The Husqvarna 521937801 Radiator Cap 15 PSI is a genuine OEM component designed for the FS6600D, FS6600DT, and FS6600DJDT floor saws. As a direct OEM replacement, it is manufactured to Husqvarna's exact pressure specifications, ensuring the cooling system operates at the correct 15 PSI rating. This cap fits directly onto the radiator neck of the listed floor saw models with no modification needed, restoring the sealed cooling system to proper working order. DHS Equipment supplies this part to help keep your equipment running through demanding concrete cutting applications.
Key Features
- Rated at 15 PSI — built to the exact pressure specification required by the FS6600 floor saw cooling system, not a generic approximation.
- Genuine OEM Construction — sourced directly from Husqvarna, ensuring the sealing surface, valve mechanism, and pressure relief threshold match the original component precisely.
- Direct-Fit Replacement — designed to seat and seal on the radiator neck of the FS6600D, FS6600DT, and FS6600DJDT without adapters or alteration.
- Cooling System Integrity — a correctly rated cap maintains the pressurized coolant circuit, preventing overheating during extended floor saw operation.
- System Safety Compliance — the integrated pressure-relief function allows controlled venting if coolant temperature spikes, protecting the engine and operator from a dangerously over-pressurized system.
A radiator cap does more than simply close the coolant reservoir — it actively maintains the pressure inside the cooling system, which raises the boiling point of the coolant and allows the engine to run at optimal temperature. The cap's internal spring-loaded valve releases excess pressure at a precise threshold, protecting hoses, seals, and the radiator from damage. When a cap wears out or loses its pressure rating, coolant can boil off prematurely, leading to overheating, engine stress, and potential failure mid-cut. Replacing it with the correct 15 PSI rated part, such as the 521937801, restores full cooling system function to the FS6600D, FS6600DT, and FS6600DJDT floor saws.
Part Details
| Part Number | 521937801 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Radiator Cap 15 PSI |
Compatibility & Fitment
| Name | Model |
|---|---|
| Floor Saw | FS6600D |
| Floor Saw | FS6600DT |
| Floor Saw | FS6600DJDT |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
