Tuthill 4RC2F-RH-C Reversible Cast Iron Gear Pump End 1-1/2 in NPT
Rated at a nominal 36 GPM with 1-1/2 inch NPT porting, the Tuthill 4RC2F-RH-C is a size 4 C Series cast iron gear pump end. No motor is supplied, which is how these pumps are normally bought for a rebuild or for an equipment build. Pumping action comes from a rotor and an idler gear either side of a crescent cast integral with the cover. Two moving parts means very little to wear, and the series is rated across a wide viscosity band from 40 to 10,000 SSU.
This build is flange mount with a spring loaded 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. There is no internal relief valve on this build, so a positive displacement pump like this one needs an external bypass somewhere in the discharge piping before it is put to work. This is the reversing version of the flange mounted C2F. Rotating the cover through 180 degrees moves the suction port to the opposite side of the pump, which lets one unit serve either piping hand. The RH suffix records the suction location as the pump is supplied. 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
- Flange mount with a spring loaded lip seal
- Wide viscosity range of 40 to 10,000 SSU covers thin oils through heavy stock
- Straightforward wet end with no internal valve to set or maintain
- Rotors in forged steel with sintered steel idler gears and precision bronze bearings
- Reversing design lets the cover rotate 180 degrees to change the suction side
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: 4RC2F-RH-C
- 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: Flange mount
- Shaft Seal: Spring loaded lip seal
- Rotation: Reversible
- 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: None fitted
- Viscosity Range: 40 to 10,000 SSU
- Condition: New
Frequently Asked Questions
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.
Q: Does the pump self prime?
It will prime on its own once the internals are wetted, but the ports should face upward on installation so air can clear. If nothing is discharged after about sixty seconds, stop and find out why rather than letting it run.
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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