Cat DP40N1 Specifications
The Caterpillar DP40N1 is a heavy-duty 4.0-ton (4,000
kg / 8,818 lb) diesel-powered pneumatic-tire forklift engineered for demanding
multi-shift industrial operations requiring strong torque, durable powertrain
components, excellent cooling capacity, and long-term structural reliability. As
part of Caterpillar’s N1-Series internal-combustion lineup, the DP40N1 is built
for manufacturing plants, steel fabrication yards, timber and lumber processing
facilities, port operations, outdoor distribution centers, concrete-product
yards, and heavy logistics terminals.
The DP40N1 is available with two proven industrial diesel engines: the
Mitsubishi S6S naturally aspirated 4.7-liter engine and the Perkins 854F
electronically controlled turbocharged 3.4-liter engine. Both engines deliver
dependable torque output and excellent durability under high-load cycles, but
the S6S favors mechanical simplicity and long service life, while the Perkins
854F offers improved fuel efficiency and lower emissions.
The DP40N1 integrates a reinforced steel chassis, heavy-duty powershift
transmission, hydrostatic steering, high-visibility mast structure, industrial
cooling system, and ergonomic operator compartment. Maintenance is simplified
through wide-opening engine covers, centralized filters, accessible lubrication
points, durable wiring protection, and long service intervals. The DP40N1 excels
in applications where consistent heavy lifting, rugged outdoor reliability, and
low operating cost are required.
The DP40N1 supports
two industrial diesel powerplants:
- Mitsubishi S6S - Naturally aspirated 4.7 L diesel
- Perkins 854F - Turbocharged 3.4 L electronically controlled diesel
Mitsubishi S6S - Technical Specifications
- Engine type: inline 6-cylinder, 4-stroke, diesel
- Displacement: approx. 4.7 L (4,725 cc)
- Bore x stroke: approx. 94 x 120 mm (3.70 x 4.72 in)
- Rated output: approx. 60-70 kW (80-94 hp) @ 2,300-2,500 rpm
- Peak torque: approx. 260-310 Nm (192-229 lb-ft) @ 1,600-1,800 rpm
- Combustion system: swirl-chamber diesel
- Fuel system: mechanical injection pump
- Aspiration: naturally aspirated
- Idle speed: approx. 750 ± 50 rpm
- Known for: long engine life, robust mechanical simplicity, low fuel
consumption
Perkins 854F - Technical Specifications
- Engine type: inline 4-cylinder, 4-stroke turbocharged diesel
- Displacement: approx. 3.4 L (3,403 cc)
- Bore x stroke: approx. 99 x 110 mm (3.90 x 4.33 in)
- Rated output: approx. 55-63 kW (74-84 hp) @ 2,200-2,500 rpm
- Peak torque: approx. 270-300 Nm (199-221 lb-ft) @ 1,400-1,600 rpm
- Aspiration: turbocharged
- Fuel system: high-pressure common-rail
- Emissions: Tier IIIA/Tier 4i depending on configuration
- Known for: high fuel efficiency, low emissions, strong low-RPM torque
Lubrication System (Both Engines):
- Type: full-pressure wet-sump
- Oil pump: gear-type
- Oil capacity: approx. 7-10 L (7.4-10.5 qt)
- Normal pressure: approx. 250-450 kPa (36-65 psi)
- Oil grade: SAE 10W-30 or 15W-40 (diesel)
- Filtration: spin-on full-flow filter
Cooling System (Both Engines):
- Cooling method: water-cooled
- System capacity: approx. 12-16 L (12.7-17 qt)
- Thermostat: begins opening at approx. 82°C (180°F)
- Fully open: approx. 95°C (203°F)
- Radiator: heavy-duty fin-tube industrial type
- Cooling fan: mechanical engine-driven
- Water pump: belt-driven centrifugal
- System pressure: approx. 100-120 kPa (15-17 psi).
