Clark GPX25 Specifications
The Clark GPX25 is a mid-capacity pneumatic-tire
forklift engineered for mixed indoor-outdoor industrial applications requiring
dependable load handling, extended service endurance, and stable operational
behavior across variable surfaces.
Rated at a nominal lifting capacity of 2,500 kg
(5,000 lb) at a 610 mm (24 in) load center, the GPX25 occupies a
critical role in distribution centers, fabrication environments,
dockside operations, and logistics yards where maneuverability,
traction, and predictable control are essential.
The GPX25 integrates reinforced mast structures, a rugged welded-steel
chassis, industrial-grade hydraulics, and operator-centered ergonomics
oriented toward multi-shift operations. The pneumatic-tire configuration
(typical sizes: 28x9-15 front, 6.50-10 rear, or equivalent) provides
cushioning, ground clearance, and traction suited to uneven outdoor
surfaces while maintaining acceptable steering precision in indoor
areas.
The powertrain options - Waukesha 2.9-liter and
Continental TM27 2.7-liter engines - deliver conservative,
industrial-focused torque curves optimized for low-speed material
handling, precise load placement, and sustained operating cycles without
excessive thermal loading.
The GPX25 supports two industrial internal-combustion
engines specifically adapted for lift-truck service. Both emphasize low RPM
torque delivery, thermal stability, fuel flexibility, and long mechanical life
under cyclic loading conditions typical of warehouse logistics, yard work, and
repetitive lifting operations.
Engine Characteristics (Waukesha 2.9L):
- Type: 4-cylinder, 4-stroke, overhead-valve industrial engine
- Displacement: approx. 2.9 L
- Output range: approx. 45-60 kW (60-80 hp)
- Torque: approx. 140-165 lb-ft (190-224 Nm)
- Idle speed: approx. 750-850 rpm
- Governed maximum: approx. 2,500-2,700 rpm
- Fuel: LPG or gasoline depending on specification
- Fuel management: mixer-carbureted LPG system or gasoline carburetor
- Construction: cast-iron block; industrial-rated crankshaft and bearings
Engine Characteristics (Continental TM27
2.7L):
- Type: 4-cylinder, 4-stroke industrial engine
- Displacement: approx. 2.7 L
- Output: approx. 45-55 kW (60-74 hp)
- Torque: approx. 135-155 lb-ft (183-210 Nm)
- Fuel: LPG or gasoline
- Governed speed: approx. 2,600-2,800 rpm
- Fuel system: mixer-regulated LPG supply
- Features: smooth torque delivery with emphasis on low-RPM operational
stability
Lubrication System:
- Full-pressure wet-sump lubrication
- Oil capacity (Waukesha): 4.5-5.0 L (4.7-5.3 qt)
- Oil capacity (Continental): 4.0-4.8 L (4.2-5.1 qt)
- Recommended viscosity: SAE 10W-30 or 15W-40
- Operating pressure: approx. 25-55 psi (172-379 kPa)
- Filter: full-flow spin-on
- Lubricated components: crankshaft, rod bearings, valvetrain, camshaft, and
auxiliary systems
Cooling System:
- Cooling type: liquid cooling with thermostat
- Capacity: approx. 7-8 L (7.4-8.4 qt)
- Thermostat opening: approx. 82°C (180°F)
- System pressure: approx. 13-15 psi (90-103 kPa)
- Water pump: belt-driven centrifugal
- Radiator: multi-row industrial core with increased thermal load tolerance
- Fan: mechanically driven cooling fan
The GPX25 uses an industrial powershift transmission
paired with a heavy-duty torque converter engineered for stable, consistent
acceleration under load. The configuration resists overheating during
multi-shift operations and supports repeated directional changes without
compromising driveline integrity.
Transmission:
- Type: single-speed or two-speed powershift (model dependent)
- Forward speed (unladen): approx. 16-18 km/h (10-11 mph)
- Reverse speed: approx. 14-16 km/h (9-10 mph)
- Transmission oil capacity: approx. 6-7 L (6.3-7.4 qt)
- Fluid specification: ATF Dexron III or equivalent
- Control: mechanical or electro-hydraulic directional lever
Drive Axle:
- Construction: cast-steel differential housing
- Reduction: planetary outboard gear reduction hubs
- Differential: bevel-gear configuration
- Lubricant capacity: approx. 4-5 L (4.2-5.3 qt)
- Lubricant grade: SAE 80W-90 or 85W-140
- Additional notes: sealed bearing arrangement for extended service life
Braking System:
- Service brakes: hydraulic wet-disc, oil-immersed
- Parking brake: mechanical hand lever
- Characteristics: high fade resistance, minimized contamination, long overhaul
intervals
- System voltage: 12 V
- Battery capacity: approx. 80-100 Ah
- Alternator output: approx. 55-75 A
- Starter output: approx. 1.7-2.5 kW
- Safety circuits: neutral-start interlock, seat switch, LPG lock-off solenoid
- Lighting: standard front work lamps; optional rear lamps or beacon
The GPX25 chassis features structural reinforcements
designed to accommodate pneumatic tires, increased ground clearance, and
variable outdoor surfaces. Protective routing for hydraulic and electrical
systems reduces exposure to debris, while the integrated counterweight ensures
stable load handling.
