Cat DP40NM1 Specifications
The Caterpillar DP40NM1 is a high-performance 4.0-ton
(4,000 kg / 8,818 lb) diesel-powered pneumatic-tire forklift designed for
intense industrial operations requiring high torque output, exceptional
structural durability, long-duty cycle endurance, superior cooling capability,
and predictable heavy-lift stability. As part of Caterpillar’s NM1-Series, this
model is engineered for outdoor yards, construction-material distribution
centers, heavy manufacturing facilities, steel and industrial fabrication yards,
high-demand logistics terminals, and rough-surface industrial environments.
Powered by the robust Mitsubishi S6S 5.0-liter naturally aspirated industrial
diesel engine, the DP40NM1 delivers reliable low-RPM torque, smooth acceleration
under load, and long service life. The 5L S6S engine is favored for its
mechanical simplicity, low maintenance requirements, and strong thermal
stability under multi-shift heavy operations. The DP40NM1 features a reinforced
heavy-steel chassis, industrial-grade powershift transmission, high-capacity
hydraulic system, durable pneumatic tires, and a high-visibility mast design
optimized for maximum operator confidence and safety.
The operator environment is carefully designed for comfort and control,
featuring reduced vibration, improved seat ergonomics, an intuitive layout of
control levers, excellent forward mast visibility, and simplified access to
daily service points. Maintenance personnel benefit from centralized filter
placement, wide-opening engine panels, durable electrical harnessing, and
accessible hydraulic and driveline service checkpoints.
The Caterpillar DP40NM1 is equipped with the Mitsubishi
S6S heavy-duty industrial diesel engine.
Mitsubishi S6S (5-Liter Variant) - Basic
Technical Specifications:
- Engine type: inline 6-cylinder, 4-stroke, naturally aspirated
- Displacement: approx. 5.0 liters (4,996 cc)
- Bore x stroke: approx. 94 x 120 mm (3.70 x 4.72 in)
- Rated industrial output: approx. 65-75 kW (87-101 hp) @ 2,300-2,500 rpm
- Peak torque: approx. 300-350 Nm (221-258 lb-ft) @ 1,600-1,800 rpm
- Combustion system: swirl-chamber diesel
- Fuel system: mechanical in-line injection pump
- Aspiration: naturally aspirated
- Idle speed: approx. 750 ± 50 rpm
- Emissions level: dependent on region
- Known for: extremely long lifespan, low fuel consumption, and high mechanical
reliability
Lubrication System:
- Type: full-pressure wet-sump
- Oil pump: internal gear-type
- Oil capacity: approx. 10-12 L (10.5-12.7 qt)
- Normal oil pressure: approx. 300-450 kPa (44-65 psi)
- Recommended oil: SAE 10W-30 or 15W-40 (API CF/CG/CH diesel grade)
- Filtration: spin-on full-flow industrial filter
Cooling System:
- Cooling type: liquid-cooled (heavy-duty industrial radiator)
- Coolant capacity: approx. 14-18 L (14.8-19 qt)
- Thermostat opening temperature: approx. 82°C (180°F)
- Fully open near: 95°C (203°F)
- Radiator design: fin-tube high-capacity
- Cooling fan: mechanical engine-driven
- Water pump: belt-driven centrifugal type
- System pressure: approx. 100-120 kPa (15-17 psi).
Transmission:
- Type: heavy-duty industrial powershift
- Forward gears: 1-2
- Reverse gears: 1-2
- Direction change: electric-over-hydraulic selector
- Travel speed (unladen): approx. 18-20 km/h (11-12 mph)
- Travel speed (laden): approx. 16-18 km/h (10-11 mph)
- Transmission fluid capacity: approx. 10-14 L (10.5-14.8 qt)
- Recommended fluid: Dexron III ATF or approved powershift oil
- Transmission cooling: integrated oil-to-air cooler
Front Drive Axle:
- Axle type: reinforced rigid industrial axle
- Differential: bevel-gear differential
- Axle oil capacity: approx. 5.0-6.5 L (5.3-6.9 qt)
- Lubricant: SAE 80W-90 gear oil
Rear Steering Axle:
- Type: oscillating center-pivot
- Oscillation: approx. ±8-10 degrees
- Lubrication capacity: approx. 1.0-1.5 L
Braking System:
- Service brakes: hydraulic drum brakes (dual-leading-shoe)
- Parking brake: mechanical lever-actuated drum brake
- Optional brake system: oil-cooled wet-disc brakes depending on market
- Brake actuation: hydraulic master cylinder.
