Chevrolet 1980 Light Duty Truck Repair Manual page 309

Fig. 7 A - 7 3 C - P r e s s u r e R e g u l a t o r V a l v e I d e n t i f i c a t i o n
Inspection of Pum p Body and Pum p Cover
N O TIC E:
A solid type pressure regulator valve must
only be used in a pump cover with a squared off
pressure regulator boss. See Fig. 7A -73C . A pressure
regulator valve with oil holes and orifice cup plug may
be used to service either type pump cover.
1. Inspect drive and driven gear pocket and crescent
for scoring, galling or other damage.
2. Place pum p gears in pump body and check pump
body face to gear face clearance (should be .0008" - .0035")
(Fig. 7A-74C).
3. Check face o f pump body for scores or nicks.
4. Check oil passages (Fig. 7A-75C).
5. Check for damaged cover bolt attaching threads.
6. Check for overall flatness o f pump body face.
Fig. 7A-7 4C--Checking Pump Body Face to Gear Face
Clearance
PUMP COVER
FOR ID E N T IF IC A T IO N -
SQUARED OFF PRESSURE
REG, BOSS.
is necessary, proceed as follows:
rem ove bushing.
driver Handle J-8092 install new bushing flush to .010"
below gear pocket face.
replace if necessary.
interconnected (Fig. 7A -76C ).
INTAKE
PRESSURE REGULATOR
FEED HOLE
A U TO M A TIC TR A N S M IS S IO N S
VENT
CONVERTER
LINE
INTAKE
REVERSE
MODULATOR OR
INTERMEDIATE
F ig . 7 A - 7 5 C - P u m p B o d y O il P a s s a g e s
7. Check bushing for scores or nicks. If replacement
a. U sing T ool J-21465-17 and driver Handle J-8092
b. From front side o f pump, using J-21465-17 and
8. Inspect pump attaching bolt seals for damage,
9. Inspect pump cover face for overall flatness.
10. Check for scores or chips in pressure regulator bore.
11. Check that all passages
DRIVE
REVERSE
EXHAUST
CONVERTER
VENT
Fig. 7A-76C ~Pump Cover Oil Passages
(400)7A -23
COOLER
RETURN
TO
COOLER
SEAL DRAIN
BACK HOLE
DRIVE
are open and not
MODULATOR OR
INTERMEDIATE
TO
COOLER
COOLER
RETURN
BREATHER
HOLE
COVER-PUMP