SYMPTOM PROCEDURES <AUTOMATIC TRANSMISSION>
TSB Revision
SYMPTOM PROCEDURES
23Ad-7
STEP 3. Check the hydraulic pressure (for low-reverse
brake).
Measure the hydraulic pressure for low-reverse brake when the
selector lever is at the "R" range, and check if the hydraulic
pressure is within the standard value. Refer to
P.23Ab-15
,
Hydraulic Pressure Test.
Q: Is the hydraulic pressure within the standard value?
YES : Go to Step 4.
NO : Go to Step 5.
STEP 4. Check the reverse clutch system and low-reverse
brake system.
(1) Remove the valve body cover and valve body. Refer to
P.23Aa-37
, Transmission and Transfer Assembly and refer
to GROUP 23B, Transmission
P.23B-18
.
(2) Blow 108 kPa (15psi) compressed air into the reverse
clutch oil orifice of the Transmission case. Then check if the
reverse clutch piston moves and air pressures are
maintained in that condition. Repeat for the low-reverse
brake.
Q: Are the reverse clutch, low-reverse brake or both air
pressures maintained?
YES : Go to Step 5.
NO : Go to Step 6.
STEP 5. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and valve
body for damage. Repair or replace the faulty parts. Refer to
GROUP 23B, Valve Body
P.23B-80
.
Replace the bulb body assembly if the damages are thought to
be irreparable. Then check the symptom.
Q: Is the repair possible and the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 7.
STEP 6. Check the reverse clutch, low-reverse brake or
both. Remove the Transmission.
Check the facing for seizure and the piston seal ring for dam-
age and interference with the retainer. Repair or replace the
faulty parts. Refer to GROUP 23B, Transmission
P.23B-18
,
Reverse and Overdrive Clutch
P.23B-67
. Then check the
symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 7.
ACX02249AC
REVERSE
CLUTCH OIL
ORIFICE
LOW-REVERSE
BRAKE OIL
ORIFICE
ACX02161AD
VALVE BODY ASSEMBLY
AC204883
REVERSE
CLUTCH
LOW-REVERSE
BRAKE
AC