GMC 1976 ZEO 6083 Maintenance Manual page 802

24J- 12 LIVING AREA WATER SYSTEM
Figure 18-Inspecting Diaphragm
5. Remove diaphragm screw to separate dia-
phragm and plates from connecting rod . Inspect dia-
phragm for cuts and ruptures (figure 18).
6. Remove eccentric screw to separate connect-
ing rod from jack shaft (figure 19).
7. When reassembling, be sure to align dia-
phragm and connecting rod so that rod slips straight
onto jack shaft and diaphragm rests squarely on dia-
Figure 19-Separating Connecting Rod
phragm retainer. Misalignment will create a strain
on diaphragm and significantly shorten its life . Ad-
just belt tension to 1/8" play .
PULSATION DAMPENER REPLACEMENT
1 . Turn off power to pump .
2. If system is filled with water, open a faucet to
relieve pressure . Close intake and discharge lines
near pump .
3 . Remove pump from vehicle.
4. Remove nine screws from bottom of base and
bottom plate (figure 20).
5 . Pull out rubber pulsation dampener from base .
6. Inspect dampener for excessive deformation,
ruptures and cuts (figure 21).
7. When installing new pulsation dampener,
make sure flange is well-seated to effect a proper
water and air seal .
MOTOR REPLACEMENT
1 . Turn off power to pump .
2 . Disconnect motor wires from pressure switch
terminal .
Figure 2 0-Removing Bottom Plate