Clark C20SL Specifications
The Clark C20SL is a 2.0-tonne (4,409 lb) capacity,
LPG-powered, seated rider forklift, engineered for reliable performance in
medium-duty indoor and outdoor material handling applications. As a core model
in Clark's pneumatic tire line, this forklift is designed for versatility in
warehouses, distribution centers, lumber yards, and manufacturing facilities.
Powered by the efficient HMC Theta 2.4 L LPG
engine, it delivers responsive power while maintaining fuel efficiency.
Its durable construction, clear-view uprights, and robust hydraulic
system ensure productive operation in various environments. Operator
comfort features, combined with Clark's proven drivetrain components,
contribute to safe and efficient work cycles.
The Clark C20SL is a counterbalanced pneumatic tire forklift truck
designed for versatility and safety. It operates on LPG and is
controlled by a seated operator. Its rated load capacity is 2000 kg
(4409 lb) at a 500 mm (19.7 in) load centre. The load distance from the
drive axle centre to the fork face measures 397 mm (15.6 in), and the
truck has a wheelbase of 1400 mm (55.1 in).
The service weight of the truck when unladen is
3168 kg (6984 lb). When fully laden, the axle loading on the front axle
is 4459 kg (9830 lb) and on the rear axle is 709 kg (1563 lb). When
unladen, these figures shift to 1179 kg (2599 lb) on the front and 1989
kg (4385 lb) on the rear.
Basic Technical Data: The heart of the Clark C20SL is
the HMC Theta 2.4 L engine, a four-cylinder LPG unit. It has a total
displacement of 2359 cc (144 cu.in). The engine is rated to produce 38 kW (51
hp) at a rated speed of 2600 rpm.
Lubrication and Cooling: The system is designed to support continuous operation
in demanding conditions. The engine employs a forced lubrication system to
protect internal components. Liquid cooling is maintained by a belt-driven
centrifugal water pump and a radiator designed for efficient heat dissipation.
The engine features full-flow oil filtration.
Transmission: The C20SL is equipped with a CLARK TA12
single speed, full reversing, powershift transaxle. This transmission features a
high stall ratio industrial torque converter for smooth power delivery. It
allows for smooth direction changes without clutching, enhancing operator
efficiency and reducing fatigue. It features one forward gear and one reverse
gear, providing simple and intuitive control.
Travel Speed: The forklift achieves a maximum travel speed of 17.9 km/h (11.1
mph) when fully laden and 18.4 km/h (11.4 mph) when unladen. The reverse speeds
are consistent with forward speeds, ensuring reliable maneuverability in both
directions.
Axles and Brakes: The truck uses a drive axle configuration with full-floating
drive axles and two driven wheels on the front. The service brake system
features drum and shoe brakes, providing reliable stopping power for both laden
and unladen operations.
The electrical system operates at 12 V. The system is
responsible for starting the LPG engine and powering all lights and operator
interface components. The system features moisture-resistant electrical
connectors for durability. Specific battery capacity is not detailed in the
provided source material.
The Clark C20SL is fitted with pneumatic tyres,
designed for traction and comfort on various indoor and outdoor surfaces. It has
four wheels in total, with the front two being the driven wheels. The front tyre
size is 6.50 x 10 - 12PR (165 mm x 254 mm) and the rear tyre size is 5.00 x 8 -
10PR (127 mm x 203 mm). The front tread width measures 890 mm (35.0 in), and the
rear tread width is 890 mm (35.0 in). The body and frame are constructed of
heavy gauge steel for durability.
The Clark C20SL features full hydrostatic power steering with a priority
distributor ensuring steering priority in all conditions. The hydraulic system
includes a high-capacity pump that provides adequate oil supply for both the
upright and the hydrostatic steering simultaneously. The mast and fork carriage
can tilt forward and backward by 8 degrees in each direction to facilitate load
handling and secure transport.
The hydraulic system is a core component for lift and
tilt operations. It features a full-flow reverse filter that filters the oil to
the tank at each reverse flow, while rough particles are filtered directly via a
suction filter to prevent contamination. This design ensures a long service life
for all hydraulic components. A high-capacity pump provides adequate oil supply
for the upright and hydrostatic steering.
Load handling is controlled via a load-sensitive and precise control valve. A
safety valve provides extra safety and prevents uncontrolled lowering of the
load at all times. Operating pressure for attachments is up to 140 bar (2030
psi) maximum, with a rated flow for attachments up to 35 L/min (9.2 gpm)
maximum.
The Clark C20SL is equipped with clear-view uprights
available in Standard, Hilo, and Triplex versions. The heavy-duty interlocked
narrow profiles provide high strength even under the heaviest load. Adjustable
sealed canted (angled) rollers minimize deflection when handling off-set loads.
The tilt cylinders are mounted in spherical bearings for smooth operation. With
the mast fully lowered, the height to the top of the mast is 2240 mm (88.2 in).
The free lift, which is the height the forks can rise before the mast itself
begins to extend, is 110 mm (4.3 in). The maximum lift height for the standard
configuration is 3285 mm (129.3 in), at which point the mast extends to a total
height of 4507 mm (177.4 in) including the load backrest. The fork carriage is
DIN 15173 class IIA and has a width of 940 mm (37.0 in).
Load Capacity - 4,400 lb (2,000 kg)
Load Centre - 19.7 in (500 mm)
The lift speed for the 2000 kg (4409 lb) rated load is
0.65 m/s (128 ft/min) when laden and 0.68 m/s (134 ft/min) when unladen.
Lowering speed is controlled at 0.45 m/s (89 ft/min) for laden and 0.43 m/s (85
ft/min) for unladen conditions. The maximum drawbar pull, a measure of tractive
effort, is 14931 N (3357 lbf) for a laden truck and 6916 N (1555 lbf) for an
unladen truck.
The overall length of the truck, including the forks,
is 3358 mm (132.2 in). The length from the front face of the backrest to the
fork face is 2288 mm (90.1 in). The overall width of the truck is 1070 mm (42.1
in). The standard forks have dimensions of 40 mm (1.6 in) thick, 100 mm (3.9 in)
wide, and 1070 mm (42 in) long.
The height of the standard overhead guard is 2120 mm (83.5 in), with a cabin
height of 2135 mm (84.1 in). The seat height is 1100 mm (43.3 in). The coupling
height for towing is 310 mm (12.2 in). Ground clearance minimum below the mast
is 120 mm (4.7 in). At the centre of the wheelbase, ground clearance is 124 mm
(4.9 in).
For maneuvering in aisles, the right-angle stacking aisle width for pallets
measuring 1000 by 1200 mm (39.4 by 47.2 in) with the 1200 mm (47.2 in) side
across the width of the truck is 3751 mm (147.7 in). For pallets 800 by 1200 mm
(31.5 by 47.2 in) with the 1200 mm (47.2 in) side along the length of the truck,
the required aisle width is 3951 mm (155.6 in). The outer turning radius is 2154
mm (84.8 in), and the internal turning radius is 571 mm (22.5 in). The total
operating weight of the truck is 3168 kg (6984 lb).
Routine maintenance is centered on the reliable HMC
Theta 2.4 L LPG engine and the hydraulic system. Key maintenance items include
regular engine oil and filter changes, hydraulic oil checks and changes, and
transmission fluid checks. The hydraulic system's full-flow reverse filter and
suction filter help ensure long component life by preventing contamination. The
pneumatic tyres require periodic pressure checks and inspection for wear. The
drum and shoe brake system requires inspection of lining thickness and
adjustment as needed.
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