- System voltage: 12 V
- Battery capacity: approx. 90-130 Ah
- Alternator output: approx. 50-80 A
- Starter motor: approx. 2.5-3.0 kW
- Electrical harness: sealed connectors, abrasion-resistant conduit
Instrumentation includes:
- engine oil pressure warning lamp
- coolant temperature warning
- charging system indicator
- glow plug indicator
- parking brake indicator
- hour meter.
Drive
Configuration:
- Front-wheel drive
- Rear-wheel steering
- Drive type: 2-wheel drive (pneumatic-tire forklift)
Tires (Pneumatic Standard):
- Front tires: approx. 8.25-15
- Rear tires: approx. 7.00-12
- Optional tire configurations: solid pneumatic, non-marking compounds
Chassis Structure:
- Fully welded heavy-steel frame
- High-mass integrated counterweight
- Reinforced overhead guard structure
- Anti-slip steps and ergonomic entry points
- Rubber engine mounts for vibration reduction
- Protected routing for hydraulic and electrical systems
Steering:
- Steering type: fully hydrostatic
- Steering pump: approx. 6-14 L/min (1.5-3.7 gpm)
- Steering cylinder: double-acting
- Steer axle: oscillating pivot-type
- Turning radius: approx. 2.4-2.6 m (95-102 in).
- Hydraulic pump type: gear-type, engine-driven
- Flow rate: approx. 65-85 L/min (17-22 gpm)
- Maximum operating pressure: approx. 18-20 MPa (2,610-2,900 psi)
- Hydraulic reservoir capacity: approx. 35-50 L (37-53 qt)
- Hydraulic oil type: ISO VG 32 or ISO VG 46
- Lift cylinders: dual heavy-duty double-acting cylinders
- Tilt cylinders: dual cushioning cylinders
- Auxiliary valves: load-sensing proportional spool valves
Optional Hydraulic Attachments:
- Side-shift
- Fork-positioner
- Rotator
- Bale, block, drum clamps
- Push-pull slip-sheet attachments.
| Service Refill Capacities |
- Engine oil: 10-12 L
- Cooling system: 14-18 L
- Transmission: 10-14 L
- Drive axle: 5-6.5 L
- Steer axle: 1-1.5 L
- Hydraulic system: 35-50 L
Mast Types
Available:
- Simplex (1-stage)
- Duplex (2-stage)
- Triplex (3-stage full free-lift)
Lift Heights:
- Simplex: 2.5-3.5 m (98-138 in)
- Duplex: 3.0-4.5 m (118-177 in)
- Triplex: 4.5-6.0 m (177-236 in)
Free Lift: approx. 80-1,000 mm (3-40 in)
Carriage Width: approx. 1,100-1,250 mm (43-49 in)
Fork Specifications:
- Standard lengths: 1,070 mm (42 in) or 1,220 mm (48 in)
- Optional: 914-1,829 mm (36-72 in)
- Fork width: 100-125 mm
- Fork thickness: 40-50 mm
- ITA fork class: Class III or IV.
- Rated load capacity: 4,000 kg (8,818 lb)
- Load center: 500-600 mm (20-24 in)
De-rating conditions include:
- increased lift height
- fork extensions
- hydraulic attachments
- side-shift operation
- off-center loading
- poor ground conditions.
- Lift speed (unladen): approx. 0.45-0.60 m/s
- Lift speed (laden): approx. 0.30-0.45 m/s
- Lowering speed: approx. 110-160 ft/min
- Gradeability (unladen): approx. 20-30%
- Gradeability (laden): approx. 15-22%
- Drawbar pull: approx. 18,000-26,000 N (4,047-5,846 lbf).
- Overall length to fork face: approx. 2.9-3.2 m
(114-126 in)
- Overall width: approx. 1.35-1.45 m (53-57 in)
- Overhead guard height: approx. 2.2-2.3 m (87-91 in)
- Wheelbase: approx. 1.85-1.95 m (73-77 in)
- Ground clearance: approx. 150-180 mm (6-7 in)
- Turning radius: approx. 2.4-2.6 m
- Aisle width (pallet 1000x1200): approx. 4.0-4.3 m
- Max fork height: 2.5-6.0 m
- Free lift: approx. 80-1,000 mm
- Fork lengths: 36-72 in
- Operating weight: approx. 5,800-6,800 kg (12,785-14,991 lb)
- Counterweight mass: approx. 2,600-3,200 kg (5,732-7,055 lb).
250-Hour Service:
- Replace engine oil and filter
- Clean radiator stack
- Lubricate mast rails and steer axle
- Inspect air filter
500-Hour Service:
- Replace transmission fluid
- Clean hydraulic suction strainer
- Inspect axle seals and driveline
1,000-Hour Service:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect hoses, cylinder seals, wiring
2,000-Hour Service:
- Complete driveline inspection
- Steering geometry check
- Mast structural evaluation.
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