Clark C50SD Specifications
The Clark C50SD is a heavy-duty internal-combustion
pneumatic-tire forklift engineered for demanding industrial environments
requiring high lifting capacity, rugged powertrain durability, and long-term
operational dependability.
With a nominal lifting capacity of 5,000 kg
(11,000 lb), the C50SD belongs to Clark’s S-Series diesel lineup, known
for robust structural design, exceptional stability, and highly
serviceable mechanical systems. Designed for steel-processing centers,
construction-material depots, ports, heavy manufacturing, lumber yards,
outdoor equipment yards, and industrial distribution hubs, the C50SD
delivers powerful performance backed by durable engineering.
The reinforced steel chassis, high-capacity
mast structure, heavy-duty drive axle, and powerful diesel engine allow
reliable load-handling even in harsh outdoor conditions. The operator
compartment emphasizes comfort, visibility, vibration reduction, and
intuitive control layout.
Technicians benefit from easy engine access,
simplified hydraulic routing, and long component life. The Clark C50SD
stands out for its rugged reliability, predictable load control, and
suitability for continuous heavy-use applications.
The Clark C50SD is typically equipped with industrial
diesel engines such as the Yanmar 4TNE106T or the Doosan D34 diesel engine
depending on model year and emissions requirements. These engines emphasize
low-end torque, low fuel consumption, simple mechanical design, and long
durability under high-load operation.
Engine Option (Yanmar 4TNE106T Turbo
Diesel):
- Configuration: inline 4-cylinder, 4-stroke, turbocharged diesel
- Displacement: approx. 3.5 L
- Bore/stroke: approx. 106x125 mm (4.17x4.92 in)
- Power output: approx. 60-70 kW (80-94 hp)
- Peak torque: approx. 260-320 Nm (192-236 lb-ft)
- Rated speed: approx. 2,400 rpm
- Idle speed: approx. 800-900 rpm
Engine Option (Doosan D34 Diesel):
- Displacement: approx. 3.4 L
- Power output: approx. 55-70 kW (74-94 hp)
- Torque: approx. 240-300 Nm (177-221 lb-ft)
Engine Construction:
- Cast-iron heavy-wall block with deep ribbing
- Reinforced cast-iron head with high-temperature alloy valves
- Forged-steel crankshaft supported by 5 large main bearings
- Aluminum pistons with oil-cooled undersides
- High-strength connecting rods for heavy load cycles
Fuel System:
- High-pressure mechanical or common-rail fuel injection
- Multi-stage filtration with water separator
- Direct injection for efficient combustion
Lubrication System:
- Full-pressure wet-sump lubrication
- Crankshaft-driven gear-type oil pump
- Oil capacity: approx. 8-12 L (8.4-12.7 qt)
- Normal pressure: approx. 300-450 kPa (44-65 psi)
- Oil type: SAE 15W-40 diesel grade
- Spin-on full-flow oil filter
Cooling System:
- Liquid-cooled system with high-capacity radiator
- Belt-driven centrifugal water pump
- Coolant capacity: approx. 12-16 L (12.7-16.9 qt)
- Thermostat opens at approx. 82°C (180°F)
- Cooling system pressure: approx. 13 psi (90 kPa)
The C50SD uses a heavy-duty industrial powershift
transmission engineered for large torque loads.
Transmission:
- Type: torque-converter powershift
- Speeds: forward and reverse, single or two-speed depending on model
- Forward speed (unladen): approx. 20-22 km/h (12-14 mph)
- Reverse speed: approx. 17-20 km/h (10-12 mph)
- Fluid capacity: approx. 12-16 L (12.7-16.9 qt)
- Recommended fluid: Dexron III or Clark-approved ATF
- Direction change: steering-column lever with hydraulic clutch packs
Drive Axle:
- Heavy cast-steel differential housing
- Planetary reduction hubs on drive wheels
- Axle lubricant capacity: approx. 10-14 L (10.5-14.8 qt)
- Recommended lubricant: SAE 80W-90 or 85W-140 gear oil
Brake System:
- Oil-immersed wet-disc brakes (standard)
- Parking brake: mechanical lever-actuated drum or disc brake
- Wet-disc design provides long service life in dusty outdoor conditions
- System voltage: 12 V
- Battery capacity: approx. 90-120 Ah
- Alternator output: approx. 60-100 A
- Starter motor power: approx. 2.5-3.5 kW
- Electrical harness: insulated industrial-grade wiring
