Tank cleaning equipment

GJ 4

Our most powerful industrial tank cleaning machine

Our largest industrial tank cleaner, the GJ 4 tank cleaning machine is designed to clean larger-sized tanks with diameters from 15 to 100+ ft. (30+ m). Developed and upgraded from the proven Gamajet III, the GJ 4 is a hydraulically driven rotary tank cleaning machine that revolves 360° in both horizontal and vertical planes. Synchronized solid jets provide a tight and thorough scouring pattern covering all interior tank surfaces in one complete cycle.

The GJ 4 is available in stainless steel with a choice of oil-lubricated or flow-thru (wash fluid lubricated) gearboxes. Gear trains are designed to maximize wear life which offers improved reliability and reduced downtime.

With a choice of twelve nozzle sizes, various hydraulic turbines and stators along with two gear systems, the GJ 4 offers a wide operating range of flow rates, nozzle rotation speeds, and wash cycles. The GJ 4 is fully capable of high concentration chemical recirculation cleaning or high pressure/low volume water jet scrubbing in fixed CIP automated systems.

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Product benefits

  • Powerful: Up to 100 lbs (45 kg) of cleaning force
  • Cleans up to a 100 ft (60 m) radius
  • Heavy-duty, durable design

Operating Range:

  • Pressure: 40 to 300 psi (3 to 20 bar) 
  • Temperature: -60° to 250°F (-29° to 121°C)
  • Flow Rate: 30 to 320 gpm (114 to 1211 l/min) 
  • Cleaning Radius: 100 ft. (30 m)
  • Wash Cycle Time: 3 to 30+ min.
  • Impact: 85 lbs (39 kg) at 25 ft. (7.5 m)

Clearance Dimensions:

  • Pin Drive: 
    - Dual: 12.7 in. (323 mm)
    - Triple: 11.5 in. (293 mm)
  • Optional Clutch Drive: 
    - Dual: 6.7 in. (171 mm)
    - Triple: 9.6 in. (244 mm)
  • Weight: 
    - Dual: 28 lb (12.7 kg)
    - Triple: 29 lb. (13.2 kg)
  • Inlet Connections:
    - Standard: 2 in. NPT female and 2 1/2 in. quick disconnect male
    - Optional 2 in. BSP female and 2 1/2 in. quick disonnect male
    - Optional: 2 in. NPT female and 2 1/2 in. NST (NH) hose thread male

Overall Dimensions:

  • Height: 12.2 in. (310 mm)
  • Diameter: 4.2 in. (107 mm)
  • Width: 6.1 in. (155 mm) including nozzle housing

Other Specifications:

Construction / Design:

New features: Streamlined turbine and internal flow passages, including a patented porting design that significantly improves efficiency.


Investment cast parts of type 316 stainless steel ensure consistent strength & quality for higher pressure ratings.


Rotor shaft and gearbox shafts are made of hardened stainless steel. For increased wear resistance, the rotor shaft is supplied with a plasma-sprayed ceramic or other protective coating. The rotor shaft is also fitted with a polished carbide thrust washer for added durability.

Bearings, Shaft: 

Rotor shaft bearings are tungsten carbide. Gearbox shaft bearings in flo-thru (oilless) gearboxes are PTFE or other non-cupric materials. Standard bearings in oil-lubricated gearboxes are Oilite bronze with nonmetallic bearings available as an option.

Seals, Static: 

O-ring materials are selected for each application. Viton is standard.

Drive Gears:

A new gear system of improved design and construction is incorporated in Gamajet IV "GT" models for increased durability.

Increased wear life: 

All gears are manufactured entirely of selected stainless steel alloys and the two bottom gears are fitted with long-life tungsten carbide thrust washers.

Lubrication, Gearbox: Sealed: 

Oil-lubricated machines have a sealed gearbox filled with FDA approved oil.


The flo-thru gearbox is lubricated by the cleaning solution. With this option, maintenance of gearbox seals is eliminated.

Request a quote

Contact our experts to request a quote or discuss your tank cleaning solution.