Cat GP25NT Specifications
The Caterpillar GP25NT is a 2.5-ton (2,500 kg / 5,500
lb) LPG/petrol pneumatic-tire forklift engineered for high-duty indoor-outdoor
material-handling environments. As a core model of Caterpillar’s NT-Series, the
GP25NT is widely used in distribution centers, production plants, logistics
terminals, pallet-handling facilities, manufacturing lines, agricultural
processing, fabrication shops, and general industrial operations requiring a
compact, efficient, and durable forklift platform.
Two industrial spark-ignition engines are offered for the GP25NT: Nissan K21 - a
2.1-liter, electronically controlled LPG/petrol engine renowned for smooth
torque output, long service life, and reduced fuel consumption. GST GK21 - a
modern LPG industrial engine with electronic fuel-metering, optimized low-end
torque, low emissions, and excellent throttle response.
The GP25NT integrates a heavy-duty welded-steel chassis, industrial powershift
transmission, high-visibility mast system, hydrostatic steering, low-vibration
operator’s compartment, reinforced drive axle, and responsive hydraulic system.
Maintenance access is enhanced with a wide-opening hood, centralized service
points, protected wiring harnesses, intuitive layout, and long-interval filters.
Two spark-ignition powerplants are available: Nissan
K21 or GST GK21.
Nissan K21 - Technical Data
- Engine type: inline 4-cylinder, 4-stroke, spark-ignition
- Displacement: 2.065 L (2,065 cc)
- Bore x stroke: approx. 89 x 100 mm (3.50 x 3.94 in)
- Rated power: approx. 35-42 kW (47-56 hp) @ 2,300-2,600 rpm
- Peak torque: approx. 150-165 Nm (111-122 lb-ft) @ 1,600-1,800 rpm
- Fuel: LPG or petrol depending on region
- Fuel system: electronic fuel injection (EFI)
- Aspiration: naturally aspirated
- Idle speed: 650-750 rpm
- Notes: low vibration, strong reliability, excellent cold-start behavior.
GST GK21 - Technical Data
- Engine type: inline 4-cylinder, 4-stroke LPG
- Displacement: approx. 2.1 L
- Rated power: approx. 35-43 kW (47-58 hp) @ 2,300-2,600 rpm
- Peak torque: approx. 150-175 Nm (111-129 lb-ft)
- Fuel system: electronic LPG injection
- Aspiration: naturally aspirated
- Notes: balanced torque characteristics, reduced emissions, efficient fuel
profile.
Lubrication System (Both Engines)
- System: full-pressure wet-sump
- Oil pump: internal gear-type
- Oil capacity: approx. 3.5-4.5 L (3.7-4.7 qt)
- Normal operating pressure: 250-400 kPa (36-58 psi)
- Recommended oil: SAE 10W-30 or 15W-40
- Filter: spin-on full-flow
- Notes: lubrication system optimized for high-duty low-RPM operation.
Cooling System (Both Engines)
- Cooling type: liquid-cooled
- Coolant capacity: approx. 6-8 L (6.3-8.4 qt)
- Thermostat opens: approx. 82°C (180°F)
- Fully open near: 95°C (203°F)
- Radiator: industrial fin-tube type
- Cooling fan: mechanical belt-driven
- Water pump: belt-driven centrifugal
- System pressure: approx. 88-108 kPa (13-16 psi).
Transmission:
- Type: industrial powershift
- Gear range: 1-2 forward / 1-2 reverse
- Directional control: electric-over-hydraulic shuttle lever
- Unladen speed: approx. 18-20 km/h (11-12 mph)
- Laden speed: approx. 16-18 km/h (10-11 mph)
- Transmission fluid capacity: approx. 8-12 L (8.4-12.7 qt)
- Recommended fluid: Dexron III ATF
- Transmission cooling: oil-to-air heat exchanger
Front Drive Axle:
- Axle type: reinforced rigid industrial axle
- Differential: bevel-gear type
- Oil capacity: approx. 4-5.5 L (4.2-5.8 qt)
- Lubricant: SAE 80W-90
Rear Steer Axle:
- Type: oscillating center-pivot
- Oscillation range: ±8-10 degrees
- Lubrication volume: approx. 1.0-1.5 L
Braking System:
- Service brakes: hydraulic drum brakes
- Parking brake: mechanical hand-lever drum brake
- Optional: oil-cooled wet-disc brakes (region dependent).
