Box Motor With Internal Check Valves For Bi-Rotational Capability, 5.15 cu in/rev, 4 Bolt SAE B Mounting Flange, 13 Tooth SAE B Splined Shaft, 1-1/4 NPT Side and Rear Ports, Bi-Rotational, Case Drain

Description & Features

This motors bi-rotational capability is enhanced by internal check valves that drain case pressure back to the low-pressure side. With a displacement of 5.15 cu in/rev and a 4 Bolt SAE B mounting flange it is ideal for demanding industrial applications. A 13 Tooth SAE B splined shaft and side and rear 1-1/4 NPT ports add versatility. The motor operates at a rated speed of 2000 RPM and a pressure rating of 2500 PSI. Outlet pressures over 50 PSI require a case drain. Precision-cut gears and a special iron alloy ensure maximum volumetric efficiency. The 'Continental Shaft feature allows easy shaft changes without full motor disassembly. To maintain performance use a 25 micron return filter with a B10 rating of at least 2.2. Continuous system temperature should remain under 150F for durability.

MPN: M5100C731OFXK20-14

Supplier Part Number: M5100C731OFXK20-14

Specifications

Bearing Type
Roller
Color
Blue
Dimensions
7.88 in L x 5.61 in W x 6.25 in H
grp Maximum System Temperature
Under Normal Conditions of Continuous Operation, Not to Exceed 150 deg F. Never to Exceed 185 deg F
Grp Note
Ratings Based on Using Anti Wear Hydraulic Fluid. For Information on Use With Other Fluids, Contact Us For Assistance
Grp Pressure Limit
Inlet: 2500 psi, Outlet: Pressures Over 50 psi Require a Case Drain Line be Installed
grp Recommended Filtration
25 um Return Filter with B10 Rating of at Least 2.2
Housing Material
Iron
Mounting Type
SAE B 4-Bolt Flange
Port Location
Side and Rear
Port Type
NPT
Rotation
Reversible
Rotation Direction
Reversible
Series
M5100 Series
Shaft
13 Tooth SAE B Splined
Shaft Type
Splined

Product Questions & Answers (2)

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Question by: Shane M on Mar 4, 2026, 10:54 AM
got a setup where the return side can see some backpressure. when do i need to run a case drain on this motor?
Answer by: Customer Support on Mar 5, 2026, 8:21 PM
Once outlet pressure goes over 50 PSI, a case drain line is required. This motor has internal check valves that route case pressure back to the low pressure side, but it still needs that case drain any time you are above that 50 PSI outlet backpressure limit.
Question by: Randy W on Jun 26, 2025, 6:38 AM
got a setup running both directions depending on the job, does this motor actually handle true bi-rotational use or is that just a marketing thing
Answer by: Customer Support on Jun 27, 2025, 1:02 PM
Bi-rotational operation is fully supported on this motor, and the internal check valves are what make it work properly. Those valves automatically route case pressure back to whichever side is running low pressure, so you're not fighting back-pressure damage when you reverse direction. No external hydraulic connections changes needed to swap rotation.

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