Clark GCS25MB Specifications
The Clark GCS25MB is a mid-capacity, cushion-tire
internal-combustion forklift designed for intensive indoor industrial
applications such as manufacturing lines, distribution warehouses, packaging
facilities, and high-cycle dock operations. With a nominal lifting capacity of
2,500 kg (5,500 lb) at a 610 mm (24 in) load center, the GCS25MB belongs to the
heavy segment of cushion-tire lift trucks and is engineered to provide stable,
predictable control in confined aisle environments.
Its compact chassis, reinforced mast assembly,
and low-profile cushion-tire configuration allow excellent
maneuverability in narrow traffic lanes and dense pallet racking
systems. The forklift emphasizes operator comfort, structural
durability, and easy service access, making it suitable for multi-shift
facilities requiring dependable, long-term performance.
The GCS25MB is available with two industrial powerplants: the Waukesha
2.9-liter LPG/Gasoline engine and the Continental TM27 2.7-liter
LPG/Gasoline engine. Both are purpose-built for lift-truck service,
delivering conservative RPM ranges, stable torque output, and long
service intervals under repetitive industrial duty cycles.
Combined with a rugged powershift transmission,
heavy-duty hydraulic system, responsive steering architecture, and
reinforced chassis structure, the GCS25MB provides reliable power
delivery, predictable load handling, and economical long-term operation.
Maintenance procedures are simplified through wide-access panels,
modular components, and easily serviced filters and lubrication points.
The powertrain options for the GCS25MB are engineered
to provide stable torque at low-to-mid RPM ranges, minimal vibration, efficient
thermal control, and dependable operation over extended industrial shifts. Both
engine families use industrial-strength components including cast-iron blocks,
strengthened crankshafts, and conservative fuel mapping to ensure longevity
under continuous load cycles.
Engine Characteristics (Waukesha 2.9L):
- Engine type: 4-cylinder, 4-stroke industrial engine
- Displacement: approx. 2.9 L
- Rated output: approx. 45-60 kW (60-80 hp)
- Peak torque: approx. 140-165 lb-ft (190-224 Nm)
- Idle speed: approx. 750-850 rpm
- Governed maximum: approx. 2,500-2,700 rpm
- Fuel options: LPG or gasoline
- Fuel system: mixer-type LPG system or gasoline carburetor
- Block/head: cast-iron architecture with industrial-strength bearings
- Operational focus: sustained torque for controlled lifting and directional
transitions
Engine Characteristics (Continental TM27
2.7L):
- Engine type: 4-cylinder, 4-stroke
- Displacement: approx. 2.7 L
- Rated output: approx. 45-55 kW (60-74 hp)
- Peak torque: approx. 135-155 lb-ft (183-210 Nm)
- Idle range: approx. 750-850 rpm
- Governed max: approx. 2,600-2,800 rpm
- Fuel type: LPG or gasoline
- Fuel system: mixer-regulated LPG supply
- Design focus: smooth combustion profile for stable low-RPM operation
Lubrication System:
- Lubrication type: full-pressure wet-sump
- Oil capacity (Waukesha): approx. 4.5-5.0 L (4.7-5.3 qt)
- Oil capacity (Continental): approx. 4.0-4.8 L (4.2-5.1 qt)
- Viscosity range: SAE 10W-30 or 15W-40
- Oil pressure: approx. 25-55 psi (172-379 kPa)
- Filtration: full-flow spin-on cartridge
- Lubricated components: crankshaft, camshaft, bearings, valvetrain, auxiliary
drives
Cooling System:
- Cooling type: liquid cooling with pressurized circuit
- Coolant 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
- Cooling fan: engine-driven mechanical fan
The GCS25MB’s drivetrain is engineered for repeated
shuttle cycles, controlled acceleration, and reliable operation over extended
duty periods. The powershift transmission and torque converter provide smooth
engagement under load and reduce driveline stress during directional
transitions.
