Disarming Introduction

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SEALED BRAKE INSTALLATION AND SERVICE (Cont)

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TM-9-2330-326-14-P Semitrailer Tactical Drop Deck BreakBulk/Container Transporter 22-1/2 TON M871A3NSN 2330-01-458-6865 Manual

Supplementary Information

TM 9-2330 -326 -14&P

H-20.

SEALED BRAKE INSTALLATION AND SERVICE (Cont.)

Disarming Introduction

The proper disposal of old spring brake chambers is a concern of commercial industry and should

be a concern of all maintenance shops. ALL retired spring brak e chambers (actuators) must be

safely disarmed before they are disposed of to prevent serious personal injury from accidental

sudden release of the high -energy spring (as much as 2700 pounds [12,010 Newtons]) in the

parking chamber.

It is recommended that the coils of the power spring be cut with an acetylene gas torch prior to

disposal. This simple procedure renders the power spring inoperable, permitting the chamber to

be safely discarded.

Reference the attached drawing with material list for fabrication of the Spring Brake Disarming

Chamber as engineered by Lear Siegler Truck Products Corporation.

WARNING

Spring air brake chambers should never be rebuilt. Never

attempt to loosen or remove the housing retaining clamp(s)

bolts or repair the chamber in any way. Serious injury or death

will occur.

This disarming chamber is to be fabricated at the Direct

Support or higher Level.

An annual inspection of this disarming chamber will be

accomplished at the DOL or Depot Level QA/QC as in the

case for tire cage s.

DOL will certify inspection of the disarming chamber by

stamping or applying data plate.

There will be NO substitution of ANY materials used to

fabricate

this

chamber.

Materials

and

welding

standard/locations specified on the drawing are to be used

in this fabrication. This is a safety device.

Never operate an acetylene gas torch without wearing proper

clothing and eye protection.

Disarming Instructions

Place the single/piggyback or combination/tandem spring brake chamber in the

fabricated/inspec ted disarming chamber. Air brake chamber should be uncaged with caging

bolt removed.

Position the air brake chamber so the spring brake head can easily be accessed through the

slots in the disarming chamber. If the air brake chamber does not fit in the disarming

chamber it may be necessary to cut off the service push-rod. Close the hinged access door

of the disarming chamber and lock hasps with bolts and nuts.

H-52