CAT 9Y8420 COVER for 3306 Caterpillar Part - WSTPARTS
9Y8420 COVER is a Structure component engineered for Caterpillar 3306 and 3412C machines, built to match original factory specifications. It is categorized under Structure. Every unit is fitment-verified before dispatch. Manual reference: 3306: GENERATORS, group 108-1870, page 1649; 3412C: OPERATOR STATION, group 154-1702, page 634.
9Y8420 COVER for Caterpillar 3306 — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement COVER (Part # 9Y8420). Designed for CAT 3306, 3412C equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 3306, 3412C
- ✔ 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) | 9Y8420 |
| Product Name | COVER |
| Brand | CAT |
| Applicable Models | 3306, 3412C |
| Weight | 0.05 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 9Y8420 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 |
| 3306 | GENERATORS | 108-1870 | p.1649 |
| 3412C | OPERATOR STATION | 154-1702 | p.634 |
| 3306 | GENERATORS | 114-5510 | p.1650 |
| 3412C | OPERATOR STATION | 154-1703 | p.642 |
| 3306 | GENERATORS | 149-6130 | p.1651 |
| 3306 | GENERATORS | 155-3820 | p.1652 |
| 3306 | GENERATORS | 155-3822 | p.1653 |
| 3306 | GENERATORS | 309-1019 | p.1663 |
System Notes — GENERATORS
The generators group covers the alternator end of a generator set: stator, rotor, exciter, bearings, coupling disc, terminal box and the voltage regulation hardware. It converts engine rotation into electrical output at a held voltage and frequency. Bearing wear and insulation degradation are the two long-term concerns — a bearing that starts to rumble will eventually seize and take the rotor with it, while moisture and heat slowly break down winding insulation. Parts in this group are replaced when vibration rises, when insulation resistance falls on a megger test, or when output voltage becomes unstable under load.
System Notes — OPERATOR STATION
The operator station covers the cab structure, seat and suspension, glass, wipers, door hardware, pedals, joysticks, armrests, HVAC ducting and the interior trim. It is the group that decides how tolerable a ten-hour shift feels. Wear here is driven by daily entry and exit, sun exposure and dust: seat suspensions sag, door struts lose charge, wiper linkages seize, and rubber seals harden until the cab leaks in rain. Parts in this group are replaced when a control feels vague, a latch no longer holds, or the cab no longer keeps dust and water out — small items, but the ones operators complain about first.
FAQ
Is 9Y8420 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 3306.
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
