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Clark C15D Specifications

Basic Information

The Clark C15D is a diesel-powered forklift that delivers a compelling balance of power, efficiency, and versatility for general material handling operations. Its core strength lies in the proven Yanmar 4TNV88 diesel engine, a four-cylinder powerplant providing dependable torque and reliability for continuous use. The machine rolls on pneumatic tires, offering excellent traction and shock absorption for uneven surfaces and outdoor terrain.

Operator control is facilitated through features like hydrostatic power steering and a fully-welded, heavy-gauge frame for stability. The C15D is equipped with a CLARK TA12 single-speed, full-reversing Powershift transaxle, designed for durability. With competitive travel and lift speeds for its class, the C15D is designed for productive operation across various applications.

This model is equipped with clear-view uprights, available in Standard, Hilo, and Triplex versions, featuring heavy-duty interlocked narrow profiles and adjustable sealed canted rollers to minimize deflection. It rolls on pneumatic tires, offering excellent stability and traction for outdoor use. The distance from the centre of the drive axle to the fork face is 15.4 in (392 mm). The wheelbase is 55.1 in (1,400 mm).

The total service weight of the truck is approximately 6,140 lb (2,785 kg). When fully laden, the axle load distribution places approximately 8,250 lb (3,744 kg) on the front axle and 1,220 lb (554 kg) on the rear axle. In an unladen state, the front axle load is 2,830 lb (1,283 kg), and the rear axle load is 3,340 lb (1,515 kg).

Engine Specs

The Clark C15D is powered by the Yanmar 4TNV88 diesel engine, a robust and reliable powerplant specifically designed for industrial operation. It is a four-cylinder, natural aspiration engine with a total displacement of 134 cu in (2,190 cc).

This engine produces a rated power of 38.6 hp (28.8 kW) at 2,400 rpm, with peak torque of 106 lb-ft (144 Nm) at 1,440 rpm. Lubrication is provided by a pressure-fed system ensuring all moving components are adequately lubricated. Cooling is managed by a liquid-cooled system designed to maintain optimal operating temperatures.

Drive Train

The drivetrain of the C15D is engineered for precise control and long-term durability. Transmission: It is fitted with a CLARK TA12 single speed, full-reversing Powershift transaxle with a high stall ratio industrial torque converter and full-floating drive axles.

Travel Speed: The forklift achieves a laden travel speed of 10.7 mph (17.2 km/h) and an unladen travel speed of 11.1 mph (17.9 km/h). Axles: The drive axle is located at the front, featuring a full-floating powertrain design for heavy load support. Brakes: The service brake system is hydraulic with drum and shoe design. The parking brake is a foot pedal type.

Electrical System

The electrical system is engineered to reliably support the engine, safety features, and lighting. It operates on a standard 12-volt architecture. The system powers the starter motor, engine control systems, and all essential lighting components for safe operation. A battery inspection is part of the daily maintenance routine, checking for damage, cracks, or leaking condition.

Wheels and Tires

The chassis provides a rigid and durable foundation, constructed from heavy-gauge steel with fully welded frame construction to support all major components under load stress.

Wheels and Tires: The C15D is fitted with pneumatic tires with 2 front and 2 rear wheels.
Front: 6.50 x 10 - 12PR
Rear: 5.00 x 8 - 10PR

Track Width:
Front: 35.0 in (890 mm)
Rear: 35.0 in (890 mm)

Drive Configuration: The vehicle utilizes a 2-wheel drive configuration, with the two front wheels serving as the driven wheels.

The steering system on the Clark C15D is a hydrostatic power steering system, providing the operator with smooth and effortless control during low-speed maneuvering and in confined spaces. A priority distributor in the hydraulic system ensures steering priority in all conditions.

Hydraulic System

The hydraulic system is responsible for powering the lifting, tilting, and any auxiliary functions. It utilizes a full-flow reverse filter which filters the oil to the tank at each reverse flow. Rough particles are filtered via a suction filter, ensuring long service life for all hydraulic components. A high-capacity pump provides adequate oil supply for the upright and hydrostatic steering.

