TM-9-2320-272-23-3

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 3 OF 5

SEPTEMBER 2012
TM-9-2320-272-23-3

  TM-9-2320-272-23-3 - Page 885 of 1469

INSTALLATION
NOTE
•
If new brake LQ-2 valve is being installed, use attaching parts and fittings from old
brake
valve.
•
Perform Steps (1, 2, and 9) only if an early LQ-2 valve is being installed.
•
Optional Front Limiting Valve is supplied with all necessary hardware. Discard all unused
hardware if an optional Front Limiting Valve is used to replace an LQ-2 valve.
•
Fittings must be cleaned and inspected for cracks and stripped threads.
•
Apply sealant to all male pipe threads before installation.
1.
Install tee fitting (Figure 2, Item 12) on bottom of brake LQ-2 valve (Figure 2, Item 20).
2.
Install adapters (Figure 2, Items 11 and 13) on tee fitting (Figure 2, Item 12).
3.
Install adapters (Figure 2, Items 4 and 15) on sides of brake LQ-2 valve (Figure 2, Item 20).
4.
Install elbows (Figure 2, Items 1 and 21) on top of brake LQ-2 valve (Figure 2, Item 20).
5.
Install brake LQ-2 valve (Figure 2, Item 20) on bracket (Figure 2, Item 9) with two screws (Figure 2, Item 2),
washers (Figure 2, Item 3), and locknuts (Figure 2, Item 8).
6.
Install air line (Figure 2, Item 6) on adapter (Figure 2, Item 4) of brake LQ-2 valve (Figure 2, Item 20) and
tighten nut (Figure 2, Item 5).
7.
Install air line (Figure 2, Item 17) on adapter (Figure 2, Item 15) of brake LQ-2 valve (Figure 2, Item 20) and
tighten nut (Figure 2, Item 16).
8.
Install air line (Figure 2, Item 18) on adapter (Figure 2, Item 13) of tee fitting (Figure 2, Item 12) and tighten
nut (Figure 2, Item 14).
9.
Install air line (Figure 2, Item 7) on adapter (Figure 2, Item 11) of tee fitting (Figure 2, Item 12) and elbow
(Figure 2, Item 21) on brake LQ-2 valve (Figure 2, Item 20) and tighten nuts (Figure 2, Items 10 and 24).
10.
Install air line (Figure 2, Item 22) on top elbow (Figure 2, Item 1) of brake LQ-2 valve (Figure 2, Item 20) and
tighten nut (Figure 2, Item 23).
11.
Install two tiedown straps (Figure 2, Item 19) on air lines (Figure 2, Items 17, 18, and 22).
TM 9-2320-272-23-3
0456
0456-4


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