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Part Number
6V8378
NUT
Category: — | Fits: 345C, C18, 3516B, 336D, 3516C, 3126B, 325C, 325D, 3306, 330C, 330D, 3412C, 3512, 3512C, 3516, C13, C15, C27, C7, C9, G3508, 320C, 320D, 345B, 365B
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Fits Equipment Models (25)
3126B 320C 320D 325C 325D 3306 330C 330D 336D 3412C 345B 345C +13

CAT 6V8378 NUT fits Caterpillar 3126B, 320C, 320D, 325C, 325D, 3306 and 19 more models. Available for order at WSTPARTS.

Replaceable OEM Parts (Compatible Models)
No OEM replacement record. Contact us
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CAT 6V8378 NUT for 345C Caterpillar Part - WSTPARTS

6V8378 NUT is a Bolt/Nut component engineered for Caterpillar 345C, C18 and 3516B machines, built to match original factory specifications. It is categorized under Bolt/Nut. Every unit is fitment-verified before dispatch, backed by factory-direct pricing and warranty coverage. Contact our parts team with your machine serial number for a fast quotation.

6V8378 NUT for Caterpillar 345C — Genuine & OEM Replacement Part

WSTPARTS supplies genuine and high-quality OEM replacement NUT (Part # 6V8378). Designed for CAT 345C, C18, 3516B, 336D, 3516C, 3126B, 325C, 325D, 3306, 330C, 330D, 3412C, 3512, 3512C, 3516, C13, C15, C27, C7, C9, G3508, 320C, 320D, 345B, 365B equipment.

Compatible Models

Key Features

  • ✔ 100% compatible with CAT 345C, C18, 3516B, 336D, 3516C, 3126B, 325C, 325D, 3306, 330C, 330D, 3412C, 3512, 3512C, 3516, C13, C15, C27, C7, C9, G3508, 320C, 320D, 345B, 365B
  • ✔ Meets Caterpillar original quality and performance standards
  • ✔ Genuine CAT parts with anti-counterfeit label | OEM alternatives with warranty
  • ✔ Available for order, contact for lead time

Specifications

Part Number (MPN)6V8378
Product NameNUT
BrandCAT
Applicable Models345C, C18, 3516B, 336D, 3516C, 3126B, 325C, 325D, 3306, 330C, 330D, 3412C, 3512, 3512C, 3516, C13, C15, C27, C7, C9, G3508, 320C, 320D, 345B, 365B
Weight0.05 kg
ConditionNew (Genuine / OEM Equivalent)
Warranty12 Months

FAQ

Is 6V8378 the right part for my machine?
Match the part number on your old part, or send us your equipment serial number — WSTPARTS verifies fitment free of charge for CAT 345C.

Genuine vs OEM replacement — what is the difference?
Genuine CAT parts carry an anti-counterfeit label. OEM equivalents are built to the same specifications, bench-tested and supplied with full warranty at a better price.

Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a 12-month warranty.

📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com

Frequently Asked Questions
What equipment does 6V8378 fit?
CAT 6V8378 NUT fits 25 Caterpillar equipment models including 3126B, 320C, 320D, 325C, 325D, verified against Caterpillar parts manuals and confirmed orders.
Is 6V8378 a genuine CAT part?
WSTPARTS supplies genuine CAT parts as well as quality-tested aftermarket alternatives. Contact our sales team for current availability and options for 6V8378.
How can I order 6V8378?
Add 6V8378 to the inquiry cart or contact us with your equipment model and serial number. We ship worldwide and support part number verification.

Parts Diagram3126B

Select model:
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3126B · ELECTRICAL AND STARTING SYSTEM · 146-3638 CAT parts diagram
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19X-4271CONNECTOR
24M-1828RETAINER-SPRING
37T-3269BOOT
47T-3270PLUNGER AS
59M-7609SPRING
64M-1827RETAINER-SPRING
78C-5639TERMINAL
84M-1831PLUG-LEVER HOUSING
97L-2894GASKET
107X-1952HOUSING AS-LEVER
117X-1954HOUSING AS-DRIVE
129X-8070DRIVE AS-STARTING MOTOR
137X-3373BOLT (5/16-18X.88 IN)
143F-0379SCREW-POLE SHOE
157T-3451INSULATOR-TERMINAL
167X-1950SHOE-POLE
178T-8569INSULATOR-TERMINAL
187T-3454INSULATOR
197X-0562WASHER-HARD (13.5X19X0.8MM THK)
206V-6717SCREW-WASHER HEAD
216V-8188NUT (1/2-13 THD)In stock
229X-4824COVER-STARTING MOTOR
239X-4250SOLENOID AS
248F-1434LOCKWASHER
252H-3429RING-RETAINING
268T-0328WASHER-HARD (5.5X10X1MM THK)
279X-4249ARMATURE AS
289X-4248COIL-STARTING MOTOR
299X-4252PLATE AS-STARTING MOTOR
305S-7349BOLT (1/4-20X0.5 IN)
319X-4253HOUSING AS
328T-4205WASHER-HARD (7.2X14.5X2MM THK)
336V-8378NUT (10-32 THD) AVAILABLE REPAIR KIT(S):
347X-1958KIT-LEVER (INCLUDES LEVER AS, SHAFT AS, O-RINGS, STOP, & NUT)
359X-4270KIT-BUSHING (INCLUDES O-RINGS, STOP, NUT SCREW AS, WASHER, WICK, GASKET, SEAL, CUP, & BUSHING)
369X-4251KIT-BRUSH (INCLUDES O-RING, BRUSH, SPRING, & SCREW AS)
Quality Guarantee
Warranty Period 12 months / under normal use
After-sales Response Response within 24h, solution within 48h
Return Policy Return or exchange within 7 days of receipt (original packaging required)
Quality Inspection 100% inspected before shipment; inspection report on request
Technical Support Free installation guidance; engineer support online
📦 Packaging
Packing Method Genuine or neutral packaging available
Protective Packing Shock-proof & moisture-proof materials
Part Number Label Individual part number label
Customization Custom carton marking supported
After-Sales Service Process
01
Contact Us
Describe issue / send photos
02
Engineer Review
Solution within 24h
03
Confirm Solution
Return, repair or replacement
04
Case Closed
Send-back / re-ship / refund
Apply for After-Sales Service
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