Bendix Commercial Vehicle Systems BEPA (FORD) 15X4 CAM BRAKE 5/09 - Manual (Page 5)

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7. Remove snap ring and washer from splined end of
cam shaft. Remove slack adjuster from cam shaft. (A
puller may be required.) Remove spacers and the thick
washer from cam shaft. (See Figure 6)
8. Remove cam shaft from actuator bracket and cam
tube.
9. Mark and remove the dust shields from the spider
by removing the six cap screws using a 3/8" socket.
Do not remove unless there is apparent damage
(See Figure 7).
10. Remove the actuator bracket and cam tube from
the spider by removing the four cap screws and
lockwashers using a 3/4" socket.
11. Remove and discard the two cam shaft grease seals.
One at each end of the cam tube.
12. Remove and discard the two cam shaft bushings
located in the same area as the seals in Step 11. Use a
tool of proper diameter and length to drive the bushings
out from the backside. NOTE: Prior to removal see the
“Inspection of Parts” section, Step 1B.
13. To facilitate assembly, note or mark the relationship
of the spider to the axle (driver or curb side) and the
orientation on the axle fl ange. Remove the spider from
the axle fl ange by removing the fi ve bolts, nuts, and
lockwashers and the nuts and lockwashers from the
three studs. NOTE: If the spider is to be reused and
there is damage to any of the three studs, they may be
pressed out of the spider and replaced with grade 8,
5/8" bolts.
CLEANING OF PARTS
After disassembling the foundation brake, wash the metallic
components in mineral spirits and wipe dry. Be careful not
to get any foreign material, especially grease on the brake
shoes or interior of the brake drum. Use a wire brush to
remove heavy contamination from the spider and outside
of the brake drum.
INSPECTION OF PARTS
1. ACTUATOR BRACKET AND CAM TUBE
A. Check assembly for bent actuator bracket and
broken or cracked cam tube welds.
B. Inspect cam shaft bushing for signs of wear. Bearing
surfaces should be smooth and free of any pitting or
fractures. Insert cam shaft and measure looseness
at both ends with a dial indicator. If more than .020"
movement is noted, replace bushings and/or cam
shaft. NOTE: If it is determined that a bushing
requires replacement, both cam shaft bushings
should be replaced.
2. CAM SHAFT
A. Inspect cam shaft spline for cracks and excessive
deformation. Replace as necessary.
B. Inspect the cam shaft bearing journals for wear or
corrosion. If the shaft shows wear or roughness that
is visible or roughness that can be detected by feel,
it must be replaced.
C. Inspect cam head for cracks, and its roller surfaces
for fl at spots, brinneling, or ridges. Note unusual
wear patterns which may indicate an out-of-square
condition. Replace if any of these conditions
exist.
3. SPIDER
A. Inspect for cracked or broken surfaces on the
spider at the cam, anchor pin, and mounting bolt
holes. Replace any spider with visible damage. Do
not attempt to weld or repair. Check fi t of anchor
pin in torque spider. Radial clearance in excess of
.010" indicates excessive wear. Replace anchor pin
and/or torque spider.
4. ROLLERS AND PINS
A. Inspect rollers and pins for fl at spots, galling, broken
or cracked surfaces. Replace as necessary.
5. ANCHOR PIN
A. Inspect anchor pin for worn, broken or cracked
surfaces. Replace as necessary.
6. SHOES AND LINING
A. Check shoes for bent shoe webs, cracks in shoe
table welds or webs, and elongated rivet holes.
Replace shoes if any of these conditions exist.
B. Measure the shoe span by loosely installing the
anchor pin and cam roller in the appropriate ends of
the shoe web. If the distance from center of anchor
pin to center of cam roller exceeds 11.78" replace
shoe.
C. Check linings. Replace when any of the following
conditions exist:
1. Lining thickness at thinnest point is 1/4" or
less.
2. Linings are cracked or worn in an unusual or
odd pattern, i.e., lining wear tapered from side
to side across shoe table. Unusual wear patterns
can indicate damage to foundation brake parts.
3. Rivet holes are elongated in lining or shoes.
4. Lining is oil soaked.
5. Linings can be moved by hand, i.e.; loose
rivets.