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 22 of 109
MWO 9-2320-272-35-1
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(132)
Install WHMB50011F air dryer on air dryer mounting bracket with four WSH3-8-24X125G8
screws, eight WWF3-8 washers, and four WNHL3-8-24G8 locknuts as shown in figure 52.
Ensure inlet port is facing towards passenger side frame rail. Tighten locknuts 30-45 lb-ft.
NOTE
NOTE
Perform steps 133 and 134 for M936/A1/A2 vehicles.
(133)
Position WHMB50011G air dryer on outside passenger side frame rail as shown in figure 53.
Locate, mark, and drill four 25/64-in. diameter holes in frame rail as shown in figure 54.
(134)
Install air dryer (WHMB50011G) on passenger side frame rail with four WSH3-8-24X150G8
screws, eight WWF3-8 washers, and four WNHL3-8-24G8 locknuts as shown in figure 53.
Tighten locknuts 30-45 lb ft.
(135)
Install WBPDVS68NTA-8-8 connector in inlet port on wet tank fitting as shown in figure 55.
(136)
Install WPFT-8B-500 tube on air dryer outlet port elbow and inlet port connector on wet tank
with two sleeves and nuts as shown in figures 53 and 55.
(137)
Route and install new air dryer hose on inlet port elbow at air dryer as shown in figure 53 or 55.
NOTE
NOTE
Perform steps 138 and 139 for M939/A1 vehicles.
(138)
Install WPFT-4A-1000 tube on air dryer control port elbow with sleeve and nut as shown in
figures 53 and 55.
(139)
Route tube (WPFT-4A-1000) from air dryer control port, back through crossmember to driver’s
side frame rail, along frame rail until it reaches hose (WHRHTH-1-4-96) installed on governor
(figure 47). Install WBPD66NTA-4-2 connector and tube (WPFT-4A-1000) on hose
(WHRHTH-1-4-96) with sleeve and nut as shown in figure 47.
NOTE
NOTE
Perform steps 140 through 143 for M939A2 vehicles.
(140)
Remove existing control port hoses from tee on expello valve at wet tank as shown in figure 56.
(141)
Remove expello valve from wet tank tee and install WTFD1-4HHPBV plug in wet tank tee as
shown in figure 56.
(142)
Connect existing control port hoses together using WBPD42F-4 union as shown in figure 56.
(143)
Install existing control port hose on air dryer control port elbow as shown in figures 53 and 55.
NOTE
NOTE
Perform step 144 for M936/A1/A2 vehicles.
(144)
Install tube and air dryer hose on rear lower leg of wet tank support U-bolt with
WCND1-2X3-8 clamp, WCND7-8X3-8 clamp, WWF3-8 washer, and WNHL3-8-24G8 locknut as
shown in figure 53.
(145)
Locate, mark, and drill 1.500-in. diameter hole in firewall above upper mounting bolt for vehicle
power control box in engine compartment as shown in figure 57. Remove burrs from hole.
NOTE
NOTE
When attaching loom connector to ECU, ensure both sides
of the connector “Click” onto the ECU. When properly
seated, the loom connector will not move.
(146)
Attach WHMB300561MB loom to ECU. Connector is keyed so that it can only attach in one
direction. Push connector on ECU with even force so that both clips on sides click
simultaneously when seating connector onto ECU. Secure connection by closing spring clip and
latching attached clasp over harness connector as shown in figures 34 and 58.
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