TM-9-2520-254-34
TRANSMISSION, AUTOMATIC, ALLISON, MODEL TX100-1
TECHNICAL MAUAL; DIRECT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1971
TM-9-2520-254-34 - Page 112 of 126
Table 5-1. Hydraulic Pressure Char t
Mail Pressure (psi) :
Range
Low (converter) (lockup)
Int. (converter (lockup)
High [converter) (Iockapl
Selector
position
Throttle setting
Closed
Full, at detent
Fu1l, through detent
I
I
1
225-270
270-315
280-325
1
100-120
115-135
120-140
1.2
225-270
270-315
280-325
1.2
100-120
115-135
120-140
2-3
135-180
180-225
190-235
~.:{
100-120
115-135
120-140
NOTE
Lockup pressures should be measured at
1,900 to 2,000 rpm engine speed. Use the
vehicle service brakes, if necessary, while
measuring full throttle “at detent” or
“through detent”
pressures. converter
pressures
for low range (first gear) and
intermediate
range
(second gear) “at
detent” or
“through detent” should be
measured while the transmission output is
stalled.
Front Governor (Gl) Pressure:
Front governor pressure is measured during
lockup while operating in selector position 1.
(;
1
prwsure
Engine speed
.30
psi
1,850 to 1,900” rpm
80 psi
2,300 tO 2,400” rpm
G~ar
Throttle position
High [ 3d lockup)
“Tllrougt] detent”
(1) With manual selector control at neutral
(N), start engine and run it until transmission
temperature reaches normal (180° to 200° F.).
Shift through all gears to fully charge hydraulic
system with oil.
for
NOTE
It may be necessary to shift to high-range
position and operate transmission at 1,200
to 1,500 rpm (1,000 rpm engine speed)
while applying vehicle brakes (or locking
transmission
output)
to reach norm a 1
operation temperature.
CAUTION
Do not allow converter-out (cooler) oil
temperature to exceed 300° F.
(2) Check transmission and external oil lines
leakage.
(3) Before any oil pressure tests are made,
check engine idling speed. Engine idling speed is
500 to 600 rpm. Refer to note following (1) above.
b. Oil Pressure.
5-62
Rear Governor (G2) Pressure:
Rear governor pressure is measured during
operation in high range (third gear) lockup when
the engine speed is measured. It may be measured
-
during converter operation if transmission output
speed is measured.
(;2
prrnure
Engine spwd
Output speed
.50 psi
l,750rpm 2,275 rpm
80 psi
2,350 rpm
3,025 rpm
Lubrication Pressure:
Transmission lubrication pressure is checked
at the cooler return line.
Engine speed
Pressure
2,3.50
rpm
10 tO 30 psi
NOTE
Do not attempt to connect or disconnect
pressure gages while engine is operating.
(1) There are four pressure check points on
the transmission (fig.
5-142). Three are on the
lower-left side of the transmission housing. The
remaining one is at the lower-rear of the housing.
These points have plugs which are removed to
attach pressure gages as follows:
Lockup pressure check point
(
1
/
8
NPTF)—0-400 psi gage from kit
Main pressure check point
(¼ NPTFT)—0-400 psi gage from kit
Front governor (Gl) pressure check point
(¼ NPTF)—0-100 psi gage from kit
Rear governor (G2) pressure check point
(
1
/
8
NPTF)—0-100 psi gage from kit
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