Please help me to solve the issue

[GaryNix]

we have 8610 with two 8005 power supplies (PS). One of the 8005 PS needs to be replaced, I removed the two 8005 PS and used two 8004 PS.

Recently one of the 8004 PS is intermittent, it would be up for a minute and would go down for about 30 seconds.

What could be the issue?

 

[Dr Tuek]

The 8005 has an output of 1140 W @ 120V and the 8004 has an output of 850W @ 120V. Your PS may not be large enough for the actual load..

Nortel Ethernet Routing Switch 8600
Installation-AC Power Supply