Clark CQ25L Specifications
The Clark CQ25L is a compact, mid-capacity
internal-combustion LPG-powered cushion-tire forklift designed for indoor
industrial environments requiring strong maneuverability, low emissions, precise
handling, and dependable daily performance.
With a nominal load capacity of approximately
2,500 kg (5,500 lb), the CQ25L is widely used in manufacturing plants,
distribution centers, warehousing complexes, packaging facilities, light
assembly production lines, beverage and food distribution, and general
industrial operations that demand tight-aisle navigation and stable load
control on smooth concrete surfaces.
The CQ25L integrates Clark’s long-proven cushion-tire truck
architecture, combining a welded industrial steel frame, rugged
internal-combustion powertrain, dependable hydraulic system, and a
compact counterbalanced body designed to maximize maneuverability. The
operator compartment provides excellent forward visibility, ergonomic
hydraulic controls, minimized vibration transmission, and intuitive
pedal layout.
Technicians appreciate the straightforward
engine bay layout, accessible filters, simplified hydraulic
arrangements, durable brake system, and industrial electrical system.
The CQ25L delivers efficient fuel use, strong lifting performance,
predictable steering control, and excellent long-term reliability with
proper maintenance.
The Clark CQ25L is powered by efficient LPG
internal-combustion engines engineered for smooth, low-emission indoor-capable
operation. The engine families found in this model include the Nissan K21,
GM/PSI 2.0/2.4L LPG industrial engines, or the Mitsubishi 4G64-LPG depending on
region and year.
Nissan K21 Industrial LPG:
- Configuration: inline 4-cylinder, 4-stroke LPG
- Displacement: approx. 2.1 L
- Power output: approx. 40-50 kW (54-67 hp)
- Peak torque: approx. 140-160 Nm (103-118 lb-ft)
- Rated speed: approx. 2,400-2,600 rpm
- Idle speed: approx. 650-750 rpm
GM/PSI 2.4L LPG:
- Displacement: approx. 2.4 L
- Output: approx. 45-55 kW (60-74 hp)
- Torque: approx. 150-170 Nm (111-125 lb-ft)
- Smooth, low-vibration performance
Mitsubishi 4G64 LPG:
- Displacement: approx. 2.4 L
- Output: approx. 40-50 kW (54-67 hp)
- Torque: approx. 150-180 Nm (111-133 lb-ft)
Engine Construction:
- Heavy-duty cast-iron cylinder block
- Cast-iron or aluminum cylinder head depending on engine family
- Forged-steel crankshaft supported by multiple main bearings
- Aluminum pistons with reinforced crowns and heat-resistant alloy
- Industrial-duty camshaft and valvetrain
Fuel System:
- LPG vaporizer/regulator with integrated heating
- Mixer or fuel-injection throttle body depending on version
- Multi-stage fuel filtration
- Pressure-rated fuel plumbing
- Automatic safety shutoff solenoid
Lubrication System:
- Forced-circulation wet-sump lubrication
- Crankshaft-driven gear-type oil pump
- Oil capacity: approx. 3.5-5.0 L (3.7-5.3 qt)
- Operating pressure: approx. 250-400 kPa (36-58 psi)
- Oil grade: SAE 10W-30 or 15W-40
- Full-flow spin-on oil filter
Cooling System:
- Liquid-cooled system with centrifugal water pump
- Coolant capacity: approx. 6-8 L (6.3-8.4 qt)
- Thermostat opens near 82°C (180°F)
- Pressurized radiator (approx. 13 psi / 90 kPa)
- Designed for clean-running indoor operations requiring stable temperatures
The CQ25L uses a compact, responsive industrial
powershift transmission engineered for smooth direction changes and continuous
light-to-medium warehouse duty cycles.
