Replacing A T4000 Lower Front Fan Tray; Removing The T4000 Lower Front Fan Tray - Juniper T4000 Hardware Manual

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Replacing a T4000 Lower Front Fan Tray

Removing the T4000 Lower Front Fan Tray

Copyright © 2018, Juniper Networks, Inc.
Prevention of Electrostatic Discharge Damage on page 423
T4000 Cooling System Description on page 25
Troubleshooting the T4000 Cooling System on page 351
T4000 Clearance Requirements for Airflow and Hardware Maintenance on page 91
Maintaining the T4000 Air Filters on page 334
The lower front fan tray is located below the front air filter. Each front fan tray weighs
about 20.4 lb (9.3 kg). The fan trays are hot-insertable and hot-removable. The upper
and lower fan trays are interchangeable with each other.
NOTE: Ensure that at any given time only one front fan tray is replaced. Do
NOT replace both the front lower and upper fans simultaneously.
Removing the T4000 Lower Front Fan Tray on page 265
1.
Installing the T4000 Lower Front Fan Tray on page 266
2.
Attach an electrostatic discharge (ESD) grounding strap to your wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Unwrap any PIC cables from the spools on the front cable management system and
2.
remove the cables from the tray. Arrange the cables so that they do not block the
front cable management system and tray, and secure them with temporary fasteners
so that they are not supporting their own weight as they hang from the connector.
CAUTION: Do not let fiber-optic cable hang free from the connector. Do
not allow fastened loops of cable to dangle, which stresses the cable at
the fastening point.
Simultaneously pull the two releases on the front cable management system. Lift it
3.
up and outward to lock it in place to access the lower fan tray.
Rearrange the PIC cables in the front cable management system. For more information
4.
about proper cable arrangement, see
Loosen the captive screws on the corners of the fan tray faceplate.
5.
Grasp the handles, and pull the fan tray halfway out of the chassis.
6.
Chapter 28: Replacing Cooling System Components
"Maintaining T4000 PICs" on page 338.
265