Clark GPX20 Specifications
The Clark GPX20 is a compact pneumatic-tire
internal-combustion forklift engineered for versatile outdoor and indoor
material-handling operations requiring maneuverability, stable load control, and
long-term reliability under demanding multi-shift conditions.
With a nominal rated lift capacity of 2,000 kg
(4,400 lb) at a 610 mm (24 in) load center, the GPX20 occupies the lower
mid-capacity class of pneumatic-tire Clark forklifts, optimized for
industrial yards, dock operations, agricultural facilities, construction
supply areas, and general commercial sites where both traction and
comfort are needed on mixed surfaces. The pneumatic-tire configuration
provides improved shock absorption, enhanced operator comfort, and
better performance on gravel, asphalt, and uneven surfaces compared to
cushion-tire models.
The GPX20 is offered with two industrial engine options: the Mitsubishi
2.6-liter LPG/Gasoline engine and the Continental TM27 2.7-liter
LPG/Gasoline engine. Both powerplants deliver smooth torque output, low
vibration, and reliable fuel performance across the typical operating
ranges of material-handling tasks. The GPX20 incorporates a heavy-duty
powershift transmission, cast-steel drive axle, hydrostatic steering
system, and a high-visibility mast structure designed for precise load
manipulation and long service intervals.
Reinforced frame construction, protected
hydraulic routing, and operator-friendly controls contribute to
dependable daily operation. Full-floating powertrain mounts minimize
vibration transmitted to the operator compartment. The unit is built for
ease of service with tool-accessible filter locations, simplified
cooling components, and durable industrial fasteners.
The Clark GPX20 is equipped with either the Mitsubishi
2.6-liter or Continental TM27 2.7-liter industrial engines. Both engines are
designed for LPG or gasoline operation, supporting emissions-compliant
industrial applications. They feature cast-iron architecture for long service
life, conservative RPM limits, industrial-grade piston rings, heavy-duty
bearings, and torque characteristics optimized for low-speed power delivery.
Engine Characteristics (Mitsubishi 2.6L
Industrial):
- Engine type: 4-cylinder, 4-stroke, overhead-valve
- Displacement: approx. 2.6 L
- Rated output: approx. 40-50 kW (54-67 hp)
- Peak torque: approx. 120-140 lb-ft (163-190 Nm)
- Idle speed: approx. 750-850 rpm
- Governed maximum: approx. 2,500-2,700 rpm
- Fuel type: LPG or gasoline
- Fuel system: mixer-type carburetor or electronically controlled LPG metering
- Construction: cast-iron block with aluminum cylinder head
Engine Characteristics (Continental TM27
2.7L Industrial):
- Displacement: approx. 2.7 L
- Rated output: approx. 45-55 kW (60-74 hp)
- Peak torque: approx. 135-155 lb-ft (183-210 Nm)
- Idle speed: approx. 750-850 rpm
- Governed maximum: approx. 2,600-2,800 rpm
- Fuel configuration: LPG or gasoline industrial mixer system
- Construction: cast-iron block and head
Lubrication System:
- Lubrication type: full-pressure wet-sump
- Oil capacity (Mitsubishi): approx. 4.0-4.5 L (4.2-4.7 qt)
- Oil capacity (Continental): approx. 4.0-4.8 L (4.2-5.1 qt)
- Recommended oil viscosity: SAE 10W-30 or 15W-40 depending on temperature
- Typical oil pressure: approx. 25-50 psi (172-345 kPa)
- Filtration: full-flow spin-on filter
- Lubricated components: main bearings, connecting rods, valvetrain, camshaft
journals, auxiliary drive components
Cooling System:
- Cooling type: liquid cooling with thermostat
- Coolant capacity: approx. 6-7 L (6.3-7.4 qt)
- Thermostat opening temperature: approx. 82°C (180°F)
- Cooling system pressure: approx. 13-15 psi (90-103 kPa)
- Water pump: belt-driven centrifugal
- Radiator: industrial multi-row cross-flow design
- Cooling fan: engine-driven mechanical fan
The GPX20 utilizes a compact industrial powershift
transmission engineered for repetitive directional changes, frequent
acceleration cycles, and continuous lifting operations typical in warehouse and
yard applications. A torque converter provides smooth launch characteristics and
moderates driveline shock.
