Graco Endura-Flo 4D150, Instructions - Parts Manual

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Repair/Service
6. Your replacement diaphragm kit includes two
diaphragm tools (AC) and a plug (AD). These
parts are used to provide an air-assist to make it
easier to remove the diaphragms.
7. Place a diaphragm tool (AC) on both the inlet and
outlet ports. Install an air fitting (1/8 in. npt) on
one tool. Install a plug (AD) on the other tool.
8. Supply shop air at about 20 psi (0.14 MPa,
1.4 bar). Do not use over 30 psi (0.21 MPa,
2.1 bar). The shaft will move to one side.
9. Grasp the exposed diaphragm (18) with both
hands and turn to remove it. If the diaphragm is
difficult to remove, wrap a paper towel or rag from
the back to the front of the diaphragm to provide
a better grip, or try removing the diaphragm on
the other side of the pump.
10. Remove the diaphragm plate (21) and the
washer (40, used only on 4D350 models) from
the diaphragm.
11. Leave the air on. Use a 3/4 in. claw foot wrench
to loosen the piston shaft (24) attached to the
other diaphragm.
NOTE: If paint has entered the air section, the
piston o-ring (28) may swell. When this occurs,
it is difficult to remove the second diaphragm by
turning the shaft. An alternative method is to
remove the mounting bracket (5) and air manifold
(6). Then, remove the air cover bolts (10) and
separate the air covers (7). Keep the diaphragm
secured with the fluid cover and turn the exposed
pump shaft to remove the second diaphragm.
12. Remove compressed air pressure.
13. Use a hex socket wrench (6 mm for 4D150
models or 8 mm for 4D350 models) to remove
the bolts (15) from the other fluid cover (4).
Remove the cover.
14. The second diaphragm (18) will turn off by
hand. Remove the diaphragm plate (21) and the
washer (40, used only on 4D350 models).
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