Clark GCX50 Specifications
The Clark GCX50 is a heavy-duty pneumatic-tire
internal-combustion forklift engineered for intense industrial operations
requiring reliable high-capacity lifting and predictable handling. With a
nominal lifting capacity of 5,000 kg (11,000 lb), the GCX50 belongs to Clark’s
rugged GCX pneumatic series and is widely used in steel and lumber yards,
concrete and masonry supply facilities, freight terminals, outdoor storage
depots, ports, and large manufacturing plants.
Its pneumatic tire configuration enables shock
absorption and surface adaptability on uneven or partially unpaved
ground, improving operator comfort and maintaining load stability in
demanding work zones.
The GCX50 employs a reinforced steel chassis, a high-visibility mast
structure with thick-section channels, and a heavy-duty driveline
engineered to withstand sustained load cycles.
Its operator station emphasizes ergonomic
control positioning, strong visibility lines, and reduced vibration
transmission. Technicians benefit from wide-access service panels,
simplified hydraulic routing, and robust drivetrain components that
deliver long-term service durability.
The Clark GCX50 is equipped with one of two
well-established Perkins industrial engines: the Perkins 1004.4 diesel
(approximately 4.0 L displacement) or the Perkins G4.236 gasoline (approximately
3.9 L displacement). Both engines are renowned for strong low-RPM torque,
mechanical reliability, high thermal efficiency, and suitability for continuous
heavy-duty material-handling operations.
Perkins 1004.4 - 4.0 L diesel
- Configuration: inline 4-cylinder, 4-stroke direct-injection diesel
- Displacement: approx. 3,990 cc (4.0 L)
- Bore/stroke: approx. 100 mm x127 mm (3.94x5.00 in)
- Rated power: approx. 63-70 kW (85-94 hp)
- Peak torque: approx. 240-280 lb-ft (325-380 Nm)
- Rated speed: approx. 2,200-2,400 rpm
- Idle speed: approx. 700-800 rpm
- Fuel: diesel
Perkins G4.236 - 3.9 L gasoline/LPG
- Displacement: approx. 3,860 cc (3.9 L)
- Bore/stroke: approx. 98 mm x127 mm (3.86x5.00 in)
- Rated power: approx. 55-63 kW (74-85 hp)
- Peak torque: approx. 220-260 lb-ft (298-353 Nm)
- Rated speed: approx. 2,200-2,400 rpm
- Idle: approx. 700-800 rpm
Lubrication System
- Full-pressure wet-sump lubrication
- Gear-driven lubricating pump
- Oil capacity: approx. 7-9 L (7.4-9.5 qt)
- Oil pressure: approx. 250-450 kPa (36-65 psi)
- Recommended oil: SAE 15W-40 (API CF or higher)
- Full-flow spin-on filter
Cooling System
- Liquid cooling with centrifugal water pump
- Multi-row industrial radiator
- Coolant capacity: approx. 12-14 L (12.7-14.8 qt)
- Thermostat: approx. 82°C (180°F) opening start
- System pressure: approx. 70-90 kPa (10-13 psi)
The GCX50 uses a heavy-duty torque-converter powershift
transmission engineered for high-torque load handling and repeat direction
changes.
