Tuthill 4C2EV-CC-7 Foot Mount Gear Pump End 36 GPM Relief Valve
The Tuthill 4C2EV-CC-7 is a size 4 cast iron gear pump end from the C Series, moving a nominal 36 GPM through 1-1/2 inch NPT inlet and outlet ports. It ships as the pump end alone, without a motor or a drive. With a rotor and an idler gear as the only moving parts, the C Series handles thin lubricating oils and heavy viscous stock alike, and the published viscosity range runs from 40 all the way to 10,000 SSU.
This build is integral foot mount with a Viton lip seal, which sets its pressure envelope: inlet pressure to 25 PSI, maximum differential pressure of 100 PSI and maximum discharge pressure of 100 PSI. The V option adds an internal relief valve, supplied with a spring covering 30 to 225 PSI and set to bypass fully at 90 PSI. It protects against over pressure only and is not a flow control device, so continuous bypassing will build heat inside the pump cavity and damage the internals. The C2E build has the mounting foot cast into the housing rather than bolted on, which makes it the straightforward choice for a base plate or skid. It runs a single spring loaded Viton lip seal on precision bronze bearings, and the standard relief spring covers 30 to 225 PSI. Like all C Series pumps it must not be used on plain water, corrosive liquids or abrasive slurries, and it must never be run dry.
Key Features
- Cast iron internal gear construction with only two moving parts
- Nominal capacity of 36 GPM through 1-1/2 inch NPT inlet and outlet ports
- Integral foot mount with a Viton lip seal
- Wide viscosity range of 40 to 10,000 SSU covers thin oils through heavy stock
- Internal relief valve set at 90 PSI and adjustable in the field within the spring range
- Rotors in forged steel with sintered steel idler gears and precision bronze bearings
- Built for counterclockwise rotation viewed from the shaft end
Applications
- Lubrication circuits on air compressors, gas compressors and gearboxes
- Burner oil and fuel oil transfer and circulation
- Low pressure hydraulic supply and control circuits
- Heat transfer oil, quench oil and process oil circulation
- Original equipment packages built around a bare gear pump end
- Transfer duty on viscous non abrasive industrial fluids
Specifications
- Brand: Tuthill
- Manufacturer Part Number: 4C2EV-CC-7
- Part Type: Rotary gear pump end, no motor supplied
- Series: C Series, size 4
- Nominal Capacity: 36 GPM
- Ports: 1-1/2 inch NPT inlet and outlet
- Mounting: Integral foot mount
- Shaft Seal: Viton lip seal
- Rotation: Counterclockwise
- Housing and Cover: Cast iron ASTM A48
- Rotor: Forged steel
- Idler Gear: Sintered steel
- Bearings: Precision bronze
- Maximum Inlet Pressure: 25 PSI
- Maximum Differential Pressure: 100 PSI
- Maximum Discharge Pressure: 100 PSI
- Relief Valve: Internal, spring range 30 to 225 PSI, set at 90 PSI
- Viscosity Range: 40 to 10,000 SSU
- Condition: New
Frequently Asked Questions
Q: What is the difference between the B and the F builds?
The B build uses a mechanical seal and carries the higher pressure ratings, up to 250 PSI inlet and 300 PSI discharge. The F build uses a spring loaded lip seal and is limited to 25 PSI inlet and 100 PSI discharge.
Q: Which shaft seal does this pump take?
Lip seal builds in the size 3 and 4 frames take the 3CF94-7 in Viton, and the size 2 frames take the 2CF94-7. Mechanical seal builds take the 3C1B9 series, with the dash number setting the elastomer.
Q: Where does the relief valve adjusting screw have to point?
On the suction side of the pump. Fitting it the other way round leaves the valve unable to relieve properly, and it is one of the easiest things to get wrong on reassembly.
Q: Can it run at the full 10,000 SSU viscosity?
Yes, but not at full speed. Heavy stock needs the pump slowed down, and the required suction head roughly doubles at the top of the viscosity range compared with a thin oil.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct pump end.
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