Cat GC45K STR Specifications
The Caterpillar GC45K STR is a 4,500 kg capacity
LPG-powered cushion tire forklift produced from 2019 to 2024, designed for
indoor material handling applications requiring maneuverability in confined
spaces. Powered by a PSI 4X 4.3 L V6 engine or optional GM V6, this seated
operator model delivers reliable performance with low noise and vibration. The
STR designation indicates a short turning radius chassis with extra-heavy,
lead-filled counterweights for enhanced maneuverability and rearward visibility
in tight areas. Standard features include a Powershift transmission,
fully-hydrostatic steering, Operator Presence Detection System, and extended
300-hour service intervals, making this model suitable for warehouse,
manufacturing, and distribution center operations.
Standard Engine Manufacturer: PSI (Power Solutions
International)
Standard Engine Model: PSI 4X
Standard Engine Type: 4-cycle, water-cooled, spark-ignited LPG
Standard Engine Displacement: 262 cu.in (4.3 L)
Standard Engine Rated Output (ISO 1585): 78 kW (104.6 hp) at 2,600 rpm
Standard Engine Maximum Torque: 285 Nm (210 lb-ft) at 1,000 rpm
Standard Engine Revolutions at Max Torque: 1,000 rpm
Standard Engine Number of Cylinders: 6
Fuel Tank: 72 L (19.0 gal)
Optional Engine Manufacturer: General Motors
Optional Engine Model: GM V6
Optional Engine Rated Output: 69 kW (92.5 hp) at 2,450 rpm
Optional Engine Rated Torque: 298 Nm (220 lb-ft) at 1,200 rpm
Optional Engine Displacement: 262 cu.in (4.3 L)
Optional Engine Number of Cylinders: 6
Lubrication Type: Forced circulation with gear pump
Oil Filter: Full-flow cartridge type
Recommended Oil Viscosity: SAE 15W-40 or 10W-30
Extended Service Intervals: 300 hours between oil changes
Cooling Type: Water-cooled, forced circulation
Water Pump: Centrifugal type with belt drive
Radiator: Corrugated fin type with pressure cap
Thermostat: Wax pellet type
Cooling Fan: Suction type
Recommended Coolant: Ethylene glycol based antifreeze mixture
Transmission Type: Powershift
Number of Speeds: 1 forward / 1 reverse
Torque Converter: Precisely matched to engine for high torque and smooth ride
Control: Hydraulic with column-mounted shift lever
Travel Speed (with load): 18.5 km/h (11.5 mph)
Travel Speed (without load): 19.5 km/h (12.1 mph)
Drive Axle (Front): Full-floating type
Steer Axle (Rear): High-strength cast axle housing
Service Brake Type: Hydraulic with vacuum boost, foot-operated
Parking Brake: Mechanical, hand-operated
System Voltage: 12 V
Battery: Lead-acid heavy-duty
Alternator: High-output
Starter Motor: High-torque
Frame Construction: Reinforced welded steel plate
Drive Configuration: 4x2 (front wheel drive)
Counterweight: Extra-heavy, lead-filled for STR configuration
Front Wheel Type: Disc wheel
Rear Wheel Type: Disc wheel
Number of Wheels: 2 front / 2 rear
Front Tire Size: 22 x 9 x 16 in (558 x 229 x 406 mm)
Rear Tire Size: 18 x 7 x 12.1 in (457 x 178 x 307 mm)
Tire Type: Solid rubber cushion
Steering Type: Fully-hydrostatic power steering
Steering Control: Hydraulic with steering wheel
Steering Pump: Gear type, engine driven
Steering Cylinder: Double-acting hydraulic
Steering Effort: Decreased effort with fully-hydrostatic system
Hydraulic System Type: Open center
Hydraulic Pump Type: Gear pump
