Japan Air Motor JAM-8PE-1200SR Pneumatic Motor

Japan Air Motor Co., Ltd. JAM-8PE-1200SR Heavy-Duty Pneumatic Motor

The Japan Air Motor Co., Ltd. JAM-8PE-1200SR is a high-torque radial piston air motor engineered for mission-critical industrial and shipboard installations. Built specifically to withstand harsh offshore environments, hazardous atmospheres, and severe duty cycles, the JAM-8PE series combines mechanical simplicity with high starting torque and stall tolerance.

Operating at a nominal pressure of 0.6 MPa (6 kgf/cm² / ~85–90 PSI) and calibrated for a rated speed of 1200 RPM, this motor drives heavy rotary equipment where electrical prime movers introduce spark, explosion, or moisture-ingress risks.

Every unit sourced through our marine engineering inventory is subjected to dimensional checks, seal verification, pneumatic pressure-hold testing, and dynamic bench testing under variable loads to verify displacement, RPM, and air consumption rates against original Osaka factory design curves.

Technical Specifications

Features

1. High Breakaway & Starting Torque: Multi-cylinder positive displacement delivers maximum torque immediately upon line pressurization, preventing drop or hesitation in deadweight lifting setups.
2. Intrinsically Safe for Hazardous Atmospheres: 100% pneumatic execution eliminates electrical coils, slip rings, and thermal ignition sources, making it suited for Zone 1 and Zone 2 hazardous areas, tanker decks, and paint rooms.
3. Continuous Stall Tolerance: Designed to stall indefinitely under peak load without insulation degradation, electrical overload tripping, or mechanical burn-out.
4. Corrosion-Resistant Marine Construction: High-tensile cast iron crankcase and precision-ground, surface-treated cylinder liners resist sea-spray, high ambient humidity, and salt fog.
5. Reversible Operation (SR Configuration): Bi-directional rotary distribution sleeve enables smooth direction reversal under continuous load cycles.

Compatible Marine & Industrial Machinery

• Accommodation Ladder & Gangway Winches: Samgong, Manabe Zoki, Fukushima, Tsuji, and Mitsui-Paceco deck winches.
• Lifeboat & Rescue Boat Davits: Schat-Harding, Ned-Deck, Oriental Precision, and Sekigahara davit winches.
• Mooring & Cargo Deck Gear: Pneumatic warping heads, capstans, hose handling cranes, and pilot hoists.
• Industrial Mixing & Fluid Agitation: Paint, solvent, resin, and chemical compounding reactors requiring spark-free agitation drives.
• Mining & Tunneling Machinery: Conveyor tensioners, pneumatic shunting winches, and auxiliary bore-pulling machinery.

Frequently Asked Questions

What does the model code “JAM-8PE-1200SR” mean?

“JAM” designates Japan Air Motor Co., Ltd. “8PE” specifies the piston motor displacement platform rated for approximately 8 PS nominal performance class. “1200” indicates the design-rated output speed of 1200 RPM at 0.6 MPa, while “SR” indicates a bi-directional, reversible valve-gear configuration.

Can the JAM-8PE-1200SR operate using unregulated compressed air?

No. Standard ship service air lines can reach 0.9 to 1.0 MPa (9–10 bar). Running the JAM-8PE-1200SR above its rated 0.6–0.7 MPa maximum continuous rating can stress connecting rod journals, wear rotary valve sleeves prematurely, and compromise internal bearings. Always feed the motor via a dedicated pressure-reducing station.

How do I reverse the rotation of this motor?

The JAM-8PE-1200SR is equipped with dual main supply ports. Connecting air flow to Port A directs air to rotate the shaft clockwise (CW), with Port B functioning as secondary exhaust. Directing air flow into Port B rotates the shaft counter-clockwise (CCW), with Port A venting. A standard 3-position, 4-way, spring-centered or detented directional valve (closed or open center) is typically used for control.

What lubricant is recommended for the crankcase and air stream?

For the inline air lubricator, use light non-detergent pneumatic tool oil (ISO VG 32 or ISO VG 46). If your model features an oil-sump crankcase reservoir, maintain level with ISO VG 100 or SAE 30 industrial gear/machine oil, checking level before every major deck operation.

Is this motor suitable for direct coupling to accommodation ladder winches?

Yes. The JAM-8PE series is standard equipment on Japanese and Korean-built vessels for gangway, pilot ladder, and accommodation ladder winches due to its high holding and breakaway torque under full suspended weight. Ensure the mounting pilot diameter and output shaft keyway match your winch reduction gearbox flange specifications.