Cat DP45NT Specifications
The Caterpillar DP45NT is a heavy-duty 4.5-ton (4,500
kg / 9,920 lb) diesel pneumatic-tire forklift engineered for rugged industrial
environments requiring strong torque, stable load-handling, high structural
rigidity, and long-term operational reliability. Positioned within Caterpillar’s
NT-Series diesel lineup, the DP45NT thrives in fabrication plants, steel
distribution yards, construction-supply depots, timber-processing operations,
outdoor warehouses, manufacturing facilities, logistics terminals, and
multi-shift heavy lifting environments.
At the heart of the DP45NT is the Mitsubishi S6S industrial diesel engine — a
robust, naturally aspirated 5.0-liter inline-six powerplant renowned for its
superior durability, low operating costs, high torque at low RPM, and long
service life. The forklift integrates a reinforced welded chassis, a heavy-duty
powershift transmission, load-sensing hydraulics, durable drive axles,
hydrostatic steering, and a high-strength mast assembly designed for sustained
heavy-duty use.
The operator environment emphasizes ergonomic
comfort, broad visibility, reduced vibration, and intuitive control
layout. Maintenance access is simplified through grouped service points,
wide-opening panels, and durable, logically routed components.
Mitsubishi S6S -
Technical Specifications:
- Type: inline 6-cylinder, 4-stroke diesel
- Displacement: approx. 4.997 L (4,997 cc)
- Bore x stroke: 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. 300-360 Nm (221-266 lb-ft) @ 1,600-1,800 rpm
- Fuel system: mechanical in-line injection pump
- Aspiration: naturally aspirated
- Combustion: indirect injection (prechamber)
- Idle speed: approx. 750 ± 50 rpm
- Known traits: extremely durable, smooth operation, long overhaul intervals.
Lubrication System:
- Type: full-pressure, wet-sump
- Oil pump: internal gear-type
- Oil capacity: approx. 10-12 L (10.5-12.7 qt)
- Operating pressure: approx. 250-450 kPa (36-65 psi)
- Recommended oil: SAE 10W-30 / 15W-40 diesel (API CF/CG/CH)
- Filter: spin-on, full-flow
- Notes: designed for extended engine life under heavy industrial duty cycles.
Cooling System:
- Cooling type: liquid-cooled
- Total coolant capacity: approx. 16-22 L (17-23 qt)
- Thermostat opening: approx. 82°C (180°F)
- Fully open: approx. 95°C (203°F)
- Radiator: heavy-duty fin-tube high-capacity core
- Water pump: belt-driven centrifugal
- Fan: mechanical engine-driven
- Pressure rating: approx. 88-108 kPa (13-16 psi).
Transmission:
- Type: industrial grade powershift
- Gear configuration: 1-2 forward / 1-2 reverse
- Direction selection: electric-over-hydraulic shuttle
- Unladen travel speed: approx. 18-20 km/h (11-12 mph)
- Laden travel speed: approx. 16-18 km/h (10-11 mph)
- Fluid capacity: approx. 12-16 L (12.7-16.9 qt)
- Recommended fluid: Dexron III ATF or CAT powershift fluid
- Cooling: oil-to-air heat exchanger for extended duty protection
Front Drive Axle:
- Type: reinforced rigid axle
- Differential: bevel-gear industrial differential
- Lubricant capacity: approx. 6-7.5 L (6.3-7.9 qt)
- Lubricant: SAE 80W-90 gear oil
- Notes: heavy-duty bearings for high-load endurance
Rear Steer Axle:
- Type: oscillating center-pivot
- Oscillation: ±8-10 degrees
- Lubrication: approx. 1.0-1.5 L
- Notes: provides stability on uneven surfaces
Braking System:
- Service brakes: hydraulic drum brakes
- Parking brake: mechanical lever-actuated
- Optional system: oil-cooled wet-disc brakes (region dependent).
- System voltage: 12 V
- Battery rating: 100-140 Ah
- Alternator output: approx. 50-80 A
- Starter: approx. 2.5-3.0 kW
- Wiring: abrasion-protected, industrial-grade harness
Indicators:
- engine oil pressure
- coolant temperature
- alternator charge
- glow plug
- parking brake
- hour meter.
