Clark C20SD Specifications
The Clark C20SD is a diesel-powered, counterbalanced
forklift truck produced from approximately 2008 through 2025. This rider-seated
model is engineered for demanding indoor and outdoor material handling tasks
requiring a rated load capacity of 2000 kg. The machine is powered by the Yanmar
4TNV88 engine, a four-cylinder diesel unit with a displacement of 2.19 liters.
The C20SD features Clark's own TA12 single speed, full reversing, powershift
transaxle with high stall ratio industrial torque converter, full-floating drive
axles, and drum and shoe brakes.
The hydraulic system includes a full-flow reverse filter that filters the oil to
the tank at each reverse flow, with rough particles filtered directly via a
suction filter to prevent them from entering the oil circuit and ensure a long
service life for all hydraulic components. The clear-view uprights are available
in Standard, Hilo, and Triplex versions, featuring heavy-duty interlocked narrow
profiles that provide high strength even under the heaviest load. Adjustable
sealed canted (angled) rollers minimize deflection particularly when handling
off-set loads, and the tilt cylinders are mounted in spherical bearings.
The Clark C20SD is a four-wheeled forklift with a load capacity of 2000 kg or
4409 lb at a 500 mm or 20 in load centre. The nominal load at the center of
gravity is 2 tons. Its design prioritises stability and manoeuvrability in
demanding environments. The machine is fitted with pneumatic tyres as standard,
suitable for indoor and outdoor use on improved surfaces. The transmission type
is Powershift with one forward and one reverse gear, designated as type W. The
service weight of the machine is 3168 kg or 6984 lb.
Weight distribution with full load places 4459 kg or 9830 lb on the front axle
and 709 kg or 1563 lb on the rear axle. Without load, weight distribution shifts
to 1179 kg or 2599 lb on the front axle and 1989 kg or 4385 lb on the rear axle.
The body and frame are constructed from fully welded heavy gauge steel, and the
machine features a CLARK own TA12 single speed, full reversing, powershift
transaxle with high stall ratio industrial torque converter and full-floating
drive axles.
Basic Technical Data: The forklift is powered by the
Yanmar 4TNV88 engine, a four-cylinder diesel unit. With a displacement of 2190
cc or 134 cu.in, this engine produces 28.8 kW or 38.6 hp of power at a rated
speed of 2400 rpm. The engine delivers peak torque of 106 lb-ft or 144 Nm at
1440 rpm. The engine features dual overhead cam design, and the timing is
chain-driven. The engine is compatible with Tier 2 emission standards. The
cylinder bore and stroke dimensions are 88 mm x 90 mm .
Lubrication: The engine lubrication system is a forced-feed type, employing a
gear pump to circulate oil throughout the engine block and cylinder head,
ensuring all moving components are adequately lubricated for reduced friction
and prolonged engine life. The system includes a full-flow oil filter to remove
contaminants. The hydraulic system features a full-flow reverse filter that
filters the oil to the tank at each reverse flow, with rough particles filtered
directly via a suction filter, preventing them from entering the oil circuit and
ensuring a long service life for all hydraulic components.
Cooling: Engine temperature is regulated by a liquid cooling system. This system
comprises a radiator, a water pump, a thermostat, and a cooling fan. The water
pump circulates coolant through the engine jackets to absorb heat, which is then
dissipated as it passes through the radiator core. The engine features proven
cooling systems for reliable operation.
Transmission: The Clark C20SD is equipped with a CLARK
own TA12 single speed, full reversing, Powershift transaxle with high stall
ratio industrial torque converter. The transmission features one forward and one
reverse gear, designated as type W. This transmission allows for smooth
direction changes without the need for a clutch pedal, reducing operator fatigue
during frequent shuttling. The full-floating drive axles ensure durability and
reliable power transmission.
Travel Speed: The forklift achieves a laden travel speed of 17.4 km/h or 10.8
mph and an unladen speed of 17.9 km/h or 11.2 mph.
Axles: The front axle is a rigid, full-floating drive axle that carries the
majority of the load, while the rear axle is a steer axle. The rear axle is
designed to oscillate, allowing all wheels to maintain ground contact on uneven
surfaces, which is crucial for stability. The wheelbase measures 1400 mm or 55.1
in. The tread width is 890 mm or 35 in for both the front and rear axles.
Brakes: The service brake system is drum and shoe type, providing reliable and
controlled stopping power. This system uses hydraulic pressure to apply the
brakes, offering a consistent pedal feel and effective deceleration. The service
brake is foot/hydraulic operated. The parking brake is foot pedal operated.
The electrical system operates on a 12 V architecture.
It includes a maintenance-free battery to power the starter motor, electronic
controls, and lighting. The system encompasses a starter, an alternator to
charge the battery while the engine runs, and a comprehensive wiring harness
connecting all electrical components. The sound level is 81 dBA.