- Safety interlocks: operator-presence, neutral-start, parking brake switch
- Lighting: headlights, taillights, optional cab roof lights
Drive System:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2WD with high-traction pneumatic tires
Tire Specifications (Pneumatic):
- Front tires: approx. 300-15 or equivalent heavy-duty size
- Rear tires: approx. 7.00-12 or equivalent
Optional Tires:
- Solid pneumatic for debris-heavy environments
- Lug pattern outdoor tires
- Non-marking tires for special applications
Chassis Structure:
- Fully welded heavy-gauge steel frame
- Reinforced mast base and overhead guard
- Low center of gravity enhances load stability
- Internal protection for hydraulic and electrical lines
Steering:
- Fully hydrostatic power steering
- Steering pump flow: approx. 12-20 L/min (3.2-5.3 gpm)
- Rear-axle steering with large pivot bearings
- Turning radius: approx. 2.8-3.2 m (110-126 in)
- Steering feel: stable and predictable under heavy loads
- Maximum system pressure: approx. 2,300-2,700 psi
(159-186 bar)
- Pump type: engine-driven external gear pump
- Pump flow: approx. 60-90 L/min (16-24 gpm)
- Hydraulic reservoir: approx. 45-60 L (47-63 qt)
- Hydraulic fluid: ISO VG 32 or 46
- Lift cylinders: dual or triple cylinders depending on mast height
- Tilt cylinders: dual heavy-duty tilt cylinders
- Auxiliary circuits: available for clamps, rotators, sideshift, fork
positioners
| Service Refill Capacities |
- Engine oil: approx. 8-12 L (8.4-12.7 qt)
- Cooling system: approx. 12-16 L (12.7-16.9 qt)
- Transmission fluid: approx. 12-16 L (12.7-16.9 qt)
- Drive axle oil: approx. 10-14 L (10.5-14.8 qt)
- Hydraulic oil: approx. 45-60 L (47-63 qt)
Mast Types:
- Duplex (2-stage)
- Triplex (3-stage full free-lift)
Lift Height Ranges:
- Duplex mast: approx. 3.0-4.0 m (118-157 in)
- Triplex mast: approx. 4.5-6.0 m (177-236 in)
Free Lift:
- 0.2-1.2 m (8-47 in) depending on mast type
Fork Specifications:
- Standard fork lengths: 1,067-1,219 mm (42-48 in)
- Optional forks: 1,524 mm (60 in) and longer
- Fork width: approx. 125-150 mm (5-6 in)
- Fork thickness: approx. 45-60 mm (1.8-2.4 in)
- Rated capacity: 5,000 kg (11,000 lb) at 600 mm (24
in) load center
De-rating occurs with:
- increased lift height
- long forks
- attachments (clamps, sideshift, rotators)
- off-center loading
- incline or uneven terrain
- Lift speed (unladen): approx. 0.40-0.55 m/s (80-110
ft/min)
- Lift speed (laden): approx. 0.25-0.35 m/s (50-70 ft/min)
- Lowering speed (unladen): approx. 100-140 ft/min
- Lowering speed (laden): approx. 130-160 ft/min
- Travel speed (unladen): approx. 20-22 km/h (12-14 mph)
- Travel speed (laden): approx. 14-17 km/h (9-10.5 mph)
- Gradeability (unladen): approx. 25-30%
- Gradeability (laden): approx. 15-18%
- Drawbar pull: approx. 25,000-40,000 N (5,620-8,990 lbf)
- Overall length to fork face: approx. 3.3-3.6 m
(130-142 in)
- Overall width: approx. 1.5-1.7 m (59-67 in)
- Overhead guard height: approx. 2.3-2.5 m (91-98 in)
- Wheelbase: approx. 2.0-2.2 m (79-87 in)
- Ground clearance: approx. 150-220 mm (5.9-8.7 in)
- Turning radius: approx. 2.8-3.2 m (110-126 in)
- Aisle width (1000x1200 pallet): approx. 4.5-5.0 m (177-197 in)
- Maximum fork height: 3.0-6.0 m depending on mast
- Free lift: 0.2-1.2 m
- Fork options: 42-72 in
- Operating weight: approx. 6,500-8,500 kg (14,330-18,740 lb)
- Counterweight mass: approx. 2,500-3,500 kg (5,512-7,716 lb)
250-Hour
Maintenance:
- Replace engine oil and filter
- Lubricate mast channels and linkages
- Clean air filter
- Clean radiator core
- Check battery condition
500-Hour Maintenance:
- Replace fuel filter
- Inspect driveline shaft
- Inspect brake components
- Check axle seals
1,000-Hour Maintenance:
- Replace transmission oil
- Replace drive axle lubricant
- Inspect hydraulic cylinders and lines
- Check mast chain stretch and alignment
2,000-Hour Maintenance:
- Replace hydraulic oil
- Replace coolant
- Perform complete mast structural inspection
- Test operational interlocks and safety systems
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| Front-End Loader Specifications |