MWO-9-2320-272-35-1
MODIFICATION OF 5-TON M939, M939A1, M939A2 SERIES FAMILY OF VEHICLES (FOV)
M939 BRAKE STABILIZATION PROGRAM (RETROFIT OF ANTI-LOCK BRAKE SYSTEM (ABS) FOR M939 FOV); MODIFICATION WORK ORDER
JANUARY 2007
CHANGE 1
MWO-9-2320-272-35-1 - Page 17 of 109
MWO 9-2320-272-35-1
15
(57)
Route existing green tube from old doublecheck valve No. 1 (figure 15), to doublecheck valve
No. 6 as shown in figure 17 or 18.
(58)
Cut green tube to fit and connect to tee (WBPDVS271NTA-6-6) on doublecheck valve No. 6 with
sleeve and nut as shown in figure 17 or 18.
(59)
Install WBPD62NTA-8 union in right side glad hand tube as shown in figure 21.
(60)
Install WPFT-8B-500 tube on union (WBPD62NTA-8) with sleeve and nut as shown in figure 21.
Route tube towards rear to doublecheck valve No. 6 and connect to elbow (WBPDVS269NTA-8-6)
with sleeve and nut as shown in figure 17 or 18.
WARNING
WARNING
Do not apply MWO 9-2320-272-20-7 to any vehicle after
this MWO has been installed. Failure to comply may
result in injury to personnel.
(61)
Remove two nuts, washers, screws, washers, and front limiting valve from bracket as shown in
figure 22, or quick-release valve as shown in figure 23, if MWO 9-2320-272-20-7 was applied,
remove four tubes from valve.
NOTE
NOTE
Kit 1 will be supplied with either a LQ-2 valve or a front
limiting valve as shown in figure 24.
(62)
Connect four existing tubes to PPS5007510 LQ-2 or WCDFAPL-100 valve as shown in figure 24.
NOTE
NOTE
It may be necessary to relocate valve or adjust tube
lengths for installation.
(63)
Install LQ-2 valve (PPS5007510) or front limiting valve (WCDFAPL-100) on existing bracket
with two screws, washers, and nuts as shown in figure 24. Install WTS800UVBK tiedown straps
as necessary as shown in figure 24.
(64)
Locate existing union tee mounted on step brace on driver’s side forward of fuel tank as shown
in figure 25.
(65)
Disconnect existing tube from 45° elbow on union tee and remove 45° elbow and bushing from
union tee as shown in figure 25.
(66)
Install WBPDVS216P-8-6 reducer and WHMBN20954A doublecheck valve No.7 in existing
union tee as shown in figure 26. Tighten valve so that two inlet ports are vertical as shown in
figure 26.
(67)
Install WBPDVS269NTA-8-6 elbow in bottom port of doublecheck valve No. 7 with opening of
elbow facing rearward as shown in figure 26.
(68)
Install WBPDVS68NTA-6-6 connector in open port on doublecheck valve No. 7 as shown in
figure 26.
(69)
Connect existing tube to elbow (WBPDVS269NTA-8-6). Install WPFT-6B-500 6 ft tube in adapter
(WBPD68NTA6-6) on doublecheck valve No. 7 with sleeve and nut as shown in figure 26.
(70)
Remove existing red tube and fitting from lower secondary air tank tee as shown in figure 27.
(71)
Install WBPDVS269NTA-6-8 elbow on tee at lower secondary air tank as shown in figure 28.
Position elbow facing up.
(72)
Route 6 ft tube (WPFT-6B-500) from doublecheck valve No. 7 (figure 26) over to lower secondary
air tank and connect to elbow (WBPDVS269NTA-6-8) with sleeve and nut as shown in figure 28.
(73)
Remove hose and elbow from upper primary air tank tee as shown in figure 29. Retain elbow for
installation on M939/A1 vehicles except LWB and wrecker.
(74)
Install WBPDVS224P-8 tee on upper primary air tank tee as shown in figure 30.
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