- Operating voltage: 12 V
- Battery capacity: approx. 70-110 Ah
- Alternator output: approx. 40-60 A
- Starter motor power: approx. 1.8-2.5 kW
- Electrical harness: protected routing, sealed connectors
Instrument indicators:
- oil pressure
- coolant temp
- charging system
- LPG/petrol level
- parking brake
- hour meter.
Drive
configuration:
- Front-wheel drive
- Rear-wheel steering
- Drive type: 2WD
Tires (Pneumatic):
- Front: 7.00-12 or 28x9-15
- Rear: 6.00-9 or 6.50-10
- Optional: solid pneumatic, non-marking
Chassis:
- Welded high-strength steel frame
- Integrated counterweight
- Reinforced overhead guard
- Anti-slip operator steps
- Rubber engine mounts
- Protected hydraulic/electrical routing
Steering:
- Type: fully hydrostatic steering
- Steering pump flow: approx. 6-12 L/min (1.5-3.2 gpm)
- Steering cylinder: double-acting
- Rear axle: oscillating
- Minimum turning radius: approx. 2.2-2.4 m (86-95 in).
- Pump: engine-driven gear pump
- Hydraulic flow: approx. 45-65 L/min (12-17 gpm)
- Maximum pressure: approx. 17-19 MPa (2,465-2,755 psi)
- Hydraulic tank capacity: approx. 28-35 L (30-37 qt)
- Recommended oil: ISO VG 32 or VG 46
- Lift cylinders: dual double-acting
- Tilt cylinders: dual with cushioning ends
- Valve configuration: mechanical proportional spool
Supported Attachments:
- Side-shift
- Fork-positioner
- Rotator
- Drum/bale clamp
- Push-pull.
| Service Refill Capacities |
- Engine oil: 3.5-4.5 L
- Cooling system: 6-8 L
- Transmission: 8-12 L
- Drive axle: 4-5.5 L
- Steer axle: 1-1.5 L
- Hydraulic tank: 28-35 L
Mast types:
- Simplex (1-stage)
- Duplex (2-stage)
- Triplex (3-stage full free-lift)
Lift height ranges:
- Simplex: 2.5-3.5 m
- Duplex: 3.0-4.5 m
- Triplex: 4.5-6.0 m
Free lift: 80-1,000 mm
Carriage width: 1,000-1,100 mm (39-43 in)
Fork specifications:
- Standard: 1,070 mm (42 in) or 1,220 mm (48 in)
- Optional: 914-1,829 mm (36-72 in)
- Width: 100-125 mm
- Thickness: 35-45 mm
- Fork class: ITA Class II or III.
- Rated capacity: 2,500 kg (5,500 lb)
- Load center: 500 mm (20 in)
Derating factors:
- tall masts
- long forks
- hydraulic attachments
- side-shift use
- uneven loads
- uneven terrain.
- Lift speed (unladen): 0.45-0.60 m/s
- Lift speed (laden): 0.28-0.45 m/s
- Lowering speed: 110-160 ft/min
- Gradeability (unladen): approx. 18-25%
- Gradeability (laden): approx. 12-20%
- Drawbar pull: approx. 12,000-17,000 N (2,700-3,800 lbf)
- Overall length to fork face: approx. 2.5-2.7 m
(98-106 in)
- Overall width: approx. 1.15-1.20 m (45-47 in)
- Overhead guard height: approx. 2.1-2.2 m (83-87 in)
- Wheelbase: approx. 1.55-1.65 m (61-65 in)
- Ground clearance: approx. 110-140 mm (4.3-5.5 in)
- Turning radius: approx. 2.2-2.4 m
- Aisle width (pallet 1000x1200): approx. 3.5-3.8 m
- Maximum fork height: 2.5-6.0 m
- Free lift: 80-1,000 mm
- Fork lengths supported: 36-72 in
- Operating weight: approx. 3,600-4,200 kg (7,930-9,250 lb)
- Counterweight mass: approx. 1,700-2,100 kg (3,750-4,630 lb)
250-Hour Interval:
- Engine oil and filter replacement
- Mast and steer-axle lubrication
- Radiator cleaning
- Air filter inspection
500-Hour Interval:
- Transmission fluid change
- Driveline inspection
- Hydraulic suction strainer cleaning
1,000-Hour Interval:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect hoses/cylinders/wiring
2,000-Hour Interval:
- Full drivetrain inspection
- Steering alignment
- Mast structural inspection
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