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 48 of 126
transmission assembly. Use table 4-1 in conjunction
4-6. Troubleshooting—TX 100-1 Transmission
with paragraph 5-62, tests, and paragraph 5-63,
Removed from Vehicle
adjustments. In table 4-1, the letters opposite the
When the malfunction has not been determined
malfunction
indicate
the probable causes o f
before removal from the vehicle, the transmission
trouble. The instructions in the last column are to
should be mounted on a test stand and checked.
be followed in correcting the malfunction.
Refer to paragraphs 5-60 through 5-62. Particular
4-5. Troubleshooting Tests
attention should be given to correct adjustment and
All tests prescribed after assembly (para 5-58) may
proper oil level in every test.
be applied to the transmission assembly in which a
malfunction is suspected.
Table 4-1. Troubleshooting
Malfunction
1. Lockup clutch does not engage.
2. Lockup clutch engages at too low
speed.
3. Lockup clutch engages at too high
speed.
4.
Automatic shift from low to in-
termediate
nccurs
at
too
low
speed.
5. Automatic shift from low to in-
termediate
occurs
at
too
high
speed.
6.
Transmission
does
not
shift
automatically out of low range.
7.
Transmission
does
not
shift
manually out of low range.
Probable Cause
;I.
Lockup valve or plug sticking in
bore.
l). Seal ring on lockup clutch piston
failed or omitted.
r. Hook-type seal ring ( 11, fig. 5-62)
broken or missing.
(f. Front governor ( G 1 } pressure low.
c. Flow valve sticking in bore. Valve
toward larger diameter of bore.
~. Lockup clutch plate failed.
:1. Lockup
valve
spring
weak
or
broken.
l). ‘lhrottle
valve
linkage
discorr-
nected
or
improperly adjusted.
it. Throttle valve linkage improperly
adjusted.
1~. Front governor
(G 1 ) pressure low.
,.
Lockup
valve
spring
load
ex-
cessive.
Low-intermediate shift valve spring
a .
/).
(..
a .
/).
(.
a.
b.
.
.
broken or weak
Rear governor (G2 ) pressure low.
Throttle valve linkage improperly
adjusted.
Low-intermediate
shift
valve
spring load excessive.
Rear governor (G2) pressure low.
Low-intermediate shift plug, shift
valve, or blocker plug sticking.
SIlift
linkage
disconnected
(manual
selector
valve
at
1-
position ).
Shift
linkage
disconnected
(manual
selector
valve
at
1-
positiorr).
Low-intermediate
shift
valve
or
blocker plug sticking.
r. Manual selector valve sticking at
1 -position.
Corrective Action
a.
Overhaul
(rebuild)
or
replace
control valve assembly ( para 5-52
through 5-56).
b. Install new seal ring
(para 5- 7
through 5-11).
r.
Replace
seal
ring
or
overhaul
transmission ( para 5-17 through
5-21) .
d. Refer to item 14 below.
c.
Overhaul
(rebuildl
or
replace
control valve assembly (para 5-5 2
through 5-56)
J Replace clutch plate (fig. 5-119) .
a.
Overhaul
(rebuild)
or
replace
control valve assembly ( para
5-52
through 5-56).
l). Repair,
replace and
/ or adjust
linkage (para 5-63).
a.
Adjust linkage (para 5-63).
b. Refer to item 14 below.
r. Check spring load
(table 6-2);
replace spring (para 5-52 through
5-56).
Check spring load (table 6-2) ;
replace spring (para 5-52 through
5-56) .
a. Refer to item 15 below.
b. Adjust linkage (para 5-63) .
r. Check spring load (table 6-2) ;
replace spring ( para 5-52 through
5-56) .
a. Refer to item 15 below.
b.
Overhaul
(rebuild)
or
replace
control valve assembly (para 5-52
through 5-56).
r. Connect and adjust linkage
5-63) .
a. Connect and adjust linkage
5-63) .
para
para
b.
Overhaul (
rebuild)
or
replace
control valve assembly ( para 5-52
through 5-56).
r.
Overhaul
(rebuild)
or
replace
control valve assembly ( para 5-52
through 5-56).
4-2
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