Clark C20B Specifications
The Clark C20B is a compact, cushion-tire,
internal-combustion forklift designed for indoor industrial environments
requiring strong maneuverability, smooth handling, and dependable mid-capacity
lifting performance.
With a nominal lifting capacity of
approximately 2,000 kg (4,400 pounds), the Clark C20B is widely used in
warehouses, manufacturing plants, fabrication facilities, retail
distribution centers, packaging operations, beverage facilities, and
general indoor material-handling sectors where tight aisle navigation
and precise load control are essential.
Built with Clark’s characteristic heavy-steel frame, reinforced mast
structure, and durable internal-combustion powertrain, the C20B delivers
consistent performance across multiple shifts. Operators benefit from a
well-designed cab layout with clear mast visibility, ergonomic controls,
low step-in height, and smooth hydrostatic steering. Cushion tires offer
improved turning capability and reduced vibration on polished or
concrete industrial floors, making the C20B ideal for tight aisle
environments.
Maintenance personnel value the logical
mechanical layout, open engine access, organized hydraulic routing, and
durable components designed for long-term service life. The forklift’s
strong combination of comfort, handling precision, stability, and
reliability makes it well suited for general warehouse applications
requiring dependable daily operation.
The Clark C20B is commonly equipped with a
fuel-efficient industrial engine such as the Mazda M4G-type LPG engine, Mazda
M4-series gasoline engine, or similar Clark-spec industrial internal-combustion
power units depending on production year and region. These engines emphasize
quiet operation, long life, low vibration, and efficient torque curves suitable
for indoor lifting cycles.
Engine Characteristics (Mazda M4G LPG
Engine):
- Engine type: inline 4-cylinder, 4-stroke gasoline/LPG industrial engine
- Displacement: approx. 2.0-2.2 liters
- Power output: approx. 35-45 kW (47-60 hp)
- Peak torque: approx. 110-150 Nm (81-111 lb-ft)
- Fuel system: vapor-withdrawal LPG system with regulator, mixer, and
carburetion
- Idle speed: approx. 650-750 rpm
- Rated speed: approx. 2,400-2,600 rpm
Engine Characteristics (Gasoline Variant):
- Power range: approx. 40-55 kW (54-74 hp)
- Torque range: approx. 120-165 Nm (89-122 lb-ft)
- Induction: naturally aspirated
- Emissions: designed for indoor-use compliance with appropriate maintenance
Engine Construction:
- Cast-iron cylinder block for durability
- Cast-iron or aluminum cylinder head depending on version
- Forged crankshaft supported by multiple main bearings
- High-strength connecting rods
- Aluminum pistons with heat-resistant crowns
Fuel System:
- LPG system with regulator/vaporizer and fuel mixer or gasoline carburetor
- Multi-stage fuel filtration with water separation
- Designed for clean operation and low emissions indoors
Lubrication System:
- Full-pressure wet-sump lubrication
- Crankshaft-driven gear-type oil pump
- Oil capacity: approx. 3.5-5.0 L (3.7-5.3 qt)
- Normal oil pressure: approx. 250-400 kPa (36-58 psi)
- Oil type: SAE 10W-30 or 15W-40
- Replaceable spin-on full-flow oil filter
Cooling System:
- Liquid-cooled system with belt-driven centrifugal water pump
- Coolant capacity: approx. 6-8 L (6.3-8.4 qt)
- Radiator: industrial fin-type core optimized for indoor airflow
- Thermostat: opens at approx. 82°C (180°F)
- Cooling system pressure: approx. 13 psi (90 kPa)
The Clark C20B uses a compact industrial powershift
transmission engineered for smooth directional changes in warehouse
environments.
