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T U R B O H Y D R A - M A T I C
400
A U T O M A T I C T R A N S M I S S I O N
7 A 4 - 4 1
Fig. 7A4-72 Front Accumulator Piston
-
Exploded View
1 .
MANUAL VALVE
2.
RETAINING PIN
3.
BORE PLUG
4 .
DETENT VALVE
6.
DETENTREGULATORVALVE
6,
SPACER
7.
DETENT REGULATOR VALVE SPRING
6.
1-2SHlFTVALVE
9.
1-2 DETENT VALVE
10.
1-2 REGULATOR VALVE SPRING
11.
1-2 REGULATOR VALVE
12.
1-2 MODULATOR BUSHtNG
13.
RETAINING PIN
14.
GROOVED RETAINING PIN
15.
BORE PLUG
1-2 ACCUMULATOR SECONDARY SPRING
1-2 ACCUMULATOR VALVE
1-2 ACCUMULATOR PRIMARY SPRING
2-3 SHl FT VALVE
2-3 SECONDARY SPRING
2-3 MODULATOR VALVE
2-3 PRIMARY SPRING
\
2-3 MODULATOR BUSHING
RETAINING PIN
3-2 VALVE
SPACER
3 2 VALVE SPRING
BORE PLUG
RETAINING PIN
3840
Fig. 7A4-73 Control valve Assembly
-
Exploded View
INSPECT CONTROL VALVE ASSEMBLY
NOTE:
See Fig. 7A4-72. Do not remove the teflon oil
seal ring from the front accumulator piston unless the
oil seal ring requires replacement. For service, the
replacement oil seal ring will be cast iron.
1. Inspect all valves for scoring, cracking and free
movement in their respective bore.
2. Inspect bushing for cracks, scratches or distortion.
3. Inspect body for cracks or scored bores.
4. Check all springs for distortion or collapsed coils.
5. Inspect front accumulator piston and oil seal ring for
damage.
ASSEMBLE CONTROL VALVE
ASSEMBLY
1. Install front accumulator spring and piston into valve
body, install Compressor J 2 1885, compress spring and piston
and secure with retaining E-ring (Fig. 7A4-71).
2. In lower left bore, install the 1-2 accumulator primary
spring (not used on PA, OB or OC models) and the 1-2
accumulator valve (stem end out). Install the 1-2 accumulator
secondary spring (used on PA and OB models only), the bore
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