Transmission:
- Transmission type: single-speed or two-speed powershift
- 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: ATF Dexron III or equivalent
- Directional control: mechanical or electro-hydraulic lever depending on model
year
Drive Axle:
- Axle design: cast-steel differential axle with planetary reduction hubs
- Differential: bevel-gear industrial differential
- Axle lubricant capacity: approx. 4-5 L (4.2-5.3 qt)
- Lubricant: SAE 80W-90 or 85W-140 depending on climate
Braking System:
- Service brakes: hydraulic wet-disc, oil-immersed
- Parking brake: mechanical hand lever
- Operational behavior: fade-resistant braking, sealed components, minimal
maintenance requirements
- System voltage: 12 V
- Battery capacity: approx. 70-90 Ah
- Alternator output: approx. 50-70 A
- Starter motor: approx. 1.7-2.2 kW
- Safety circuits: neutral-start lockout, seat switch, LPG lock-off solenoid
- Lighting: front working lamps standard; optional rear lamps or strobe beacon
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2-wheel drive (2WD)
Tire Specifications (Pneumatic):
- Front tires: approx. 21x8-9
- Rear tires: approx. 16x6-8
Optional Tires:
- Solid pneumatic for high-debris areas
- Non-marking industrial tires for clean indoor environments
Chassis Features:
- Welded heavy-gauge steel frame
- Reinforced counterweight section for balanced load handling
- Protected hydraulic and electrical routing within the chassis
- Full-floating powertrain mounts reduce vibration
Steering:
- Steering type: hydrostatic power steering
- Steering pump flow: approx. 10-12 L/min (2.6-3.2 gpm)
- Steering axle: center-pivot oscillating design allowing articulation
- Turning radius: approx. 2.0-2.2 m (79-87 in)
- Steering characteristics: low-effort, precise, optimized for narrow-aisle
maneuvering
- Maximum hydraulic pressure: approx. 2,300-2,500 psi
(159-172 bar)
- Hydraulic pump: engine-driven gear pump
- Pump flow: approx. 35-50 L/min (9-13 gpm)
- Hydraulic reservoir: approx. 20-25 L (21-26 qt)
- Hydraulic fluid: ISO VG 32 or ISO VG 46 depending on climate
- Lift cylinders: double-acting, heavy-duty cylinders
- Tilt cylinders: dual cylinders with pressure-relief provisions
| Service Refill Capacities |
- Engine oil: 4.0-4.8 L (4.2-5.1 qt)
- Cooling system: 6-7 L (6.3-7.4 qt)
- Transmission fluid: 6-7 L (6.3-7.4 qt)
- Drive axle oil: 4-5 L (4.2-5.3 qt)
- Hydraulic oil: 20-25 L (21-26 qt)
Mast Types:
- Duplex (2-stage)
- Triplex (3-stage full-free-lift)
Mast Heights:
- Duplex: approx. 3.0-3.7 m (118-146 in)
- Triplex: approx. 4.3-5.5 m (169-216 in)
Free-Lift:
- approx. 0.15-0.40 m (6-16 in) depending on mast
Fork Specifications:
- Standard fork length: 1,067 mm (42 in)
- Optional lengths: 1,219-1,524 mm (48-60 in)
- Fork thickness: approx. 40 mm (1.6 in)
- Fork width: approx. 100 mm (4 in)
Rated Capacity: 2,000 kg (4,400 lb) at a 610 mm (24 in)
load center
De-rating occurs due to:
- Increased lift height
- Use of attachments
- Fork extensions
- Offset loading
- Unstable or uneven load distribution
- 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. 130-150 ft/min
- Gradeability (unladen): approx. 20-25%
- Gradeability (laden): approx. 15-18%
- Drawbar pull: approx. 10,000-14,000 N (2,248-3,147 lbf)
- Overall length to fork face: approx. 2.3-2.4 m (90-94
in)
- Overall width: approx. 1.05-1.10 m (41-43 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. 100-120 mm (4-5 in)
- Turning radius: approx. 2.0-2.2 m (79-87 in)
- Aisle width (pallet 1000x1200): approx. 3.4-3.6 m (134-142 in)
- Maximum fork height: 3.0-5.5 m depending on mast
- Free lift: approx. 0.15-0.40 m
- Fork lengths: 42-60 in
- Operating weight: approx. 3,400-3,900 kg (7,495-8,598 lb)
250-Hour
Maintenance:
- Replace engine oil and filter
- Inspect and clean air filter
- Lubricate steer axle and mast carriage rollers
- Clean radiator and check coolant concentration
500-Hour Maintenance:
- Replace transmission filter
- Inspect hydraulic filter
- Check driveline couplings and axle seals
1,000-Hour Maintenance:
- Replace transmission fluid
- Replace axle oil
- Inspect hydraulic cylinders and hose assemblies
2,000-Hour Maintenance:
- Replace hydraulic oil
- Replace coolant
- Perform complete mast inspection including chain replacement if worn
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