19
or XW, Item 600, Figure 15), discharge
check valve (XT, Item 180, Figure 8 or XW,
Item 510, Figure 15), and bleeder plug (XT,
Item 190, Figure 8 or XW, Item 335, Figure
15).
3. Using a 3/8" hex wrench, remove 8 bolts (XT,
Item 220, Figure 8 or XW, Item 350, Figure
15) which attaches diaphragm head (XT,
Item 230, Figure 8 or XW, Item 330, Figure
15) to pump.
4. Remove contour plates (XT, Item 210, Figure
8 or XW, Item 280, Figure 15), O-ring (XT,
Item 195, Figure 8 or XW, Item 215, Figure
15), and diaphragm (XT, 200 or XW, 290).
(When equipped with leak detection remove
two diaphragms (XT, 290 or XW, 291), leak
detection ring A (287), leak detection ring B
(288), and leak detection ring spacer (287).
Leak detection ring A, leak detection ring B,
and leak detection ring spacer can be
reused). Do not remove roll pins (XT, Item
215, Figure 8 or XW, item 281, Figure 15),
which will remain attached to contour plates.
5. Clean all components with an appropriate
solvent. Contact Milton Roy Company for a
recommended solvent. Inspect all parts and
replace them if they are worn.
NOTE: The diaphragm (XT, 200 or XW, 290)
must be replaced each time the liquid end is
removed.
Reassembly
1. Insert inner contour plate (XT, Item 210, Fig-
ure 8 or XW, Item 280, Figure 15) into pump
housing, being sure that roll pin (XT, Item
215, Figure 8 or XW, item 281, Figure 15)
inserts into guide hole in housing. Contour
plate should be flush with housing.
2. Lay the diaphragm (XT, 200 or XW, 290) in
recessed groove of housing, using some
grease to hold it in place. (When equipped
with leak detection install two diaphragms
(XT, 290 or XW, 291), leak detection ring A
(287), leak detection ring B (288, and leak-
detection ring spacer (287) removed previ-
ously. Apply a small amount of mineral oil
between diaphragms. Stacked diaphragms
and rings maybe aligned using three small
holes as a guide).
3. Insert second contour plate (XT, Item 210,
Figure 8 or XW, Item 280, Figure 15) into
diaphragm head (XT, Item 230, Figure 8 or
XW, Item 330, Figure 15), being sure that roll
pin (XT, Item 215, Figure 8 or XW, item 281,
Figure 15) inserts into guide hole in dia-
phragm head. Contour plate should be flush
with diaphragm head.
4. Insert O-ring (XT, Item 195, Figure 8 or XW,
Item 215, Figure 15) into diaphragm head,
using some grease to hold it in place.
5. Align diaphragm head (XT, Item 230, Figure
8 or XW, Item 330, Figure 15) so bleeder
plug hole is oriented toward top of pump.
Carefully align diaphragm head with bolt
holes, being sure O-ring and diaphragm
remain in their grooves. Insert 8 bolts (XT,
Item 220, Figure 8 or XW, Item 350, Figure
15) and tighten XT/XW pump bolts to a
torque of 60 ft-lbs (81 N-m). Be sure to use
an alternating tightening pattern when torqu-
ing bolts.
NOTE: The XT/XW suction and discharge
check valves are NOT interchangeable.
6. Install discharge check valve (XT, Item 180,
Figure 8 or XW, Item 510, Figure 15), and
suction check valve (XT, Item 240, Figure 8
or XW, Item 600, Figure 15), being sure to
apply thread sealing compound AND PTFE
pipe thread tape to all connections. Make
sure end of suction check valve with internal
hex is screwed into diaphragm head.
7. Insert bleeder plug (XT, Item 190, Figure 8 or
XW, Item 335, Figure 15) into hole in dia-
phragm head and tighten it snugly with a
wrench.
8. Insert drain plug into housing, using thread
sealing compound. Discard old oil and fill
pump with oil specified.
4.8.2 Motor and Worm Components:
NOTE: The motor must be removed in order
to replace or inspect the motor or the gears.
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