Jeep 1987 Wrangler Workshop Manual page 752

AUTOMATIC TRANSMISSION
DIAGNOSIS AND TESTING
E — Hydraulic Pressures: Perform the hydrau-
lic pressure test to determine if operating pres-
sures are within specifications. Repair hydraulic
components as necessary. Check and correct
throttle and line pressure settings if required.
F — Front Band: Adjust to specifications.
G — Rear Band: Adjust to specifications.
H — Neutral Start Switch: Check the wires and
connections. Test the switch. Valve body manu-
al lever must ground the switch in P and N . If
not OK, check ground strip at the valve body
manual lever. If OK, check the starting circuit.
I — Park Lock: Check condition of the lock rod
ball, sprag, reaction plug, governor support and
sprag shaft. Replace parts as required.
J — Transmission Oil Cooler: Check cooler
and lines for obstructions or leaks. Look for
milky colored transmission fluid which indicates
coolant in the fluid.
K — Output Shaft Bearing, Bushing or Seal:
Remove the extension housing, inspect the
parts and replace as necessary.
L — Governor Valve: Clean and inspect the
valve components. Check the weights, shaft
and valve for burrs, nicks, scores or binding.
Check the spring for collapsed or distorted coils
and the snap rings for distortion. Check the fil-
ter for dirt and debris. Inspect the body for
cracks or warpage. Check torque on the gover-
nor and output shaft support bolts.
M — Oil Filter: Inspect and replace if clogged.
N
— Valve Body: Remove, disassemble and
clean thoroughly. Inspect valves and plugs for
nicks, scratches, burrs and rounded edges on
valve lands. Check the bores for scratches, the
springs for collapsed coils, and all mating sur-
faces for nicks, burrs or warpage. Tighten the
valve body screws to exact specifications dur-
ing assembly.
0 — Front Servo and Linkage: Inspect the
piston for wear, cracks, and worn or broken
seal rings. Check the springs for collapsed for
broken coils. Check the servo bore for
scratches, nicks or wear. Check the lever, strut
and band for damage. Check the lever shaft
and O-ring for wear.
P — Rear Servo and Linkage: Refer to the
front servo inspection/service procedures.
Q — Accumulator: Clean and inspect for bro-
ken seal rings, scratched bores or broken or
collapsed springs. Check the piston for cracks
or evidence of the piston cocking in the bore.
R — Air Pressure Test: Remove the valve
body and use air pressure to apply clutches and
bands to check operation.
S — Engine Tune and Performance: Verify
proper engine operation. Be sure the compres-
sion meets specifications and that the fuel and
ignition systems are functioning properly.
T — Stall Test: Perform the stall test to check
holding ability of the converter and transmis-
sion clutches.
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