Chevrolet 1977 10 Series, Repair Manual, Page: 269 / 468

AUTOMATIC TRANSMISSION
(200)7A-33
PUMP
ASSY.
1-25015
Fig. 7 A - 1 3 7 A - A l i g n i n g Pu m p Co ver and Pump Bo d y
5. Inspect stator shaft for dam aged splines or damaged
bushings.
6. Inspect orifice plug (see Fig. 7A-135A). If the plug
requires replacement, place new plug, orifice end first, into
plug hole from the rough casting side. Drive the plug flush
to .25mm (.010") below top of hole, rough casting side.
Stake the top of hole two places to retain the plug.
Reassembly
1. Place pum p body over hole in bench.
2. Assemble pum p cover to pum p body with attaching
bolts, finger tight.
3. Align pum p cover and pum p body using J-25015
(Fig. 7A-137A) and place bolt or screwdriver through pump
to case bolt hole and bench.
4. Torque pump cover attaching bolts to 20.0-27.0
N -m (15-20 ft. lbs.).
5. Remove J-25015.
6. Install pressure regulator spring, guide, valve with
stem end out, and bore plug, hole side out (Fig. 7A-126A).
7. Compress pressure regulator valve spring by pushing
on bore plug with small screwdriver and install retaining
ring (Fig. 7A-128A).
8. If removed, install 3 new oil seal rings, m aking sure
cut ends are assembled in the same relationship as cut (Fig.
7A-120A). Also, make sure rings are seated in the grooves
to prevent damage to the rings during reassembly of m ating
part over rings Retain with petrolatum .
9. Install pum p to case seal ring, chamfered side out,
making sure the ring is not twisted.
10. Install pum p to direct clutch thrust washer and
retain with petrolatum (Fig. 7A-127A).
11. Remove holding bolt or screwdriver.
12. Install new pum p to case gasket on pump and retain
with petrolatum .
13. Install 2 pum p to case alignment pins in case as
shown in Fig. 7A-138A.
NOTE:
Before installing pump, make sure
interm ediate band anchor pin lug is aligned with band
anchor pin hole in case.
14. Install pum p assembly and finger start pump to case
bolts and new washers, except one bolt hole (Fig. 7A-139A),
which will be used to make the front unit end play check.
NOTE:
If turbine shaft cannot be rotated as pum p is
being pulled into place, the forward or direct clutch
housings have not been installed properly to index with
all the clutch plates. This condition must be corrected
before pum p is pulled fully into place.
15. Replace 2 alignm ent pins with 2 bolts and new
washers.
16. Torque pum p to case bolts to 20.0-27.0 N -m (15-20
ft. lbs.).
NOTE:
M ake sure turbine shaft rotates freely.
Check Front Unit End Play (Fig. 7A -139A )
1. Install 278mm (11") bolt and locking nut as shown
in Fig. 7A-139A.
2. Push turbine shaft downward.
3. Install J-25022 on J-24773 tool and locate on end of
turbine shaft (Fig. 7A-139A).
4. M ount dial indicator on bolt and position indicator
point against cap nut of J-24773.
5. Move output shaft forw ard by turning the adjusting
screw on J-25013-5 until the white or scribed line on sleeve
J-25013-1 begins to disappear, then set dial indicator to
zero.
6. Pull turbine shaft upward, and read end play. Front
unit end play should be 0.56mm-1.30mm (,022"-.051").
NOTE:
Selective washer controlling this end play is
located between the output shaft and turbine shaft. If
more or less washer thickness is required to bring end
GUIDE PINS
Fig. 7 A -1 38 A —Installing Pump Assembly Fig. 7 A -1 3 9 A -C h e c k in g Front Unit End Play