Cat DP25N Specifications
The Caterpillar DP25N is a 2.5-ton (2,500 kg / 5,500
lb) diesel-powered pneumatic-tire industrial forklift engineered for a broad
spectrum of indoor-outdoor material-handling operations. Designed for
warehouses, fabrication shops, construction-material yards, manufacturing
facilities, distribution centers, and freight terminals, the DP25N offers
exceptional reliability, smooth hydraulic performance, stable chassis behavior,
and efficient fuel consumption.
Equipped with the robust Mitsubishi-built
3.3-liter S4S-DPB diesel engine, the DP25N provides high low-end torque,
durable mechanical construction, and ease of service access, making it a
preferred unit for mixed-environment fleets requiring long operating
hours and consistent uptime.
The DP25N combines a heavy-duty welded steel frame, advanced mast
visibility, ergonomic operator environment, hydrostatic steering, wet or
drum brake options, and a compact wheelbase for superior
maneuverability. Its design balances power, stability, and simplicity
while delivering long-life performance under frequent load cycles,
uneven surfaces, and outdoor yard conditions.
Technicians value the accessible service
points, modular drivetrain layout, extended maintenance intervals, and
rugged component design. The DP25N is built to withstand demanding
multi-shift schedules with predictable behavior and low total cost of
ownership.
The Caterpillar DP25N is powered by the Mitsubishi
S4S-DPB engine, a 3.3-liter industrial diesel engine known for durability,
smooth operation, and strong torque in low-to-mid RPM ranges.
Basic Engine Specifications - 3.3L
Mitsubishi S4S-DPB:
- Engine type: inline 4-cylinder, 4-stroke diesel
- Displacement: 3.3 liters (203 cubic inches)
- Bore x stroke: approx. 94 x 107 mm (3.70 x 4.21 in)
- Maximum power: approx. 34-38 kW (46-51 hp) @ 2,300-2,500 rpm
- Peak torque: approx. 160-180 Nm (118-133 lb-ft) @ 1,600-1,800 rpm
- Fuel system: mechanically controlled in-line or rotary injection pump
- Aspiration: naturally aspirated
- Emissions rating: typically Tier 3 or equivalent non-EPA for global markets
- Cooling method: liquid-cooled, thermostat-controlled
- Idle speed: approx. 750 ± 50 rpm
The S4S-DPB is well known for reliability in forklifts and generators, offering
a long service life supported by simple mechanical systems.
Lubrication System:
- System type: full-pressure, wet-sump
- Oil pump: gear-driven trochoid pump
- Oil capacity: approx. 6.5-7.5 liters (6.9-7.9 qt) with filter
- Oil pressure: approx. 300-400 kPa (44-58 psi) at rated speed
- Oil type: SAE 15W-40 diesel oil (API CF/CG/CH)
- Filter: spin-on full-flow cartridge
- Crankcase ventilation: closed-breather system
Cooling System:
- Cooling capacity: approx. 7-9 liters (7.4-9.5 qt)
- Water pump: belt-driven centrifugal pump
- Radiator: industrial fin-tube radiator with debris-resistant core
- Thermostat: begins opening at approx. 82°C (180°F)
- Fan: mechanical, engine-driven
- System pressure: approx. 88-108 kPa (13-16 psi)
- Coolant mixture: 50/50 ethylene glycol and demineralized water
The cooling system ensures steady temperature under constant stop-and-go
operation.
Transmission:
- Type: industrial powershift
- Forward speeds: 1-2 (model dependent)
- Reverse speeds: 1-2
- Travel speed unladen: approx. 18-20 km/h (11-12.5 mph)
- Travel speed laden: approx. 16-18 km/h (10-11 mph)
- Transmission fluid capacity: approx. 8-10 liters (8.4-10.5 qt)
- Recommended fluid: Dexron III ATF or equivalent
- Cooling method: oil cooler integrated with radiator
Front Drive Axle:
- Type: solid industrial axle
- Differential: bevel-gear
- Lubrication capacity: approx. 4.0-5.0 liters (4.2-5.3 qt)
- Lubricant: SAE 80W-90 gear oil
Rear Steer Axle:
- Type: oscillating single-pivot steering axle
- Oscillation angle: approx. ±8-10 degrees
- Lubricant capacity: approx. 1.0-1.5 liters (1.0-1.6 qt)
Braking System:
- Service brakes: hydraulic drum brakes (dual leading shoe)
- Brake actuator: hydraulic master cylinder
- Parking brake: mechanical hand-lever actuated drum.