Transmission:
- Type: single-speed or two-speed powershift
- Forward speed (unladen): approx. 16-18 km/h (10-11 mph)
- Reverse speed: approx. 14-16 km/h (9-10 mph)
- Transmission fluid: approx. 6-7 L (6.3-7.4 qt)
- Fluid type: ATF Dexron III
- Direction control: mechanical or electro-hydraulic lever
Drive Axle:
- Axle type: cast-steel differential housing
- Final reduction: planetary outboard gear reduction
- Differential type: bevel-gear industrial configuration
- Lubricant capacity: approx. 4-5 L (4.2-5.3 qt)
- Lubricant: SAE 80W-90 or 85W-140
- Axle notes: sealed bearings for extended service life
Braking System:
- Service brakes: hydraulic wet-disc brakes
- Parking brake: mechanical lever-applied
- Behavior: fade-resistant, sealed from contaminants, low maintenance cycle
- System voltage: 12 V
- Battery capacity: approx. 80-100 Ah
- Alternator output: approx. 55-75 A
- Starter: approx. 1.7-2.5 kW
- Circuits: seat switch, neutral start, LPG lock-off
- Lighting: standard front work lamps; optional rear lamps/strobe
The GCS25MB’s chassis uses a low-profile cushion-tire
configuration optimized for smooth indoor surfaces such as polished concrete and
sealed warehouse flooring. The structural composition prioritizes vibration
reduction, operator comfort, and equipment longevity.
Drive Configuration:
- Front-wheel drive
- Rear-wheel steering
- 2-wheel drive cushion-tire layout
Tire Specifications (Cushion):
- Front tires: 21x7x15
- Rear tires: 16x6x10.5
Alternative compounds available: non-marking, high-durability indoor compounds.
Chassis Features:
- Reinforced welded-steel frame
- Protected routing for hoses and electrical lines
- Heavy-duty counterweight assembly
- Low step height and ergonomic operator platform
Steering:
- Type: hydrostatic power steering
- Pump flow: approx. 10-13 L/min (2.6-3.4 gpm)
- Steering axle: oscillating center-pivot
- Turning radius: approx. 1.9-2.2 m (75-87 in)
- Steering characteristics: light-effort, responsive, suitable for tight indoor
aisles
The hydraulic system is designed for smooth lifting
performance, precise control, minimal drift, and reliability under
continuous-duty operation.
Hydraulic Specifications:
- Max pressure: approx. 2,300-2,600 psi (159-179 bar)
- Pump: engine-driven gear pump
- Flow rate: approx. 35-55 L/min (9-14.5 gpm)
- Reservoir: approx. 22-26 L (23-27 qt)
- Fluid: ISO VG 32 or 46
- Cylinders: double-acting lift cylinders; twin 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: 6-7 L (6.3-7.4 qt)
- Drive axle: 4-5 L (4.2-5.3 qt)
- Hydraulic system: 22-26 L (23-27 qt)
Mast Types:
- Duplex (2-stage)
- Triplex (3-stage full free lift)
Lift Heights:
- Duplex: 3.0-3.7 m (118-146 in)
- Triplex: 4.3-5.5 m (169-216 in)
- Free lift: approx. 0.15-0.40 m (6-16 in)
Fork Data:
- Standard fork length: 1,067 mm (42 in)
- Optional: 48-60 in
- Fork width: approx. 100 mm (4 in)
- Fork thickness: approx. 40-45 mm (1.6-1.8 in)
Rated Capacity: 2,500 kg (5,500 lb) at a 610 mm (24 in)
load center
Capacity Reduction Due To:
- Increased lift height
- Attachments
- Fork extensions
- Off-center loads
- Unstable load geometry
- 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 (unladen): approx. 18-24%
- Gradeability (laden): approx. 14-18%
- Drawbar pull: approx. 12,000-16,000 N (2,698-3,597 lbf)
- 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. 100-120 mm (4-5 in)
- Turning radius: approx. 1.9-2.2 m (75-87 in)
- Aisle width (1000x1200 pallet): approx. 3.4-3.6 m (134-142 in)
- Maximum fork height: 3.0-5.5 m depending on mast
- Free lift: 0.15-0.40 m
- Fork lengths: 42-60 in
- Operating weight: approx. 3,600-4,100 kg (7,937-9,038 lb)
250-Hour:
- Replace engine oil and filter
- Inspect air filter
- Lubricate mast and steer axle
- Clean radiator fins
500-Hour:
- Replace transmission filter
- Inspect hydraulic filter
- Check driveline and axle seals
- Verify mast chain tension
1,000-Hour:
- Replace transmission oil
- Replace drive axle oil
- Inspect all hydraulic cylinders and hoses
2,000-Hour:
- Replace hydraulic oil
- Replace coolant
- Full mast chain and bearing inspection
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