NI 21430-91H00

Frequently Asked Questions

Q: What is the pressure rating for the NI 21430-91H00 radiator cap?
A: The NI 21430-91H00 is rated for 13 psi system pressure. This rating controls coolant boiling point and system performance. Using a cap with incorrect pressure rating can cause overheating or coolant loss.

Q: Which electric lift truck models use the NI 21430-91H00?
A: This Nissan OEM radiator cap is a direct replacement for Nissan-powered electric lift trucks and material handling equipment with compatible cooling systems. Verify your radiator inlet diameter and pressure system specification before ordering.

Q: Is this cap suitable for heavy-duty industrial use?
A: Yes. The NI 21430-91H00 is designed for heavy-duty industrial service. The seal design withstands thermal cycling, vibration, and the extended operating hours typical of lift truck and forklift duty.

Q: What does the seal mechanism on this radiator cap do?
A: The integrated seal creates an airtight closure on the radiator filler neck. The seal maintains system pressure, prevents coolant evaporation, and allows the overflow valve to function correctly when the system pressurizes during operation.

Q: When should I replace this radiator cap?
A: Replace the cap if you observe coolant leaks, repeated overheating despite adequate coolant level, or visible seal damage. The rubber seal degrades over time with heat cycling and loses sealing ability.