Cat DP30N Specifications
The Caterpillar DP30N is a 3.0-ton (3,000 kg / 6,600
lb) diesel-powered pneumatic-tire forklift designed for medium-to-heavy
industrial applications requiring strong torque output, excellent fuel
efficiency, rugged construction, and dependable multi-shift performance. Built
around the proven Mitsubishi S4S industrial diesel engine, the DP30N is well
suited for manufacturing plants, distribution centers, fabrication yards, lumber
operations, ports, steel handling, construction-material facilities, and outdoor
yard operations.
The forklift features a robust welded-steel chassis, heavy-duty powershift
transmission, high-visibility mast architecture, hydrostatic steering, advanced
cooling system, durable pneumatic tires, and a fully counterbalanced frame. Its
S4S engine delivers smooth low-end torque, excellent throttle response, and
reliable cold-start characteristics.
The DP30N emphasizes ease of maintenance,
simplified component access, dependable braking performance, and strong
high-lift stability. Operators benefit from an ergonomic compartment,
clear sight lines, vibration-isolated seating, logical control layout,
and predictable handling.
The Caterpillar DP30N is powered by the Mitsubishi S4S
diesel engine—one of the most widely used industrial diesel engines in the 3-ton
forklift category.
Mitsubishi S4S - Basic Technical
Specifications:
- Engine type: inline 4-cylinder, 4-stroke, naturally aspirated diesel
- Displacement: approx. 3.3 liters (3,331 cc)
- Bore x stroke: approx. 94 x 120 mm (3.70 x 4.72 in)
- Rated output (industrial configuration): approx. 36-44 kW (48-59 hp) @
2,300-2,500 rpm
- Peak torque: approx. 180-210 Nm (133-155 lb-ft) @ 1,600-1,800 rpm
- Combustion system: pre-combustion chamber diesel
- Fuel system: mechanical in-line injection pump
- Aspiration: naturally aspirated
- Idle speed: approx. 750 ± 50 rpm
- Emissions: meets industrial diesel emissions requirements depending on market
The S4S engine is known for long service life, excellent torque output, strong
reliability, and low fuel consumption.
Lubrication System:
- Lubrication type: full-pressure, gear-pump system
- Oil pump: internal gear pump
- Oil capacity: approx. 6.8-7.5 L (7.2-7.9 qt)
- Normal oil pressure: approx. 250-400 kPa (36-58 psi)
- Recommended oil: SAE 10W-30, 15W-40 (API CF/CG/CH diesel specification)
- Filtration: spin-on full-flow oil filter
Cooling System:
- Cooling type: liquid-cooled, radiator-based
- Coolant capacity: approx. 8-10 L (8.4-10.5 qt)
- Thermostat opening temperature: approx. 82°C (180°F)
- Fully open near: 95°C (203°F)
- Cooling fan: engine-driven mechanical fan
- Water pump: belt-driven centrifugal
- Radiator: heavy-duty fin-tube industrial core
- System pressure: approx. 88-108 kPa (13-16 psi)
The cooling system is optimized for heavy-duty, high-temperature work cycles
lasting multiple shifts.
Transmission:
- Type: industrial powershift
- Gear configuration: 1-2 forward / 1-2 reverse
- Direction change: electric-over-hydraulic control
- Travel speed (unladen): approx. 18-20 km/h (11-12 mph)
- Travel speed (laden): approx. 16-18 km/h (10-11 mph)
- Transmission oil capacity: approx. 8-12 L (8.4-12.7 qt)
- Recommended fluid: Dexron III ATF or specified powershift fluid
- Cooling: integrated oil-to-air cooler
Front Drive Axle:
- Type: rigid industrial drive axle
- Differential: bevel-gear differential
- Axle oil capacity: approx. 4.0-5.5 L (4.2-5.8 qt)
- Lubricant: SAE 80W-90 gear oil
Rear Steer Axle:
- Type: oscillating center-pivot axle
- Oscillation angle: approx. ±8-10 degrees
- Lubricant capacity: approx. 1.0-1.5 L
Braking System:
- Service brakes: hydraulic drum brakes (dual leading-shoe)
- Actuation: hydraulic master cylinder with vacuum or hydraulic assist (varies
by region)
- Parking brake: mechanical lever-operated drum brake
- Optional: wet-disc brakes depending on region and specification package
- Operating voltage: 12 V
- Battery capacity: approx. 70-110 Ah
- Alternator output: approx. 40-60 A
- Starter motor: approx. 2.5-3.0 kW
- Wiring: sealed connectors, abrasion-resistant harness, waterproof routing
Instrument panel indicators:
- oil pressure warning
- coolant temperature warning
- charging system
- glow plug indicator
- hour meter
- brake indicator.
