Clark CMP40D Specifications
The Clark CMP40D is a mid-to-heavy capacity
diesel-powered pneumatic-tire forklift engineered for demanding industrial
environments that require stable load handling, rugged traction capability,
powerful engine performance, and simplified maintenance.
With a nominal lifting capacity of
approximately 4,000 kg (8,800 lb), the CMP40D is designed for outdoor
material-handling operations in lumber yards, metal fabrication
facilities, construction-material depots, agricultural processing yards,
manufacturing plants, ports, logistics terminals, and high-duty
distribution operations.
The CMP40D integrates a reinforced welded-steel chassis, high-traction
pneumatic tires, a durable diesel engine, and a powershift transmission
optimized for consistent torque delivery. Operators benefit from clear
sight lines, balanced weight distribution, a well-designed operator
compartment, ergonomic control levers, and predictable hydrostatic
steering performance.
Maintenance personnel appreciate the open
engine access, straightforward hydraulic routing, durable brake systems,
and logical component organization. The CMP40D is built for long service
life with a focus on reliability, ease of service, and low total
lifecycle cost.
The Clark CMP40D is typically equipped with robust
industrial diesel engines optimized for high torque output, efficient fuel
consumption, and long-term mechanical durability. Common engine configurations
include the Isuzu 4JG1/4JB1 diesel family, Yanmar 4TNE series diesels, or
Mitsubishi S4S-D diesel engines depending on production batch and emissions
standards.
Isuzu 4JG1 Industrial Diesel:
- Configuration: inline 4-cylinder, 4-stroke diesel
- Displacement: approx. 3.1-3.4 liters
- Power output: approx. 45-55 kW (60-74 hp)
- Peak torque: approx. 180-220 Nm (133-162 lb-ft)
- Rated speed: approx. 2,400-2,600 rpm
- Idle speed: approx. 800-900 rpm
- Fuel system: indirect injection with mechanical pump
Yanmar 4TNE94 / 4TNE98 Diesel:
- Displacement: approx. 3.0-3.3 liters
- Output: approx. 44-50 kW (59-67 hp)
- Torque: approx. 200-230 Nm (148-170 lb-ft)
Mitsubishi S4S-D Diesel:
- Output range: approx. 40-55 kW (54-74 hp)
- Smooth low-rpm torque ideal for forklift load cycles
Engine Construction:
- Heavy-duty cast-iron block
- Cast-iron cylinder head with heat-resistant valves
- Forged crankshaft supported by multiple main bearings
- Aluminum pistons with oil-cooling galleries
- High-strength connecting rods
- Industrial valve train designed for continuous load cycles
Fuel System:
- Mechanical injection pump
- Multi-stage filtration with water separator
- High-efficiency industrial air cleaner
- Fuel lift pump integrated into injection system
Lubrication System:
- Full-pressure forced lubrication
- Gear-driven oil pump
- Oil capacity: approx. 7-9 L (7.4-9.5 qt)
- Operating pressure: approx. 300-450 kPa (44-65 psi)
- Recommended oil: SAE 15W-40 diesel grade
- Replaceable spin-on full-flow oil filter
Cooling System:
- Liquid cooling with forced circulation
- Belt-driven centrifugal water pump
- Coolant capacity: approx. 8-12 L (8.4-12.7 qt)
- Thermostat opens at approx. 82°C (180°F)
- Heavy-duty radiator for outdoor airflow
- Cooling system pressure: approx. 13 psi (90 kPa)
The CMP40D uses a heavy-duty industrial powershift
transmission designed for demanding load cycles with frequent directional
changes.
