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GC Series Gear Pump, 0.39 cu in/rev, 4-bolt 1.78 in. pilot Mounting Flange, 0.50 in. dia. X 1.50 in. extension Shaft, SAE-10 Side Ports, Bi-Directional with check valves Rotation

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Description & Features

CONCENTRIC ROCKFORD INC brings you the GC Series Gear Pump, engineered for reliable performance under rugged conditions. This gear pump features a displacement of 0.39 cu in/rev and is equipped with a 4-bolt 1.78 in. pilot mounting flange.

Designed with cast iron bodies and hardened steel gears, this pump ensures superior volumetric efficiency and high mechanical efficiency. The 0.50 in. diameter x 1.50 in. extension shaft and SAE-10 side ports facilitate versatile installation.

Capable of a maximum speed of 4000 RPM and a minimum speed of 750 RPM, it operates bi-directionally and includes check valves. The maximum system temperature is 250deg;F with a pressure rating of 1600 PSI, supporting various industrial applications.

Among its features, the pump incorporates Viton high-pressure seals with an outboard ball bearing and needle bearing construction, ensuring long-life service. The rated flow is 3 GPM.

Supplier Part Number: 1300098

MPN: C1LW75

Specifications

Dimensions
3.69 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
7/8-14
Inlet Type
SAE ORB
Mounting Type
4-Bolt Flange
Outlet Size
3/4-16
Outlet Type
SAE ORB
Rotation
Reversible
Seal Material
FKM
Series
GC Series
Shaft IO
1/2 in Dia x 1-1/5 in Extension

Product Questions & Answers (3)

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Question by: Brent S on May 26, 2025, 4:16 PM
got a 4-bolt 1.78 pilot mount on my setup. is that what this pump takes, and what shaft size are we talkin?
Answer by: Customer Support on May 28, 2025, 2:42 PM
It uses a 4-bolt 1.78 in. pilot mounting flange and it comes with a 0.50 in. diameter shaft with a 1.50 in. extension.
Question by: Wayne B on Apr 1, 2025, 2:38 PM
pump's rated at 3 GPM and 1600 PSI, is that enough muscle for a mid-size log splitter or similar equipment runnin continuous cycles?
Answer by: Customer Support on Apr 2, 2025, 8:20 PM
For a mid-size log splitter, those numbers line up pretty well. At 3 GPM and 1600 PSI, you've got enough flow and pressure to drive most standard single-stage splitter cylinders without pushing the pump past its limits. One thing worth keeping in mind is that the ratings on this unit are based on anti-wear hydraulic fluid at 200 SSU viscosity, so as long as your fluid matches up, you should get consistent output. The pump also handles speeds between 750 and 4000 RPM, so your prime mover has plenty of range to work within.
Question by: Shane W on Oct 27, 2025, 6:36 AM
What kind of fluid is best in this pump?
Answer by: Customer Support on Oct 28, 2025, 2:04 PM
Ratings are based on using anti-wear hydraulic fluid with a viscosity of 200 SSU. If you're looking to use something different, it's best to get in touch with us so we can advise you.

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