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 18 of 109
MWO 9-2320-272-35-1
16
NOTE
NOTE
• Perform step 75 for M939/A1 vehicles except LWB and
wrecker. Perform step 76 for M939A2 vehicles, LWB,
and wrecker.
• It may be necessary to relocate valve or adjust tube
lengths for installation.
(75)
Install WBPDVS269NTA-8-8 elbow and existing elbow (from step 74) on upper primary air tank
tee (WBPDVS224P-8) as shown in figure 30.
(76)
Install WBPDVS269NTA-8-8 elbow and WTFD8-8FTXSV connector on upper primary air tank
tee (WBPDVS224P-8) as shown in figure 30.
(77)
Remove front relay valve (figure 31), (refer to TM 9-2320-272-24). Install WTFD8CTXSV elbow
in delivery port No. 2 on WHMB400211HB front relay valve w/ECU with elbow facing away
from mounting bracket as shown in figure 32.
(78)
Install WBPDVS269NTA-6-6 elbow in control port No. 4 on front relay valve w/ECU
(WHMB400211HB) with elbow facing up as shown in figure 32.
(79)
Install WBPDVS269NTA-8-8 elbow in supply port No. 1 on front relay valve w/ECU
(WHMB400211HB) with elbow facing away from elbow (WBPDVS269NTA-8-6) as shown in
figure 32.
(80)
Install WTFD8FTXSV connector in other port No. 2 on front relay valve w/ECU
(WHMB400211HB) as shown in figure 32.
(81)
Install WBPDVS269NTA-6-6 elbow on control port No. 4 on WHMB400211HA rear relay valve
with elbow facing up as shown in figure 33.
(82)
Install WBPDVS68NTA-8-8 connector on supply port No. 1 on rear relay valve
(WHMB400211HA) as shown in figure 33.
(83)
Install WTFD8CTXSV elbow on delivery port No. 2 on rear relay valve (WHMB400211HA) with
elbow facing the same as connector (WBPDVS68NTA-8-8) as shown in figure 33.
(84)
Install WTFD8FTXSV connector on other delivery port No. 2 on rear relay valve
(WHMB400211HA) as shown in figure 33.
(85)
Install front relay valve w/ECU (WHMB400211HB) on existing bracket with two WWF3-8
washers and WNHL3-8-24G8 locknuts as shown in figure 34. Tighten locknuts 30-45 lb-ft.
NOTE
NOTE
If necessary, shorten existing red supply tube and install
with new sleeve and nut.
(86)
Connect existing red supply tube to port No. 1 elbow on front relay valve w/ECU
(WHMB400211HB) as shown in figure 34.
(87)
Install existing hose from front rear axle manifold to port 2 elbow on front relay valve w/ECU
(WHMB400211HB) as shown in figure 34.
(88)
Install existing hose from manifold on frame rail to port 2 connector on front relay valve w/ECU
(WHMB400211HB) as shown in figure 34.
(89)
Locate existing green tube running along driver’s side frame rail through crossmember to
existing tee across from rear relay valve (WHMB400211HA). Cut tube approximately 3 inch
forward of crossmember as shown in figure 35.
(90)
Install WBPD264NTA-6 tee on existing green tubes with two sleeves and nuts as shown in
figure 35.
(91)
Install WPFT-6B-500 tube on tee (WBPD264NTA-6) with sleeve and nut and other end of tube
in port No. 4 elbow on front relay valve w/ECU (WHMB400211HB) with sleeve and nut as shown
in figures 35 and 34.
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