Drive arrangement:
- Drive wheels: front
- Steering wheels: rear
- Drive configuration: 2-wheel drive (pneumatic-tire)
Tire specifications:
- Front tires (typical): 28x9-15 pneumatic or equivalent
- Rear tires (typical): 6.50-10 pneumatic or equivalent
Alternative tire compounds vary by region but
maintain similar load and stability characteristics.
Chassis features:
- Welded-steel frame with cross-bracing
- Heavy-duty counterweight design
- Vibration-isolated engine/transmission mounts
- Operator footwell designed for low-effort entry
Steering:
- Type: hydrostatic power steering
- Pump flow: approx. 10-13 L/min (2.6-3.4 gpm)
- Axle: oscillating center-pivot axle for uneven floor compliance
- Turning radius: approx. 2.0-2.3 m (79-91 in)
- Steering dynamics: low-effort input, stable response, indoor/outdoor
compatibility
The hydraulic system is designed for consistent lift
control, minimal drift, and predictable response under varying load conditions.
Hydraulic specifications:
- Maximum pressure: approx. 2,300-2,600 psi (159-179 bar)
- Pump type: engine-driven gear pump
- Flow rate: approx. 35-55 L/min (9-14.5 gpm)
- Reservoir capacity: approx. 22-26 L (23-27 qt)
- Fluid: ISO VG 32 or ISO VG 46
- Cylinders: double-acting lift cylinders; dual tilt cylinders
| Service Refill Capacities |
- Engine oil: 4.0-5.0 L (4.2-5.3 qt)
- Cooling system: 7-8 L (7.4-8.4 qt)
- Transmission oil: 6-7 L (6.3-7.4 qt)
- Drive axle oil: 4-5 L (4.2-5.3 qt)
- Hydraulic oil: 22-26 L (23-27 qt)
Mast options include Duplex and Triplex configurations
engineered for stability, clear operator visibility, and minimal lateral flex
during high elevation loads.
- Duplex lift heights: 3.0-3.7 m (118-146 in)
- Triplex lift heights: 4.3-5.5 m (169-216 in)
- Free lift: approx. 0.15-0.40 m (6-16 in)
- Standard fork length: 1,067 mm (42 in)
- Optional forks: 48-60 in
- Fork section: 100 mm width, 40-45 mm thickness
Rated capacity: 2,500 kg (5,500 lb) at 610 mm (24 in)
load center
De-rating applies with increased lift height, attachments, extensions, or uneven
load distribution
- Lift speed (unladen): 0.45-0.55 m/s (90-110 ft/min)
- Lift speed (laden): 0.30-0.40 m/s (60-80 ft/min)
- Lowering speed: 110-140 ft/min (unladen), 130-160 ft/min (laden)
- Gradeability: approx. 18-24% unladen; 14-18% laden
- Drawbar pull: approx. 12,000-16,000 N (2,698-3,597 lbf)
- Overall length to fork face: 2.3-2.5 m (91-98 in)
- Overall width: 1.05-1.15 m (41-45 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. 120-140 mm (4.7-5.5 in)
- Turning radius: approx. 2.0-2.3 m (79-91 in)
- Aisle width (1000x1200 pallet): approx. 3.6-3.9 m (142-154 in)
- Max 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. 3,800-4,300 kg (8,380-9,479 lb)
250-Hour:
- Replace engine oil and filter
- Inspect air filter elements
- Lubricate steer axle and mast guide components
- Clean radiator fins and verify coolant concentration
500-Hour:
- Replace transmission filter
- Inspect hydraulic filter
- Check driveline couplings and axle seals
- Verify chain tension and mast alignment
1,000-Hour:
- Replace transmission fluid
- Replace drive axle oil
- Inspect all hydraulic cylinders and lines for leakage
2,000-Hour:
- Replace hydraulic oil
- Replace coolant
- Perform comprehensive mast and chain inspection with replacement as needed
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| Front-End Loader Specifications |