Graymills DDP .375' Pump OMI - Manual (Page 24)

24
Service
Reassembly
1. Install the shaft seals (30
}) in the housing (1). Using a
rubber mallet, carefully drive the bearings (31
}) flush
into the housing so the holes face out. See Fig. 16.
2. Grease the diaphragm shaft (23
}) and slide it into the
housing (1). Install the o-rings (404*) in the grooves of
the housing.
3. Assemble the inner diaphragm plates (118), dia-
phragms (401*), and outer diaphragm plates (103) as
shown in Fig. 16. Apply medium-strength (blue)
Loctite
R or equivalent to the threads of the fluid-side
plates (103), and torque the plates to 75 to 85 in-lb (8.5
to 9.6 N-m) at 100 rpm maximum using a 1/2-in.
socket wrench. Do not over-torque. These parts must
be assembled correctly.
CAUTION
Do not over-torque the outer diaphragm plates (103).
Doing so will damage the hex heads.
4. When installing the covers (101), slip the clamps (111)
over the housing (1) before positioning the covers. See
the Detail in Fig. 16. Engage the notches in the covers
with the locator tabs on the housing, then position the
clamps over both parts. The clamp bolts should be on
the air valve side of the housing, and pointing down
toward the bottom of the pump. Install the grounding
strip on the bolts. Apply thread lubricant to the bolts,
then install the clamp nuts (113). Using a 7/16” socket
wrench, torque the nuts to 50 to 60 in-lb (5.6 to 6.8
N-m).
5. Reassemble the ball check valves and manifolds as
explained on page 21. Always install new o-rings
(108*), and make sure they are properly seated.
6. Reinstall the air valve, using the six mounting screws
(15). See Fig. 10.