Transmission
- Type: torque-converter powershift
- Forward and reverse speeds; single or two-speed depending on model
- Forward speed (unladen): approx. 18-20 km/h (11-12 mph)
- Reverse speed: approx. 16-18 km/h (10-11 mph)
- Fluid capacity: approx. 10-12 L (10.5-12.7 qt)
- Fluid type: Dexron III or Clark-approved ATF
- Integrated transmission oil cooler
Drive Axle
- Cast-steel differential housing
- Planetary reduction hubs
- Industrial bevel-gear differential
- Lubricant capacity: approx. 7-9 L (7.4-9.5 qt)
- Recommended lubricant: SAE 80W-90 or 85W-140
Brakes
- Oil-immersed wet-disc service brakes
- Long-life friction surfaces
- Parking brake: mechanical hand-lever
- Wet-disc design resists contamination and overheating
- Voltage: 12 V
- Battery capacity: approx. 90-110 Ah
- Alternator: approx. 60-90 A output
- Starter: approx. 2.5-3.5 kW
- Industrial wiring harness with abrasion shielding
- Safety interlocks: operator presence, neutral start
- Lighting: headlights, taillights, backup lamps; optional overhead lamps and
beacon
Drive System:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2WD pneumatic-tire configuration
- Front tires: approx. 300-15 or 28x12-15 pneumatic
- Rear tires: approx. 7.00-12 pneumatic
Options:
- Solid pneumatic tires
- Outdoor traction treads
- Non-marking tires
Chassis features:
- Fully welded heavy-gauge steel frame
- Reinforced mast base
- Protected hydraulic and electrical routing
- Low center of gravity design
Steering:
- Steering type: hydrostatic steering
- Pump flow: approx. 10-15 L/min (2.6-4.0 gpm)
- Oscillating rear steer axle with heavy-duty bearings
- Turning radius: approx. 2.8-3.1 m (110-122 in)
- Steering characteristics: smooth and precise
- Maximum pressure: approx. 2,300-2,500 psi (159-172
bar)
- Engine-driven external gear pump
- Pump flow: approx. 50-70 L/min (13-18 gpm)
- Reservoir capacity: approx. 40-50 L (42-53 qt)
- Hydraulic fluid: ISO VG 32 or 46
- Lift cylinders: double-acting
- Tilt cylinders: dual opposing cylinders
- Auxiliary hydraulics: sideshifters, rotators, clamps, fork-positioners
| Service Refill Capacities |
- Engine oil: approx. 7-9 L (7.4-9.5 qt)
- Cooling system: approx. 12-14 L (12.7-14.8 qt)
- Transmission: approx. 10-12 L (10.5-12.7 qt)
- Drive axle: approx. 7-9 L (7.4-9.5 qt)
- Hydraulic reservoir: approx. 40-50 L (42-53 qt)
- Duplex and Triplex mast designs
- Duplex lift height: approx. 3.0-4.0 m (118-157 in)
- Triplex lift height: approx. 4.5-6.0 m (177-236 in)
- Free lift: approx. 1.0-1.4 m (39-55 in)
- Fork lengths: 1,067-1,219 mm (42-48 in) standard; up to 1,829 mm (72 in)
optional
- Fork width: approx. 125-150 mm (5-6 in)
- Fork thickness: approx. 45-60 mm (1.75-2.4 in)
Rated lifting capacity: 5,000 kg (11,000 lb) at 600 mm
(24 in) load center
Capacity reduced by increased lift height, attachments, fork extensions, uneven
ground, and off-center loading
- Lift speed (unladen): approx. 0.45-0.55 m/s
- Lift speed (laden): approx. 0.30-0.40 m/s
- Lowering speed (unladen): approx. 110-140 ft/min
- Lowering speed (laden): approx. 130-160 ft/min
- Travel speed (unladen): approx. 18-20 km/h
- Travel speed (laden): approx. 15-17 km/h
- Gradeability (unladen): approx. 25-30%
- Gradeability (laden): approx. 15-20%
- Drawbar pull: approx. 20,000-30,000 N
- Overall length to fork face: approx. 3.0-3.2 m
(118-126 in)
- Overall width: approx. 1.45-1.55 m (57-61 in)
- Overhead guard height: approx. 2.3-2.4 m (90-95 in)
- Wheelbase: approx. 1.9-2.0 m (75-79 in)
- Ground clearance: approx. 150-200 mm (5.9-7.9 in)
- Turning radius: approx. 2.8-3.1 m (110-122 in)
- Aisle width (1000x1200 pallet): approx. 4.6-5.0 m (181-197 in)
- Maximum fork height: 3.0-6.0 m
- Free lift: approx. 1.0-1.4 m
- Fork lengths: 42-72 in
- Operating weight: approx. 7,000-8,500 kg (15,432-18,739 lb)
250-Hour:
- Replace engine oil and filter
- Clean radiator
- Lubricate mast channels and pivot points
- Check battery
500-Hour:
- Replace transmission filter
- Inspect hydraulic filter
- Check driveline components
1,000-Hour:
- Replace transmission oil
- Replace axle lubricant
- Inspect tilt and lift cylinders
2,000-Hour:
- Replace hydraulic oil
- Replace coolant
- Complete mast structural inspection
- Test safety systems
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