PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4856Governor,gasoline Engine

Libby Power Systems, Llc · NSN 2990-00-293-5084 · FSC 2990 · No Item Name Available
Verified by PartsTable
NSN 2990-00-293-5084 — this item is cataloged by the U.S. Government under National Stock Number 2990-00-293-5084. Primary manufacturer part number: 4856.
Features
  • Governor,gasoline Engine — FSC 2990
  • Speed Control Type: CONSTANT
  • Spark Control: NOT INCLUDED
  • Mounting Hole Quantity: 2
  • Barrel Quantity Per Box: 1
  • Mounting Flange: INCLUDED
  • Hydraulic Control: NOT INCLUDED
  • Drive Shaft Type: KEYED
Applications
  • Mechanical power generation
  • Drive system operation
  • Auxiliary equipment operation
General Description

The Governor,gasoline Engine, cataloged under National Stock Number 2990-00-293-5084, is classified within Federal Supply Class 2990 (No Item Name Available) of the Engine Accessories group. The primary manufacturer of record is Libby Power Systems, Llc. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN2990-00-293-5084
Primary Part Number4856
Item NameGovernor,gasoline Engine
FSC / FSG2990 / 29 — No Item Name Available
ManufacturerLibby Power Systems, Llc
StatusCANCELLED
Speed Control TypeCONSTANT
Spark ControlNOT INCLUDED
Mounting Hole Quantity2
Barrel Quantity Per Box1
Mounting FlangeINCLUDED
Hydraulic ControlNOT INCLUDED
Drive Shaft TypeKEYED
Drive TypeGEAR
Mounting Hole Diameter0.453 INCHES NOMINAL IN
Butterfly Valve Box Quantity1
Specific UseHERCULES MOTORS CORP ENGINE MODEL NO. JXD
Mounting TypeFLANGE
Governor TypeCENTRIFUGAL
Lever for Manual OperationNOT INCLUDED
Mounting Hole SpacingHOLES SPACED ON 2-3/16 IN. CENTERS IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
3110-00-006-2478A1498 INTERCHANGEABLE
Bearing,ball,thrust
Thern Inc
4320-00-149-2253 INTERCHANGEABLE
Body
1650-00-166-6221485-6 INTERCHANGEABLE
Disc,bearing
Ontic Engineering & Manufacturing, Inc Dba Ontic Us
5120-00-293-2048 INTERCHANGEABLE
Bit,screwdriver
5120-00-490-48564856 INTERCHANGEABLE
Wrench,open End
Huntington Partners, Inc. Dba Continental Tool & Mfg.
2040-00-896-6537 INTERCHANGEABLE
Gear Assembly,bevel
5120-01-087-2798GS15950-1 INTERCHANGEABLE
Puller,piston
Hamilton Sundstrand Corporation Dba Collins Aerospace
5905-01-143-39514856 INTERCHANGEABLE
Resistor
Electro Scientific Industries Inc
5962-01-183-3638 INTERCHANGEABLE
Microcircuit,linear
4730-01-213-9585STBC10GG-128 INTERCHANGEABLE
Clamp,hose
The Boeing Company Div Defense
Cross-Reference Index
Part NumberManufacturer
4856 PRIMARY Libby Power Systems, Llc (USA)
23380CS Brinkley Technology Group Llc Dba Hercules Manufacturing (USA)
23380CS Hercules Engine Co Inc (USA)
Related Parts
3110-00-006-2478INTERCHANGEABLE
BEARING,BALL,THRUST
A1498
4320-00-149-2253INTERCHANGEABLE
BODY
1650-00-166-6221INTERCHANGEABLE
DISC,BEARING
485-6
5120-00-293-2048INTERCHANGEABLE
BIT,SCREWDRIVER
5120-00-490-4856INTERCHANGEABLE
WRENCH,OPEN END
4856
2040-00-896-6537INTERCHANGEABLE
GEAR ASSEMBLY,BEVEL
5120-01-087-2798INTERCHANGEABLE
PULLER,PISTON
GS15950-1
5905-01-143-3951INTERCHANGEABLE
RESISTOR
4856
5962-01-183-3638INTERCHANGEABLE
MICROCIRCUIT,LINEAR
4730-01-213-9585INTERCHANGEABLE
CLAMP,HOSE
STBC10GG-128
5905-01-233-3120INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
7045-01-330-6601INTERCHANGEABLE
BASE,MONITOR,SWIVEL
100A508

Frequently Asked Questions

What is NSN 2990-00-293-5084?

NSN 2990-00-293-5084 is a Governor,gasoline Engine, manufactured by Libby Power Systems, Llc, classified under FSC 2990 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 2990-00-293-5084?

NSN 2990-00-293-5084 has 3 cross-referenced part numbers: 4856 (Libby Power Systems, Llc), 23380CS (Brinkley Technology Group Llc Dba Hercules Manufacturing), 23380CS (Hercules Engine Co Inc).

What NSN replaces 2990-00-293-5084?

There are 12 known substitutes for 2990-00-293-5084: 3110-00-006-2478, 4320-00-149-2253, 1650-00-166-6221 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4856?

Key specifications for 4856: Speed Control Type: CONSTANT; Spark Control: NOT INCLUDED; Mounting Hole Quantity: 2; Barrel Quantity Per Box: 1. 15 total characteristics are documented in the Federal Logistics Information System.

Is NSN 2990-00-293-5084 still in active supply?

NSN 2990-00-293-5084 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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