Clark GPX25E Specifications
The Clark GPX25E is a mid-capacity pneumatic-tire
internal-combustion forklift designed for mixed indoor-outdoor industrial
environments requiring reliable traction, refined load control, and consistent
daily performance. With a nominal lifting capacity of 2,500 kg (5,000 lb), the
GPX25E occupies a central position in Clark’s GPX pneumatic-tire series and is
widely used in warehouse yards, fabrication plants, freight terminals,
construction-material handling, industrial supply depots, and multi-surface work
zones.
Its pneumatic-tire configuration provides
improved shock absorption and terrain adaptability compared to
cushion-tire models, making it well-suited for cracked pavement, uneven
concrete, and partially unpaved industrial areas.
The GPX25E platform incorporates a reinforced steel chassis, a
high-strength mast structure, and a heavy-duty driveline optimized for
repetitive lifting cycles. Its pneumatic-tire suspension characteristics
help reduce transmitted vibration, improving operator comfort while
reducing component stress.
The operator station emphasizes clear forward
visibility, stable ergonomic posture, and intuitive control placement to
support long-shift productivity. Technicians benefit from simplified
hydraulic layout, wide-access engine panels, and extended-life
components designed for reduced downtime.
The Clark GPX25E is commonly equipped with one of two
industrial internal-combustion engines: the Waukesha 2.9-liter LPG/Gasoline
engine or the Continental TM27 2.7-liter LPG/Gasoline engine. Both engines
deliver smooth, controlled torque output at low RPM, ideal for load handling,
and are designed for long-term mechanical durability.
Engine Option (Waukesha 2.9L LPG/Gasoline):
- Configuration: inline 4-cylinder, 4-stroke OHV industrial engine
- Displacement: approx. 2.9 L
- Power output: approx. 45-60 kW (60-80 hp)
- Peak torque: approx. 140-165 lb-ft (190-224 Nm)
- Rated speed: approx. 2,500-2,700 rpm
- Idle speed: approx. 750-850 rpm
- Fuel type: LPG or gasoline
- Fuel system: mixer-type vapor induction or gasoline carburetor
Engine Option (Continental TM27 2.7L
LPG/Gasoline):
- Displacement: approx. 2.7 L
- Power output: approx. 45-55 kW (60-74 hp)
- Peak torque: approx. 135-155 lb-ft (183-210 Nm)
- Governed speed: approx. 2,600-2,800 rpm
- Idle speed: approx. 750-850 rpm
- Fuel type: LPG or gasoline
- Fuel system: mixer-regulated LPG delivery
Engine Construction:
- Cast-iron deep-ribbed block for strength
- Reinforced cast-iron head with heat-resistant valves
- Forged-steel multi-bearing crankshaft
- Aluminum pistons with oil-cooled undersides
- Heavy-duty connecting rods for extended load cycles
Fuel System:
- Mixer-regulated vapor fuel induction (LPG models)
- Carbureted gasoline variants
- Multi-stage fuel filtration with sediment and moisture separation
- Fuel lock-off solenoid for operational safety
Lubrication System:
- Full-pressure wet-sump lubrication
- Crankshaft-driven gear-type oil pump
- Oil capacity: approx. 4.0-5.0 L (4.2-5.3 qt)
- Oil pressure: approx. 200-380 kPa (29-55 psi)
- Oil type: SAE 10W-30 or 15W-40 industrial-grade oil
- Spin-on full-flow oil filter
Cooling System:
- Liquid-cooled system with centrifugal water pump
- High-capacity multi-row radiator
- Coolant capacity: approx. 7-8 L (7.4-8.4 qt)
- Thermostat opening: approx. 82°C (180°F)
- Cooling system pressure: approx. 13-15 psi (90-103 kPa)
The GPX25E utilizes a torque-converter powershift
transmission engineered for frequent directional transitions and controlled
torque delivery.
