Specifications

17730-248 89 Component Replacement

AIRTEK

•

SOFTEK

for Blue Bird Buses

4. Slide the reamer out of the bottom of the steering knuckle assembly. If it is necessary

to remove the reamer from the top, rotate the reamer opposite of cutting rotation.

5. Clean and remove all kingpin bushing material from the steering knuckle assembly.

Take special attention to remove material from the grease channels and dimples.

6. Clean the

" brake backing plate bolts with a wire wheel and run a tap through the

threads of the lower steering knuckle assembly and then flush out with brake cleaner

and dry with compressed air.

PRIOR TO INSTALLATION ENSURE THAT ALL RESIDUAL LOCTITE

MATERIAL IS REMOVED FROM

THE MOUNTING BOLTS AND THE THREAD BORES IN THE UPPER STEERING KNUCKLES, AND

NEW LOCTITE 277 OR EQUIVALENT IS APPLIED TO HELP ENSURE THAT THE BOLTS SUSTAIN

THE PROPER TORQUE REQUIREMENT. FAILURE TO DO SO CAN CAUSE LOSS OF VEHICLE

CONTROL RESULTING IN PERSONAL INJURY OR PROPERTY DAMAGE.

NOTE The Hendrickson Genuine part, socket head cap screw comes with a pre-applied loctite

compound.

7. Install the upper and lower steering knuckle on the kingpin.

8. Check for the proper fit by rotating the knuckle assembly back and forth to verify there

is no binding on the kingpin, see Figures 9-70 and 9-71.

9. If the bushing is too tight repeat steps 1 through 8 until the proper clearance is

achieved.

NOTE Bushing size is to be 0.001" larger than the kingpin size.

FIGURE 9-70 FIGURE 9-71

KINGPIN SEAL INSTALLATION

1. Place the steering knuckle assembly in a vise with brass jaws or place on a suitable work-

bench. The steering knuckle will have the machined surface facing up (axle side up).

2. Lay the kingpin seal into the bore of the steering knuckle. The seal lip should face out-

ward or toward the axle.

3. Use a bushing driver tool and press seal firmly into the steering knuckle assembly.

4. Install the kingpin seal until it makes contact with the kingpin bushing, see Figures

9-72 and 9-73.

SERVICE MANUAL

131

FRONT AXLE & SUSPENSION

APPENDIX