Parts Kit, Hydraulic Pump4320-01-388-5804

NSN 4320-01-388-5804 · NIIN 013885804 · Part number 6R2550

Caterpillar Inc Div Caterpillar Defense · FSC 4320 — Power and Hand Pumps · FSG 43 — Pumps and Compressors · CAGE 11083

Government record, cited

NSN 4320-01-388-5804 — this item is cataloged by the U.S. Government under National Stock Number 4320-01-388-5804. Manufacturer of record part number: 6R2550.

Also searched as 4320-01-388-5804 · 4320013885804 · NIIN 013885804 · 01-388-5804 · FSC 4320 Power and Hand Pumps · CAGE 11083 · 6R2550

Nearby stock numbers ← 4320-01-388-5792 Pump, Rotary · 4320-01-388-5822 Pump, Axial Pistons →

Features

Parts Kit,hydraulic Pump — FSC 4320
Component Quantity: 20
End Item Source: 11083
End Item Name: PUMP
Nonsupply Items and Quantities: 11083 5E9194 PLATE BEARING 1;11083 7X9339 PILOT 1;11083 6V3935 RING RETAINING 1;11083 7X9335 RETAINER 1;11083 7X9336 GUIDE 1;11083 303938 SPRING 1;11083 7X9334 SEAT 1;11083 7X8717 CYLINDER BLOCK ASSY 1;11083 7X9341 SPRING 6;11083 7X9337 GUIDE 1;11083 7X9338 RETAINER 1;11083 6R2549 PISTON ASSY 3;11083 7X9333 PIN 1
1 manufacturer part number on file
Manufacturer of record: Caterpillar Inc Div Caterpillar Defense

Identification

NSN: 4320-01-388-5804
NIIN: 013885804
FSC: 4320 — Power and Hand Pumps
FSG: 43 — Pumps and Compressors
Primary part number: 6R2550
Manufacturer: Caterpillar Inc Div Caterpillar Defense

General Description

The Parts Kit,hydraulic Pump, cataloged under National Stock Number 4320-01-388-5804, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4320-01-388-5804
Primary Part Number	6R2550
Item Name	Parts Kit,hydraulic Pump
FSC / FSG	4320 / 43 — Power and Hand Pumps
Manufacturer	Caterpillar Inc Div Caterpillar Defense
Status	ACTIVE
Component Quantity	20
End Item Source	11083
End Item Name	PUMP
Nonsupply Items and Quantities	11083 5E9194 PLATE BEARING 1;11083 7X9339 PILOT 1;11083 6V3935 RING RETAINING 1;11083 7X9335 RETAINER 1;11083 7X9336 GUIDE 1;11083 303938 SPRING 1;11083 7X9334 SEAT 1;11083 7X8717 CYLINDER BLOCK ASSY 1;11083 7X9341 SPRING 6;11083 7X9337 GUIDE 1;11083 7X9338 RETAINER 1;11083 6R2549 PISTON ASSY 3;11083 7X9333 PIN 1

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
6R2550 PRIMARY	Caterpillar Inc Div Caterpillar Defense (USA)

No interchangeability data on file.

Other items in FSC 4320 — Power and Hand Pumps

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4320-00-001-1633

4320-00-001-1633 · Item name not on file

4320-00-001-2628

RETAINER AND PIN

4320-00-001-2629

HOUSING AND PIN

4320-00-001-2630

PUMP,CENTRIFUGAL

4320-00-001-2631

4320-00-001-2631 · Item name not on file

4320-00-001-2632

4320-00-001-2632 · Item name not on file

4320-00-001-3377

4320-00-001-3377 · Item name not on file

4320-00-001-3384

4320-00-001-3384 · Item name not on file

Frequently Asked Questions

What is NSN 4320-01-388-5804?

NSN 4320-01-388-5804 is a Parts Kit,hydraulic Pump, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4320, Power and Hand Pumps. Status: active.

What part numbers are listed for NSN 4320-01-388-5804?

NSN 4320-01-388-5804 has 1 manufacturer part number on file: 6R2550 (Caterpillar Inc Div Caterpillar Defense).

What are the specifications of 6R2550?

Key specifications for 6R2550: Component Quantity: 20; End Item Source: 11083; End Item Name: PUMP; Nonsupply Items and Quantities: 11083 5E9194 PLATE BEARING 1;11083 7X9339 PILOT 1;11083 6V3935 RING RETAINING 1;11083 7X9335 RETAINER 1;11083 7X9336 GUIDE 1;11083 303938 SPRING 1;11083 7X9334 SEAT 1;11083 7X8717 CYLINDER BLOCK ASSY 1;11083 7X9341 SPRING 6;11083 7X9337 GUIDE 1;11083 7X9338 RETAINER 1;11083 6R2549 PISTON ASSY 3;11083 7X9333 PIN 1. 4 specifications are documented in the U.S. Government catalog.

Is NSN 4320-01-388-5804 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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