Multiquip 820258 Radiator Cap Vanguard HTO/HTN

The Multiquip 820258 is a genuine OEM Radiator Cap Vanguard HTO/HTN designed for Multiquip ride-on trowel and roller equipment including the HHN34TVD, HHXD5, HHXG5, HHXD5-ES, and AR13D. As a direct Multiquip OEM part, 820258 is manufactured to the exact specification of the original component it replaces, ensuring a correct, confident fit with no guesswork. DHS Equipment stocks this part to keep your Multiquip machines running without unnecessary delays. Verify your model code before ordering to confirm compatibility with your specific unit.

Key Features

• Genuine OEM Pressure Integrity — Manufactured to the exact pressure rating of the original cap, maintaining proper cooling system pressurization on Vanguard HTO/HTN-equipped machines.
• Direct-Swap Replacement — Designed to seat and seal on the original radiator filler neck, swapping out with the same thread engagement and sealing surface as the factory cap.
• Broad Multiquip Model Coverage — Fits HHN34TVD, HHXD5, HHXG5, HHXD5-ES ride-on trowels and the AR13D roller, covering multiple machine types within a single part number.
• Cooling System Protection — A correctly rated radiator cap holds system pressure and prevents coolant loss; a failed or wrong-rated cap can cause overheating and engine damage during operation.
• Sourced Directly from Multiquip — Supplied as a genuine OEM component through DHS Equipment, an authorized Multiquip parts distributor, for full confidence in part authenticity.

A radiator cap does more than seal the coolant reservoir — it regulates the pressure inside the cooling system. By maintaining the correct pressure level, it raises the boiling point of the coolant and allows the system to operate efficiently under heavy load. When a radiator cap loses its pressure-holding ability or is replaced with an incorrectly rated unit, the cooling system can lose coolant through overflow, the engine runs hotter than intended, and the risk of overheating increases significantly during sustained use.

Part Details

Compatibility & Fitment

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.