Clark C40D Specifications
The Clark C40D is a 4.0-tonne (8,818 lb) capacity,
diesel-powered, seated rider forklift, engineered for powerful performance in
demanding indoor and outdoor material handling applications. As a core model in
Clark's C-Series, this forklift is designed for intensive use in industries such
as heavy manufacturing, construction, building materials, and loading/unloading
transport.
Powered by the advanced Deutz TD3.6 diesel engine meeting Stage 3b / Tier 4i
emission standards, it delivers responsive power and reliable operation with
reduced maintenance requirements. Its robust construction, maintenance-free wet
disc brakes, and choice of duplex or triplex clear-view uprights ensure
productive, safe, and efficient operation in high-capacity environments.
Operator comfort and safety features, including hydrostatic power steering and
an auto-engaging electric parking brake, contribute to exceptional handling
performance.
The Clark C40D is a counterbalanced pneumatic tire forklift truck designed for
versatility and safety. It operates on diesel fuel and is controlled by a seated
operator. Its rated load capacity is 4000 kg (8818 lb) at a 500 mm (19.7 in)
load centre. The load distance from the drive axle centre to the fork face
measures 573 mm (22.6 in), and the truck has a wheelbase of 1950 mm (76.8 in).
The service weight of the truck when unladen is 6062 kg (13364 lb). When fully
laden, the axle loading on the front axle is 8892 kg (19603 lb) and on the rear
axle is 1170 kg (2579 lb). When unladen, these figures shift to 2675 kg (5897
lb) on the front and 3386 kg (7465 lb) on the rear.
The main component of the Clark C40D is the Deutz TD3.6
engine, a four-cylinder diesel unit with turbocharging. It has a total
displacement of 3.6 L (220 cu.in). The engine is rated to produce 55.4 kW (74.3
hp) at a rated speed of 2200 rpm. The engine features a DVERT oxidation
catalytic converter for exhaust gas aftertreatment, which eliminates the need
for a high-maintenance diesel particulate filter system. Peak torque is
approximately 5% higher than previous models, with reduced noise levels.
Lubrication and Cooling: The system is designed to support continuous operation
in demanding conditions. The engine employs a forced lubrication system with
full-flow filtration to protect internal components. Liquid cooling is
maintained by a belt-driven centrifugal water pump and a high-performance
radiator designed for efficient heat dissipation. Regular engine oil and filter
changes are required according to the planned maintenance intervals.
Transmission: The C40D is equipped with a two-gear
automatic transmission with powershift capability. This transmission 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. The transmission includes an integrated oil cooler
for durability during heavy use.
Travel Speed: The forklift achieves a maximum travel speed of 22.0 km/h (13.7
mph) when fully laden and 23.2 km/h (14.4 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 two or four
driven wheels on the front (2x2 / 4x2) depending on configuration. The service
brake system features maintenance-free wet disc brakes. The drive axle requires
regular inspection of mounting and fasteners, and the drive axle air vent should
be kept clean.
The electrical system operates at 12 V. The system is
responsible for starting the diesel engine and powering all lights and operator
interface components. The system features moisture-resistant electrical
connectors for durability. A 5" colour display for truck monitoring and security
functions is available. Specific battery capacity is not detailed in the
provided source material.
The Clark C40D is fitted with pneumatic tyres, designed
for traction and comfort on various indoor and outdoor surfaces. It has four or
six wheels in total depending on configuration, with the front two or four being
the driven wheels. The front tyre size is 8.25 x 15 - 14 PR (210 mm x 381 mm) ,
and the rear tyre size is 7.00 x 12 - 14 PR (178 mm x 305 mm). The front tread
width measures 1165 mm (45.9 in). The rear tread width is 1134 mm (44.6 in). The
body and frame are constructed of fully welded heavy gauge steel for durability.
