MCi Crusader II 1989 Maintenance Manual page 161

Date
1-1-89
Page __
4_-3_1 - -
MC-9 MAINTENANCE MANUAL
5.38" (136.65 mm)*
,..... _ _ .,. 2.50" (63.50 mm)**
-MOUNTING
BRACKET
FRONT AXLE
REAR DRIVE AXLE
3.00"- 76.2
mm
I
TRAILING AXLE
98.5 mm
* On the earlier I-beam type front axles
0
On the later hollow tube type front axles
Figure 4-37. Push Rod Adjustment, Automatic and Standard
Slack Adjusters.
NOTE: The angle formed by the slack
adjuster arm and brake chamber push rod
should be 90 to 120 degrees.
11.
As a final installation check. remove the clevis pin and
manually push the slack adjuster into the clevis pin and release
it
Upon return. the adjuster is installed correctly if the adjuster
hole and clevis pin hole are in alignment. Secure all fasteners.
NOTE: Step 12 is not necessary if adjuster
final check (step 11) was satisfactory.
12. If holes do not align (step 11). place clevis pin through
holes. Loosen the control arm fasteners and
move
the control
arm toward the brake chamber until it comes to a de.finite stop.
Tighten the bracket fasteners and repeat step 11.
BRAKES
The brakes used on the coach are heavy duty, double-shoe.
Shoes are mounted with individual anchor pins on open-type
spiders. The brakes are actuated by "S" type. constant lift cams
which are forged integral with the shaft and mounted in needle
bearings. Cam pressure is applied through roller cam followers
attached to the brake shoes.
MAINTENANCE
A schedule for the periodic adjustment. cleaning, inspection.
and lubrication of brake equipment should be established by
the operator on the basis of parts particularly subject to wear.
To compensate for this wear. brakes should be adjusted as
frequently as required to maintain satisfactory operation and
maximum safety. Adjustments should provide uniform lining
clearance. correct travel of levers and proper equalization.
Brakes should be cleaned. inspected. lubricated and
adjusted each time the hubs are removed.
Machining of brake drums is permitted under the following
guideline.
Original Diameter 14.50" (368.3 mm)
Max. Allowable Wear 14.812" (376.2 mm)
Under no circumstances should braked rums be used if they
have been machined to a greater dimension than allowed
(14.812" -376.2 mm).
WARNING: When refaced drums and over-
size linings are used, precautions regard-
Ing cam travel should be observed to pre-
vent sticking cams or cam "roll over." This
condition may occur when linings become
wom beyond allowable llmlts. Service
instructions relative to the use of oversize
roller cam followers must be carefully fol-
lowed. Drums which have been refaced
should be installed on coaches operating
under the least severe conditions.
Linings vary considerably in size and content They should
be replaced only with linings available in the Parts Manual.
DISASSEMBLY
Brake parts are shown in figures 4-38, 39 and 40.
1. Remove the wheels as outlined in Section 15.
2. Remove tt,e shoe return spring. Remove lock rings.
retainers. and felts from anchor pins
3. Cut lock wire and remove anchor pin lock screws.
4. Remove anchor pins and shoe assemblies.
5. Loosen Allen screws and remove roller cam followers and
pins. Remove slack adjuster.
6. Remove lock ring or loosen lock screw in spacer and
remove camsha~
7. Wire the spacers to the brake spider.
8. Remove washer and felts from cam shaft and spider.
9. Remove bushings from shoe of bearings and from spider
as required.