The system operating pressure for attachments is up to 2,030 psi (140 bar). The main hydraulic pump has a rated flow of up to 9.2 gpm (35 L/min) for attachments. Load handling is controlled via a load-sensitive, precise control valve, and a safety valve prevents uncontrolled lowering of the load. The mast tilts forward by 8 degrees and backward by 8 degrees.

Mast Data

The standard mast configuration is available as a 2-stage or 3-stage, clear-view upright design depending on application requirements. Mast Height (Lowered): 88.1 in (2,240 mm).

Free Lift: 4.3 in (110 mm). This feature allows for lifting loads at low heights without increasing the overall mast height, a valuable function when entering trailers or working under low-clearance structures.

Maximum Fork Height: 129.6 in (3,285 mm). Mast Height (Extended) (with LBR): 177.2 in (4,502 mm).

Load Capacity

Load Capacity - 3,000 lb (1,500 kg)
Load Centre - 24 in (600 mm)

Performance Data

Lift Speed (Laden): 112 fpm (0.57 m/s)
Lift Speed (Unladen): 112 fpm (0.61 m/s)
Lowering Speed (Laden): 88 fpm (0.47 m/s)
Lowering Speed (Unladen): 88 fpm (0.43 m/s)
Max. Drawbar Pull (Laden): 3,359 lb (14,950 N)
Max. Drawbar Pull (Unladen): 1,689 lb (7,514 N)
Maximum Gradeability (Laden): 37.5 percent

Dimensions and Weight

Overall Length: 128.6 in (3,266 mm)
Length to Face of Forks: 86.4 in (2,196 mm)
Overall Width: 42.1 in (1,070 mm)
Fork Dimensions (Thickness x Width x Length): 1.57x4x42 in (40x100x1,070 mm)
Fork Carriage Width: 37 in (940 mm)
Fork Spread Maximum: 41 in (1,041 mm)
Height of Overhead Guard: 83.5 in (2,120 mm)
Seat Height: 43.3 in (1,100 mm)
Coupling Height: 12.2 in (310 mm)
Ground Clearance (Minimum): 4.7 in (120 mm)
Ground Clearance (Centre of Wheelbase): 4.9 in (124 mm)
Aisle Width for Pallet 1000 x 1200 (crossways): 144.3 in (3,665 mm)
Aisle Width for Pallet 800 x 1200 (lengthways): 152.2 in (3,865 mm)
Basic Right Angle Stacking Aisle Width: 97.0 in (2,465 mm)
Turning Radius (Outside): 81.6 in (2,073 mm)
Internal Turning Radius: 22.5 in (571 mm)
Weight (empty): 6,140 lb (2,785 kg)

Maintenance Data

Daily (8-10 hours) checks include visual inspection for damage and leaks, checking the LPG system for leaks (if applicable), checking gas hoses, inspecting wheels and tires for damage and loose wheel nuts, checking engine coolant level, and checking service brake pedal play and operation.

Monthly (50-250 hours) maintenance includes test driving the truck, lubricating the truck, air cleaning the truck and radiator, and checking torque on critical fasteners.

Semi-Annual (450-500 hours) maintenance includes draining and replacing engine oil, replacing the engine oil filter, cleaning and replacing the diesel engine air filter, changing the diesel fuel filter, inspecting and adjusting fan belts, and checking the battery.

Annual (900-1000 hours) maintenance includes draining and flushing the radiator coolant, changing the transaxle fluid, replacing the transaxle oil filter, checking brake condition and wear, checking drive axle mounting, lubricating steer axle linkage, checking and lubricating steer axle wheel bearings, replacing the hydraulic sump oil filter and breather, replacing hydraulic sump fluid, lubricating tilt cylinder rod ends, and checking lift chain adjustment and wear. The engine air cleaner element should be changed or serviced every 1,000 operating hours for a diesel engine.

2000 Hours maintenance includes changing the transaxle fluid.

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