Cat GP15N Specifications
The Caterpillar GP15N is a compact 1.5-ton (1,500 kg /
3,300 lb) LPG/petrol-powered pneumatic-tire forklift engineered for
light-to-medium material-handling operations in warehouses, production
facilities, logistics centers, small distribution depots, retail stock areas,
and mixed indoor/outdoor applications. Designed as the smallest model in the
GP-N series, the GP15N emphasizes highly maneuverable operation, low fuel
consumption, compact dimensions, low vibration, and dependable day-to-day
performance.
Equipped with the GST GK21E 2.1-liter LPG spark-ignition engine, the GP15N
benefits from refined, smooth combustion characteristics, strong throttle
response, low vibration, and reliable cold-start performance. The forklift
integrates a welded-steel chassis, industrial powershift transmission,
hydrostatic steering, high-visibility mast design, durable pneumatic tires, and
a balanced counterweight system.
Operators benefit from an ergonomic control
layout, isolated operator platform, low step height, and smooth
hydraulic modulation. Maintenance technicians enjoy excellent access to
the engine bay, centralized filter placement, and long service
intervals.
The Caterpillar GP15N is equipped with the GST GK21E
engine—a 2.1-liter industrial pulse-controlled LPG spark-ignition engine
designed specifically for forklifts.
GST GK21E - Technical Specifications:
- Engine type: inline 4-cylinder, 4-stroke LPG spark ignition
- Displacement: 2.1 liters (2,065 cc / 126 cu in)
- Bore x stroke: approx. 89 x 76 mm (3.50 x 2.99 in)
- Maximum power: approx. 38-45 kW (51-60 hp) @ 2,400-2,600 rpm
- Peak torque: approx. 150-170 Nm (111-125 lb-ft) @ 1,600-1,800 rpm
- Fuel system: electronically controlled LPG vaporizer/mixer
- Ignition: distributorless electronic ignition (EDIS)
- Aspiration: naturally aspirated
- Idle speed: approx. 750 ± 50 rpm
- Emissions: Tier-compliant industrial LPG engine
The GK21E engine provides smooth, reliable power with minimal noise and
vibration—beneficial for indoor operations requiring low emissions and stable
low-speed torque.
Lubrication System:
- System type: full-pressure lubrication
- Oil pump: internal gear-driven pump
- Oil capacity: approx. 3.7-4.2 L (3.9-4.4 qt)
- Normal oil pressure: approx. 280-420 kPa (41-61 psi)
- Recommended oil: SAE 10W-30 or 15W-40 (API SJ/SL/SM)
- Filter: spin-on full-flow oil filter
Cooling System:
- Cooling type: liquid-cooled
- Coolant capacity: approx. 6-7.5 L (6.3-7.9 qt)
- Thermostat opening temperature: approx. 82°C (180°F)
- Fully open temperature: approx. 95°C (203°F)
- Radiator: heavy-duty fin-tube radiator
- Water pump: belt-driven centrifugal pump
- Cooling fan: mechanical, engine-driven
- System pressure: approx. 88-108 kPa (13-16 psi)
The cooling system maintains consistent engine temperature under frequent
stop-and-go cycles.
Transmission:
- Type: industrial powershift
- Forward gears: 1-2
- Reverse gears: 1-2
- Travel speed unladen: approx. 17-18 km/h (10-11 mph)
- Travel speed laden: approx. 15-16 km/h (9-10 mph)
- Transmission fluid capacity: approx. 6-8 L (6.3-8.4 qt)
- Recommended fluid: Dexron III ATF
- Transmission cooling: integrated oil-to-air cooler
Drive Axle:
- Type: rigid industrial front drive axle
- Differential: bevel-gear differential
- Axle oil capacity: approx. 3.5-5.0 L (3.7-5.3 qt)
- Recommended lubricant: SAE 80W-90 gear oil
Steer Axle:
- Type: oscillating rear axle with single-pivot mount
- Oscillation: approx. ±8-10 degrees
- Lubricant capacity: approx. 1.0-1.5 L
Braking System:
- Service brakes: hydraulic drum brakes (dual leading-shoe)
- Parking brake: mechanical lever-actuated drum
- Brake actuation: hydraulic master cylinder.
- System voltage: 12 volts
- Battery capacity: approx. 70-90 Ah
- Alternator output: approx. 40-60 A
- Starter motor: approx. 1.8-2.5 kW
- Electrical harness: sealed connectors, protected routing
Dash indicators include:
- engine oil pressure
- coolant temperature
- charging system
- LPG fuel level (LPG only)
- hour meter
- parking brake indicator
The electrical system is designed to resist moisture, dust, and vibration in
industrial environments.
