Clark DPM25 Specifications
The Clark DPM25 is a compact diesel-powered
pneumatic-tire forklift engineered for industrial environments requiring
dependable outdoor performance, efficient fuel consumption, balanced load
handling, and long-term mechanical durability.
With a nominal lifting capacity of
approximately 2,500 kg (5,500 lb), the DPM25 is primarily used in
construction-material yards, agricultural processing facilities, lumber
operations, manufacturing plants, steel-handling warehouses, logistics
centers, and outdoor distribution applications. The truck combines a
rugged diesel powertrain, a stable counterbalanced chassis, reinforced
mast structure, and high-traction pneumatic tires suitable for uneven
terrain and mixed surface conditions.
The DPM25 is designed for durability, operator comfort, and service
simplicity. Its open engine compartment allows easy access to filters,
belts, hoses, and major service points. Operators benefit from strong
low-rpm torque, predictable steering behavior, wide step-in area,
ergonomic controls, clear mast visibility, and reduced vibration
transmission.
Maintenance technicians appreciate the logical
hydraulic routing, heavy-duty drivetrain components, sealed electrical
connectors, long service intervals, and proven reliability of its
industrial diesel engine. The combination of comfort, strength, and
mechanical simplicity gives the DPM25 a long service life with minimal
downtime.
The Clark DPM25 typically incorporates industrial
diesel engines such as the Isuzu 4JB1 family, Yanmar 4TNE series, or Mitsubishi
S4S-D engines depending on production year, emissions requirements, and region.
These engines feature strong torque delivery at low rpm, conservative fuel use,
long component life, and stable outdoor performance.
Isuzu 4JB1 Industrial Diesel:
- Configuration: inline 4-cylinder, 4-stroke diesel
- Displacement: approx. 2.8 L
- Power output: approx. 40-50 kW (54-67 hp)
- Peak torque: approx. 150-185 Nm (111-136 lb-ft)
- Rated speed: approx. 2,400-2,600 rpm
- Idle speed: approx. 800-900 rpm
- Fuel system: mechanical injection pump with multi-stage filtration
Yanmar 4TNE94 / 4TNE98 Diesel:
- Displacement: approx. 3.0-3.3 L
- Output: approx. 44-50 kW (59-67 hp)
- Torque: approx. 200-230 Nm (148-170 lb-ft)
Mitsubishi S4S-D:
- Output range: approx. 40-55 kW (54-74 hp)
- Strong mid-rpm torque suitable for forklift duty cycles
Engine Construction:
- Heavy cast-iron block
- Cast-iron cylinder head with high-strength valves
- Forged crankshaft with multiple main bearings
- Aluminum pistons with oil-cooling underside
- Heat-treated connecting rods
- Industrial-grade camshaft and valvetrain
Fuel System:
- Mechanical injection system
- High-efficiency air cleaner with replaceable element
- Water-separating fuel filter + fine particulate filter
- Fuel lift pump integrated into system
Lubrication System:
- Full-pressure wet-sump lubrication
- Gear-driven oil pump
- Oil capacity: approx. 6-8 L (6.3-8.4 qt)
- Normal oil pressure: approx. 300-450 kPa (44-65 psi)
- Recommended oil: SAE 15W-40
- Replaceable spin-on full-flow oil filter
Cooling System:
- Liquid cooling with belt-driven water pump
- Coolant capacity: approx. 8-12 L (8.4-12.7 qt)
- Thermostat opening temperature: approx. 82°C (180°F)
- Heavy-duty industrial radiator with protective metal shroud
- System pressure: approx. 13 psi (90 kPa)
The DPM25 uses a compact industrial powershift
transmission designed for frequent forward-reverse cycles and outdoor terrain.
