Cat DP35N Specifications
The Caterpillar DP35N is a 3.5-ton (3,500 kg / 7,700
lb) class diesel-powered pneumatic-tire forklift engineered for rugged
industrial applications requiring strong torque delivery, long-duty endurance,
and stable high-capacity load handling. Built on the robust Caterpillar N-Series
chassis platform, the DP35N integrates a reinforced steel frame, heavy-duty mast
assemblies, enhanced cooling capacity, improved operator ergonomics, and
long-life components.
At the heart of the DP35N is the Mitsubishi S4S 3.3-liter naturally aspirated
industrial diesel engine, known for its excellent reliability, fuel efficiency,
low-RPM torque characteristics, and long service life. Combined with
Caterpillar’s industrial powershift transmission, hydrostatic steering, and
load-sensing hydraulic system, the DP35N provides consistent performance in
harsh work cycles such as construction-material handling, lumber yards, steel
fabrication, manufacturing plants, logistics terminals, and outdoor warehouse
environments.
Operators benefit from smooth control modulation, low vibration levels, wide
mast visibility, and a spacious operator compartment. Maintenance staff
appreciate the easy-access service points, wide-opening panels, centralized
filters, and simple mechanical layout. The DP35N is widely regarded for
durability, stability, and dependable lifting performance over long periods of
use.
The Caterpillar DP35N is equipped with the Mitsubishi
S4S industrial diesel engine.
Mitsubishi S4S - Basic Technical
Specifications:
- Engine type: inline 4-cylinder, 4-stroke diesel
- Displacement: approx. 3.3 liters (3,331 cc)
- Bore x stroke: approx. 94 x 120 mm (3.70 x 4.72 in)
- Rated power (industrial): 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: varies by region; meets industrial diesel requirements
The S4S is a durable, proven industrial diesel engine delivering strong low-end
torque and a long service life under heavy forklift duty cycles.
Lubrication System:
- Type: full-pressure lubrication
- Oil pump: internal gear pump
- Oil capacity: approx. 6.8-7.5 L (7.2-7.9 qt)
- Normal operating pressure: approx. 250-400 kPa (36-58 psi)
- Oil grade: SAE 10W-30 or 15W-40 (API CF/CG/CH)
- Filtration: spin-on full-flow oil filter
Cooling System:
- Type: liquid-cooled, thermostatically controlled
- Coolant capacity: approx. 8-10 L (8.4-10.5 qt)
- Thermostat opening: approx. 82°C (180°F)
- Fully open near: 95°C (203°F)
- Radiator: heavy-duty fin-tube industrial cooling core
- Cooling fan: mechanical, engine-driven
- Water pump: belt-driven centrifugal
- Cooling system pressure: approx. 88-108 kPa (13-16 psi).
Transmission:
- Type: industrial powershift
- Gear arrangement: 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)
- Transmission fluid capacity: approx. 8-12 L (8.4-12.7 qt)
- Recommended fluid: Dexron III ATF or dedicated powershift oil
- Cooling: integrated oil cooler
Front Drive Axle:
- Type: rigid industrial axle
- Differential: bevel-gear differential
- Axle oil capacity: approx. 4.0-5.5 L (4.2-5.8 qt)
- Lubricant: SAE 80W-90
Rear Steer Axle:
- Type: center-pivot oscillating axle
- Oscillation: approx. ±8-10 degrees
- Lubricant capacity: approx. 1-1.5 L
Braking System:
- Service brakes: hydraulic dual-leading-shoe drum brakes
- Brake actuation: hydraulic master cylinder with vacuum assist (varies by
region)
- Parking brake: mechanical lever-actuated drum
- Optional: oil-cooled wet-disc brakes depending on configuration.
- System voltage: 12 V
- Battery capacity: approx. 70-110 Ah
- Alternator output: approx. 40-60 A
- Starter motor: approx. 2.5-3.0 kW
- Electrical protection: sealed connectors, routed harness protection
Dash indicators:
- oil pressure
- coolant temperature
- charging indicator
- glow plug indicator
- brake indicator
- hour meter.
