CAT 8T0644 BOLT for 345C Caterpillar Part - WSTPARTS
WSTPARTS supplies the 8T0644 BOLT, a CAT Bolt/Nut replacement part designed for Caterpillar 345C, 330C and 325C applications. It is categorized under Bolt/Nut. Every unit is fitment-verified before dispatch. Manual reference: 3126B: COOLING SYSTEM, group 117-3433, page 393; 325C: COOLING SYSTEM, group 177-9823, page 110.
8T0644 BOLT for Caterpillar 345C — Genuine CAT & Replacement Part
WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement BOLT (Part # 8T0644). Designed for CAT 345C, 330C, 325C, 3126B, 325D, 330D, 345D equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 345C, 330C, 325C, 3126B, 325D, 330D, 345D
- ✔ 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) | 8T0644 |
| Product Name | BOLT |
| Brand | CAT |
| Applicable Models | 345C, 330C, 325C, 3126B, 325D, 330D, 345D |
| 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 8T0644 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 |
| 3126B | COOLING SYSTEM | 117-3433 | p.393 |
| 325C | COOLING SYSTEM | 177-9823 | p.110 |
| 325D | COOLING SYSTEM | 177-9823 | p.75 |
| 330C | COOLING SYSTEM | 202-7674 | p.123 |
| 330D | COOLING SYSTEM | 202-7674 | p.77 |
| 336D | COOLING SYSTEM | 248-8835 | p.95 |
| 345C | FUEL SYSTEM | 223-7483 | p.111 |
| C13 | BASIC ENGINE | 259-1898 | p.247 |
System Notes — COOLING SYSTEM
The cooling system covers the radiator, water pump, thermostat, fan and fan drive, coolant hoses, clamps, the surge tank and the belts that drive it. It holds engine temperature inside the range where clearances and oil film stay correct. Failures are usually slow and then sudden: a hose softens and balloons before it bursts, a water pump seal starts weeping from the weep hole, a thermostat sticks partly open so the engine runs cold and burns more fuel. On construction sites the radiator also packs with dust and debris, which raises pressure across the core and finds the weakest hose or clamp first.
System Notes — FUEL SYSTEM
The fuel system covers the injection pump, injectors, fuel transfer pump, filters and water separator, lines and the tank. It meters and atomises diesel at the precise moment and quantity the engine needs. Modern CAT engines run very tight injector tolerances, so the group is sensitive to water and dirt: a worn injector dribbles instead of atomising, causing rough idle, white smoke and diluted oil, while a clogged filter starves the pump under load. Parts here are replaced when the engine misfires, smokes, loses power under load, or when the water separator keeps tripping — always after the fuel quality itself has been ruled out.
FAQ
Is 8T0644 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 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
