MWO-9-2320-272-24-1

MWO 9-2320-272-24-1

1. PURPOSE.

The purpose of this modification is to improve operational safety of the vehicle by installation of a

redesigned spring brake valve and mounting bracket.

2. PRIORITY.

a. This modification is classified as

LIMITED URGENT

as a result of an Operational Safety of

Use/Flight Message: 021900 Z Oct 87 Control Number 87-62. Operating

restrictions provided therein remain in effect until this modification is applied.

b. Equipment in use (includes equipment in supply or maintenance activities below depot level and

equipment in administrative storage). Equipment in use will be modified as soon as practical, but not later

than the scheduled completion date. Equipment not modified after expiration date of the MWO will be

administratively deadlined and not used until modification is complete in accordance with (IAW) AR 385-55

and DA PAM 738-750.

c. Equipment in wholesale supply, depot supply, or maintenance activities. All MWOs, including those

in Depot Maintenance Work Requirements (DMWRs), will be accomplished on serviceable materiel prior to

issue and/or subsequent scheduled completion date. Project stock stored at depots will be modified

concurrently with depot stock. Issue of unmodified materiel is prohibited. The MWO will be applied to

unserviceable materiel during scheduled depot maintenance.

d. Prepositioned stock. Equipment which is prepositioned will be modified during cyclic maintenance

and will be consistent with TM 38-450.

3. END ITEM TO BE MODIFIED.

a. Truck, 5-ton, 6x6, M939 and M939A1 Series.

NOMENCLATURE

NSN

PART NO.

FSCM

MODEL

SERIAL

NO.

Truck, Cargo

Truck, Dump

Truck, Tractor

8736986-2

8750151

8736986-1

8750152

8736987-2

8750155

8736987-1

8750156

8736989-2

8750157

8736989-1

8750158

8736990-2

8750159

8736990-1

8750160

19207

M923

M923A1

M925

M925A1

M927

M927A1

M928

M928A1

M929

M929A1

M930

M930A1

M931

M931A1

M932

M932A1

All

MODIFICATION OF 5-TON M939 AND M939A1 SERIES TRUCKS

SPRING BRAKE CONTROL VALVE IMPROVEMENT; MODIFICATION WORK ORDER

JULY 1992

MWO-9-2320-272-24-1 - Page 2 of 25

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MWO-9-2320-272-24-1

MODIFICATION OF 5-TON M939 AND M939A1 SERIES TRUCKS

SPRING BRAKE CONTROL VALVE IMPROVEMENT; MODIFICATION WORK ORDER

JULY 1992

MWO-9-2320-272-24-1 - Page 2 of 25