Specifications

Preventive Maintenance 36 17730-248
AIRTEK
®
•
SOFTEK
®
for Blue Bird Buses
SHACKLE THRUST WASHER INSPECTION (If Equipped)
NOTE SOFTEK Vision 8K capacity vehicles built after 02/2007, and all other vehicles built after
11/2006 are not equipped with shackle thrust washers.
In normal use these components will function satisfactorily, even though the components
may show some wear.
FIGURE 7-24
An indication that the shackle thrust washers are worn, or need replacement is when the
suspension exhibits one or more of the following conditions:
1. Excessive lateral movement of the spring.
2. The rear spring eye and or thrust washers are in contact with the shackle plates.
3. Normal and unacceptable thickness of the thrust washers (See Figure 7-24) can be
measured with a micrometer or a ruler.
■
The normal thickness of a new thrust washer is
3
⁄ 16 " (0.187").
■
The minimum thickness allowable for a thrust washer is
3
⁄ 32 " (0.090").
■
If one or more of these conditions is experienced, disassembly of the rear shack-
le assembly is required to replace the thrust washers.
■
If one thrust washer is worn out, Hendrickson recommends both thrust washers
on that side of the suspension be replaced. Inspect the thrust washers on the other
side of the vehicle and replace if necessary. See Shackle Thrust Washer replace-
ment procedure in the Component Replacement Section of this publication.
Thrust Washer
*Specification provided, controlled and subject to change by vehicle manufacturer.
Shackle Bracket
Shackle Plate
M20 Locknut
Tightening Torque
290-310* ft. lbs.
Leaf Spring with Bushing
Washer
M20 Bolt
L
78
1
APPENDIX
SERVICE MANUAL