MWO 5-2330-360-23-1
10. MODIFICATION PROCEDURE FOR M870 BRAKE (BENDIX) (Continued).
(2) Check brake chamber push rod for proper length as follows:
Refer to Figure 18.
(a) With the brake chamber in the released position (cage if necessary), place a square (or equivalent object) so
that one edge is parallel with the brake chamber push rod and the other edge is against the camshaft.
(b) Measure the gap from the end of the brake chamber push rod to the vertical edge of the square.
(c) If the gap measurement is less than 2-11/16 inches, the push rod must be shortened. If the
(d)
Figure 19.
Refer to Figure 19.
(d) Position the brake chamber push rod locknut approximately 1-5/16 inches from the threaded end. Thread the
clevis adapter on the push rod to about 3/8-inches from threaded end.
(e) Install Automatic Slack Adjuster-5 (ASA-5) on the brake camshaft. Reuse retaining ring set aside during slack
adjuster removal.
Refer to Figure 20.
(f) Turn ASA-5 adjustment hex clockwise until clevis adapter extends into threaded bore of clevis approximately
1/8-inch. Thread adapter into clevis and tighten snug.
(g) Place square or other suitable straight edge so that one edge of square is parallel with brake chamber push rod
and the other edge is against the outer edge of the camshaft.
(h) Measure the gap measurement between the outside of camshaft and the center of clevis pin. The distance
shall be not less than 1-1/2-inches, nor more than 2-3/4-inches.
(i) Torque clevis adapter to 10 pound-feet (14 Newton Meters). Run push rod locknut down against clevis adapter.
Hold adapter with wrench and tighten locknut to 34 - 50 pound-feet (45 - 67 Newton
Meters).
Figure 20.
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