GC Series Gear Pump, 0.13 cu in/rev, 4-bolt 1.78 in. pilot Mounting Flange, 0.50 in. dia. X 1.50 in. extension Shaft, SAE-6 Side Ports, Bi-Directional with check valves Rotation

Description & Features

The Concentric Rockford Inc GC Series Gear Pump is engineered for high reliability in demanding environments. With a 0.13 cu in/rev displacement, this pump ensures efficient fluid handling. Featuring a 4-bolt 1.78 in. pilot mounting flange, this model allows secure installation and a compact fit.

Constructed with robust cast iron bodies and hardened steel gears, the GC Series Gear Pump offers enduring durability. Equipped with a 0.50 in. dia. x 1.50 in. extension shaft, this pump operates smoothly at a maximum speed of 4000 RPM. Its bi-directional rotation with check valves adds versatility to fluid control applications.

The SAE-6 side ports simplify the connection, maintaining optimal flow with a rated pressure of 3000 PSI. This gear pump incorporates a Viton high-pressure seal and an outboard ball bearing, enhancing its high-pressure capabilities, and superior volumetric efficiency. Additionally, needle bearing construction contributes to its high mechanical efficiency.

Designed for diverse applications, the Concentric Rockford Inc GC Series Gear Pump maintains performance up to a maximum system temperature of 250deg;F. The pump's wide variety of options supports various industrial requirements, making it a versatile choice for fixed displacement applications.

MPN: C1LW73

Supplier Part Number: 1300094

Specifications

Brand
concentric
Dimensions
3.16 in L x 2.812 in W x 3.281 in H
Gear Material
Steel
Gear Type
External
grp Rated Speed
4000 rpm Maximum Shaft Speed, 750 rpm Minimum Shaft Speed
Housing Color
Blue
Housing Material
Iron
Inlet Size
3/4-16
Inlet Type
SAE ORB
Mounting Type
4-Bolt Flange
Outlet Size
9/16-18
Outlet Type
SAE ORB
Rotation
Reversible
Seal Material
FKM
Series
GC Series
Shaft IO
1/2 in Dia x 1-1/5 in Extension

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Product Questions & Answers (3)

Question by: Marvin D on Jun 1, 2025, 8:32 PM
Reckon this'll bolt right up to where my old pump was? Got a 4-bolt flange deal goin' on.
Answer by: Customer Support on Jun 2, 2025, 9:06 PM
Installation-wise, this pump uses a standard 4-bolt, 1.78-inch pilot mounting flange, so it should be a direct mechanical replacement if your old pump matches that configuration.
Question by: Hank P on Jan 14, 2026, 4:57 PM
pump says bi-directional but how does that actually work with the check valves, does it just automatically handle whichever way you spin it?
Answer by: Customer Support on Jan 16, 2026, 6:53 AM
The check valves are what make the bi-directional setup possible. When the pump runs in either rotation, the check valves manage the flow internally so the inlet and outlet function correctly regardless of shaft direction. You do not need to replumb or reconfigure anything when changing rotation. It handles the switching on its own, which makes it a solid choice for applications where drive direction is not fixed or may vary.
Question by: Rex R on Mar 4, 2026, 9:56 PM
trying to match up mounts, is this one the 4-bolt 1.78 pilot flange deal?
Answer by: Customer Support on Mar 6, 2026, 9:21 PM
Mounting is the 4-bolt 1.78 inch pilot style, so it fits setups built around that pilot and bolt pattern.

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