Yanmar 1GM10 Shop Manual page 180

174
20. Install the cam (5, Figure 24) and the cam retaining
screw (6).
Replace the pump impeller anytime it is re-
moved from the pump. Ifthe original impel-
ler must be reused, make sure to install it in
the same rotational direction as originally
installed.
21. Lightly lubricate the tips and sides of the impeller. In-
stall the impeller into the pump body by rotating the im-
peller counterclockwise. Be certain all impeller blades
bend in the same direction (Figure 25).
22. Install the cover and gasket.
23. Install the three screws securing the pump cover to
the body.
and
1 . Remove the six screws securing the pump cover (19,
Figure 26) to the body (12).
2. Remove the cover and gasket. Discard the gasket.
Extract the impeller (17, Figure 26) from the pump
3.
body.
4. Rotate the pump shaft to check the bearings for rough-
ness, excessive wear or other damage. Do not remove the
5. Unscrew the pulley retaining nut, then remove the pul-
ley (3, Figure 26) and spacer (4).
6. Remove the snap ring (5, Figure 26) at the rear of the
pump body.
7. Lightly tap the impeller shaft (9, Figure 26) toward the
front of the pump to remove the impeller shaft and bearing
assembly.
8. Unscrew the cam retaining screw (13, Figure 26), then
remove the cam (16).
9. Remove the seal ring (10, Figure 26) and bearing
cover (8) from the shaft.
10. Press the bearings from the pump shaft using a uni-
versal press plate and arbor press. Force each bearing to-
ward the threaded end of the shaft. Note the spacer (7,
Figure 26) between the bearings.
11. Extract or push out the seal.
12. Clean all metal components in solvent, then dry them
with compressed air.
13. Thoroughly clean all gasket material from all mating
surfaces.
14. Inspect the pump shaft for grooves in the seal contact
area.
15. Inspect the impeller for cracked blades or excessive
wear at the tips of the blades. Replace the impeller if any
defects are observed.
NOTE
16. Inspect the pump body and cover for grooves or other
damage. A damaged or excessively worn body or cover
will reduce pump efficiency and may damage a new im-
peller.
17. Press the bearings onto the shaft with the spacer (7,
Figure 26) between the bearings. Seat the bearings
against the shoulder on the shaft. Press only on the bearing
inner races.
18. Install the seal (1 1 , Figure 26) into the pump body so
the lip is toward the impeller side of the body.
19. Install the cam (16, Figure 26), then install the cam
retaining screw (1 3).
20. Install the bearing cover (8, Figure 26) with the con-
cave side toward the bearing.
21. Install the seal ring (10, Figure 26) onto the shaft.
22. Install the shaft assembly into the pump body.
23. Install the snap ring (5, Figure 26).
24. Install the spacer (4, Figure 26), pulley (3), washer
(2) and nut (I), then tighten the nut.
Replace the pump impeller anytime it is re-
moved from the pump. Ifthe original impel-
ler must be reused, make sure to install it in
the same rotational direction as originally
installed.
25. Lightly lubricate the tips and sides of the impeller. In-
stall the impeller into the pump body by rotating the im-
peller counterclockwise. Be certain all impeller blades
bend in the same direction (Figure 27).
26. Install the cover (19, Figure 26) and gasket.
27. Install the six screws securing the pump cover to the
body.
3HM
and
1. Remove the six screws (19, Figure 28) securing the
pump cover (1 8) to the body (12).
CHAPTER EIGHT
Impeller
direction
NOTE