Graco PGM Instructions - Parts Manual page 46

Repair
PGM-20 Pump Assembly
Do not hammer or force components together, or
damage may occur. Parts will drop into place if prop-
erly cleaned and aligned. Use of a compatible oil is
recommended during assembly.
1. Place back plate (1503) on a table inside face up.
2. Install the driven gear (1507) on stud (1505).
3. Place gear case (1502) onto back plate (1503).
Check orientation of dowel pin holes to assure they
align with the ones in the back plate.
4. Place the top plate (1501) on its edge on a table.
Pass the drive shaft (1504) through the top plate
from the seal side so that the boss on the shaft rests
on the top plate.
5. Rotate the drive shaft (1504) to position the drive
key slot at the top. Insert the drive key (1508) and
driven gear (1506).
6. Grasp the top plate (1501), drive shaft (1504) and
driven gear (1506) to prevent them from separating
and carefully lower them into position onto the gear
case (1502).
7. Rotate the gears several times to ensure free rota-
tion.
8. Insert the dowel pins (1509) and check again for
free rotation.
NOTE: Dowel pins are not a press fit and may be
installed using a plastic hammer if necessary.
9. Install pump plate screws (1514) and tighten to
85-105 in-lb (9.6-11.8 N•m).
10. Rotate the gears several times to ensure free rota-
tion.
11. Apply a heat resistant, non-evaporating lubricant to
the seal area of the drive shaft (1504).
12. Install new seals (1513). See F
13. Install spacers (1510, 1511), seal retainers, (1512)
and seal retainer screws (1515). Tighten screws to
85-105 in-lb (9.6-11.8 N•m).
46
NOTICE
. 26 and F
IG
14. Align pump shaft key and slide coupling onto pump
shaft. Tighten coupling bolt just enough to hold it's
position.
15. Attach servo motor, gear head, and top plate to
pump assembly. See F
16. Separate coupling until proper gap is created. See
F . 21.
IG
17. Tighten pump block mounting shoulder bolts to
frame (4).
18. Replace all electrical connections and fluid connec-
tions before applying fluid pressure and power.
. 27.
IG
. 20.
IG
3A5185B