The parts listed in the following table are identified as one of the following: 
•  Tier 1 customer replaceable unit (CRU): Replacement of Tier 1 CRUs is your responsibility. If Lenovo 
installs a Tier 1 CRU at your request with no service agreement, you will be charged for the installation. 
•  Tier 2 customer replaceable unit (CRU): You may install a Tier 2 CRU yourself or request Lenovo to 
install it, at no additional charge, under the type of warranty service that is designated for your server.
•  Field replaceable unit (FRU): FRUs must be installed only by trained service technicians.
•  Consumable and Structural parts: Purchase and replacement of consumable and structural parts 
(components, such as a filler or bezel) is your responsibility. If Lenovo acquires or installs a structural 
component at your request, you will be charged for the service.
Table 22.  Parts list
Index Description Tier 1 CRU Tier 2 CRU FRU Consuma-
ble and 
Structural 
part
For more information about ordering parts: 
1.  Go to 
http://datacentersupport.lenovo.com and navigate to the support page for your server.
2.  Click Parts.
3.  Enter the serial number to view a listing of parts for your server.
1
Top cover
√
2
Riser bracket (low profile-low profile)
√
3
Riser bracket (low profile)
√
4
Riser bracket (full height)
√
5
Riser bracket (low profile-full height)
√
6
Riser bracket (low profile-filler)
√
7
PCIe adapter
√
8
External diagnostics handset
√
9
RAID flash power module holder (on chassis or on 
the system board tray)
√
10
RAID flash power module holder (in riser)
√
11
RAID flash power module
√
12
Power supply unit
√
13
Power supply unit filler
√
14
Front I/O module with diagnostics panel (1)
√
15
Front I/O module with diagnostics panel (2)
√
16
Integrated diagnostics panel assembly
√
17
Front I/O module with diagnostics panel (3)
√
18
OCP module
√
19
Performance heat sink (T-shape)
√
20
7mm drive cage
√
38 ThinkSystem SR635 V3 System Configuration Guide