Graco 1590 SA, Instructions-Parts List Manual

Page: 21 / 40

Service
310622L 21
7. Repeat for inlet manifold.
Reassembly
1. Reassemble inlet and outlet fluid manifolds in
reverse order. See step 6. Tighten clamps
handtight.
2. Reassemble ball or flapper check assembly in
reverse order. See step 5. Tighten clamps
handtight.
Diaphragm Repair
Tools Required
• Torque wrench
• 5/8 in. wrench
• 19 mm open end wrench
• O-ring pick
• Lithium-base grease
• Spanner wrench
Disassembly
1. Relieve the pressure.
2. Remove the manifolds and disassemble the ball
check valves as explained on page 19.
3. Hold fluid covers in place and remove the clamps
(135). Pull the fluid covers (234) off the pump
.
4. Non 3A approved diaphragms: With both fluid cov-
ers removed, using two 5/8 in. wrenches hold the
wrench flats (Y) on the plates of each diaphragm
assembly and loosen. One diaphragm assembly will
come free and the other will remain attached to the
shaft.
3A approved diaphragms: Diaphragms are assem-
bled handtight. To loosen, grip both diaphragms
securely around the outer edge and rotate counter
clockwise. One diaphragm assembly will come free
and the other will remain attached to the shaft. Con-
tinue to step 6.
5. Disassemble the free diaphragm assembly.
6. Remove plate (444) with bolt (143) installed, dia-
phragm (446), backer (447) if present, and plate
(445)
Lubricate clamps, clamping surfaces, and gaskets
with waterproof, sanitary lubricant.
For flapper check, make sure flapper check (251)
is placed properly in housing (248) groove and
flapper retainer (253) is aligned with housing
groove. Ensure that the flapper check moves freely.
F
IG
. 16
TI8771a
135
234
Y