41–01 Driveline Inspecting
Inspecting
1. Check that the yoke-strap capscrews (Fig. 1,
Ref. 4) are tightened as follows:
• Spicer 1590 and 1610: 50 to 60 lbf·ft (68
to 81 N·m)
• Spicer 1710: 125 to 135 lbf·ft (170 to 183
N·m)
CAUTION
Do not overtighten the yoke-strap capscrews, due
to the extreme load occurring at high-speed rota-
tion. A loose or broken capscrew at any point in
the driveline weakens the driveline connection,
which could eventually result in serious vehicle
damage.
2. Check each of the output and input end yokes
(Fig. 1, Refs. 2 and 11) for cracks and loose-
ness. Replace cracked yokes. If any end yoke
can be moved in or out on its shaft, or can be
rocked on its shaft, disconnect the driveshaft and
U-joint from the end yoke. Check the drive com-
ponent’s shaft seal for leakage or other visible
damage that may have been caused by the
loose yoke. Replace the seal if needed. Tighten
the end-yoke nut to the value in Table 1.Ifthe
end yoke is still loose after tightening the yoke
nut, install a new yoke and yoke nut.
End-Yoke Nut Torque Specifications
Description
Thread
Size
Torque
lbf·ft
(N·m)
Transmissions
Fuller FS 4005,
5005, 5106,
6105, and 6206
1-1/4–18
300–350
(405–475)
Fuller RT 6609,
RT/RTO 6610, and
RT 8609
1-1/2–18
400–450
(540–610)
Fuller T 8607,
RT 7608LL,
RT 8608L, and
RT/RTO 6613
2–16
450–500
(610–675)
End-Yoke Nut Torque Specifications
Description
Thread
Size
Torque
lbf·ft
(N·m)
Allison AT-545 1/2–20
*
100–120
(140–160)
Allison MD Series 2–16
600–800
(815–1085)
Single Axle Input Shaft
Meritor RS–13–120,
RS–15–120 and –210,
RS–17–140 and –20,
RS–19–145 and –220,
and
RS–21–145 and –230
M32 x 1.5
740–920
(1000–1250)
Meritor RS–23–160 M45 x 1.5
1000–1230
(1355–1670)
Meritor RS–23–240 M39 x 1.5
920–1130
(1250–1530)
Tandem Axle Input and Output Shafts
Meritor
RD– and RR–17–145,
(of RT–34–145), and
RD– and RR–20–145
(of RT–40–145)
M39 x 1.5
920–1130
(1250–1530)
Coupling Shaft (Midship Bearings)
Spicer 1590, 1610,
and 1710
1-1/4–18
475–525
(644–712)
*
The Allison AT-545 transmission output shaft end-yoke is retained by a
1/2-20 x 1-1/2-inch bolt and a 1-1/16-inch washer. Both the bolt and the
washer must be replaced each time they are removed.
Table 1, End-Yoke Nut Torque Specifications
NOTE: If the end-yoke locknut was removed for
any reason, install a new one.
3. Check the U-joint assemblies for wear by at-
tempting to move the driveshaft up and down,
and from side to side. If movement of the U-joint
trunnion in the bearings is greater than 0.006
inch (0.15 mm), replace the U-joint assembly.
4. Check the midship bearing and bracket for loose-
ness and deterioration by attempting to move the
driveshaft up and down, and from side to side. If
the bearing is loose on its shaft, or rattles, re-
place it. If the bearing bracket is loose on the
frame, or the bearing mount is loose on the
bracket, tighten the mounting bolt nuts 91 lbf·ft
Driveline 41
Business Class Trucks Maintenance Manual, January 1998 41/1
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