1956 AMC Hudson Technical Service Manual Supplement

HYDRA-MATIC TRANSMISSION 87
NOTE: Rear bearing and snap ring will be installed
in rear pump after rear pump is attached to
transmission case.
DISASSEMBLY OF SERVO AND ACCUMULATOR
Remove servo piston from accumulator body. Remove two
opposite screws from accumulator cover and install special
tool J-6124. Turn screw down against accumulator cover
and remove remaining cover screws.
Back off screw of tool to remove tension on accumulator
springs and remove tool and cover (Fig. 112).
1. Indexing Mark on Gears 3. Driven Gear
2. Drive Gear
FIGURE 110—Rear Pump Drive and
Driven Gears
ASSEMBLY OF REAR PUMP
Install rear pump drive and driven gears indexing marks
which were made for identification during disassembly.
Install governor drive key into driven gear, making sure
key is properly seated. Use petrolatum to hold key in place.
Install cover on pump body indexing dowels in cover
with dowel holes in body. Then secure cover with eight
attaching screws (Fig. 11,1).
l. Accumulator Cover 2. Special Tool J-6124
FIGURE 112—Removing Accumulator Cover
Remove accumulator piston, inner and outer springs,
and cover gasket.
Remove seal from small end of accumulator piston.
Remove trimmer valve retainer plug pin from accumulator
body using a small punch or nail. Then remove the plug,
trimmer valve and spring.
NOTE: The hole in which pin enters is tapered so
pin will be retained by cover and not fall out of
opposite end (Fig. 113).
ASSEMBLY OF SERVO
AND ACCUMULATOR
1. Snap Ring 6. Drive Gear
2. Rear Bearing 7. Rear Pump Body
3. Governor Drive Key 8. Oil Rings
4. Rear Pump Cover 9. Reverse Piston
5. Driven Gear
FIGURE 111—Exploded View Rear Oil Pump
Turn pump over and install reverse piston in cavity in
rear pump. Make sure oil rings are installed on reverse
piston and hub in pump and that ring on hub is centered.
Place piston into cavity indexing it with dowels. Compress
outer ring with fingers and push piston into cavity.
CAUTION: Inner ring must be centered on hub
in order for taper of piston to compress ring.
Install trimmer valve spring, trimmer valve, retainer plug,
and pin. Compress plug against the spring tension so that
pin will enter groove of plug.
Install new neoprene seal on small end of accumulator
piston with lip toward large end. Make sure oil ring is in
place on large end.
Install outer and inner accumulator springs in piston.
Install accumulator cover and gasket on special tool J-
6124. Install
springs and piston in accumulator body and place special
tool, cover, and gasket against piston and thread tool studs
into body. Then tighten center screw until cover is pressed
against accumulator body.
NOTE: Make sure that piston is centered when
entering bore of body when compressing springs.
The oil ring will be compressed by taper in bore
of body.