Graco Husky 205 D120 Series Instructions Manual page 14

Replacing Diaphragms
Replace the diaphragms as follows. See F
1. Relieve the pressure, and disconnect the air line
from the pump.
WARNING
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
2. Remove the eight screws (58) that fasten the two
fluid covers (51) to manifold (52), and remove the
fluid cover/center housing assembly from the
manifold.
3. Remove the six screws (58) that fasten each fluid
cover (51) to the center housing (1), and pull the fluid
covers off of the center housing.
4. Remove the diaphragm plates (50) from the shaft
(10), and remove the diaphragms (30), and air-side
diaphragm plates (11).
1
 Service kits include two types of o-rings (57): thin cross section and thick
cross section o-rings. Use thin cross section o-rings on Acetal and PVDF
pump series A to E and Polypropylene pump series A to H. Use thick
cross section o-rings on Acetal and PVDF pump series F and later and
Polypropylene pump series J and later. Discard unused o-rings.
F . 6.
IG
14 308652ZAS
Service
. 6 and F . 7.
IG IG
9
8
12
10
11
57
30
5. Remove the diaphragm pins (8), remove and replace
the o-rings (9), and reinstall the diaphragm pins in the
center housing (1).
6. Grease the length of the shaft (10), and slide it
through the center housing (1).
NOTE: Use lithium-base grease, part no. 111920
(Lubriplate 630AA or equivalent).
7. Install the new diaphragms (30) with the concave
side toward the center housing (1).
8. Screw the diaphragm plates (50) onto the shaft (10),
and torque to 28-33 in-lb (3.2-3.7 Nm).
9. Reinstall the fluid covers (51) on the center housing
(1), install the screws (58) that fasten the fluid covers
to the center housing, and torque to 42-47 in-lb
(4.7-5.3 Nm). See Torque Sequence on page 20.
10. Reinstall the fluid covers/center housing assembly on
the manifold (52), install the screws (58) that fasten
the fluid covers/center housing assembly to the
manifold, and torque to 42-47 in-lb (4.7-5.3 Nm).
See Torque Sequence on page 20.
11. Reconnect the pump.
50
58
51
58
06180e