CLUTCHES BANDS
LEVER START PARK
FRONT REAR LOCKUP
OVER-
RUNNING
(KICKDOWN) LOW/REV
POSITION SAFETY SPRAG FRONT REAR
P - PARK X X
R-
REVERSE
XX
N-
NEUTRAL
X
D - DRIVE
First X X
Second X X
Third X X X
2-
SECOND
First X X
Second X X
1 - Low X X
The rear clutch is applied in both the D first gear
and 1 first gear positions. Also, the overrunning
clutch is applied in D first gear and the low/reverse
band is applied in 1 first gear position. If the trans-
axle slips in D range first gear, but does not slip in 1
first gear, the overrunning clutch is slipping. Simi-
larly, if the transaxle slips in any two forward gears,
the rear clutch is slipping.
Using the same procedure, the rear clutch and
front clutch are applied in D third gear. If the trans-
axle slips in third gear, either the front clutch or the
rear clutch is slipping. By selecting another gear that
does not use one of those units, the unit that is slip-
ping can be determined. If the transaxle also slips in
reverse, the front clutch is slipping. If the transaxle
does not slip in reverse, the rear clutch is slipping.
The process of elimination can be used to detect
any unit that slips and to confirm proper operation of
good units. Road testing can usually diagnose slip-
ping units, although the actual cause of the problem
may not be detected. Practically any condition can be
caused by leaking hydraulic circuits or sticking
valves.
Therefore, unless the condition is obvious, the
transaxle should never be disassembled until hydrau-
lic pressure tests have been performed.
DISASSEMBLY
CAUTION: If transaxle failure has occured, it is nec-
essary to flush the transaxle oil cooler and lines to
remove debris and particles that could contaminate
and/or fail a new or rebuilt unit. (Refer to 7 - COOL-
ING/TRANSMISSION - STANDARD PROCEDURE)
NOTE: This procedure does not include disassem-
bly of final drive (differential) components. (Refer to
21 - TRANSMISSION/TRANSAXLE/AUTOMATIC -
31TH/FINAL DRIVE - DISASSEMBLY)
(1) Measure input shaft end play before disassem-
bly using Tool 8266 and dial indicator C-3339 (Fig.
1):
(a) Set up tools as shown in (Fig. 1).
(b) Move input shaft in and out to obtain end
play reading. End play specifications are 0.19 to
1.50 mm (0.008 to 0.060 inch).
(c) Record indicator reading for reference when
reassembling the transaxle.
PL 31TH AUTOMATIC TRANSAXLE 21s - 23
31TH AUTOMATIC TRANSAXLE (Continued)
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