Clark C30D Specifications
The Clark C30D is a mid-capacity diesel-powered
pneumatic-tire forklift engineered for industrial applications requiring
dependable outdoor capability, strong lifting performance, and long-term
mechanical durability. With a nominal lifting capacity of 3,000 kg (6,600
pounds), the C30D is widely used in construction-material facilities, lumber
yards, steel and metal processing centers, logistics terminals, heavy
warehousing operations, and manufacturing plants.
Its rugged design, stable chassis,
high-traction pneumatic tires, and balanced hydraulic performance allow
the machine to function effectively over uneven or outdoor surfaces
while maintaining predictable load handling.
Clark, one of the oldest and best-known forklift manufacturers in the
world, emphasizes reliability and simplicity in the C-Series lineup. The
C30D reflects this philosophy by integrating a welded-steel frame,
reinforced mast structure, industrial diesel powertrain, and minimal
electronic complexity. Operators appreciate the wide operator
compartment, comfortable ride, clear forward visibility, ergonomic
control levers, and refined pedal layout.
Maintenance personnel value the machine’s
open-access engine bay, durable hydraulic routing, easily serviced
wet-disc brakes, and straightforward mechanical construction. The result
is a forklift well-suited to continuous-duty industrial environments
where uptime, load stability, and serviceability are essential.
The Clark C30D is commonly equipped with diesel
industrial engines such as the Yanmar 4TNE98 or, in later variants, the Doosan
D24 diesel engine. These engines emphasize high torque output at low to midrange
rpm, low fuel consumption, stable combustion, and long component life.
Engine Option 1 (Yanmar 4TNE98):
- Configuration: inline 4-cylinder, 4-stroke diesel
- Displacement: approx. 3.3 liters
- Bore/stroke: approx. 98x110 mm (3.86x4.33 in)
- Power output: approx. 44-48 kW (59-64 hp)
- Peak torque: approx. 200-220 Nm (148-162 lb-ft)
- Rated speed: approx. 2,400-2,500 rpm
- Idle speed: approx. 800-900 rpm
Engine Option 2 (Doosan D24 Diesel):
- Displacement: approx. 2.4 liters
- Power output: approx. 35-45 kW (47-60 hp)
- Peak torque: approx. 160-190 Nm (118-140 lb-ft)
Engine Construction:
- Cast-iron block and head
- Forged-steel crankshaft with multiple main bearings
- High-strength connecting rods
- Aluminum alloy pistons with oil-cooling galleries
- Swirl-type combustion chambers
Fuel System:
- Type: mechanical injection pump
- Fuel filtration: water separator + primary + fine filter
- Injector pressure: approx. 130-180 MPa
- Injection timing: mechanically governed for reliability
Lubrication System:
- Type: full-pressure wet sump
- Oil pump: gear-type, crankshaft driven
- Oil capacity: approx. 7-9 L (7.4-9.5 qt)
- Oil pressure: approx. 300-450 kPa (44-65 psi)
- Recommended oil: SAE 15W-40 diesel engine oil
- Filtration: full-flow spin-on filter
Cooling System:
- Type: liquid-cooled, forced circulation
- Coolant capacity: approx. 9-11 L (9.5-11.6 qt)
- Thermostat: opens at approx. 82°C (180°F)
- Radiator: industrial heavy-duty copper or aluminum core
- System pressure: approx. 13 psi (90 kPa)
- Pump: belt-driven centrifugal water pump
The C30D is fitted with an industrial-grade powershift
transmission designed for heavy cyclic use.
