Hawk 55 kW Heavy-Duty Gearbox — GIGA/TERA Series

The Hawk 55 kW heavy-duty reduction gearbox enables direct coupling of high-powered electric motors and diesel engines to Hawk GIGA and TERA series triplex plunger pumps. Designed for demanding industrial and municipal cleaning applications—including hydro-demolition, surface preparation, sewer jetting, and heat-exchanger descaling—the gearbox reduces engine speed to a fixed 1,000 RPM pump input while transmitting up to 55 kW (73.75 HP) of continuous power. Three factory-set ratio options let you match the gearbox to common 4-pole, 2-pole, and diesel engine speeds without additional drive components.

Specifications

Maximum Power	55 kW (73.75 HP)
Output Speed	1,000 RPM (fixed)
Engine Shaft	40 mm male
Lubrication	SAE 90 gear oil – 0.9 L (31 oz)
Weight	17.8 kg
Compatible Pump Series	Hawk GIGA (GXT, GPX, GXX) & TERA (TXT, TPX)

Available Variants

Part Code	Ratio	Input Speed	Output Speed
1.904-861.0	1.48:1	1,480 RPM	1,000 RPM
1.904-862.0	1.82:1	1,820 RPM	1,000 RPM
1.904-863.0	2.26:1	2,260 RPM	1,000 RPM

Applications

• Industrial high-pressure cleaning and hydro-demolition
• Municipal sewer and drain jetting
• Surface preparation and coating removal
• Heat-exchanger and boiler tube descaling
• Mining and quarry washdown systems
• Ship hull and marine structure cleaning

Key Features

• Heavy-duty helical gears rated to 55 kW continuous duty
• Three ratio options to suit 4-pole motors (1,480 RPM), 2-pole motors (1,820 RPM), and diesel engines (2,260 RPM)
• 40 mm male engine shaft for straightforward motor coupling
• Compact, low-profile housing for tight skid and trailer builds
• SAE 90 oil bath lubrication – minimal maintenance
• Direct bolt-on fitment to all Hawk GIGA and TERA series pumps

Technical Documents

• Hawk 55 kW Gearbox – Parts Schematic (PDF)
• Hawk 55 kW Gearbox – Installation Manual (PDF)

Parts & Service

AES Waterblasters carries the full range of genuine Hawk gearbox spare parts, including gear sets, bearings, seals, and shaft assemblies. Whether you need a scheduled service kit or an emergency replacement part, our team can supply and advise. Contact us on 09 271 4782 or email sales@aesblasters.co.nz for pricing and availability.

Related Models

• Hawk 31 HP PXI Gearbox
• Hawk 24 HP XLTI Gearbox
• Hawk PTO Multiplier