Clark GCX25 Specifications
The Clark GCX25 is a mid-capacity pneumatic-tire
internal-combustion forklift designed for a wide range of industrial
applications requiring dependable traction, balanced performance, and refined
hydraulic control. With a rated lifting capacity of 2,500 kg (5,000 lb), the
GCX25 occupies a central role within Clark’s GCX pneumatic-tire series as a
versatile and durable work platform suited to both indoor and light outdoor
conditions.
Its pneumatic-tire configuration offers
improved shock absorption and adaptability when operating over mixed
surfaces such as uneven pavement, cracked concrete, warehouse yards,
construction supply depots, recycling centers, and transitional work
zones. The GCX25 is widely known for its load stability, predictable
steering characteristics, strong mast rigidity, and extended component
service life.
The machine incorporates a fully welded steel chassis engineered to
manage repetitive load cycles, a reinforced mast structure designed for
high visibility and reduced deflection, and a heavy-duty driveline that
maintains consistent torque transfer under demanding conditions.
The operator compartment prioritizes
visibility, comfort, and ergonomic control layout, supporting hours of
continuous operation with reduced operator fatigue. Technicians benefit
from the GCX25’s straightforward service access, simplified hydraulic
and electrical routing, and industrial-grade powertrain components
engineered for longevity.
The Clark GCX25 is available with two industrial engine
options: the Waukesha 2.9-liter LPG/Gasoline engine and the Continental TM27
2.7-liter LPG/Gasoline engine. Both engines are long-established industrial
power units known for durability, smooth torque delivery, and consistent low-RPM
performance suitable for precise load handling. Both options are configured for
mixed indoor-outdoor duty cycles and maintain stable operation over extended
shifts.
Engine Option (Waukesha 2.9L LPG/Gasoline):
- Configuration: inline 4-cylinder, 4-stroke OHV industrial engine
- Displacement: approx. 2.9 L
- Power output: approx. 45-60 kW (60-80 hp)
- Peak torque: approx. 140-165 lb-ft (190-224 Nm)
- Rated operating speed: approx. 2,500-2,700 rpm
- Idle speed: approx. 750-850 rpm
- Fuel type: LPG or gasoline
- Induction: mixer-type LPG vapor induction or gasoline carburetor
- Ignition: distributor-type with industrial-grade coil and ignition module
- Cooling: liquid-cooled with heavy-duty pump and multi-row radiator
Engine Option (Continental TM27 2.7L
LPG/Gasoline):
- Displacement: approx. 2.7 L
- Power output: approx. 45-55 kW (60-74 hp)
- Peak torque: approx. 135-155 lb-ft (183-210 Nm)
- Governed speed: approx. 2,600-2,800 rpm
- Idle speed: approx. 750-850 rpm
- Fuel type: LPG or gasoline
- Fuel system: mixer-regulated vapor delivery (LPG) or carbureted gasoline
variant
Engine Construction:
- Cast-iron deep-ribbed block providing torsional rigidity
- Reinforced cast-iron cylinder head with heat-resistant valves
- Forged-steel crankshaft operating on multiple main bearings
- Precision-machined connecting rods designed for long-cycle durability
- Aluminum pistons with thermal expansion skirts and oil-cooled undersides
- Positive crankcase ventilation system for emissions-controlled operation
Fuel System:
- LPG vapor-draw mixer system with vacuum-controlled regulator
- Gasoline carburetion system available on specific variants
- Multi-stage filtration including primary screening and fine-element filtration
- LPG lock-off solenoid for safety shutdown
- Mechanical or electric fuel pump depending on fuel type
Lubrication System:
- Full-pressure wet-sump lubrication
- Gear-type crankshaft-driven oil pump
- Oil capacity: approx. 4.0-5.0 L (4.2-5.3 qt)
- Typical operating oil pressure: 200-380 kPa (29-55 psi)
- Recommended oil grade: SAE 10W-30 or 15W-40 high-detergent industrial oil
- Spin-on full-flow oil filter with bypass protection
- Internal oil galleries providing lubrication to crankshaft, bearings,
camshaft, and valve train
Cooling System:
- Liquid-cooled forced-circulation system
- Belt-driven centrifugal water pump
- Multi-row industrial radiator with high-capacity airflow
- Coolant capacity: approx. 7-8 L (7.4-8.4 qt)
- Thermostat opening temperature: approx. 82°C (180°F)
- Cooling system pressure: approx. 13-15 psi (90-103 kPa)
The GCX25 incorporates a torque-converter-based
powershift transmission designed for high-frequency directional transitions and
low-speed control. The transmission provides controlled torque delivery at low
speeds, stable acceleration under load, and minimal driveline shock.