Transmission:
- Type: torque-converter powershift
- Gears: forward, reverse, neutral
- Forward travel speed (unladen): approx. 15-17 km/h (9-10.5 mph)
- Reverse travel speed: approx. 13-15 km/h (8-9.5 mph)
- Transmission fluid capacity: approx. 5-7 L (5.3-7.4 qt)
- Recommended fluid: ATF Dexron III or Clark-approved industrial ATF
- Direction control: steering-column mounted lever operating hydraulic clutch
packs
Drive Axle:
- Construction: cast-steel differential housing
- Final drive: planetary hub reduction for increased torque
- Axle lube capacity: approx. 3-4 L (3.2-4.2 qt)
- Lubricant: SAE 80W-90 gear oil
Braking System:
- Service brakes: hydraulic drum brakes (common in compact indoor forklifts)
- Optional service brakes: oil-immersed wet disc, depending on production year
- Parking brake: mechanical lever-actuated drum brake
- Braking behavior optimized for smooth indoor deceleration
- System voltage: 12 V
- Battery capacity: approx. 55-75 Ah
- Alternator output: approx. 35-60 A
- Starter motor: approx. 1.2-1.8 kW
- Safety interlocks: neutral-start switch, operator presence system
- Lighting: headlights, rear lamps, optional overhead work lights
- Electrical harness: heat-resistant insulated wiring designed for indoor duty
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive system: 2-wheel drive (cushion-tire configuration optimized for indoor
floors)
Tire Specifications (Cushion Tires):
- Front tires: approx. 21x7x15
- Rear tires: approx. 16x5x10.5
Optional Tires:
- Non-marking cushion tires for food-grade or clean-room environments
- Heat-resistant compounds for high-temperature indoor applications
Chassis Construction:
- Fully welded steel frame with reinforced mast supports
- Low center of gravity suitable for stable indoor travel
- Counterweight integrated into the rear frame for correct load balance
- Hydraulic, electrical, and fuel lines routed for protection beneath shielding
plates
Steering:
- Steering type: fully hydrostatic power steering
- Steering pump flow: approx. 6-10 L/min (1.6-2.6 gpm)
- Steering axle: oscillating rear axle with center pivot bushings
- Turning radius: approx. 1.7-1.9 m (67-75 in)
- Steering characteristics: extremely responsive for narrow-aisle maneuvering
- Maximum hydraulic pressure: approx. 2,000-2,200 psi
(138-152 bar)
- Pump type: engine-driven external gear pump
- Pump flow: approx. 25-35 L/min (6.6-9.2 gpm)
- Hydraulic reservoir: approx. 20-25 L (21-26 qt)
- Fluid grade: ISO VG 32 or ISO VG 46
- Lift cylinders: double-acting cylinders with integrated cushioning
- Tilt cylinders: dual tilt cylinders offering smooth mast movement
- Optional auxiliary circuits: sideshift, fork positioner, clamp attachments
| Service Refill Capacities |
- Engine oil: 3.5-5.0 L (3.7-5.3 qt)
- Cooling system: 6-8 L (6.3-8.4 qt)
- Transmission fluid: 5-7 L (5.3-7.4 qt)
- Drive axle oil: 3-4 L (3.2-4.2 qt)
- Hydraulic oil: 20-25 L (21-26 qt)
Mast Types:
- Two-stage (V mast duplex)
- Three-stage (FV mast triplex full free-lift)
Lift Heights:
- V mast: approx. 2.5-3.5 m (98-138 in)
- FV mast: approx. 4.0-5.5 m (157-216 in)
Free Lift:
- Approx. 0.1-0.8 m (4-31 in) depending on mast configuration
Fork Specifications:
- Standard fork length: 914-1,067 mm (36-42 in)
- Optional fork lengths: 1,067-1,219 mm (42-48 in)
- Fork width: approx. 100-125 mm (4-5 in)
- Fork thickness: approx. 35-45 mm (1.4-1.8 in)
- Rated load: approx. 2,000 kg (4,400 lb) at 600 mm (24
in) load center
Load de-rating occurs under:
- increased lift height
- long forks or fork extensions
- heavy side-shift or clamp attachments
- off-center loads
- incline or uneven flooring
- Lift speed (unladen): approx. 0.40-0.50 m/s (80-100
ft/min)
- Lift speed (laden): approx. 0.25-0.30 m/s (50-60 ft/min)
- Lowering speed (unladen): approx. 90-120 ft/min
- Lowering speed (laden): approx. 110-140 ft/min
- Travel speed (unladen): approx. 15-17 km/h (9-10.5 mph)
- Travel speed (laden): approx. 12-14 km/h (7-9 mph)
- Gradeability (unladen): approx. 18-22%
- Gradeability (laden): approx. 10-14%
- Drawbar pull: approx. 10,000-15,000 N (2,248-3,370 lbf)
- Overall length to fork face: approx. 2.1-2.3 m (83-91
in)
- Overall width: approx. 1.0-1.1 m (39-43 in)
- Overhead guard height: approx. 2.0-2.1 m (79-83 in)
- Wheelbase: approx. 1.4-1.5 m (55-59 in)
- Ground clearance: approx. 80-100 mm (3.1-4.0 in)
- Turning radius: approx. 1.7-1.9 m (67-75 in)
- Aisle width (1000x1200 pallet): approx. 3.0-3.3 m (118-130 in)
- Maximum fork height: approx. 2.5-5.5 m depending on mast
- Free lift: 0.1-0.8 m
- Fork options: 36-48 in
- Operating weight: approx. 3,200-3,700 kg (7,055-8,157 lb)
- Counterweight mass: approx. 700-1,000 kg (1,543-2,205 lb)
250-Hour
Maintenance:
- Change engine oil and replace filter
- Lubricate mast channels and steering joints
- Clean or replace air cleaner
- Clean radiator fins
- Check battery terminals
500-Hour Maintenance:
- Replace fuel filter
- Inspect driveline and propeller shaft
- Check brake shoes and drums
- Inspect axle seals and hubs
1,000-Hour Maintenance:
- Replace transmission oil
- Replace drive axle oil
- Inspect hydraulic cylinders for wear or leakage
- Check chain stretch and mast alignment
2,000-Hour Maintenance:
- Replace hydraulic oil
- Replace coolant
- Full mast inspection
- Test operator-presence and neutral-start circuits
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