Hyster S150A Specifications
The Hyster S150A is a high-capacity, cushion-tire,
internal-combustion forklift built during the era when Hyster’s industrial
trucks were engineered for maximum durability, minimal electronics, and
straightforward mechanical serviceability. With a rated capacity of
approximately 15,000 lb (6,804 kg), the S150A belongs to one of the most rugged
production series ever produced by Hyster.
Its immense lifting strength, fortified
chassis, and dependable powertrain made it a preferred machine in steel
plants, metal fabrication facilities, heavy manufacturing operations,
industrial warehouses, brickyards, ports, foundries, and lumber/pipe
yards.
The S150A is built around a powerful industrial engine paired with a
heavy-duty powershift transmission, planetary drive axle, and robust
hydraulic system. Its strong mast designs allow precise load control at
full rated loads, while its cushion tires and low-profile design make it
suitable for smooth factory and warehouse floors.
Despite its size, the truck maintains good
visibility and stable handling due to its extended wheelbase and
center-mounted steering axle. Maintenance personnel appreciate its open
engine bay, basic electrical system, and widely available industrial
components.
The Hyster S150A was built with large-displacement
industrial gasoline or LPG engines, typical for heavy cushion-tire forklifts of
its time.
Common engines include:
- Ford industrial V8 engine (5.0 to 5.8 L, gasoline/LPG)
- Chrysler industrial V8 engine (5.2 to 5.9 L, market dependent)
- Continental large-bore inline-six engines (older units)
Engine Characteristics:
- Displacement range: approx. 5.0-5.9 L
- Power output: approx. 110-140 hp (82-104 kW)
- Peak torque: approx. 250-350 lb-ft (339-475 Nm)
- Idle speed: approx. 650-750 rpm
- Governor speed: approx. 2,500-2,700 rpm
- Fuel type: gasoline or LPG
- Ignition: mechanical distributor or early electronic upgrade modules
These engines produce high torque at low RPM, ideal for moving heavy loads and
performing lift maneuvers at controlled speeds.
Lubrication System
The engine uses a pressure-fed wet-sump lubrication system.
- Oil pump: internal gear type
- Oil capacity: approx. 6.0-8.0 L (6.3-8.4 qt)
- Operating oil pressure: 25-35 psi (172-241 kPa) at idle; 50-70 psi (345-483
kPa) at speed
- Oil type: SAE 10W-30 or 15W-40 depending on ambient temperatures
- Filter: full-flow spin-on type
Cooling System
Built to support heavy workloads and extended run cycles.
- Coolant capacity: approx. 16-20 L (17-21 qt)
- Thermostat opening: approx. 82°C (180°F)
- Cooling system pressure: approx. 13-15 psi (90-103 kPa)
- Water pump: belt-driven centrifugal
- Fan: heavy-duty mechanical fan with steel shroud
Regular radiator cleaning is required in dusty industrial environments.
Transmission
The S150A is equipped with a heavy-duty hydraulic powershift transmission.
- Type: 1- or 2-speed powershift depending on variant
- Forward speed (unladen): approx. 10-12 mph (16-19 km/h)
- Reverse speed: approx. 9-11 mph (15-18 km/h)
- Transmission fluid capacity: approx. 14-18 L (14.8-19 qt)
- Fluid type: ATF Dexron III or industrial ATF
Shifts are executed hydraulically with clutch-pack modulation for smooth
engagement.
Drive Axle
A planetary-reduction front drive axle provides massive torque multiplication.
- Axle oil capacity: approx. 10-12 L (10.5-12.7 qt)
- Lubricant: SAE 80W-90 or 85W-140 gear oil
- Axle type: cast-steel housing with reduction hubs
Brakes
Heavy trucks such as the S150A use industrial braking systems designed for long
life.
- Service brakes: hydraulic wet-disc (preferred on later models) or large drum
brakes
- Parking brake: mechanical or spring-applied brake
The S150A uses a simple 12-volt system designed for
reliability.
- Voltage: 12 V
- Battery capacity: approx. 120-150 Ah
- Alternator output: approx. 70-90 A
- Starter motor: approx. 3.5-4.0 kW
- Ignition (gas/LPG): distributor-based; coil ignition
Minimal electronics reduce failure points.