Transmission:
- Type: torque-converter powershift
- Speeds: forward and reverse; available in single-speed and dual-speed variants
- Forward travel speed (unladen): approx. 16-18 km/h (10-11 mph)
- Reverse travel speed: approx. 14-16 km/h (9-10 mph)
- Transmission fluid capacity: approx. 6-7 L (6.3-7.4 qt)
- Recommended fluid: Dexron III or Clark-approved ATF
- Direction change mechanism: lever-actuated hydraulic clutch packs with
controlled engagement
- Integrated transmission oil cooler designed for extended duty cycles
Drive Axle:
- High-strength cast-steel differential housing
- Planetary reduction wheel hubs distributing torque efficiently
- Axle lubricant capacity: approx. 4-5 L (4.2-5.3 qt)
- Gear oil type: SAE 80W-90 or 85W-140 depending on climate
- Differential design optimized for industrial torque loads
Brake System:
- Oil-immersed wet-disc brakes offering exceptional durability
- Self-adjusting internal brake design reducing maintenance frequency
- Parking brake: mechanical lever-actuated system
- Wet-disc configuration provides resistance to dust, debris, and moisture
contamination
- System voltage: 12 V DC
- Battery capacity: approx. 80-100 Ah depending on equipment level
- Alternator output: approx. 55-75 A industrial-rated
- Starter motor: approx. 1.7-2.5 kW with reduction gearing
- Primary electrical harness: heavy-duty insulated wiring with abrasion
protection
- Safety systems: operator-presence switch, neutral-start interlock, LPG
lock-off circuit
- Lighting package: halogen or LED headlights, tail lamps, combination mast
lights, optional beacon light, and overhead work lighting
Drive System:
- Drive wheels: front-wheel drive arrangement
- Steering wheels: rear
- Drive type: 2-wheel-drive pneumatic-tire configuration optimized for
mixed-terrain environments
Tire Specifications (Pneumatic):
- Front tires: approx. 28x9-15 pneumatic industrial tires
- Rear tires: approx. 6.50x10 pneumatic tires
Optional Tires:
- Solid pneumatic for durability on debris-heavy surfaces
- Outdoor tread patterns for improved grip
- Non-marking compounds for specialized indoor environments
Chassis Architecture:
- Fully welded steel frame with deep-section rails
- Reinforced mast base and tilt cylinder mounts
- Centralized weight distribution for stable handling
- Protected hydraulic lines, electrical routing, and driveline components
Steering:
- Steering type: fully hydrostatic system
- Pump flow rate: approx. 10-13 L/min (2.6-3.4 gpm)
- Oscillating rear steer axle with heavy-duty pivot bushings
- Turning radius: approx. 2.1-2.4 m (83-95 in)
- Steering characteristics: light effort, high responsiveness, stable under load
- Maximum hydraulic system pressure: approx.
