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Bendix

Double Anchor Pin Cam Brake

SD-22-3260

FIGURE 1

GENERAL DESCRIPTION

The Bendix 16-1/2” x 7” double anchor pin cam brake is

designed for use on heavy duty highway vehicles. It is a

mechanically actuated, leading /trailing shoe brake with a

fixed position cam and anchors.

The brake consists of two fabricated steel shoe assemblies

individually anchored to a cast iron torque spider and

actuated by a single forged cam shaft. Two retaining springs

secure the shoe assemblies to their respective anchor pins.

The twin webs of each shoe assembly engages the anchor

pin on one end and the cam roller on the other. A single

shoe to shoe return spring is used to maintain constant

contact between the shoe, cam roller and cam.

OPERATION

The Bendix cam brake operates in the following manner

during a braking application. The force of the push rod of

the actuator is converted from a linear force to a rotary

torque. This is accomplished by use of the slack adjuster.

This torque is transferred to the cam shaft of the foundation

brake due to the spline of the cam shaft being connected to

the gear of the slack adjuster. On the opposite end of the

cam shaft is the S-Cam which when rotated lifts the cam

rollers. This spreads the brake shoe ends apart and pivots

the shoes about the anchor pin so the brake lining comes

in contact with the rotating brake drum. The friction created

by the lining pressure against the drum generates the torque

necessary to provide a retarding force to slow down the

vehicle. The energy of the vehicle in motion is converted to

heat at the surface of the drum and lining. The heat raises

the temperature of the drum. The heat is stored in the drum

and finally dissipated to the air.

1 2 3 4 5 6 ... 11 12

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Strany 1 - Double Anchor Pin Cam Brake

1®Bendix® Double Anchor Pin Cam BrakeSD-22-3260FIGURE 1GENERAL DESCRIPTIONThe Bendix 16-1/2” x 7” double anchor pin cam brake isdesigned for use on he

Strany 2 - Key No. Description Qty

10BRAKE SHOE AND LINING TROUBLESHOOTING CHARTSYMPTOM CAUSE REMEDY1. Poor lining to drum A. Bell-mouth drum. A. Replace part.contact. B. Bent brake spi

Strany 3 - INJURY OR DEATH:

118. Loose lining. A. Improper size rivets (too long, too A. Re-rivet.short, improper diameter).B. Improper crimping of rivet. B. Re-rivet.C. Enlarged

Strany 4

Strany 5

2FIGURE 2 - 16-1/2” DOUBLE ANCHOR PIN S-CAM BRAKE1617143018151319891326252411109871243651220212322Key No. Description Qty.1 Snap ring 12 Spacer washer

Strany 6 - ASSEMBLY (SEE FIGURE 2)

3PREVENTIVE MAINTENANCE1. BRAKE ADJUSTMENTWeekly, or whenever push rod stroke exceeds maximumdistance listed on the following chart. For completeadjus

Strany 7

4FIGURE 5 - REMOVING SHOESFIGURE 4 - REMOVING SHOE RETURN SPRINGFIGURE 7 - REMOVING ACTUATOR BRACKETFIGURE 6 - REMOVING SLACK ADJUSTERPREPARATION1. Pa

Strany 8

5DISASSEMBLY (See Figure 2)1. Insert a sturdy lever between one of the shoes and thecam shaft housing. Pry shoe away from cam roller untilpin and roll

Strany 9

6FIGURE 9 - SEAL INSTALLATIONSLACK ADJUSTER END.094”NOTE: BOTH LIP SEALS POINT THE SAME DIRECTION LIPTOWARD SLACK ADJUSTERLIP SEALFIGURE 8 - CHECKING

Strany 10

7FIGURE 10USE RIVETS OF CORRECT LENGTH AS SHOWNCORRECTTOO LONGTOO SHORTCAUTION: The lip of the grease seals must be installedcorrectly to prevent poss

Strany 11

8prevent the initial rusting problem. Before riveting, clamp theblocks tightly to the shoe, placing the clamps close to therivet holes. Be sure the ho

Strany 12

9FOUNDATION BRAKE TROUBLESHOOTING CHARTSYMPTOM CAUSE REMEDY1. Degraded brake A. Too much push rod free travel. A. Adjust brakes.performance. B. Severe

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