Clark GCS17S Specifications
The Clark GCS17S is a compact, cushion-tire
internal-combustion forklift engineered for industrial indoor material-handling
environments requiring exceptional maneuverability, high stability, and
consistent performance across multi-shift operations. With a nominal lifting
capacity of 1,700 kg (3,500 lb) at a 610 mm (24 in) load center, the GCS17S is
positioned in the light-to-mid capacity range, making it ideal for warehousing,
production lines, general manufacturing, packaging, and distribution facilities
where tight aisles, controlled handling, and reliable power delivery are
essential.
The cushion-tire configuration allows the truck
to maintain a low chassis profile and precise load control, particularly
beneficial on polished concrete, sealed surfaces, and indoor
environments where traction and turning precision are vital.
The GCS17S emphasizes durability and ease of maintenance through its
welded-steel chassis, industrial-grade hydraulic system, high-visibility
mast design, and low-effort operator control layout. Two industrial
powerplants are available: the Mitsubishi 2.6-liter LPG/Gasoline engine
and the Continental TM27 2.7-liter LPG/Gasoline engine. Both engines are
optimized for low-RPM torque delivery, consistent throttle response, and
dependable long-service operation.
Combined with a robust powershift transmission,
cast-steel drive axle, hydrostatic steering system, and efficient
hydraulic system, the GCS17S is engineered for smooth handling, long
service intervals, and overall operational economy, making it suitable
for continuous indoor workloads requiring dependable performance and
long service life.
The Clark GCS17S supports two industrial
internal-combustion engines configured to operate on LPG or gasoline, depending
on market availability and emissions requirements. Both engines are designed for
industrial forklift service, offering predictable low-to-mid RPM torque output
and stable thermal management.
Engine Characteristics (Mitsubishi 2.6L):
- Engine type: 4-cylinder, 4-stroke, overhead-valve
- Displacement: approx. 2.6 L
- Rated output: approx. 40-50 kW (54-67 hp)
- Peak torque: approx. 120-140 lb-ft (163-190 Nm)
- Idle speed: approx. 750-850 rpm
- Governed speed: approx. 2,500-2,700 rpm
- Fuel: LPG or gasoline
- Fuel system: mixer-type LPG or industrial carburetor
- Block/head: cast-iron block, aluminum cylinder head
Engine Characteristics (Continental TM27
2.7L):
- Displacement: approx. 2.7 L
- Rated output: approx. 45-55 kW (60-74 hp)
- Torque: approx. 135-155 lb-ft (183-210 Nm)
- Idle speed: approx. 750-850 rpm
- Governed maximum: approx. 2,600-2,800 rpm
- Fuel: LPG or gasoline
- Fuel management: mixer-regulated LPG system
- Construction: cast-iron block and head
Lubrication System:
- Full-pressure wet-sump lubrication
- Oil capacity (Mitsubishi): 4.0-4.5 L
- Oil capacity (Continental): 4.0-4.8 L
- Recommended oil: SAE 10W-30 or 15W-40
- Oil pressure: approx. 25-50 psi
- Filter: spin-on full-flow canister
- Coverage: crankshaft, rod bearings, valvetrain, camshaft, auxiliary systems
Cooling System:
- Cooling: liquid-cooling with pressurized radiator
- Capacity: approx. 6-7 L
- Thermostat opening: 82°C (180°F)
- Cooling system pressure: 13-15 psi
- Pump: belt-driven centrifugal
- Radiator: multi-row industrial core
- Fan: mechanical engine-driven fan
The GCS17S uses an industrial powershift transmission
engineered for continuous shuttle operation, frequent directional changes, and
stable acceleration under load.
Transmission:
- Type: single or two-speed powershift
- Forward speed: approx. 15-17 km/h
- Reverse speed: approx. 13-15 km/h
- Fluid capacity: 6-7 L
- Fluid type: ATF Dexron III
- Direction control: mechanical or electro-hydraulic lever
Drive Axle:
- Cast-steel differential housing
- Planetary final-drive reduction
- Axle lubrication capacity: 4-5 L
- Lubricant: SAE 80W-90 or 85W-140
- Differential: bevel-gear industrial configuration
Braking System:
- Service brakes: hydraulic wet-disc
- Parking brake: mechanical lever
- Characteristics: fade-resistant, sealed, long-life design
- Voltage: 12 V
- Battery: 70-90 Ah
- Alternator: 50-70 A output
- Starter: 1.7-2.2 kW
- Safety circuits: neutral start, seat switch, LPG lock-off
- Lighting: standard front work lights; optional rear lamps
Drive Arrangement:
- Front-wheel drive
- Rear-wheel steering
- 2-wheel drive configuration
Tire Specifications (Cushion Tires):
- Front: approx. 18x6x12.125
- Rear: approx. 16x5x10.5
Optional Tires:
- Non-marking compounds
- High-durometer industrial tires
Chassis Characteristics:
- Reinforced welded-steel frame
- Low step height for easy operator access
- Protected routing for hydraulic and electrical circuits
- Heavy counterweight for balanced load handling
Steering:
- Type: hydrostatic power steering
- Pump flow: 10-12 L/min
- Steering axle: oscillating center-pivot
- Turning radius: approx. 1.8-2.0 m
- Steering behavior: light, responsive, ideal for narrow aisles
- Max system pressure: 2,300-2,500 psi
- Pump type: engine-driven gear pump
- Flow rate: approx. 35-50 L/min
- Hydraulic reservoir: 20-25 L
- Fluid: ISO VG 32 or ISO VG 46
- Cylinders: double-acting lift cylinders; dual tilt cylinders
| Service Refill Capacities |
- Engine oil: 4.0-4.8 L
- Coolant: 6-7 L
- Transmission fluid: 6-7 L
- Drive axle oil: 4-5 L
- Hydraulic oil: 20-25 L
- Mast types: Duplex and Triplex
- Duplex lift heights: 3.0-3.5 m
- Triplex lift heights: 4.3-5.2 m
- Free lift: 0.10-0.35 m
- Fork lengths: 42 in standard; 48-60 in optional
- Fork thickness: approx. 40 mm
- Fork width: approx. 100 mm
Rated capacity: 1,700 kg (3,500 lb) at 610 mm (24 in)
load center
De-rating occurs with:
increased height,
attachments,
extended forks,
off-center loading
- Lift speed (unladen): 0.45-0.52 m/s
- Lift speed (laden): 0.28-0.38 m/s
- Lowering speed: 110-150 ft/min
- Gradeability (unladen): 18-22%
- Gradeability (laden): 12-16%
- Drawbar pull: 8,500-12,000 N
- Length to fork face: 2.15-2.25 m
- Width: 0.95-1.00 m
- Overhead guard height: 2.0-2.1 m
- Wheelbase: 1.35-1.45 m
- Ground clearance: 75-90 mm
- Turning radius: 1.8-2.0 m
- Aisle width: 3.1-3.3 m
- Maximum fork height: 3.0-5.2 m
- Free lift: 0.10-0.35 m
- Fork lengths: 42-60 in
- Operating weight: 3,000-3,500 kg
250-Hour:
- Replace oil and filter
- Clean air filter
- Lubricate mast and steer axle
500-Hour:
- Replace transmission filter
- Inspect hydraulic filter
- Check driveline and axle seals
1,000-Hour:
- Replace transmission fluid
- Replace axle oil
- Inspect cylinders and hoses
2,000-Hour:
- Replace hydraulic oil
- Replace coolant
- Full mast inspection
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