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BENDIX DD-3-SD-3 SAFETY ACTUATORS Manual

Safety actuators
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®
Bendix
DD-3
®
™
SERVICE
DIAPHRAGM
AUXILIARY
DIAPHRAGM
RETURN
SPRING
REAR
SEAL
FIGURE 1 - DD-3
SAFETY ACTUATOR
™
FIGURE 2 - SD-3
SAFETY ACTUATOR
™
& SD-3
Safety Actuators
™
PUSH PLATE
SEPARATOR
& SHAFT
ASSY.
EXHAUST
DIAPHRAGM
LOCKING
PISTON
O-RING
LOCKING
PISTON
CAP O-RING
ROLLER SPRING
FRONT SEAL
ROLLERS (8)
SPLASH PLATE
GASKET
SERVICE PORT
EMERGENCY
PORT
SERVICE PORT
DRAIN SLOT
LOCKING PORT
LOCKPORT
DRAIN SLOT
1

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Summary of Contents for BENDIX DD-3-SD-3 SAFETY ACTUATORS

  • Page 1 ® Bendix DD-3 & SD-3 Safety Actuators ® ™ ™ PUSH PLATE LOCKPORT SERVICE SEPARATOR & SHAFT DIAPHRAGM LOCKING DRAIN SLOT ASSY. PISTON O-RING AUXILIARY LOCKING DIAPHRAGM PISTON CAP O-RING EMERGENCY PORT SERVICE PORT ROLLER SPRING FRONT SEAL RETURN SPRING...

  • Page 2: Normal Running

    DESCRIPTION OPERATION - DD-3 ACTUATOR (FIG. 1) - ™ NORMAL RUNNING The DD-3 ™ and SD-3 ™ are air operated actuators with a For normal operation full reservoir pressure is applied mechanical push shaft lock. The DD-3 actuator (see Fig. ™...

  • Page 3: Removing And Installing

    Various control systems are used to achieve the proper REMOVING DD-3 ACTUATOR ™ sequence of control signals. Bendix brochure “Off Highway Vehicle Braking System” (BW 1283) explains one such With the actuators in a released position, disconnect the system. air lines to the service and auxiliary ports. Move the park...

  • Page 4: Cleaning And Inspection

    5. Spread clamping rings slightly, just enough to slip rings collar bores in the non- pressure plate. The air passage off plates, It may be necessary to use a soft mallet to from the lock port to piston bore should be checked for break the clamping rings loose.
  • Page 5 OPERATING - DD-3 ACTUATOR ™ to the nearest Bendix authorized distributor for a factory With the actuator in the released position, make several reconditioned actuator under the repair exchange plan. If brake applications and note that actuators apply and release this is not possible, the actuator can be repaired with genuine properly.
  • Page 6 ANY work on the BW1563 © 2004 Bendix Commercial Vehicle Systems LLC. All rights reserved. 4/2004 Printed in U.S.A.

This manual is also suitable for:

Dd-3Sd-3