Cat DP20N Specifications
The Caterpillar DP20N is a 2.0-ton (2,000 kg / 4,400
lb) class diesel-powered pneumatic-tire forklift engineered for versatile
material-handling tasks across warehouses, fabrication shops, small
manufacturing plants, agricultural facilities, distribution centers, and light
outdoor yards. Compact in size yet highly durable, the DP20N is designed to
provide stable lifting performance, excellent maneuverability in confined
aisles, low fuel consumption, and consistent day-to-day reliability under
moderate industrial workloads.
This DP20N configuration is equipped with the Mitsubishi S4S-DPB 3.3-liter
diesel engine—one of the most trusted industrial engines in the light-to-mid
forklift segment. Known for its mechanical simplicity, strong torque delivery,
smooth operation, and long-service life, the S4S-DPB complements the DP20N’s
compact frame by providing robust low-RPM pulling power and dependable thermal
stability under mixed indoor/outdoor usage. Combined with a reinforced welded
chassis, ergonomic operator station, fully hydrostatic steering, and efficient
hydraulic system, the DP20N delivers predictable load handling, reduced operator
fatigue, and minimized service downtime.
Designed to operate economically in fleet environments, the DP20N emphasizes
easy maintenance access, straightforward diagnostics, durable brake and
drivetrain components, and a balanced chassis that maintains confidence when
maneuvering with loads at low or full lift heights.
The Caterpillar DP20N uses the Mitsubishi S4S-DPB
engine, a proven mechanical-injection 3.3-liter diesel powerplant engineered for
reliability in forklifts, generators, and construction equipment.
Basic Engine Specifications - 3.3L S4S-DPB:
- Engine type: 4-cylinder, 4-stroke, mechanically injected diesel
- Displacement: 3.3 liters (203 cubic inches)
- Bore x stroke: approx. 94 x 107 mm (3.70 x 4.21 in)
- Rated output: approx. 30-38 kW (40-50 hp) at 2,300-2,500 rpm
- Peak torque: approx. 150-175 Nm (111-129 lb-ft) at 1,600-1,800 rpm
- Induction: naturally aspirated
- Fuel system: mechanical inline or rotary pump
- Idle speed: approx. 750 ± 50 rpm
- Emissions category: typically Tier 3 or equivalent depending on region
This engine is designed for fuel economy, longevity, and stable torque under
low-speed forklift duty cycles.
Lubrication System:
- Lubrication type: full-pressure wet-sump
- Pump type: gear-driven trochoid pump
- Oil capacity: approx. 6.5-7.5 L (6.9-7.9 qt)
- Normal oil pressure: approx. 300-400 kPa (44-58 psi)
- Recommended oil: SAE 15W-40 (API CF/CG/CH)
- Oil filter: spin-on full-flow filter
- Crankcase ventilation: closed-breather system
Cooling System:
- Cooling method: liquid-cooled, forced circulation
- Coolant capacity: approx. 7-9 L (7.4-9.5 qt)
- Thermostat opening temperature: approx. 82°C (180°F)
- Radiator: high-capacity fin-tube industrial radiator
- Cooling fan: mechanical, engine-driven
- Water pump: belt-driven centrifugal pump
- System pressure: approx. 90-110 kPa (13-16 psi)
- Coolant mixture: 50/50 ethylene glycol and demineralized water
The cooling system maintains stable thermal behavior under frequent stop-and-go
cycles and outdoor temperature swings.
The DP20N utilizes a compact yet durable industrial
powershift transmission.
Transmission:
- Type: 1-2 speed forward / 1-2 speed reverse powershift
- Travel speed (unladen): approx. 17-19 km/h (10-12 mph)
- Travel speed (laden): approx. 15-17 km/h (9-10 mph)
- Transmission fluid capacity: approx. 6-8 L (6.3-8.4 qt)
- Recommended fluid: Dexron III ATF or approved industrial ATF
- Cooling: integrated cooler using the engine radiator
Drive Axle:
- Type: solid front drive axle
- Differential: bevel-gear differential
- Axle oil capacity: approx. 3.5-5.0 L (3.7-5.3 qt)
- Lubricant: SAE 80W-90 gear oil
Steer Axle:
- Type: oscillating single-pivot rear axle
- Oscillation angle: approx. ±8-10 degrees
- Lubricant capacity: approx. 1.0-1.5 L (1.0-1.6 qt)
Braking System:
- Service brakes: hydraulic drum brakes (dual leading shoes)
- Brake actuation: hydraulic master cylinder
- Parking brake: mechanical hand-lever actuated drum brake
The braking system offers predictable stopping characteristics, long lining
life, and minimal maintenance requirements.
