Home/Caterpillar 3400 Series Parts/Caterpillar Buna N O-Ring, PAI 321238 (OEM 4D9986), Pack of 4
O-RING
Caterpillar · Models: 3400

Caterpillar Buna N O-Ring, PAI 321238 (OEM 4D9986), Pack of 4

Commercial diesel seal & o-ring. Match the listed part and engine identifiers before ordering.
2-Year WarrantyPAI Industries
$11.96
In Stock
Fitment details

Want us to check the fit? Share any details you have below. All fields are optional. Your request will be included with your order, and a specialist may contact you before fulfillment.

Secure Checkout Review Return Policy Warranty Details
PAI Part #321238
JAK'S Part #JAKS-321238
Catalog ref10-9396
Catalog ref109-4793
Catalog ref109396
Catalog ref1094793
Not sure it's the right fit? Call a specialist
(720) 445-6249
Talk to a tech or text a photo of your part tag — we'll confirm fitment before you buy
Kit Membership

Used In These Kits

This part is included in 1 engine & overhaul kits — find yours below.

Complete The Rebuild

Suggested Additional Parts

Commonly sold with this product. These parts are sold separately.

  1. Caterpillar Buna N O-Ring, PAI (OEM 5M2057), Pack of 5
    321245Caterpillar Buna N O-Ring, PAI (OEM 5M2057), Pack of 5 In stock
    $14.95View ›
  2. Caterpillar Sealing Ring, PAI (OEM 3411429), Pack of 1
    321367Caterpillar Sealing Ring, PAI (OEM 3411429), Pack of 1 In stock
    $5.37View ›
  3. Caterpillar 3412E/C32 Coated Viton O-Ring, PAI (OEM 2594600), Pack of 1
    321469Caterpillar 3412E/C32 Coated Viton O-Ring, PAI (OEM 2594600), Pack of 1 In stock
    $6.38View ›
  4. EPDM O-Ring, PAI (OEM Ref 6L9405), Pack of 1
    321474EPDM O-Ring, PAI (OEM Ref 6L9405), Pack of 1 In stock
    $3.29View ›
  5. Caterpillar 3400 Dark Purple Buna N O-Ring, PAI (OEM 2275538), Pack of 5
    321483Caterpillar 3400 Dark Purple Buna N O-Ring, PAI (OEM 2275538), Pack of 5 In stock
    $87.90View ›
Caterpillar Buna N O-Ring, PAI 321238 (OEM 4D9986), Pack of 4
BrandPAI Industries
Part CategorySeals & O-Rings
Sub-TypeO-Ring
Engine MakeCaterpillar
Engine Model3400
ConditionNew
Stage / TierStandard

PAI 321238 is a buna n o-ring for Caterpillar applications. PAI specifies Buna N construction. The manufacturer designates product-level OEM 4D9986. PAI cross-references Caterpillar 4D9986. PAI lists these application categories: Caterpillar 3400 Series. Confirm the complete required part number before ordering.

Pack of 4.

Manufacturer product cross-references
Caterpillar 10-9396
Caterpillar 109-4793
Caterpillar 109396
Caterpillar 1094793
Caterpillar 186-9812
Caterpillar 1869812
Caterpillar 77-7320
Caterpillar 777320
Caterpillar 8T8100
Cummins 145529

PAI Part #: 321238

OEM References:

  • CATERPILLAR 10-9396
  • CATERPILLAR 109-4793
  • CATERPILLAR 109396
  • CATERPILLAR 1094793
  • CATERPILLAR 186-9812
  • CATERPILLAR 1869812
  • CATERPILLAR 4D9986
  • CATERPILLAR 77-7320
  • CATERPILLAR 777320
  • CATERPILLAR 8T8100
  • CUMMINS 145529

Applications:

  • CATERPILLAR 3400 SERIES

Warranty: 2.0 year(s)