The S150A features a reinforced welded-steel frame with
extreme load-bearing capacity.
Drive Configuration:
- Drive wheels: front
- Steering wheels: rear
- Drive type: 2WD
The S150A uses large cushion tires designed for heavy loads.
Tire sizes:
- Front: approx. 28x12x22
- Rear: approx. 22x8x16
Rear-wheel hydrostatic steering enhances maneuverability.
Steering:
- Steering type: hydraulic orbitrol system
- Steering pump flow: approx. 12-18 L/min (3.2-4.8 gpm)
- Steering axle: oscillating center-pivot design
- Turning radius: approx. 3.3-3.6 m (130-142 in)
The S150A’s hydraulic system is engineered for high
lifting performance.
- Max pressure: approx. 2,700-3,000 psi (186-207 bar)
- Pump type: gear pump, engine-driven
- Pump flow: approx. 60-80 L/min (15-21 gpm)
- Hydraulic reservoir: approx. 45-55 L (47-58 qt)
- Hydraulic fluid: ISO VG 46 or VG 68
| Service Refill Capacities |
- Engine oil: 6.0-8.0 L (6.3-8.4 qt)
- Cooling system: 16-20 L (17-21 qt)
- Transmission fluid: 14-18 L (14.8-19 qt)
- Drive axle: 10-12 L (10.5-12.7 qt)
- Hydraulic system: 45-55 L (47-58 qt)
The S150A comes with strong mast assemblies built for
heavy lifting.
Mast Types:
- Simplex (2-stage heavy-duty)
- Duplex (2-stage with free-lift)
- Triplex (3-stage full free-lift)
Lift Heights:
- Simplex: approx. 3.0-3.6 m (118-142 in)
- Duplex: approx. 3.6-4.5 m (142-178 in)
- Triplex: approx. 4.5-6.0 m (178-236 in)
Free-Lift Range:
- approx. 0.9-1.5 m (35-59 in)
Fork Specifications:
- Length: 1,067-1,524 mm (42-60 in)
- Optional: 1,829 mm (72 in)
- Width: 150-200 mm (6-8 in)
- Thickness: 50-70 mm (2.0-2.75 in)
Rated capacity: 15,000 lb (6,804 kg) at 24-in (610-mm)
load center
Capacity de-rates with:
- Increased lift height
- Long forks
- Attachments
- High load centers
- Lift speed (unladen): approx. 0.40-0.50 m/s (80-100
ft/min)
- Lift speed (laden): approx. 0.30-0.40 m/s (60-80 ft/min)
- Lowering speed (unladen): approx. 100-130 ft/min
- Lowering speed (laden): approx. 110-150 ft/min
- Gradeability (unladen): approx. 25-30%
- Gradeability (laden): approx. 12-18%
- Drawbar pull: approx. 10,000-14,000 N (2,250-3,150 lbf)
- Overall length to fork face: approx. 3.6-3.8 m
(142-150 in)
- Overall width: approx. 1.6-1.8 m (63-71 in)
- Overhead guard height: approx. 2.3-2.4 m (91-95 in)
- Wheelbase: approx. 2.2-2.3 m (87-91 in)
- Ground clearance: approx. 150-200 mm (6-8 in)
- Turning radius: approx. 3.3-3.6 m (130-142 in)
- Right-angle stacking aisle: approx. 4.8-5.2 m (189-205 in)
- Maximum fork height: approx. 3.0-6.0 m depending on mast
- Free lift: approx. 0.9-1.5 m
- Fork lengths: 42-72 in
- Operating weight: 15,000-18,000 lb (6,804-8,165 kg)
- Counterweight mass: approx. 4,000-5,500 lb (1,814-2,495 kg)
250-Hour Service:
- Replace engine oil and filter
- Clean radiator
- Lubricate mast pivots
- Inspect steering pins
500-Hour Service:
- Replace transmission filter
- Inspect hydraulic filter
- Check axle seals
1,000-Hour Service:
- Replace transmission fluid
- Replace axle gear oil
- Inspect hoses and fittings
2,000-Hour Service:
- Replace hydraulic fluid
- Replace coolant
- Perform full mast inspection
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