- System voltage: 12 V
- Battery capacity: approx. 70-90 Ah
- Alternator: approx. 40-60 A
- Starter motor: approx. 2.0-2.5 kW
- Electrical harness: sealed connectors and abrasion-resistant conduit
- Dash indicators: oil pressure, coolant temp, glow plug indicator, charging
light, brake warning, hour meter
The electrical system is built for reliability, resisting dust, moisture, and
vibration common in industrial settings.
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2-wheel drive pneumatic-tire forklift
Tire Specifications (Pneumatic):
- Front tires: approx. 6.50-10
- Rear tires: approx. 5.00-8
- Optional tires:
- solid pneumatic for high-debris operations
- non-marking for indoor warehouse floors
Chassis Construction:
- Fully welded steel frame for torsional rigidity
- Integrated counterweight for load stability
- Reinforced overhead guard
- Protected hydraulic and electrical routing
- Anti-slip operator step plates
The chassis design minimizes flex under load and supports stable truck behavior
at height.
Steering:
- 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. 1.9-2.2 m (75-87 in)
Hydrostatic steering ensures low-effort directional control with excellent
maneuverability in tight aisles.
- Hydraulic pump type: engine-driven gear pump
- Pump flow: approx. 35-55 L/min (9-14.5 gpm)
- Maximum hydraulic pressure: approx. 17-19 MPa (2,500-2,750 psi)
- Hydraulic reservoir: approx. 20-28 L (21-30 qt)
- Hydraulic fluid type: ISO VG 32 / VG 46
- Lift cylinders: dual double-acting cylinders
- Tilt cylinders: dual cylinders with cushioning for smooth operation
Optional hydraulic attachments:
- Side-shift
- Fork-positioner
- Rotator
- Drum clamp / Bale clamp
- Push-pull devices
The hydraulic system is optimized for smooth load control and precise placement
at low and full lift heights.
| 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 fluid: 6-8 L (6.3-8.4 qt)
- Drive axle: 3.5-5.0 L (3.7-5.3 qt)
- Steer axle: 1-1.5 L (1.0-1.6 qt)
- Hydraulic system: 20-28 L (21-30 qt).
Mast Types:
- Simplex (1-stage)
- Duplex (2-stage)
- Triplex (3-stage full free-lift)
Lift Heights:
- Simplex: approx. 2.5-3.5 m (98-138 in)
- Duplex: approx. 3.0-4.5 m (118-177 in)
- Triplex: approx. 4.5-6.0 m (177-236 in)
Free Lift: Approx. 80-1,000 mm (3-40 in) depending on mast configuration
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)
- Fork width: approx. 100-125 mm (4-5 in)
- Fork thickness: approx. 35-45 mm (1.4-1.8 in)
- Fork class: ITA Class II.
Rated capacity: 2,000 kg (4,400 lb) at 500-600 mm
(20-24 in) load center
Capacity derating occurs with:
- increased mast height
- attachments installed
- longer forks
- off-center or wide loads
- operation on incline surfaces.
- 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): approx. 110-140 ft/min
- Lowering speed (laden): approx. 130-160 ft/min
- Gradeability (unladen): approx. 20-25%
- Gradeability (laden): approx. 15-20%
- Drawbar pull: approx. 12,000-16,000 N (2,700-3,600 lbf).
- Overall length to fork face: approx. 2.3-2.5 m (91-98
in)
- Overall width: approx. 1.1-1.2 m (43-47 in)
- Overhead guard height: approx. 2.1-2.2 m (83-87 in)
- Wheelbase: approx. 1.5 m (59 in)
- Ground clearance (frame): approx. 100-120 mm (4-5 in)
- Turning radius: approx. 1.9-2.2 m (75-87 in)
- Aisle width (1000x1200 pallet): approx. 3.4-3.7 m (134-146 in)
- Maximum fork height: 2.5-6.0 m depending on mast
- Free lift: 80-1,000 mm
- Fork lengths: 36-72 in typical
- Operating weight: approx. 3,200-3,700 kg (7,050-8,160 lb)
- Counterweight mass: approx. 1,300-1,700 kg (2,866-3,748 lb).
250-Hour:
- Replace engine oil and filter
- Clean radiator fins
- Lubricate mast components and steer axle joints
- Inspect air filter
500-Hour:
- Replace transmission fluid and filter
- Inspect drive axle seals
- Check hydraulic suction screen
1,000-Hour:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect hoses, cylinder seals, and driveline joints
2,000-Hour:
- Full hydraulic system inspection
- Mast structural alignment check
- Steering linkage inspection
- Engine mount and axle mount inspection.
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