2,300-2,600 psi (159-179 bar)
- Pump type: engine-driven external gear pump
- Pump flow: approx. 35-55 L/min (9-14.5 gpm)
- Hydraulic reservoir: approx. 22-26 L (23-27 qt)
- Hydraulic fluid: ISO VG 32 or ISO VG 46 depending on climate
- Lift cylinders: double-acting cylinders with high-strength rods
- Tilt cylinders: dual cylinders with relief-protected circuits
- Auxiliary hydraulic options: sideshifter, fork-positioner, paper clamp, carton
clamp, rotator, and other specialty attachments
| Service Refill Capacities |
- Engine oil: approx. 4-5 L (4.2-5.3 qt)
- Cooling system: approx. 7-8 L (7.4-8.4 qt)
- Transmission fluid: approx. 6-7 L (6.3-7.4 qt)
- Drive axle oil: approx. 4-5 L (4.2-5.3 qt)
- Hydraulic oil: approx. 22-26 L (23-27 qt)
Mast Types:
- Duplex (2-stage) mast for standard-height operations
- Triplex (3-stage full free-lift) mast for operations requiring high lift
within low-overhead environments
Lift Height Ranges:
- Duplex mast: approx. 3.0-3.7 m (118-146 in)
- Triplex mast: approx. 4.3-5.5 m (169-216 in)
Free Lift:
- approx. 0.15-0.40 m (6-16 in)
Fork Specifications:
- Standard lengths: 1,067-1,219 mm (42-48 in)
- Optional lengths: 1,524 mm (60 in) and longer
- Fork width: approx. 100 mm (4 in)
- Fork thickness: approx. 40-45 mm (1.6-1.8 in)
Rated lifting capacity: 2,500 kg (5,500 lb) at 600 mm
(24 in) load center
De-rating occurs with increased lift height, fork extensions, specialized
attachments, off-center loading, poor load geometry, or incline operation.
- Lift speed (unladen): approx. 0.45-0.55 m/s (90-110
ft/min)
- Lift speed (laden): approx. 0.30-0.40 m/s (60-80 ft/min)
- Lowering speed (unladen): approx. 110-140 ft/min
- Lowering speed (laden): approx. 130-160 ft/min)
- Travel speed (unladen): approx. 16-18 km/h (10-11 mph)
- Travel speed (laden): approx. 14-16 km/h (9-10 mph)
- Gradeability (unladen): approx. 18-24%
- Gradeability (laden): approx. 14-18%
- Drawbar pull: approx. 12,000-16,000 N (2,698-3,597 lbf)
- Overall length to fork face: approx. 2.4-2.6 m
(94-102 in)
- Overall width: approx. 1.1-1.2 m (43-47 in)
- Overhead guard height: approx. 2.1-2.2 m (83-87 in)
- Wheelbase: approx. 1.45-1.55 m (57-61 in)
- Ground clearance: approx. 130-150 mm (5.1-5.9 in)
- Turning radius: approx. 2.1-2.4 m (83-95 in)
- Aisle width (1000x1200 mm pallet): approx. 3.6-3.9 m (142-154 in)
- Maximum fork height: 3.0-5.5 m depending on mast type
- Free lift: approx. 0.15-0.40 m
- Fork lengths: 42-60 in
- Operating weight: approx. 3,900-4,400 kg (8,598-9,700 lb)
250-Hour
Maintenance:
- Replace engine oil and oil filter
- Clean radiator and check coolant level
- Lubricate mast channels, rollers, and tilt pin bores
- Inspect air filter element
- Test battery capacity and cable integrity
500-Hour Maintenance:
- Replace transmission oil filter
- Inspect hydraulic return filter
- Examine driveline couplings
- Inspect axle seals and hub bearings
1,000-Hour Maintenance:
- Replace transmission oil
- Replace drive axle lubricant
- Inspect mast chain stretch and carriage alignment
- Examine lift and tilt cylinder seals
2,000-Hour Maintenance:
- Replace hydraulic oil
- Replace coolant
- Inspect mast structure, pivot pins, welds, and attachment interface
- Test operational safety systems and interlocks
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