Graymills DDP 1' Pump OMI User Manual
Page 19
19
4.
Unscrew one outer plate (105) from the diaphragm
shaft (24). Remove one diaphragm (401), and the inner
plate (104). See Fig. 13.
NOTE: Teflon
R models include a TeflonR diaphragm
(403) in addition to the backup diaphragm (401).
5.
Pull the other diaphragm assembly and the diaphragm
shaft (24) out of the center housing (1). Hold the shaft
flats with a 19 mm socket wrench, and remove the
outer plate (105) from the shaft. Disassemble the
remaining diaphragm assembly.
6.
Inspect the diaphragm shaft (24) for wear or scratches.
If it is damaged, inspect the bearings (19) in place. If
the bearings are damaged, refer to page 21.
7.
Reach into the center housing (1) with an o-ring pick
and hook the u-cup packings (402), then pull them out
of the housing. This can be done with the bearings (19)
in place.
8.
Clean all parts and inspect for wear or damage. Re-
place parts as needed.
Reassembly
1.
Grease the shaft u-cup packings (402*) and install
them so the lips face out of the housing (1). See Fig.
13.
2.
Grease the length and ends of the diaphragm shaft (24),
and slide it through the housing (1).
3.
Assemble the inner diaphragm plates (104), dia-
phragms (401*), Teflon
R diaphragms (403*, if pres-
ent), and outer diaphragm plates (105) exactly as
shown in Fig. 13. These parts must be assembled
correctly.
4.
Apply medium-strength (blue) Loctite
R or equivalent
to the threads of the fluid-side plates (105). Hold one
of the outer plates (105) with a wrench, and torque the
other outer plate to 20 to 25 ft-lb (27 to 34 N-m) at 100
rpm maximum. Do not over-torque.
5.
Align the fluid covers (101) and the center housing (1)
so the arrows (A) on the covers face the same direction
as the air valve (B). Secure the covers with the screws
(106 and 112), handtight. Place the bolt caps (113*) on
the longer screws (106), and install the longer screws
in the top and bottom holes of the covers. See Fig. 12.
6.
First, torque the longer screws (106) oppositely and
evenly to 100 to 150 in-lb (11 to 17 N-m), using a 10
mm socket wrench. Then torque the shorter screws
(112).
7.
Reassemble the ball check valves and manifolds as
explained on page 17.