Graco Husky 1040 Instructions-Parts List Manual page 20

4. Unscrew one outer plate (105) from the diaphragm
shaft (24). Remove one diaphragm (401), and the
inner plate (104). See Fig. 13.
For overmolded diaphragms: Grip both diaphragms
securely around the outer edge and rotate
counterclockwise. One diaphragm assembly will
come free and the other will remain attached to the
shaft. Remove the freed diaphragm and air side
plate.
NOTE: PTFE models include a PTFE 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 open–end wrench,
and remove the outer plate (105) from the shaft.
Disassemble the remaining diaphragm assembly.
For overmolded diaphragms: Pull the other
diaphragm assembly and the diaphragm shaft (24)
out of the center housing (1). Hold the shaft flats
with a 19 mm open–end wrench, and remove the
diaphragm and air side plate from the shaft.
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 23.
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.
Replace parts as needed.
20 308443
Service
Reassembly – Standard Diaphragms
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),
diaphragms (401*), PTFE diaphragms (403*, if
present), and outer diaphragm plates (105) exactly
as shown in Fig. 13. These parts must be
assembled correctly.
4. Apply medium-strength (blue) Loctite® 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 130 to 150 in-lb (14 to 17 N-m), using a 10
mm socket wrench. Then torque the shorter screws
(112). See Torque Sequence, page 32.
7. Reassemble the ball check valves and manifolds as
explained on page 18.