TM-9-2320-272-24-4
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4
JUNE 1998
TM-9-2320-272-24-4 - Page 352 of 836
TM 9-2320-272-24-4
5-50. CENTER SUPPORT MAINTENANCE (Contd)
e. Installation
NOTE
Tilt front end of transmission housing upward before beginning
installation.
1.
Attach center support lifter to center support (4).
NOTE
Ensure center support is seated firmly against second clutch
snapring.
Do not use old-style washer or hex-head anchor bolt.
2.
Carefully position center support (4) in transmission housing (5) with the anchor bolt hole (6) on
center support (4) and transmission housing center support hole (14) aligned.
3.
Install center support (4) in transmission housing (5) with new chamfered washer (13) and anchor
bolt (12). Tighten anchor bolt (13) finger-tight.
4.
Remove center support lifter from center support (4).
5.
Position compressor base (9) on center support (4).
6.
Install compressor bar (10) and screw (8) on transmission housing (5) with two screws (11).
7.
Tighten compressor screw (8) 5 lb-ft (7 N•m).
8.
Measure clearance between top edge of center support (4) and top of center support snapring
groove (7) in transmission housing (5) with snapring gauge.
NOTE
Refer to table 5-14 to select. correct size snapring to be installed in
step 12.
9.
Release pressure from center support (4) by loosening compressor screw (8).
10.
Remove compressor bar screws (11), compressor bar (10) and screw (8), and compressor base (9)
from center support (4).
11.
Install third clutch piston (2) in center support (4).
12.
Install center support snapring (1) in transmission housing (5). Ensure snapring (1) is fully seated.
13.
Tighten anchor bolt (12) 39-46 lb-ft (53-62 N•m)
14.
Apply liberal amount of oil-soluble grease on two new step-joint seal rings (3), and install two new
step-joint seal rings (3) on hub of center support (4).
Table 5-14. Center Support Snapring.
MEASURED
SNAPRING
CLEARANCE
THICKNESS
0.150-0.154 in.
0.148-0.150 in.
(3.81-3.91 mm)
(3.76-3.81 mm)
0.154-0.157 in.
0.152-0.154 in.
(3.91-3.99 mm)
(3.86-3.91 mm)
0.157-0.160 in.
0.155-0.157 in.
(3.99-4.06 mm)
(3.94-3.99 mm)
0.160-0.164 in.
0.158-0.160 in.
(4.06-4.17 mm)
(4.01-4.06 mm)
SNAPRING
COLOR
White
Yellow
Green
Red
5-346
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