Transmission:
- Type: torque-converter powershift
- Speeds: forward and reverse; single-speed or two-speed depending on model
- Forward speed (unladen): approx. 16-18 km/h (10-11 mph)
- Reverse speed: approx. 14-16 km/h (9-10 mph)
- Fluid capacity: approx. 6-7 L (6.3-7.4 qt)
- Recommended fluid: Dexron III or Clark-approved ATF
- Direction change: lever-actuated hydraulic clutch packs
Drive Axle:
- Heavy cast-steel differential housing
- Planetary reduction wheel hubs
- Axle lubricant capacity: approx. 4-5 L (4.2-5.3 qt)
- Lubricant type: SAE 80W-90 or 85W-140 gear oil
Brake System:
- Oil-immersed wet-disc brakes (standard)
- Parking brake: mechanical lever-actuated system
- Wet-disc design ensures long service life and resistance to dust contamination
- System voltage: 12 V
- Battery capacity: approx. 80-100 Ah
- Alternator output: approx. 55-75 A
- Starter motor: approx. 1.7-2.5 kW
- Electrical harness: industrial-grade insulated wiring
- Safety protection: operator-presence switch, neutral-start interlock, LPG
lock-off
- Lighting: headlights, tail lamps, and optional roof work lights or flashing
beacon
Drive System:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2WD pneumatic-tire configuration for mixed-terrain operation
Tire Specifications (Pneumatic):
- Front tires: approx. 28x9-15 pneumatic
- Rear tires: approx. 6.50x10 pneumatic
Optional Tires:
- Solid pneumatic for debris-heavy environments
- Aggressive-tread outdoor patterns
- Non-marking materials for indoor specialty applications
Chassis Structure:
- Fully welded steel frame with reinforced mast base
- Heavy-gauge cross-members for durability
- Low center of gravity for load stability
- Protected hydraulic and electrical routing
Steering:
- Fully hydrostatic steering system
- Steering pump flow: approx. 10-13 L/min (2.6-3.4 gpm)
- Oscillating steer axle with heavy pivot bearings
- Turning radius: approx. 2.1-2.4 m (83-95 in)
- Steering characteristics: smooth, low-effort, precise under load
- Maximum hydraulic system pressure: approx.
2,300-2,600 psi (159-179 bar)
- Pump type: engine-driven external gear pump
- Pump flow: approx. 35-55 L/min (9-14.5 gpm)
- Hydraulic reservoir: approx. 22-26 L (23-27 qt)
- Hydraulic fluid: ISO VG 32 or ISO VG 46
- Lift cylinders: heavy-duty double-acting cylinders
- Tilt cylinders: dual hydraulic cylinders with pressure-relief circuit
- Auxiliary hydraulics: optional circuits for clamps, rotators, and
fork-positioners
| Service Refill Capacities |
- Engine oil: approx. 4-5 L (4.2-5.3 qt)
- Cooling system: approx. 7-8 L (7.4-8.4 qt)
- Transmission fluid: approx. 6-7 L (6.3-7.4 qt)
- Drive axle oil: approx. 4-5 L (4.2-5.3 qt)
- Hydraulic oil: approx. 22-26 L (23-27 qt)
Mast Types:
- Duplex (2-stage)
- Triplex (3-stage with full free-lift)
Lift Height Ranges:
- Duplex mast: approx. 3.0-3.7 m (118-146 in)
- Triplex mast: approx. 4.3-5.5 m (169-216 in)
Free Lift:
- approx. 0.15-0.40 m (6-16 in)
Fork Specifications:
- Standard lengths: 1,067-1,219 mm (42-48 in)
- Optional lengths: 1,524 mm (60 in) and longer
- Fork width: approx. 100 mm (4 in)
- Fork thickness: approx. 40-45 mm (1.6-1.8 in)
Rated lifting capacity: 2,500 kg (5,500 lb) at 600 mm
(24 in) load center
De-rating occurs with:
- increased lift height
- fork extensions
- non-standard attachments (clamps, rotators, sideshift)
- off-center weighting or poor load geometry
- incline operation or uneven terrain
- 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
- Travel speed (unladen): approx. 16-18 km/h (10-11 mph)
- Travel speed (laden): approx. 14-16 km/h (9-10 mph)
- Gradeability (unladen): approx. 18-24%
- Gradeability (laden): approx. 14-18%
- Drawbar pull: approx. 12,000-16,000 N (2,698-3,597 lbf)
- Overall length to fork face: approx. 2.4-2.6 m
(94-102 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. 1.45-1.55 m (57-61 in)
- Ground clearance: approx. 130-150 mm (5.1-5.9 in)
- Turning radius: approx. 2.1-2.4 m (83-95 in)
- Aisle width (1000x1200 mm pallet): approx. 3.6-3.9 m (142-154 in)
- Maximum fork height: 3.0-5.5 m depending on mast
- Free lift: approx. 0.15-0.40 m
- Fork lengths: 42-60 in
- Operating weight: approx. 3,900-4,400 kg (8,598-9,700 lb)
250-Hour
Maintenance:
- Replace engine oil and filter
- Clean radiator fins
- Lubricate mast channels and load dogs
- Inspect air filter
- Check battery and cables
500-Hour Maintenance:
- Replace transmission filter
- Inspect hydraulic filter
- Inspect driveline couplings
- Check axle seals and bearings
1,000-Hour Maintenance:
- Replace transmission oil
- Replace drive axle lubricant
- Inspect tilt and lift cylinders
- Check mast chain stretch and carriage alignment
2,000-Hour Maintenance:
- Replace hydraulic oil
- Replace coolant
- Perform complete mast structural inspection
- Test all safety interlocks and load-handling controls
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