Bendix Commercial Vehicle Systems EB/ES BRAKES SERVICE MANUAL - Manual (Page 35)

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Figure 38. Camshaft Radial Play Inspection Figure 39. Camshaft Inspection
Inspection
Inspection
Camshaft Radial Play Inspection
Camshaft radial play should be checked any time the brake shoes
have been removed from the vehicle. Refer to Figure 38.
1. Mount a suitable dial indicator with plunger referencing cam head
at roller contact area.
2. Zero dial indicator.
3. Move cam head up and down and note maximum reading.
4. If play exceeds 0.035" (0.91 mm), rebush air chamber bracket. See
Repair/Replacement - Camshaft Bushing and Grease Seal
Replacement.
NOTE: For Trailer Axle Brakes, rebush spider and/or replace support
bushing assembly at brake adjuster. See Repair/Replacement -
Camshaft Bushing and Grease Seal Replacement.
5. After rebushing, recheck radial play. If still excessive, replace
camshaft.
Camshaft Inspection
1. Refer to Figure 39. Check spline end for cracks, worn or
deformed splines. Replace as necessary.
2. Check camshaft bushing journals for wear and corrosion.
Replace camshaft if it shows visible wear or if roughness is felt in
journal areas.
3. Inspect camshaft head for brinelling, cracking or fl at spots.
Replace camshaft if a ridge can be felt between worn areas and
cam head surface.
Camshaft Bushing and Seal Inspection
NOTE: Steer and drive axle camshaft bushings and seals are
mounted in the air chamber bracket assembly.
1. Check bushing for deterioration or wear. Inner surface must
be smooth. If surface is rough or abrasive, replace bushing, see
Repair/Replacement - Camshaft Bushing and Grease Seal
Replacement.
2. Inspect grease seals. Replace if seal lip is nicked, cut or
distorted. See Repair/Replacement - Camshaft Bushing and
Grease Seal Replacement.