Hydraulic Pump Flow: 95 L/min (25.1 gpm)
Maximum Operating Pressure (for attachments): 2,970 psi (200 bar)
Relief Pressure: 2,970 psi (205 bar)
Hydraulic Controls: Cowl-mounted with ergonomic design
Mast Type: Standard two-stage simplex mast
Mast Tilt Forward: 5°
Mast Tilt Backward: 10°
Height with Mast Lowered: 83.5 in (2,120 mm)
Height with Mast Raised: 162.2 in (4,090 mm)
Maximum Fork Height: 114.2 in (2,890 mm)
Free Lift: 5.9 in (150 mm)
Height to Top of Overhead Guard: 86.8 in (2,205 mm)
Fork Carriage to DIN 15 173: 3A
Fork Carriage Width: 47.0 in (1,125 mm)
Load Back Rest Height: 48 in (1,220 mm) standard
Rated Load Capacity: 10,000 lb (4,500 kg)
Load Center Distance: 24 in (600 mm)
Load Moment Constant: 16.5 in (420 mm)
Lifting Speed (with load): 0.39 m/s (77 ft/min)
Lifting Speed (without load): 0.42 m/s (83 ft/min)
Lowering Speed (with load): 0.44 m/s (87 ft/min)
Lowering Speed (without load): 0.41 m/s (81 ft/min)
Drawbar Pull (maximum): 7,000 lb (31,140 N)
Drawbar Pull (rated): 23,780 N (5,346 lb)
Gradeability (maximum): 30%
Gradeability (with load): 27%
Maximum Climbing Ability: 27% with load
Overall Length: 146.3 in (3,715 mm)
Length to Fork Face: 98.3 in (2,495 mm)
Overall Width (standard): 46.5 in (1,180 mm)
Height to Top of Overhead Guard: 86.8 in (2,205 mm)
Seat Height: 47.2 in (1,200 mm)
Wheelbase: 62.0 in (1,575 mm)
Load Distance, Axle to Fork Face: 18.3 in (465 mm)
Track Width (front, centre of tyres): 37.0 in (940 mm)
Track Width (rear, centre of tyres): 38.6 in (980 mm)
Ground Clearance (under mast, with load): 3.9 in (100 mm)
Ground Clearance (center of wheelbase, with load): 5.9 in (150 mm)
Overall Width: 46.5 in (1,180 mm)
Fork Dimensions (thickness x width x length): 2.00x6.0x48 in (50x150x1,220 mm)
Fork Spread (minimum out-to-out): 13.5 in (343 mm)
Fork Spread (maximum out-to-out): 41.0 in (1,040 mm)
Minimum Outside Turning Radius: 88.0 in (2,235 mm)
Right Angle Stack (without load): 106.3 in (2,700 mm)
Working Aisle Width (1000 x 1200 mm pallets crosswise): 3,900 mm (153.5 in)
Working Aisle Width (800 x 1200 mm pallets crosswise): 3,700 mm (145.7 in)
Empty Weight: 14,350 lb (6,510 kg)
Axle Load with Maximum Load (front): 21,471 lb (9,650 kg)
Axle Load with Maximum Load (rear): 2,927 lb (1,360 kg)
Axle Load without Load (front): 4,646 lb (2,085 kg)
Axle Load without Load (rear): 9,753 lb (4,425 kg)
Engine Oil Change Interval: 300 hours (extended service
interval)
Engine Oil Filter Change Interval: 300 hours
Transmission Fluid Change Interval: 1,000 hours
Hydraulic Oil Change Interval: 2,000 hours
Hydraulic Filter Change Interval: 500 hours
Coolant Change Interval: 2,000 hours or 2 years
Differential Oil Change Interval: 1,000 hours
Air Cleaner Element Replacement: When indicator shows restriction
Fuel Filter Replacement: 500 hours
Engine Access: Rear-hinged engine cover opens without tools
Tire Pressure: Maintain as specified for solid cushion tires
Mast Chain Adjustment: Check and adjust for proper tension
Lubrication Points: Chassis grease fittings
Grease Type: Lithium complex NLGI No. 2
Recommended Engine Oil: API SL or higher for LPG service
Recommended Transmission Fluid: Caterpillar TO-4 or equivalent
Recommended Hydraulic Fluid: ISO VG 46 anti-wear hydraulic oil
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