The Clark C40D features hydrostatic power steering that eliminates steering
kick-back. The steering axle has pivotal bearings mounted in rubber steel
elements for durability and vibration dampening. The double acting steer
cylinder ensures precise and direct steering. A priority distributor ensures
steering priority in all conditions. The mast and fork carriage can tilt forward
by 8 degrees and backward by 10 degrees 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, ensuring a long service life for all
hydraulic components. A high-capacity pump provides adequate oil supply for the
upright and the 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. Regular inspection of hydraulic hoses, cylinders, and fluid levels is
required. Hydraulic sump oil filter and breather should be changed according to
maintenance intervals.
The Clark C40D is equipped with clear-view uprights
available in Standard (Duplex) and Triplex versions. With the mast fully
lowered, the height to the top of the mast is 2384 mm (93.9 in). The free lift,
which is the height the forks can rise before the mast itself begins to extend,
is 156 mm (6.1 in).
The maximum lift height for the standard
configuration is 3300 mm (129.9 in), at which point the mast extends to
a total height of 4552 mm (179.2 in) including the load backrest. The
fork carriage is DIN 15173 class III A and has a width of 1348 mm (53.1
in). Regular maintenance includes checking lift chain adjustment and
wear, lubricating lift chains, and lubricating upright rollers.
Load Capacity - 8,818 lb (4,000 kg)
Load Centre - 19.7 in (500 mm)
The lift speed for the 4000 kg (8818 lb) rated load is
0.55 m/s (108 ft/min) when laden and 0.57 m/s (112 ft/min) when unladen.
Lowering speed is controlled at 0.50 m/s (98 ft/min) for laden and 0.47 m/s (92
ft/min) for unladen conditions. The maximum drawbar pull, a measure of tractive
effort, is 40364 N (9074 lbf) for a laden truck and 13650 N (3069 lbf) for an
unladen truck. The maximum gradeability is recorded as 37.4%.
The overall length of the truck, including the forks,
is 4113 mm (161.9 in). The length from the front face of the backrest to the
fork face is 3043 mm (119.8 in). The overall width of the truck is 1400 mm (55.1
in). The standard forks have dimensions of 50 mm (2.0 in) thick, 122 mm (4.8 in)
wide, and 1067 mm (42 in) long.
The height of the standard overhead guard is 2324 mm (91.5 in), with a cabin
height of 2371 mm (93.3 in). The seat height is 1265 mm (49.8 in). The coupling
height for towing is 460 mm (18.1 in). Ground clearance minimum below the mast
is 169 mm (6.7 in). At the centre of the wheelbase, ground clearance is 212 mm
(8.3 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 4616 mm (181.7 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 4816 mm (189.6 in). The outer turning radius is 2843
mm (111.9 in), and the internal turning radius is 980 mm (38.6 in). The total
operating weight of the truck is 6062 kg (13364 lb).
Routine maintenance is centered on the reliable Deutz
TD3.6 diesel engine and the hydraulic system. The Deutz engine features a DVERT
oxidation catalytic converter that eliminates the need for a high-maintenance
diesel particulate filter system, reducing maintenance requirements.
Planned maintenance intervals are based on truck
operating hours as recorded on the hourmeter:
- Interval: 8-10 hours or daily - Visual inspection, test drive, air clean truck
and radiator.
- Interval: 50-250 hours or every month - Lubrication, replace diesel engine oil
and filter.
- Interval: 450-500 hours or every 6 months - Change diesel fuel filter (Deutz),
inspect/adjust fan belts, check transmission fluid level, check brake condition
and wear.
- Interval: 900-1000 hours or every 12 months - Change transmission fluid and
filter, clean drive axle air vent, lubricate steer axle linkage, check/lubricate
steer axle wheel bearings, change hydraulic sump oil filter and breather,
lubricate tilt cylinder rod ends.
- Interval: 2000 hours or every year - Drain/flush radiator coolant, check
engine ignition and timing, engine tune-up, check battery, change hydraulic sump
fluid and oil filter.
Key maintenance items include regular engine oil and filter changes, hydraulic
oil checks and changes, and transmission fluid maintenance. The hydraulic
system's full-flow reverse filter and suction filter help ensure long component
life by preventing contamination. The maintenance-free wet disc brakes require
no regular maintenance while providing strong braking effect even in wet or
dusty environments. The pneumatic tyres require periodic pressure checks and
inspection for wear.
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