Transmission:
- Type: torque-converter powershift
- Forward speeds: 1 or 2 depending on configuration
- Forward speed (unladen): approx. 18-20 km/h (11-12.5 mph)
- Reverse speed: approx. 16-18 km/h (10-11 mph)
- Fluid capacity: approx. 8-10 L (8.4-10.5 qt)
- Recommended fluid: ATF Dexron III or Clark-approved ATF
- Shifting: hydraulic clutch packs actuated through a column-mounted lever
Drive Axle:
- Construction: cast-steel differential housing
- Final drive: planetary reduction hubs
- Axle oil capacity: approx. 6-8 L (6.3-8.4 qt)
- Gear lubricant: SAE 80W-90 or 85W-140
Brake System:
- Service brakes: oil-immersed wet-disc brakes
- Parking brake: manual lever-operated drum brake
- Wet-disc design provides long service intervals and consistent braking under
debris and moisture
- System voltage: 12 V
- Battery capacity: approx. 70-90 Ah
- Alternator output: approx. 50-80 A
- Starter motor: approx. 2.5-3.0 kW
- Safety circuits: neutral-start, operator presence, glow-plug relay (diesel)
- Exterior lighting: headlights, taillights, turn signals
- Optional lighting: overhead work lamps, beacon
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Type: 2WD industrial forklift
Tire Specifications (Pneumatic):
- Front tires: approx. 28x9-15
- Rear tires: approx. 6.50-10
Optional Tires:
- Solid pneumatic tires
- Lug-pattern deep-tread tires
- Non-marking tires for mixed indoor/outdoor duty
Chassis Construction:
- Fully welded high-strength frame
- Reinforced mast support with wide base plates
- Low center of gravity for stable operation under heavy load
- Integrated counterweight optimized for load balance
- Hydraulic and electric lines protected inside frame routing
Steering:
- Steering type: hydrostatic power steering
- Steering pump flow: approx. 10-16 L/min (2.6-4.2 gpm)
- Steering axle: oscillating rear axle with center pivot
- Turning radius: approx. 2.2-2.4 m (87-95 in)
- Steering characteristics: light, precise, stable during travel and load
handling
- Maximum hydraulic pressure: approx. 2,200-2,400 psi
(152-165 bar)
- Pump type: external gear pump, engine-driven
- Pump flow: approx. 45-60 L/min (12-16 gpm)
- Hydraulic reservoir: approx. 35-45 L (37-47 qt)
- Fluid type: ISO VG 32 or ISO VG 46
- Lift cylinders: double-acting industrial cylinders with cushioning
- Tilt cylinders: dual heavy-duty cylinders with controlled return flow
- Optional auxiliary circuits: sideshift, clamp, rotator, fork positioner
| Service Refill Capacities |
- Engine oil: 7-9 L (7.4-9.5 qt)
- Cooling system: 9-11 L (9.5-11.6 qt)
- Transmission oil: 8-10 L (8.4-10.5 qt)
- Drive axle oil: 6-8 L (6.3-8.4 qt)
- Hydraulic oil: 35-45 L (37-47 qt)
Mast Types:
- V (2-stage duplex)
- FV (3-stage triplex full-free-lift)
Lift Heights:
- Duplex: approx. 3.0-4.0 m (118-157 in)
- Triplex: approx. 4.5-6.0 m (177-236 in)
Free Lift:
- Approx. 0.2-1.2 m (8-47 in)
Fork Specifications:
- Standard fork length: 1,067-1,219 mm (42-48 in)
- Optional forks: 1,524 mm (60 in)
- Fork width: approx. 100-125 mm (4-5 in)
- Fork thickness: approx. 40-45 mm (1.6-1.8 in)
- Rated capacity: 3,000 kg (6,000-6,600 lb) at 600 mm
(24 in) load center
De-rating occurs with:
- increased lift height
- fork extensions or long forks
- heavy attachments (clamps, rotators)
- off-center loading
- uneven terrain or operating slope
- 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. 100-140 ft/min
- Lowering speed (laden): approx. 130-160 ft/min
- Travel speed (unladen): approx. 18-20 km/h (11-12.5 mph)
- Travel speed (laden): approx. 14-16 km/h (9-10 mph)
- Gradeability (unladen): approx. 25-30%
- Gradeability (laden): approx. 15-18%
- Drawbar pull: approx. 20,000-30,000 N (4,500-6,700 lbf)
- Overall length to fork face: approx. 2.6-2.8 m
(102-110 in)
- Overall width: approx. 1.15-1.25 m (45-49 in)
- Overhead guard height: approx. 2.1-2.2 m (83-87 in)
- Wheelbase: approx. 1.7-1.8 m (67-71 in)
- Ground clearance: approx. 120-150 mm (4.7-6.0 in)
- Turning radius: approx. 2.2-2.4 m (87-95 in)
- Aisle width (1000x1200 mm pallet): approx. 3.8-4.2 m (149-165 in)
- Maximum fork height: 3.0-6.0 m depending on mast
- Free lift: 0.2-1.2 m
- Fork lengths: 42-60 in
- Operating weight: approx. 4,500-5,400 kg (9,920-11,905 lb)
- Counterweight mass: approx. 1,200-1,800 kg (2,645-3,968 lb)
250-Hour
Maintenance:
- Replace engine oil and filter
- Lubricate mast channels and pivot points
- Clean air filter
- Clean radiator fins
- Inspect battery and terminals
500-Hour Maintenance:
- Replace fuel filter
- Inspect driveline and propeller shaft
- Inspect brake assemblies
- Check axle seals for leakage
1,000-Hour Maintenance:
- Replace transmission fluid
- Replace drive axle lubricant
- Inspect hydraulic cylinders
- Check chain stretch and mast alignment
2,000-Hour Maintenance:
- Replace hydraulic oil
- Replace coolant
- Perform full mast structural inspection
- Test electrical and safety interlocks
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