Multiquip 8981202622 DEF Tank Filler Cap Assembly

The Multiquip 8981202622 DEF Tank Filler Cap Assembly is a genuine OEM component designed for the DCA400SSI4F series super-silent diesel generators. This direct OEM replacement ensures a proper seal on the diesel exhaust fluid tank, maintaining correct DEF system integrity for Tier 4 emissions-compliant operation. Verified compatible with DCA400SSI4F, DCA400SSI4F3, DCA400SSI4F3PB, DCA400SSI4F3PD, and related DCA400SSI4F-family configurations.

Key Features

• Genuine OEM Sealing Performance — Engineered to the exact cap-to-tank thread specification of the DCA400SSI4F DEF system, ensuring a leak-free, airtight seal every time.
• Direct Drop-In Replacement — Matches the original filler neck diameter and venting configuration, so installation requires only hand-tightening to the existing tank opening.
• Broad DCA400SSI4F Family Fitment — Confirmed for DCA400SSI4F, DCA400SSI4F3, DCA400SSI4F3PB, DCA400SSI4F3PD, and associated super-silent generator variants including Sunbelt-spec units.
• DEF Contamination Prevention — A properly seated cap keeps moisture, debris, and foreign fluids out of the DEF tank — contaminated DEF can trigger selective catalytic reduction (SCR) faults and disable the machine.
• Emissions System Compliance — Critical to maintaining correct Tier 4 DEF delivery; a missing or damaged cap can cause SCR system errors, fault codes, and generator shutdown in compliance-regulated environments.

The DEF tank filler cap assembly seals the diesel exhaust fluid reservoir on Tier 4 super-silent generators, preventing contamination of the fluid used by the selective catalytic reduction (SCR) system to reduce nitrogen oxide emissions. A correctly sealed tank ensures the SCR system receives uncontaminated DEF at the right concentration, which is essential for keeping the generator running within emissions regulations. A cracked, missing, or improperly seating cap can allow moisture or debris into the DEF tank, triggering SCR fault codes that force the unit into derate mode or full shutdown.

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.

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