wheels: front
Steering wheels: rear
Drive configuration: 2WD heavy-industrial
Chassis: reinforced welded-steel with heavy boxed sections
Tire Options (Pneumatic)
Front tires: typically 16.00-25 heavy-duty
Rear tires: typically 14.00-24
Optional: solid pneumatic, foam-filled, non-marking compounds
Ground Clearance
Under chassis: approx. 320-420 mm (12.6-16.5 in)
Under mast: approx. 280-380 mm (11-15 in)
Structural Features
Massive counterweight structure
Reinforced mast bulkhead
Heavy-duty cross-members
Protected hydraulic and electrical routing
Steering
Steering type: fully hydrostatic
Steering pump flow: approx. 25-35 L/min
Steering axle: oscillating center-pivot axle
Turning radius: approx. 5.0-6.0 m (197-236 in)
Steering wheel turns: approx. 3.0-4.0 lock-to-lock
System type: open-center industrial hydraulic system
Pump type: high-displacement gear pump
Max hydraulic pressure: approx. 19-22 MPa (2750-3200 psi)
Flow rate: approx. 180-250 L/min (47-66 gpm)
Hydraulic reservoir: approx. 200-250 L (211-264 qt)
Cylinders
Lift cylinders: large double-acting industrial
Tilt cylinders: heavy double-acting with load-holding valves
Valve control: multi-spool mechanical control (electronic optional)
Hydraulic lines: steel tubing with reinforced high-pressure hoses
| Service Refill Capacities |
Engine oil: 22-27 L
Coolant: 26-32 L
Transmission: 35-45 L
Drive axle: 30-40 L
Hydraulic system: 200-250 L
Mast Types
2-stage V-mast
3-stage full-free-lift (FSV) mast
Lift Heights
2-stage: approx. 3000-4000 mm (118-157 in)
3-stage: approx. 4000-6000 mm (157-236 in)
Free Lift
2-stage: approx. 150-300 mm
3-stage: approx. 800-1200 mm
Fork Specifications
Standard fork length: 1220 mm (48 in)
Optional forks: 1524 / 1829 / 2134 / 2400 mm (60 / 72 / 84 / 94 in)
Fork width: 150-200 mm (6-8 in)
Thickness: 60-80 mm (2.4-3.1 in)
Carriage type: ISO Class VI
Attachments: fork-positioner, side-shift, rotator, pipe clamp, block clamp, coil
ram
Rated load capacity: approx. 25,000 kg (55,000 lb)
Load center: 600 mm (24 in)
Capacity derates under:
- long forks
- heavy attachments
- high mast elevations
- extended load center
- forward tilt
Lift speed (unladen): approx. 0.40-0.55 m/s (79-108
ft/min)
Lift speed (laden): approx. 0.25-0.40 m/s (50-80 ft/min)
Lowering speed: approx. 0.50-0.70 m/s
Drawbar pull: approx. 120-160 kN (27,000-36,000 lbf)
Gradeability (unladen): approx. 28-35%
Gradeability (laden): approx. 18-25%
Wheelbase: 3500-3800 mm (138-150 in)
Overall length to fork face: approx. 6800-7200 mm (268-283 in)
Overall width: approx. 3000-3400 mm (118-134 in)
Overhead guard height: approx. 3300-3600 mm (130-142 in)
Mast lowered height: approx. 3600-4200 mm
Mast raised height: approx. 4800-6000 mm
Ground clearance: approx. 320-420 mm
Turning radius: approx. 5.0-6.0 m
Aisle width (1000x1200 pallet): approx. 7.5-8.5 m (295-335 in)
Max fork height: 3.0-6.0 m
Free lift: 150-1200 mm
Fork lengths: 48 / 60 / 72 / 84 / 94 in
Operating weight: approx. 28,000-32,000 kg (61,700-70,500 lb)
Counterweight mass: approx. 10,000-13,000 kg (22,000-28,600 lb)
250-Hour Interval:
- Replace engine oil and filter
- Clean air filters
- Lubricate steer axle and mast
500-Hour Interval:
- Replace transmission filter
- Replace hydraulic return filter
- Inspect axle hubs and seals
1000-Hour Interval:
- Replace ATF
- Replace axle oil
- Fuel filter replacement
- Valve clearance check
- Inspect hydraulic cylinders
2000-Hour Interval:
- Replace hydraulic oil
- Replace coolant
- Mast structural inspection
- Pump pressure test
- Steering axle bushing service
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