Transmission:
- Type: torque-converter powershift
- Gears: forward, reverse
- Forward travel speed (unladen): approx. 18-20 km/h (11-12.5 mph)
- Reverse speed (unladen): approx. 16-18 km/h (10-11 mph)
- Transmission oil capacity: approx. 8-12 L (8.4-12.7 qt)
- Recommended fluid: Dexron III or Clark-approved ATF
- Direction control: steering-column mounted lever with hydraulic clutch packs
Drive Axle:
- Construction: cast-steel differential housing
- Final reduction: planetary hub gears
- Axle lubricant capacity: approx. 6-8 L (6.3-8.4 qt)
- Recommended gear oil: SAE 80W-90 or 85W-140
Brake System:
- Service brakes: hydraulic drum brakes (std) or optional oil-immersed wet-disc
brakes
- Parking brake: mechanical hand-lever drum brake
- Designed for safe braking performance across mixed outdoor surfaces
- System voltage: 12 V
- Battery capacity: approx. 70-100 Ah
- Alternator capacity: approx. 40-80 A
- Starter motor output: approx. 1.8-2.5 kW
- Electrical harness: industrial heat- and abrasion-resistant loom
- Safety switches: neutral-start interlock, operator-presence switch
- Lighting system: headlights, rear lamps, optional roof-mounted work lights
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive system: 2WD pneumatic-tire configuration
Pneumatic Tires:
- Front tire size: approx. 28x12-16 or similar industrial size
- Rear tire size: approx. 7.00x12 or similar
Optional Tires:
- Solid pneumatic tires for debris-heavy yards
- Lug-pattern tires for traction on loose gravel
- Non-marking tires for mixed indoor/outdoor environments
Chassis Structure:
- Fully welded heavy-gauge steel frame
- Reinforced mast mounting base
- Integrated heavy counterweight for stability
- Protected hydraulic and electrical routing beneath frame plates
Steering:
- Type: fully hydrostatic power steering
- Steering pump flow: approx. 10-15 L/min (2.6-4.0 gpm)
- Steering axle: oscillating rear axle with heavy-duty pivot bearings
- Turning radius: approx. 2.3-2.6 m (91-102 in)
- Steering behavior: smooth, predictable, stable under load
- Maximum hydraulic pressure: approx. 2,200-2,500 psi
(152-172 bar)
- Pump type: engine-driven external gear pump
- Pump flow: approx. 35-55 L/min (9-14.5 gpm)
- Hydraulic reservoir capacity: approx. 30-45 L (32-47 qt)
- Recommended fluid: ISO VG 32 or 46
- Lift cylinders: dual double-acting cylinders
- Tilt cylinders: dual cylinders with cushioning and load-holding check valves
- Optional auxiliary circuits: sideshift, fork positioner, clamp attachments
| Service Refill Capacities |
- Engine oil: approx. 7-9 L (7.4-9.5 qt)
- Cooling system: approx. 8-12 L (8.4-12.7 qt)
- Transmission: approx. 8-12 L (8.4-12.7 qt)
- Drive axle: approx. 6-8 L (6.3-8.4 qt)
- Hydraulic oil: approx. 30-45 L (32-47 qt)
Mast Types:
- Two-stage V mast (duplex)
- Three-stage FV mast (triplex full free-lift)
Lift Height Options:
- Duplex: approx. 3.0-4.0 m (118-157 in)
- Triplex: approx. 4.5-6.0 m (177-236 in)
Free Lift:
- Approx. 0.2-1.0 m (8-39 in) depending on mast type
Fork Specifications:
- Standard fork length: 1,067-1,219 mm (42-48 in)
- Optional forks: up to 1,524 mm (60 in)
- Fork width: approx. 125-150 mm (5-6 in)
- Fork thickness: approx. 45-60 mm (1.8-2.4 in)
- Rated lifting capacity: 4,000 kg (8,800 lb) at 600 mm
(24 in) load center
De-rating conditions:
- increased mast height
- long forks or fork extensions
- heavy attachments
- off-center load geometry
- sloped 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. 90-130 ft/min
- Lowering speed (laden): approx. 110-150 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. 20-25%
- Gradeability (laden): approx. 12-15%
- Drawbar pull: approx. 15,000-20,000 N (3,370-4,496 lbf)
- Overall length to fork face: approx. 2.7-3.0 m
(106-118 in)
- Overall width: approx. 1.3-1.5 m (51-59 in)
- Overhead guard height: approx. 2.2-2.3 m (87-91 in)
- Wheelbase: approx. 1.7-1.9 m (67-75 in)
- Ground clearance: approx. 120-150 mm (4.7-6.0 in)
- Turning radius: approx. 2.3-2.6 m (91-102 in)
- Aisle width (1000x1200 pallet): approx. 4.0-4.4 m (157-173 in)
- Maximum fork height: 3.0-6.0 m depending on mast configuration
- Free lift: 0.2-1.0 m
- Fork lengths: 42-60 in
- Operating weight: approx. 4,500-6,000 kg (9,920-13,228 lb)
- Counterweight mass: approx. 1,800-2,800 kg (3,968-6,173 lb)
250-Hour
Maintenance:
- Replace engine oil and filter
- Clean radiator and air cleaner
- Lubricate mast channels and pivot points
- Battery inspection and cleaning
500-Hour Maintenance:
- Replace fuel filter
- Inspect driveline and propeller shafts
- Check brake shoes/drums or wet-disc system
- Inspect axle seals for leakage
1,000-Hour Maintenance:
- Replace transmission oil
- Replace axle lubricant
- Inspect hydraulic cylinders and hoses
- Check mast chain stretch and alignment
2,000-Hour Maintenance:
- Replace hydraulic oil
- Replace coolant
- Perform complete mast structural inspection
- Test operational and safety interlocks
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