MD Helicopters CSP-900RMM-2, Техническое обслуживание и ремонт

Страница: 1352 / 2144

CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 422
Revision 36
62-20-00
22. Upper Bearing Cup (Outer Race), Upper
Hub Assembly
(Ref. Figure 407)
Consumable Materials
(Ref. CSP − SPM)
Item Nomenclature
C104 Grease
Special Tools
(Ref. CSP − SPM)
Item Nomenclature
T912 Upper Bearing Outer Race Installation
Tool, Hub
T917 Race Removal Tool
T2018 Press, Hydraulic
T2020 Micrometer, Outside, 6 − 7 In.
T2021 Dial Bore Gage, 2 − 6 In.
A. Removal
NOTE:
Bearing cones, rollers, and cups must
be replaced as a set. It can be necessary to
install a different bearing spacer (shim)
when you replace upper bearing.
Always wear rubber or clean
fabric gloves when you touch
bearing to prevent contamination of bearing
with oil from your skin.
(1). Remove lower bearing (10) (ref. Proce­
dure 21.A.).
(2). Put race removal tool (T917) below
bottom of upper bearing cup (5) and
tighten.
(3). Push bearing cup out of hub with
hydraulic press (T2018).
B. Installation
NOTE:
Bearing cones, rollers, and cups must be
replaced as a set. It can be necessary to
install a different bearing spacer (shim)
when you replace upper bearing.
If you replace bearing, record serial num­
ber of new bearing in rotorcraft log book.
Always wear rubber or clean fabric gloves
when you touch bearing to prevent con­
tamination of bearing with oil from your
skin.
(1). Measure and record outer diameter of
bearing cup, use 6 - 7 in. outside
micrometer (T2020).
(2). Measure and record inner diameter of
upper hub where cup will be installed,
use 2 - 6 in. dial bore gage (T2021).
Bearing cup outer diameter
must be between
0.006 and
0.009 inch (0.15 and 0.23 mm) larger than
upper hub inner diameter.
(3). Record the difference between the two
measurements.
(4). Cool bearing cup in dry ice or freezer for
a minimum of 5 minutes .
(5). Put cooled bearing cup in liquid
nitrogen for a minimum of 10 minutes .
(6). Heat upper hub to a maximum temper­
ature of 200
5
F (93.3
5
C) .
Grease (C104)
(7). Apply a thin layer of grease (C104) to
inner diameter of upper hub where
bearing cup will be installed.
(8). Install bearing cup in upper hub with
hub upper bearing outer race installa­
tion tool (T912).
(a). Make sure bearing cup is fully
installed.
(b). Apply a 500 lb (227 kg) force on
bearing cup until cup is at room
temperature.
CAUTION
CAUTION