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive system: 2-wheel drive
Tires (Pneumatic Standard):
- Front tires: approx. 8.15x15
- Rear tires: approx. 6.50x10
- Optional: solid pneumatic or non-marking compounds
Chassis Structure:
- Fully welded steel frame
- Integrated counterweight
- Reinforced mast channels
- High-strength overhead guard
- Anti-slip step design
- Protected hydraulic and electrical line routing
- Rubber engine mounts for vibration isolation
Steering:
- Type: fully hydrostatic steering
- Steering pump flow: approx. 6-12 L/min (1.5-3.2 gpm)
- Steering cylinder: double-acting
- Rear axle: center-pivot oscillating
- Turning radius: approx. 2.3-2.5 m (91-98 in)
This system ensures precise low-speed control and minimal steering effort.
- Pump type: engine-driven gear pump
- Flow rate: approx. 45-65 L/min (12-17 gpm)
- Maximum operating pressure: approx. 17-19 MPa (2,500-2,750 psi)
- Hydraulic reservoir: approx. 28-35 L (30-37 qt)
- Hydraulic fluid type: ISO VG 32 or ISO VG 46
- Lift cylinders: dual double-acting
- Tilt cylinders: dual cushioning cylinders
- Control valve: load-sensing, proportional industrial valve
Optional Attachments:
- Side-shift
- Fork-positioner
- Rotator
- Bale/drum clamp
- Push-pull.
| Service Refill Capacities |
- Engine oil: 6.8-7.5 L
- Cooling system: 8-10 L
- Transmission: 8-12 L
- Drive axle: 4-5.5 L
- Steer axle: 1-1.5 L
- Hydraulic reservoir: 28-35 L
Mast Types:
- 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. 1,050-1,100 mm (41-43 in)
Fork Specifications:
- Standard length: 1,070 mm (42 in) or 1,220 mm (48 in)
- Optional: 914-1,829 mm (36-72 in)
- Width: 100-125 mm
- Thickness: 35-45 mm
- ITA Class II or Class III depending on carriage type.
- Rated capacity: 3,000 kg (6,600 lb)
- Load center: 500-600 mm (20-24 in)
Capacity reduction occurs with:
- tall mast heights
- long forks
- side-shift or fork-positioner
- off-center loads
- incline operation.
- Lift speed (unladen): approx. 0.45-0.60 m/s
- Lift speed (laden): approx. 0.28-0.45 m/s
- Lowering speed (unladen): 110-140 ft/min
- Lowering speed (laden): 130-160 ft/min
- Gradeability (unladen): approx. 20-27%
- Gradeability (laden): approx. 15-20%
- Drawbar pull: approx. 15,000-22,000 N (3,370-4,950 lbf).
- Overall length to fork face: approx. 2.6-2.8 m
(102-110 in)
- Overall width: approx. 1.15-1.25 m (45-49 in)
- Overhead guard height: approx. 2.1-2.2 m (83-87 in)
- Wheelbase: approx. 1.65-1.70 m (65-67 in)
- Ground clearance: approx. 110-150 mm (4.3-5.9 in)
- Turning radius: approx. 2.3-2.5 m (91-98 in)
- Aisle width (1000x1200 pallet): approx. 3.6-3.9 m (142-154 in)
- Maximum fork height: 2.5-6.0 m depending on mast selection
- Free lift: up to approx. 1,000 mm
- Fork lengths supported: 36-72 in
- Operating weight: approx. 4,200-4,800 kg (9,250-10,580 lb)
- Counterweight mass: approx. 1,900-2,300 kg (4,180-5,070 lb).
250-Hour Service:
- Replace engine oil and filter
- Clean radiator and cooling stack
- Lubricate mast channels and steer axle joints
- Inspect air filter
500-Hour Service:
- Replace transmission fluid
- Inspect axle seals
- Inspect belts and hoses
- Clean hydraulic suction screen
1,000-Hour Service:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect cylinder seals and hydraulic hoses
- Test glow plugs and fuel system
2,000-Hour Service:
- Full drivetrain inspection
- Steering alignment check
- Structural mast inspection.
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