CAT 1048903 GUARD for 345B Caterpillar Part - WSTPARTS
1048903 GUARD is a Structure component engineered for Caterpillar 345B, 330C and 336D machines, built to match original factory specifications. It is categorized under Structure. Every unit is fitment-verified before dispatch. Manual reference: 330C: LUBRICATION SYSTEM, group 193-2719, page 93; 330D: HYDRAULIC SYSTEM, group 248-9843, page 523.
1048903 GUARD for Caterpillar 345B — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement GUARD (Part # 1048903). Designed for CAT 345B, 330C, 336D, 320D, 330D equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 345B, 330C, 336D, 320D, 330D
- ✔ 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) | 1048903 |
| Product Name | GUARD |
| Brand | CAT |
| Applicable Models | 345B, 330C, 336D, 320D, 330D |
| Weight | 0.23 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 1048903 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 |
| 330C | LUBRICATION SYSTEM | 193-2719 | p.93 |
| 330D | HYDRAULIC SYSTEM | 248-9843 | p.523 |
| 336D | UNDERCARRIAGE | 248-9843 | p.440 |
| 345B | FUEL SYSTEM | 140-1524 | p.125 |
| 330D | HYDRAULIC SYSTEM | 248-9843 | p.527 |
| 345B | FUEL SYSTEM | 140-1524 | p.126 |
| 345B | HYDRAULIC SYSTEM | 143-4259 | p.550 |
| 330D | HYDRAULIC SYSTEM | 248-9843 | p.514 |
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 — HYDRAULIC SYSTEM
The hydraulic system covers the main pump, control valves, cylinders, hydraulic tank, filters, hoses and all the fittings that connect them. It converts engine power into the pressure and flow that drive boom, bucket, steering and travel functions. Hydraulic parts fail mainly through contamination and heat: dirt that passes a worn breather scores pump components, aged hoses crack at the crimp, and O-rings harden and weep under pressure. A part in this group is normally replaced when a function drifts, a cylinder creeps, oil shows up under a machine that used to be dry, or the filter comes out loaded with metal.
FAQ
Is 1048903 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