Wheel Drive: The Clark C20SD features a 2-wheel drive
configuration, with the front wheels providing the tractive effort (2x driven
wheels).
Wheels: The forklift uses a 2x/2 wheel configuration, meaning two wheels on the
front axle and two on the rear. The front wheels are the driven wheels. The
machine features a fully welded heavy gauge frame for enhanced durability.
Tires: This model is fitted with pneumatic tyres as standard. The tyre size for
the front is 6.50x10-12PR , and for the rear, it is 5.00x8-10PR. Standard tyres
are designated as L (SE) type. These tyres provide traction and cushioning for
indoor and outdoor applications.
The steering system is hydrostatic power
steering, making manoeuvring the truck effortless for the operator. The
steering system includes a priority distributor that ensures steering
priority in all conditions, with load handling controlled via a load
sensitive-response and precise control valve. A safety valve provides
extra safety and prevents an uncontrolled lowering of the load at all
times.
The hydraulic system is designed for efficient lifting
and tilting operations with clear-view uprights, heavy-duty interlocked narrow
profiles, adjustable sealed canted (angled) rollers, and tilt cylinders mounted
in spherical bearings. It operates at a maximum operating pressure for
attachments of 140 bar or 2030 psi. The system pump delivers a rated flow of up
to 35 L/min or 9.2 gpm for attachments. A high-capacity pump provides adequate
oil supply for the upright and the hydrostatic steering. A priority distributor
ensures steering priority in all conditions.
Load handling is controlled via a load sensitive-response and precise control
valve, with a safety valve that provides extra safety and prevents an
uncontrolled lowering of the load at all times. The hydraulic system includes a
full-flow reverse filter that filters the oil to the tank at each reverse flow,
with rough particles filtered directly via a suction filter, preventing them
from entering the oil circuit and ensuring a long service life for all hydraulic
components. Auxiliary hydraulic functions support additional attachments.
The Clark C20SD can be equipped with various mast types
including Standard, Hilo and Triplex versions with clear-view design. The
heavy-duty interlocked narrow profiles provide high strength even under the
heaviest load, with adjustable sealed canted (angled) rollers that minimize
deflection particularly when handling off-set loads. The tilt cylinders are
mounted in spherical bearings for smooth operation and durability.
Specifications for a standard mast include a lowered height of 2240 mm or 88.2
in. The mast has a free lift of 110 mm or 4.3 in, allowing the forks to be
raised to this height without increasing the mast's overall height.
The standard lift height is 3285 mm or 129.3 in. Alternative Triplex mast
configurations offer maximum lift heights up to 4780 mm or 188 in. At full lift,
the upright extends to a height of 4507 mm or 177.4 in with load backrest. The
fork carriage is CLASS IIA according to DIN 15173. The fork carriage width is
940 mm or 37 in. The load distance from the centreline of the front axle to the
front face of forks is 397 mm or 15.6 in. The mast and fork carriage can tilt
forward by 8 degrees and backward by 8 degrees to facilitate load handling and
secure transport.
Load Capacity - 4,400 lb (2,000 kg)
Load Centre - 20 in (500 mm)
The lift speed with a load is 0.54 m/s or 106 fpm, and
without a load, it is 0.61 m/s or 120 fpm. The lowering speed with a load is
0.47 m/s or 92.5 fpm, and without a load, it is 0.43 m/s or 84.6 fpm. The
maximum drawbar pull, or the pulling force, is 15088 N or 3392 lbf when laden
and 6916 N or 1555 lbf when unladen. Its gradeability, the ability to ascend a
slope with a load, is 31.1%.
The overall length of the truck, including the forks,
is 3358 mm or 132.2 in, while the length to the face of the forks is 2288 mm or
90.1 in. The overall width is 1070 mm or 42.1 in. The height of the overhead
guard is 2120 mm or 83.5 in. The seat height is 1100 mm or 43.3 in, and the
coupling height is 310 mm or 12.2 in. The standard fork dimensions are 40 mm or
1.57 in thick, 100 mm or 3.94 in wide, and 1070 mm or 42.1 in long. Alternative
fork lengths of 48 in and 1200 mm are available depending on configuration. The
maximum fork spread is 1040 mm or 41 in.
Ground clearance minimum with load is 120 mm or 4.72 in. Ground clearance at the
centre of wheelbase is 124 mm or 4.88 in. The aisle width required for pallets
sized 1000 by 1200 mm crossways is 3751 mm or 147.7 in, and for pallets sized
800 by 1200 mm lengthways, it is 3951 mm or 155.6 in. The outer turning radius
is 2154 mm or 84.8 in. The internal turning radius is 571 mm or 22.5 in. The
service weight (empty) is 3168 kg or 6984 lb.
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