CAT 7C8021 GAGE A for C18 Caterpillar Part - WSTPARTS
7C8021 GAGE A is a Bolt/Nut component engineered for Caterpillar C18 and C15 machines, built to match original factory specifications. It is categorized under Bolt/Nut. Every unit is fitment-verified before dispatch. Manual reference: C15: LUBRICATION SYSTEM, group 273-5106, page 513; C18: LUBRICATION SYSTEM, group 241-2422, page 188.
7C8021 GAGE A for Caterpillar C18 — Genuine CAT & Replacement Part
WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement GAGE A (Part # 7C8021). Designed for CAT C18, C15 equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C18, C15
- ✔ Meets Caterpillar original quality and performance standards
- ✔ Genuine CAT lines: New Genuine / Cat Reman / Cat Classic | OEM-equivalent direct replacements
- ✔ Available for order, contact for lead time
Specifications
| Part Number (MPN) | 7C8021 |
| Product Name | GAGE A |
| Brand | CAT |
| Applicable Models | C18, C15 |
| Weight | 0.09 kg |
| Condition | New (Genuine CAT / OEM-equivalent direct replacement) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 7C8021 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 |
| C15 | LUBRICATION SYSTEM | 273-5106 | p.513 |
| C18 | LUBRICATION SYSTEM | 241-2422 | p.188 |
| C18 | LUBRICATION SYSTEM | 187-0672 | p.295 |
| C15 | LUBRICATION SYSTEM | 187-0672 | p.516 |
| C18 | LUBRICATION SYSTEM | 224-0728 | p.298 |
| C18 | BASIC ENGINE | 277-9899 | p.54 |
| C15 | LUBRICATION SYSTEM | 224-0728 | p.520 |
| C15 | LUBRICATION SYSTEM | 273-5106 | p.504 |
System Notes — LUBRICATION SYSTEM
The lubrication system covers the oil pump, oil cooler, oil filter base, relief valves, dipstick tube, pan and the galleries that distribute oil to every bearing in the engine. It is the system that keeps metal off metal. Failures tend to be either pressure loss — a worn pump, a stuck relief valve, a collapsed filter — or contamination, where sludge and debris circulate and score bearing surfaces. Oil pressure that reads low at idle, a filter that comes out heavy, or oil that turns dark far sooner than usual are the signals. Parts in this group are replaced on measured oil pressure and lab results rather than on interval alone.
System Notes — BASIC ENGINE
The basic engine group covers the core structure and internals: cylinder block, cylinder head, pistons, rings, liners, connecting rods, crankshaft, bearings, camshaft and the gasket sets that seal them. These parts determine compression, oil pressure and power output. They wear gradually — rings lose tension, bearings show copper, liners glaze — and the first signs are usually blow-by from the breather, rising oil consumption, or a knock that gets louder as the engine warms. Replacing a basic engine part is a planned overhaul decision rather than a roadside fix, so matching the exact part number and serial number range matters more here than anywhere else on the machine.
FAQ
Is 7C8021 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 C18.
Genuine CAT vs direct replacement — what is the difference?
Genuine CAT covers three factory lines: New Genuine, Cat Reman (core exchange with core charge) and Cat Classic (brand-new economy line). OEM-equivalent direct replacements are non-CAT parts; grade and warranty are confirmed in the quotation.
Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a warranty per quotation.
📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com