Transmission:
- Type: torque-converter powershift
- Gear selection: forward, reverse, neutral
- Forward travel speed (unladen): approx. 18-20 km/h (11-12.5 mph)
- Reverse speed: approx. 15-18 km/h (9-11 mph)
- Fluid capacity: approx. 6-9 L (6.3-9.5 qt)
- Recommended fluid: ATF Dexron III or Clark-approved ATF
- Direction control: steering-column lever actuating hydraulic clutch packs
Drive Axle:
- Cast-steel differential housing
- Planetary final-reduction hubs
- Axle oil capacity: approx. 4-6 L (4.2-6.3 qt)
- Lubricant: SAE 80W-90 or 85W-140
Brake System:
- Service brakes: hydraulic drum brakes (standard) or optional wet-disc brakes
- Parking brake: mechanical lever-activated drum brake
- Brake tuning: optimized for mixed outdoor surfaces and light slopes
- Electrical system voltage: 12 V
- Battery capacity: approx. 70-90 Ah
- Alternator output: approx. 40-70 A
- Starter motor rating: approx. 1.4-2.0 kW
- Safety switches: operator-presence switch, neutral-start interlock
- Lighting system: headlights, rear lamps, optional work lamps
- Harness: abrasion-resistant industrial wiring with protective conduit
Drive
Configuration:
- Front-wheel drive
- Rear-wheel steering
- Pneumatic-tire configuration for outdoor surfaces
Tire Specifications (Pneumatic):
- Front tires: approx. 28x9-15
- Rear tires: approx. 6.50x10
Optional Tire Packages:
- Solid pneumatic tires for debris-prone yards
- Lug-type tires for loose gravel or rough surfaces
- Non-marking tires for mixed indoor/outdoor facilities
Chassis Construction:
- Fully welded high-strength steel frame
- Reinforced mast base with heavy-plate supports
- Counterweight integrated into rear frame mass
- Under-chassis protection for hydraulic lines and electrical harness
Steering:
- Type: fully hydrostatic power steering
- Steering pump flow: approx. 8-12 L/min (2.1-3.2 gpm)
- Rear-axle design: oscillating axle with heavy-duty pivot bushings
- Turning radius: approx. 2.0-2.3 m (79-91 in)
- Steering behavior: stable and predictable under load or uneven terrain
- Max hydraulic pressure: approx. 2,200-2,400 psi
(152-165 bar)
- Pump type: engine-driven external gear pump
- Pump flow: approx. 30-45 L/min (8-12 gpm)
- Hydraulic reservoir: approx. 20-25 L (21-26 qt)
- Fluid type: ISO VG 32 or ISO VG 46
- Lift cylinders: twin double-acting cylinders
- Tilt cylinders: dual cylinders with cushioning and load-hold check valves
- Optional auxiliary functions: sideshift, fork-positioner, clamp attachments
| Service Refill Capacities |
- Engine oil: approx. 6-8 L (6.3-8.4 qt)
- Cooling system: approx. 8-12 L (8.4-12.7 qt)
- Transmission: approx. 6-9 L (6.3-9.5 qt)
- Drive axle: approx. 4-6 L (4.2-6.3 qt)
- Hydraulic oil: approx. 20-25 L (21-26 qt)
Mast Types:
- Two-stage (V mast)
- Three-stage full free-lift (FV mast)
Lift Height Options:
- V mast: approx. 2.5-3.5 m (98-138 in)
- FV mast: approx. 4.0-5.5 m (157-216 in)
Free Lift:
- Approx. 0.1-0.8 m (4-31 in) depending on mast
Fork Specifications:
- Standard fork length: 914-1,067 mm (36-42 in)
- Optional forks: 1,067-1,219 mm (42-48 in)
- Fork width: approx. 100-125 mm (4-5 in)
- Fork thickness: approx. 35-45 mm (1.4-1.8 in)
- Rated load: 2,500 kg (5,000-5,500 lb) at 600 mm (24
in) load center
De-rating influenced by:
- increased lift heights
- long fork options
- heavy attachments
- off-center loads
- sloping or uneven terrain
- Lift speed (unladen): approx. 0.40-0.50 m/s (80-100
ft/min)
- Lift speed (laden): approx. 0.25-0.30 m/s (50-60 ft/min)
- Lowering speed (unladen): approx. 90-120 ft/min
- Lowering speed (laden): approx. 110-140 ft/min
- Travel speed (unladen): approx. 18-20 km/h (11-12.5 mph)
- Travel speed (laden): approx. 14-16 km/h (9-10 mph)
- Gradeability (unladen): approx. 20-25%
- Gradeability (laden): approx. 12-15%
- Drawbar pull: approx. 10,000-15,000 N (2,248-3,370 lbf)
- Overall length to fork face: approx. 2.5-2.7 m
(98-106 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. 1.55-1.70 m (61-67 in)
- Ground clearance: approx. 110-130 mm (4.3-5.1 in)
- Turning radius: approx. 2.0-2.3 m (79-91 in)
- Aisle width (1000x1200 pallet): approx. 3.7-4.0 m (146-157 in)
- Maximum fork height: 2.5-5.5 m depending on mast
- Free lift: 0.1-0.8 m
- Fork lengths: 36-48 in
- Operating weight: approx. 3,800-4,500 kg (8,378-9,920 lb)
- Counterweight mass: approx. 1,200-1,700 kg (2,645-3,748 lb)
250-Hour
Maintenance:
- Replace engine oil and filter
- Lubricate mast pivots and steering joints
- Clean radiator and air cleaner
- Inspect battery terminals
500-Hour Maintenance:
- Replace fuel filter
- Inspect driveline components
- Check brake drums/shoes or wet-disc units
- Inspect axle seals
1,000-Hour Maintenance:
- Replace transmission fluid
- Replace axle lubricant
- Inspect hydraulic cylinders
- Check chain stretch and mast alignment
2,000-Hour Maintenance:
- Replace hydraulic oil
- Replace coolant
- Perform complete mast structural inspection
- Test safety interlocks and operator presence circuits
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