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2WD pneumatic-tire forklift
Tire Specifications (Pneumatic):
- Front tires: approx. 6.50-10
- Rear tires: approx. 5.00-8
- Optional: solid pneumatic tires
- Optional: non-marking warehouse tires
Chassis Construction:
- Heavy-duty welded steel frame
- Integrated counterweight
- High-strength overhead guard
- Protected hydraulic and electrical lines
- Anti-slip steps and ergonomic handholds
Steering:
- Type: fully hydrostatic power steering
- Steering pump flow: approx. 6-10 L/min (1.5-2.6 gpm)
- Steering cylinder: double-acting
- Steer axle: oscillating rear axle
- Turning radius: approx. 1.8-2.0 m (71-79 in)
Hydrostatic steering provides excellent control, especially in tight indoor
warehouse aisles.
- Pump type: engine-driven gear pump
- Pump flow: approx. 35-55 L/min (9-14.5 gpm)
- Maximum pressure: approx. 17-19 MPa (2,500-2,750 psi)
- Hydraulic reservoir: approx. 20-28 L (21-30 qt)
- Recommended fluid: ISO VG 32 or VG 46 hydraulic oil
- Lift cylinders: dual double-acting cylinders
- Tilt cylinders: dual cylinders with cushioning features
Optional Hydraulic Attachments:
- Side-shift
- Fork-positioner
- Rotator
- Drum clamp
- Bale clamp
- Push-pull.
| Service Refill Capacities |
- Engine oil: 3.7-4.2 L (3.9-4.4 qt)
- Cooling system: 6-7.5 L (6.3-7.9 qt)
- Transmission fluid: 6-8 L (6.3-8.4 qt)
- Drive axle oil: 3.5-5.0 L (3.7-5.3 qt)
- Steer axle lubrication: 1-1.5 L (1.0-1.6 qt)
- Hydraulic tank: 20-28 L (21-30 qt).
Mast Types
Available:
- Simplex (1-stage)
- Duplex (2-stage)
- Triplex (3-stage full free-lift)
Typical Lift Heights:
- Simplex: 2.5-3.0 m (98-118 in)
- Duplex: 3.0-4.5 m (118-177 in)
- Triplex: 4.5-6.0 m (177-236 in)
Free Lift: 80-600 mm (3-24 in) depending on mast selection
Carriage Width: 850-950 mm (33-37 in)
Fork Specifications:
- Standard fork length: 1,070 mm (42 in) or 1,220 mm (48 in)
- Optional lengths: 914-1,829 mm (36-72 in)
- Fork width: approx. 100-125 mm (4-5 in)
- Fork thickness: approx. 35-45 mm (1.4-1.8 in)
- Fork class: ITA Class II.
- Rated lifting capacity: 1,500 kg (3,300 lb)
- Load center: 500-600 mm (20-24 in)
De-rating conditions:
- high lift heights
- side-shift or fork-positioner installations
- long forks
- off-center loads
- heavy attachments.
- Lift speed (unladen): approx. 0.45-0.55 m/s (90-110
ft/min)
- Lift speed (laden): approx. 0.28-0.40 m/s (55-80 ft/min)
- Lowering speed: approx. 110-150 ft/min
- Gradeability (unladen): approx. 18-22%
- Gradeability (laden): approx. 12-18%
- Drawbar pull: approx. 10,000-14,000 N (2,250-3,150 lbf).
- Overall length to fork face: approx. 2.1-2.3 m (83-91
in)
- Overall width: approx. 1.05-1.12 m (41-44 in)
- Overhead guard height: approx. 2.1-2.2 m (83-87 in)
- Wheelbase: approx. 1.35-1.45 m (53-57 in)
- Ground clearance: approx. 90-110 mm (3.5-4.3 in)
- Turning radius: approx. 1.8-2.0 m (71-79 in)
- Aisle width (1000x1200 pallet): approx. 3.1-3.4 m (122-134 in)
- Maximum fork height: 2.5-6.0 m
- Free lift: 80-600 mm
- Fork lengths: 36-72 in
- Operating weight: approx. 2,900-3,300 kg (6,390-7,275 lb)
- Counterweight: approx. 1,200-1,500 kg (2,645-3,300 lb).
250-Hour Intervals:
- Replace engine oil and filter
- Clean radiator fins
- Lubricate mast and steer axle pivots
- Inspect engine air filter
500-Hour Intervals:
- Replace transmission oil
- Inspect drive axle seals
- Clean hydraulic suction screen
1,000-Hour Intervals:
- Replace hydraulic oil and all filters
- Replace coolant
- Inspect hoses and cylinder seals
- Check driveline couplings and steering linkage
2,000-Hour Intervals:
- Complete drivetrain inspection
- Steering geometry verification
- Full mast structural inspection.
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