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 16 of 109
MWO 9-2320-272-35-1
14
(39)
Remove nut, screw, and doublecheck valve No. 1. from driver’s side frame rail as shown in
figure 15. (Refer to TM 9-2320-272-24.)
(40)
Remove all fittings from doublecheck valve No. 1 except 1/2-in. adapter as shown in figure 16.
Shake valve and listen for unobstructed movement of shuttle inside valve, clean or replace if
obstructed.
(41)
Enlarge mounting hole on doublecheck valve No. 1 to 3/8 inch as shown in figure 16.
(42)
Install WBPDVS2202P-6-6 elbow in outlet port of existing doublecheck valve No. 1. Install
WBPDVS271NTA-6-6 tee on elbow WBPDVS2202P-6-6. Install WBPDVS269NTA-8-6 elbow on
doublecheck valve No. 1 as shown in figure 16. This valve is now used as doublecheck valve No. 6.
NOTE
NOTE
Perform step 43 for M939A2 vehicles. Perform step 44 for
M939/A1 vehicles.
(43)
Install doublecheck valve No. 6 on existing L-shaped bracket on driver’s side frame rail just
below cab with existing screw, washer, and nut as shown in figure 17.
(44)
Remove rear nut and screw from front step brace bracket as shown in figure 18. Install
doublecheck valve No. 6 to inside of driver’s frame rail with existing screw, WWF3-8 washer,
and WNHL3-8-24G8 locknut as shown in figure 18.
(45)
Disconnect and remove red tube that was connected to tee on doublecheck valve No. 2 or 5 as
shown in figure 6 or 7, and remove tube and adapter from secondary delivery foot valve hose at
transition from red tube to hose. Route hose forward along frame rail to approximate location
from where doublecheck valve No. 1 was removed as shown in figure 15.
(46)
Install WBPDVS269NTA-6-6 elbow on top port on WBPD2205P-6 cross tee with elbow facing
rear as shown in figure 19. Install WBPDVS269NTA-6-6 elbow on bottom port on cross
tee (WBPD2905P-6) with elbow facing rear. Install WBPDVS68NTA-8-6 connector on cross tee
(WBPD2205P-6) as shown in figure 19.
(47)
Install hose from foot valve to open port on cross tee (WBPD2205P-6) at old doublecheck valve
No. 1 location as shown in figure 20.
(48)
Connect existing tube from front quick-release valve to adapter (WBPDVS68NTA-8-6) on cross
tee (WBPD2205P-6) as shown in figure 20.
(49)
Route WPFT-6B-500 tube from doublecheck valve No. 2 or doublecheck valve No. 5
(M931/M932) forward to cross tee (WBPD2205P-6) as shown in figures 7 or 8 and 20.
(50)
Connect tube (WPFT-6B-500) to elbow (WBPDVS269NTA-6-6) on doublecheck valve No. 2 or
doublecheck valve No. 5 (M931/M932) with sleeve and nut as shown in figure 7 or 8.
(51)
Connect other end of tube (WPFT-6B-500) to top elbow (WBPDVS269NTA-6-6) on cross tee
(WBPD2205P-6) with sleeve and nut as shown in figure 20.
(52)
Install WPFT-6B-500 tube on BAL port connector on inversion valve (WHMBN50002B) with
sleeve and nut as shown in figure 14. Route tube to doublecheck valve No. 6 as shown in
figure 17 or 18. Connect tube to top of tee (WBPDVS271NTA-6-6) on doublecheck valve No. 6 as
shown in figure 17 or 18.
(53)
Install WPFT-6B-500 tube on control port elbow on inversion valve (WHMBN50002B) with
sleeve and nut as shown in figure 14. Route tubing forward to cross tee (WBPD2205P-6) and
connect to bottom elbow (WBPDVS269NTA-6-6) with sleeve and nut as shown in figure 20.
(54)
Install existing cover on driver’s step box with eight existing washers and screws as shown in
figure 9.
(55)
Route existing hose from old doublecheck valve No. 1 figure 15, back to doublecheck valve No. 6
as shown in figure 17 or 18.
(56)
Connect existing hose to 1/2 in. adapter on doublecheck valve No. 6 as shown in figure 17 or 18.
Back to Top
