TM-9-2320-273-34
TRUCK TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 1980
TM-9-2320-273-34 - Page 231 of 801
TM 9-2320-273-34
(5)
Install assembled pressure regulator (4) on transmission control, making sure the notches on
the valve are alined with the “V” marked stamped on the transmission control as shown in illustration.
(6)
Install cover (3) with a new O-ring and fasten with four washers (2) and capscrews ( 1 ).
f. Test Results of Adjustment.
(1)
Start and operate the engine. (Refer to TM 9-2320-273-10).
(2)
When the vehicle air system pressure is normal, push in the handle of the air valve in the
ratio selector and test the adjustments made to the pressure regulator by repeating paragraph 7-8a.
(3)
When the pressure regulator adjustments are correct pull the knob of the transmission air
charging valve in the ratio selector to OFF, Remove the test hose and gage; then install clutch disengage-
ment sensor in test port for output clutch (5, fig. 7-47).
7-9.
Quick-Fill Valve. The quick-fill valve for output clutch engagement is in operation only when the
air pressure to the output clutch is less than 5-7 psi (35-50 kPa), The quick-fill valve can be tested and
an adjustment made on the quick-fill valve when the air pressure is not 5-7 psi (35-50 kPa).
a. Test.
(1)
Pull the knob of the transmission air charging valve in the ratio selector to the OFF position.
(2)
put system park brake ON to prevent vehicle from rolling.
(3)
Remove plug (6, fig. 7-50) and clutch disengagement sensor in test port for output clutch
(5). Remove orifice in port where plug (6) was removed and install a standard plug (1/16-in. NPT) where
the orifice was removed.
(4)
Install an air hose with a low pressure test gage 10-15 psi (70-106 kPa) range in port for
output clutch (5) (1/8-in, NPT).
(5)
Start and run the engine. (Refer to TM 9-2320-273-10). When the vehicle air system
pressure is at normal operating pressure, push the knob of the transmission air charging valve on the ratio
selector to the ON position,
(6)
Move the ratio selector lever to the 16th speed position.
Record pressure on test gage. If
the pressure is not 5-7 psi (35-50 kPa) the quick-fill valve must be adjusted.
b. Adjustment.
Adjustment is accomplished by adding or removing shims (12, fig. 7-50). The
effects of a shim change are shown in table 7-2.
Table 7-2. Pressure Change With Removal Or Addition Of One Shim
Shim
Thickness
Change
,
Item No.
in.
mm
psi
kPa
12, Figure 7-50
.030 0.76
.25
1.8
.
(1)
Pull the knob on the transmission air charging valve in the ratio selector to the OFF
position.
(2)
Remove plug in quick-fill valve (7, fig. 7-50).
7-53
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