CAT 1140421 SWITCH AS for 345B Caterpillar Part - WSTPARTS
Need a dependable Switch/Relay part for your Caterpillar 345B and 365B machine? The 1140421 SWITCH AS from WSTPARTS is manufactured to OEM-grade tolerances. It is categorized under Switch/Relay. Every unit is fitment-verified before dispatch. Manual reference: 345B: ELECTRICAL AND STARTING SYSTEM, group 149-5079, page 241; 365B: ELECTRICAL AND STARTING SYSTEM, group 145-0526, page 192.
1140421 SWITCH AS for Caterpillar 345B — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement SWITCH AS (Part # 1140421). Designed for CAT 345B, 365B equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 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) | 1140421 |
| Product Name | SWITCH AS |
| Brand | CAT |
| Applicable Models | 345B, 365B |
| Weight | 0.14 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 1140421 in the Caterpillar parts manual: the machine it is published under, the system it belongs to, the group number and the manual page. Use it to confirm the part against your own parts book before ordering.
| Machine | System | Group No. | Manual Page |
| 345B | ELECTRICAL AND STARTING SYSTEM | 149-5079 | p.241 |
| 365B | ELECTRICAL AND STARTING SYSTEM | 145-0526 | p.192 |
| 345B | ELECTRICAL AND STARTING SYSTEM | 149-5079 | p.242 |
| 345B | ELECTRICAL AND STARTING SYSTEM | 149-5079 | p.243 |
System Notes — ELECTRICAL AND STARTING SYSTEM
The electrical and starting system covers the battery, starter motor, alternator, wiring harness, relays, switches and the instrument panel. It carries current from the batteries to the starter to crank the engine, and from the alternator back to keep the batteries charged. Because these machines work in dust, vibration and wide temperature swings, connectors corrode, harness insulation chafes against the frame, and starter solenoids burn out from repeated short cranks. Parts in this group are usually replaced on a symptom basis — slow cranking, a dash warning, lights that dim under load, or a no-start condition traced to an open circuit.
FAQ
Is 1140421 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 345B.
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