Transmission:
- Type: industrial heavy-duty powershift
- Gear selection: 1-2 forward / 1-2 reverse
- Direction change: electric-over-hydraulic
- Travel speed (unladen): approx. 18-20 km/h (11-12 mph)
- Travel speed (laden): approx. 16-18 km/h (10-11 mph)
- Oil capacity: approx. 10-14 L (10.5-14.8 qt)
- Recommended fluid: Dexron III ATF or specified PTO fluid
- Cooling: oil-to-air cooler integrated with radiator
Front Drive Axle:
- Type: rigid steel industrial axle
- Differential: bevel-gear type
- Capacity: approx. 5-6.5 L (5.3-6.9 qt)
- Lubricant: SAE 80W-90 gear oil
Rear Steer Axle:
- Type: oscillating center-pivot axle
- Oscillation: approx. ±8-10 degrees
- Capacity: approx. 1-1.5 L
Braking System:
- Service brakes: hydraulic drum (dual leading shoe)
- Optional: wet-disc brakes depending on region
- Parking brake: mechanical lever-operated drum 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 protection: sealed connectors, covered harnessing
Operator panel indicators include:
- oil pressure
- coolant temperature
- glow plug / preheat
- charging lamp
- hour meter
- parking brake indicator.
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2-wheel drive
Tire Specifications (Pneumatic Standard):
- Front tires: approx. 8.25x15
- Rear tires: approx. 7.00x12
- Optional: solid pneumatic, non-marking variants
Chassis Structure:
- Heavy welded-steel frame
- High-mass integrated counterweight
- Reinforced overhead guard
- Anti-slip steps and grab handles
- Rubber engine-mount isolation
- Protected hydraulic and electrical routing
Steering:
- Steering system: fully hydrostatic
- Pump flow: approx. 6-14 L/min (1.5-3.7 gpm)
- Steering cylinder: double-acting
- Rear axle: oscillating center-pivot
- Turning radius: approx. 2.4-2.6 m (95-102 in).
- Pump type: engine-driven gear pump
- Flow rate: approx. 60-80 L/min (15.8-21.1 gpm)
- Maximum operating pressure: approx. 18-20 MPa (2,610-2,900 psi)
- Hydraulic reservoir: approx. 35-45 L (37-47 qt)
- Hydraulic oil: ISO VG 32 or ISO VG 46
- Lift cylinders: dual double-acting
- Tilt cylinders: dual cushioning cylinders
- Control valve: load-sensing proportional valve
Optional Attachments:
- Side-shift
- Fork-positioner
- Rotator
- Bale / drum / block clamps
- Push-pull slip-sheet attachments.
| Service Refill Capacities |
- Engine oil: 7-10 L
- Cooling system: 12-16 L
- Transmission: 10-14 L
- Drive axle: 5-6.5 L
- Steer axle: 1-1.5 L
- Hydraulic system: 35-45 L
Mast Types:
- Simplex (1-stage)
- Duplex (2-stage)
- Triplex (3-stage full free-lift)
Lift Heights:
- Simplex: approx. 2.5-3.5 m
- Duplex: approx. 3.0-4.5 m
- Triplex: approx. 4.5-6.0 m
Free Lift: approx. 80-1,000 mm (3-40 in)
Carriage Width: approx. 1,100-1,250 mm (43-49 in)
Fork Specifications:
- Standard fork 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
- Fork class: ITA Class III or IV.
- Rated capacity: 4,000 kg (8,818 lb)
- Load center: 500-600 mm (20-24 in)
De-rating factors:
- mast height
- long forks
- attachments
- side-shift use
- off-center or wide loads
- uneven surfaces.
- 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. 2.9-3.1 m
(114-122 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 (1000x1200 pallet): approx. 4.0-4.2 m
- Maximum fork height: 2.5-6.0 m
- Free lift: approx. 80-1,000 mm
- Fork lengths: 36-72 in
- Operating weight: approx. 5,600-6,500 kg (12,345-14,330 lb)
- Counterweight mass: approx. 2,600-3,200 kg (5,732-7,055 lb).
250-Hour Interval:
- Replace engine oil and filter
- Clean radiator stack
- Lubricate mast and steer axle fittings
- Inspect air filter
500-Hour Interval:
- Replace transmission oil
- Inspect driveline and axle seals
- Clean hydraulic suction screen
1,000-Hour Interval:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect hoses, cylinder seals, wiring
2,000-Hour Interval:
- Complete driveline inspection
- Steering geometry evaluation
- Mast structural alignment check.
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