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2-wheel drive
Tires (Standard Pneumatic):
- Front tires: approx. 8.15x15
- Rear tires: approx. 6.50x10
- Optional: solid pneumatic or non-marking compounds
Chassis Construction:
- Welded heavy-steel frame
- Integrated counterweight
- Reinforced mast structure
- Overhead guard designed to industrial safety standards
- Rubber engine mounts for vibration reduction
- Protected routing of hydraulic and electrical systems
Steering:
- Steering type: hydrostatic power steering
- Steering pump flow: approx. 6-12 L/min (1.5-3.2 gpm)
- Steering cylinder: double-acting
- Rear steer axle: oscillating pivot design
- Turning radius: approx. 2.4-2.6 m (95-102 in)
The hydrostatic system ensures precise, low-effort steering at low speeds.
- Pump type: engine-driven gear pump
- Flow rate: approx. 45-70 L/min (12-18.5 gpm)
- Max pressure: approx. 17-19 MPa (2,500-2,750 psi)
- Hydraulic reservoir: approx. 30-38 L (32-40 qt)
- Hydraulic fluid: ISO VG 32 or ISO VG 46
- Lift cylinders: dual double-acting
- Tilt cylinders: dual cushioning cylinders
- Hydraulic control valve: load-sensing proportional valve
Optional attachments:
- Side-shift
- Fork-positioner
- Rotator
- Bale/drum clamps
- Push-pull devices.
| 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: 30-38 L
Mast Types:
- 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: Range: approx. 80-1,000 mm (3-40 in)
Carriage Width: Approx. 1,050-1,100 mm (41-43 in)
Fork Specifications:
- Standard fork length: 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: 35-45 mm
- ITA fork class: Class II or III depending on carriage width.
- Rated load capacity: 3,500 kg (7,700 lb)
- Load center: 500-600 mm (20-24 in)
De-rating factors:
- increased lift height
- long forks
- heavy attachments
- side-shift
- off-center loads
- travel on inclines.
- Lift speed (unladen): approx. 0.45-0.60 m/s
- Lift speed (laden): approx. 0.28-0.42 m/s
- Lowering speed (unladen): approx. 110-150 ft/min
- Lowering speed (laden): approx. 130-160 ft/min
- Gradeability (unladen): approx. 20-27%
- Gradeability (laden): approx. 15-20%
- Drawbar pull: approx. 15,000-22,000 N.
- Overall length to fork face: approx. 2.7-2.85 m
(106-112 in)
- Overall width: approx. 1.20-1.25 m (47-49 in)
- Overhead guard height: approx. 2.15-2.25 m (85-89 in)
- Wheelbase: approx. 1.70 m (67 in)
- Ground clearance: approx. 120-150 mm (4.7-5.9 in)
- Turning radius: approx. 2.4-2.6 m (95-102 in)
- Aisle width (1000x1200 pallet): approx. 3.8-4.1 m
- Maximum fork height: 2.5-6.0 m (depending on mast)
- Free lift: up to approx. 1,000 mm
- Fork lengths: 36-72 in
- Operating weight: approx. 4,600-5,200 kg (10,140-11,460 lb)
- Counterweight mass: approx. 2,200-2,700 kg (4,850-5,950 lb).
250-Hour:
- Change engine oil and filter
- Lubricate mast rails and steer axle
- Clean radiator fins
- Inspect air filter
500-Hour:
- Replace transmission oil
- Inspect axle seals
- Clean hydraulic suction strainer
1,000-Hour:
- Replace hydraulic oil and filters
- Replace coolant
- Inspect hoses, cylinder seals, driveline
2,000-Hour:
- Full drivetrain inspection
- Steering geometry inspection
- Mast structural examination.
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