- System voltage: 12 V
- Battery capacity: approx. 70-90 Ah
- Alternator output: approx. 40-60 A
- Starter motor: approx. 2.0-2.5 kW
- Wiring: sealed connectors and harness protection conduits
- Dash indicators: oil pressure, coolant temp, glow plug, charging, brake
indicator, hour meter.
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2-wheel drive pneumatic-tire forklift
Tire Types (Pneumatic):
- Front tires: approx. 7.00x12
- Rear tires: approx. 6.00x9
- Optional: solid pneumatic tires, non-marking compounds
Chassis:
- Fully welded steel frame
- Integrated counterweight for optimal stability
- Anti-slip steps, grab handles
- Protected hydraulic routing
- Reinforced overhead guard
Steering:
- Type: fully hydrostatic power steering
- Steering pump flow: approx. 6-10 L/min (1.5-2.6 gpm)
- Steering cylinder: double-acting cylinder on steer axle
- Turning radius: approx. 2.1-2.4 m (83-95 in)
The hydrostatic steering system provides light steering effort and precise
control in confined aisles.
- Pump type: engine-driven gear pump
- Pump flow: approx. 40-60 L/min (10-15.8 gpm)
- Maximum pressure: approx. 17-19 MPa (2,500-2,750 psi)
- Hydraulic reservoir capacity: approx. 25-30 L (26-32 qt)
- Fluid type: ISO VG 32 or ISO VG 46 hydraulic oil
- Lift cylinders: dual double-acting cylinders
- Tilt cylinders: dual cushioning cylinders
Optional Hydraulic Attachments:
- Side-shift
- Fork-positioner
- Rotator
- Clamp attachments (carton, drum, bale).
| Service Refill Capacities |
- Engine oil: 6.5-7.5 L (6.9-7.9 qt)
- Cooling system: 7-9 L (7.4-9.5 qt)
- Transmission: 8-10 L (8.4-10.5 qt)
- Drive axle: 4-5 L (4.2-5.3 qt)
- Steering axle: approx. 1-1.5 L (1.0-1.6 qt)
- Hydraulic reservoir: 25-30 L (26-32 qt).
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: 80-1,000 mm (3-40 in) depending on mast option
Carriage Width: Approx. 900-1,000 mm (35-39 in).
Fork Specifications:
- Standard fork length: 1,070 mm (42 in) or 1,220 mm (48 in)
- Optional fork lengths: 914-1,829 mm (36-72 in)
- Width: 100-125 mm (4-5 in)
- Thickness: 35-45 mm (1.4-1.8 in)
- Fork class: ITA Class II.
Rated capacity: 2,500 kg (5,500 lb) at 500-600 mm
(20-24 in) load center
De-rating due to:
- increased mast height
- fork length
- mast tilt angle
- attachment usage
- wide or off-center loads.
- Lift speed (unladen): approx. 0.45-0.55 m/s (90-110
ft/min)
- Lift speed (laden): approx. 0.30-0.40 m/s (60-80 ft/min)
- Lowering speed (unladen): 110-140 ft/min
- Lowering speed (laden): 130-160 ft/min
- Gradeability (unladen): approx. 20-25%
- Gradeability (laden): approx. 15-20%
- Drawbar pull: approx. 13,000-18,000 N (2,900-4,000 lbf).
- Overall length to fork face: approx. 2.4-2.6 m
(94-102 in)
- Overall width: approx. 1.15-1.20 m (45-47 in)
- Overhead guard height: approx. 2.1-2.2 m (83-87 in)
- Wheelbase: approx. 1.55 m (61 in)
- Ground clearance: approx. 110-130 mm (4.3-5.1 in)
- Turning radius: approx. 2.1-2.4 m (83-95 in)
- Aisle width (pallet 1000x1200): approx. 3.5-3.8 m (138-150 in)
- Maximum fork height: 2.5-6.0 m depending on mast
- Free lift: 80-1,000 mm
- Fork lengths: 36-72 in
- Operating weight: approx. 3,500-4,000 kg (7,700-8,800 lb)
- Counterweight mass: approx. 1,500-1,900 kg (3,300-4,200 lb).
250-Hour:
- Replace engine oil and filter
- Clean radiator
- Lubricate mast and steer joints
500-Hour:
- Replace transmission fluid
- Inspect drive axle seals
- Inspect hydraulic suction screen
1,000-Hour:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect cylinder seals and hoses
2,000-Hour:
- Drivetrain inspection
- Steering alignment
- Complete mast structural inspection.
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