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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

Displacement 0.13	Displacement 0.129	Brand Concentric Rockford Inc	Brand Concentric Rockford	Pack Size 1.00	UOM EA	Features Viton High-Pressure Seal w/Outboard Ball Bearing	Mount 4-bolt 1.78 in. pilot	Mount 4-bolt 1.78 in. pilot	Ports SAE-6 Side	Ports SAE-6 Side	Pressure Rating 3000	Rated Flow 1	Rated Flow 1	Rotation Bi-Directional with check valves	Shaft 0.50 in. dia. X 1.50 in. extension	Shaft 0.50 in. dia. X 1.50 in. extension	Speed Rating 4000 RPM	Speed Rating 4000 RPM	Supplier Part Number 1300094	Alternate Part Numbers Alternate Part Number C1LW73, Alternate Part Number G1208C3A300N00	Product Weight 4.80 lbs

Product Questions & Answers 3

Product Questions & Answers

Reckon this'll bolt right up to where my old pump was? Got a 4-bolt flange deal goin' on.

Question by: Marvin D on Jun 1, 2025, 8:32 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.

Answer by: Customer Support on Jun 2, 2025, 9:06 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?

Question by: Hank P on Jan 14, 2026, 4:57 PM

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.

Answer by: Customer Support on Jan 16, 2026, 6:53 AM

trying to match up mounts, is this one the 4-bolt 1.78 pilot flange deal?

Question by: Rex R on Mar 4, 2026, 9:56 PM

Mounting is the 4-bolt 1.78 inch pilot style, so it fits setups built around that pilot and bolt pattern.

Answer by: Customer Support on Mar 6, 2026, 9:21 PM

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Model Number	Displacement	Rated Flow	Mount	Shaft	Ports	Rotation	Features	Speed Rating	Pressure Rating
1300086	0.129	1	4-bolt 1.78 in. pilot	0.17 1in. Tang w/Short Coupling	SAE-6 Side	Bi-Directional with check valves	Single Lip Buna-N Pressure Seal	4000 RPM	3000
1300094	0.129	1	4-bolt 1.78 in. pilot	0.50 in. dia. X 1.50 in. extension	SAE-6 Side	Bi-Directional with check valves	Viton High-Pressure Seal w/Outboard Ball Bearing	4000 RPM	3000
1300096	0.258	2	4-bolt 1.78 in. pilot	0.50 in. dia. X 1.50 in. extension	SAE-8 Side	Bi-Directional with check valves	Viton High-Pressure Seal w/Outboard Ball Bearing	4000 RPM	2300
1300098	0.388	3	4-bolt 1.78 in. pilot	0.50 in. dia. X 1.50 in. extension	SAE-10 Side	Bi-Directional with check valves	Viton High-Pressure Seal w/Outboard Ball Bearing	4000 RPM	1600