Drive and Steering
Layout:
- Drive wheels: front
- Steer wheels: rear
- Drive type: 2WD (pneumatic-tire configuration)
Tires (Standard Pneumatic):
- Front: approx. 8.25-15 or 300-15
- Rear: approx. 7.00-12
- Optional: solid pneumatic / non-marking tires
Chassis Design:
- Fully welded steel frame
- Heavy integrated counterweight
- High-strength overhead guard
- Anti-slip access plates
- Rubber-mounted engine isolation
- Protected hydraulic and electrical routing
Steering:
- Steering type: fully hydrostatic
- Pump flow: approx. 7-15 L/min (1.8-4.0 gpm)
- Steering cylinder: double-acting
- Rear axle: oscillating design
- Turning radius: approx. 2.5-2.8 m (98-110 in).
- Pump type: engine-driven external gear pump
- Hydraulic flow: approx. 75-100 L/min (19.8-26.4 gpm)
- Maximum system pressure: approx. 18-20 MPa (2,610-2,900 psi)
- Reservoir capacity: approx. 40-55 L (42-58 qt)
- Oil type: ISO VG 32 or VG 46
- Lift cylinders: dual double-acting
- Tilt cylinders: dual cushioning
- Valve: proportional or load-sensing spool valve
Supported Hydraulic Attachments:
- Side-shift
- Fork-positioner
- Rotator
- Drum/Bale clamp
- Paper roll clamp
- Push-pull device.
| Service Refill Capacities |
- Engine oil: 10-12 L
- Cooling system: 16-22 L
- Transmission: 12-16 L
- Drive axle: 6-7.5 L
- Steer axle: 1-1.5 L
- Hydraulic tank: 40-55 L
Mast Options:
- Simplex (1-stage)
- Duplex (2-stage)
- Triplex (3-stage full free-lift)
Lift Heights:
- Simplex: 2.5-3.5 m
- Duplex: 3.0-4.5 m
- Triplex: 4.5-6.0 m
Free Lift Capability: 80-1,000 mm
Carriage Width: 1,150-1,300 mm (45-51 in)
Fork Specifications:
- Standard: 1,070 mm (42 in) or 1,220 mm (48 in)
- Optional lengths: 914-1,829 mm (36-72 in)
- Fork width: 100-125 mm
- Fork thickness: 45-55 mm
- ITA fork class: Class III or Class IV.
- Rated lifting capacity: 4,500 kg (9,920 lb)
- Standard load center: 500-600 mm (20-24 in)
Derating factors:
- high mast heights
- heavy attachments
- fork extensions
- side-shift use
- off-center or uneven loads
- work on inclines or rough surfaces.
- Lift speed (unladen): approx. 0.45-0.60 m/s
- Lift speed (laden): approx. 0.28-0.45 m/s
- Lowering speed: approx. 110-170 ft/min
- Gradeability (unladen): 20-30%
- Gradeability (laden): 15-22%
- Drawbar pull: approx. 20,000-28,000 N (4,495-6,295 lbf)
- Length to fork face: approx. 3.0-3.2 m (118-126 in)
- Overall width: approx. 1.40-1.55 m (55-61 in)
- Overhead guard height: approx. 2.2-2.3 m (87-91 in)
- Wheelbase: approx. 1.9-2.1 m (75-83 in)
- Ground clearance: approx. 150-190 mm (6-7.5 in)
- Turning radius: 2.5-2.8 m
- Aisle width (pallet 1000x1200): 4.0-4.4 m
- Maximum fork height: 2.5-6.0 m
- Free lift: 80-1,000 mm
- Fork lengths: 36-72 in
- Operating weight: approx. 6,300-7,400 kg (13,889-16,314 lb)
- Counterweight mass: approx. 3,000-3,600 kg (6,600-7,935 lb)
250-hour interval:
- Replace engine oil and filter
- Clean radiator stack
- Lubricate mast rails and steer axle
- Inspect air filter
500-hour interval:
- Replace transmission fluid
- Inspect driveline components
- Clean hydraulic suction screen
1,000-hour interval:
- Replace hydraulic fluid and filters
- Replace coolant
- Inspect hoses, cylinders, electrical harness
2,000-hour interval:
- Full drivetrain inspection
- Steering alignment check
- Mast structural integrity verification.
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