Transmission:
- Type: torque-converter powershift
- Forward travel speed (unladen): approx. 15-18 km/h (9-11 mph)
- Reverse travel speed: approx. 13-15 km/h (8-9.5 mph)
- Transmission fluid capacity: approx. 5-7 L (5.3-7.4 qt)
- Recommended fluid: Dexron III ATF
- Directional changes via steering-column mounted lever actuating hydraulic
clutch packs
Drive Axle:
- Cast-steel differential housing
- Planetary reduction hubs for torque multiplication
- Axle oil capacity: approx. 3-4 L (3.2-4.2 qt)
- Lubricant: SAE 80W-90 gear oil
Brake System:
- Service brakes: hydraulic drum brakes (standard)
- Optional wet-disc brakes for high-duty applications
- Parking brake: mechanical lever-operated drum brake
- Designed for smooth braking on polished indoor concrete
- System voltage: 12 V
- Battery capacity: approx. 55-75 Ah
- Alternator output: approx. 35-60 A
- Starter motor: approx. 1.2-1.8 kW
- Wiring: industrial-grade loom with thermal and abrasion protection
- Safety systems: neutral-start switch, operator-presence system, seat-switch
interlock
- Lighting: headlights, rear lamps, optional overhead work lamps
Drive
Configuration:
- Drive wheels: front
- Steering wheels: rear
- Operating type: 2WD cushion-tire forklift
Cushion Tires:
- Front tire size: approx. 21x7x15
- Rear tire size: approx. 16x5x10.5
Optional Tires:
- Non-marking cushion tires
- High-temperature cushion tires
- Low-profile cushion tires
Chassis Structure:
- Fully welded industrial steel frame
- Reinforced mast support base with heavy plate brackets
- Integrated counterweight optimizing load balance
- Underframe protection for hydraulic and electrical lines
Steering:
- Steering type: fully hydrostatic power steering
- Steering pump flow: approx. 6-10 L/min (1.6-2.6 gpm)
- Steering axle: oscillating rear axle with pivot bushings
- Turning radius: approx. 1.7-1.9 m (67-75 in)
- Steering response: extremely agile, precise, designed for tight aisles
- Maximum hydraulic pressure: approx. 2,000-2,200 psi
(138-152 bar)
- Pump type: engine-driven external gear pump
- Pump flow: approx. 25-35 L/min (6.6-9.2 gpm)
- Hydraulic reservoir: approx. 20-25 L (21-26 qt)
- Recommended fluids: ISO VG 32 or VG 46
- Lift cylinders: twin double-acting cylinders with cushioned travel
- Tilt cylinders: dual cylinders providing mast pitch control
- Optional hydraulic circuits: sideshift, fork positioner, clamps
| Service Refill Capacities |
- Engine oil: 3.5-5.0 L (3.7-5.3 qt)
- Cooling system: 6-8 L (6.3-8.4 qt)
- Transmission oil: 5-7 L (5.3-7.4 qt)
- Drive axle oil: 3-4 L (3.2-4.2 qt)
- Hydraulic oil: 20-25 L (21-26 qt)
Mast Types:
- Two-stage (V mast)
- Three-stage (FV full free-lift 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 lengths: 914-1,067 mm (36-42 in)
- Optional: 1,067-1,219 mm (42-48 in)
- Width: approx. 100-125 mm (4-5 in)
- Thickness: approx. 35-45 mm (1.4-1.8 in)
- Rated load: approx. 2,500 kg (5,000-5,500 lb) at 600
mm (24 in) load center
Load de-rating occurs with:
- increased mast elevation
- long forks or fork extensions
- sideshift or attachment use
- off-center loads
- incline-based operation
- 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. 15-18 km/h (9-11 mph)
- Travel speed (laden): approx. 12-14 km/h (7-9 mph)
- Gradeability (unladen): approx. 18-22%
- Gradeability (laden): approx. 10-14%
- Drawbar pull: approx. 10,000-15,000 N (2,248-3,370 lbf)
- Overall length to fork face: approx. 2.1-2.3 m (83-91
in)
- Overall width: approx. 1.0-1.1 m (39-43 in)
- Overhead guard height: approx. 2.0-2.1 m (79-83 in)
- Wheelbase: approx. 1.4-1.5 m (55-59 in)
- Ground clearance: approx. 80-100 mm (3.1-4.0 in)
- Turning radius: approx. 1.7-1.9 m (67-75 in)
- Aisle width (1000x1200 pallet): approx. 3.0-3.3 m (118-130 in)
- Maximum fork height: 2.5-5.5 m depending on mast option
- Free lift: 0.1-0.8 m
- Fork lengths: 36-48 in
- Operating weight: approx. 3,200-3,800 kg (7,055-8,378 lb)
- Counterweight mass: approx. 700-1,100 kg (1,543-2,425 lb)
250-Hour
Maintenance:
- Replace engine oil and filter
- Lubricate mast and steering linkages
- Clean radiator fins
- Clean or replace air filter
- Inspect battery
500-Hour Maintenance:
- Replace fuel filter
- Inspect driveline
- Check brake drums/shoes
- Inspect axle seals
1,000-Hour Maintenance:
- Replace transmission oil
- Replace axle lubricant
- Inspect hydraulic cylinders
- Check chain stretch
2,000-Hour Maintenance:
- Replace hydraulic oil
- Replace coolant
- Full mast structural inspection
- Test operator-presence and neutral-start circuits
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