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Gast 4AM-RV-75-GR20 Gear Motor

Gast 4AM-RV-75-GR20 Gear Motor

A reversible, 1.7 HP (1.27 kW) air gear motor featuring a 4-vane design and a 10:1 gear reduction. It delivers up to 640 in-lb of torque and is a preferred choice for hazardous environments where electric spark risks must be eliminated.

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Description

The is engineered for demanding industrial tasks. Because it is powered entirely by compressed air, it is ATEX and CE certified for use in explosive atmospheres (Zones 1 and 2). The 4-vane configuration provides a balanced, cost-effective power output capable of adjusting speed and torque simply by varying the air pressure.

A major technical advantage is its thermal resilience. As air expands through the motor, it naturally dissipates heat, allowing the unit to operate in ambient temperatures up to 121°C (250°F)—well beyond the limits of standard electric gear motors.

Brand

GAST

GAST 

Since 1921, Gast Manufacturing, Inc. has been a leader in the design and manufacturing of quality air-moving products. We specialize in offering cost effective solutions for a wide variety of industries including industrial manufacturing, healthcare, and environmental cleanup applications.

Features

  • 10:1 Gear Reduction: Provides a maximum output speed of 300 RPM, offering a faster alternative to higher-ratio models like the GR25 while still delivering significant torque.
  • Dual Mounting Options: Features both Face and Foot mounting capabilities, allowing for easy integration into existing machinery or custom brackets.
  • Large 1″ Output Shaft: Equipped with a heavy-duty, keyed 1-inch (25.4 mm) steel shaft to manage the high torque output without shearing.
  • Explosion Proof: Non-electrical design is safe for chemical plants, refineries, and spray booths.
  • Instantly Reversible: A 4-way control valve allows the motor to switch rotation directions instantly, even under full load.
  • Stall-Safe: Can be stalled indefinitely without damage, overheating, or the risk of electrical burnout.

Specifications

FeatureSpecification
Maximum Power1.7 hp (1.27 kW)
Gear Ratio10:1
Max Speed300 RPM
Max Torque640 lb-in (72.3 Nm)
Starting Torque @ 80 psi300 lb-in (33.9 Nm)
Max Air Consumption30 CFM ($51 m^3/h$)
Port Size1/4″ NPT
Shaft Diameter1.000 in (1″)
Net Weight28 lbs (12.7 kg)

Applications

  • Heavy-Duty Agitators: Mixing higher-viscosity chemicals or coatings where a balance of speed and torque is required.
  • Conveyor Systems: Powering transport lines in hazardous or “wash-down” environments.
  • Hose Reels: Retracting long-length industrial hoses in fuel depots or refineries.
  • Indexing Tables: Rotating heavy automated platforms that require precise, spark-free speed control.
  • Pumping Systems: Driving positive displacement pumps in processing plants where flammable vapors are present.

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