859.0089
15
Reassembly
Follow all notes in F
IG
. 7. These notes contain
important information.
NOTE: Apply lithium-based grease whenever instructed
to grease. Order Verder part number 819.0184.
1.
Clean all parts and inspect for wear or damage.
Replace parts as needed.
2.
If removed, grease and install the new pilot valve car-
tridges (102) and o-rings (103). Screw in until seated.
NOTE: Cartridges (102) must be installed before pilot
valves (101).
3.
Grease and install the pilot valves (101). Torque to
20-25 in.-lb (2.3-2.8 N•m). Do not over-torque.
4.
Grease and install the diaphragm shaft u-cup pack-
ings (106) so the lips face out of the housing.
5.
If removed, insert the new bearings (105) into the
center housing. Use a press or a block and rubber
mallet to press-fit the bearing so it is flush with the
surface of the center housing.
6.
Overmolded Diaphragms:
a.
Clamp the shaft flats in a vise.
b.
If diaphragm setscrew comes loose or is
replaced, apply permanent (red) Loctite
®
or
equivalent to diaphragm side threads. Screw into
diaphragm until tight.
c.
Assemble the air side plate (14) onto the dia-
phragm. The rounded side of the plate must face
the diaphragm.
d.
Apply medium-strength (blue) Loctite or equiva-
lent to the threads of the diaphragm assembly.
Screw the assembly into the shaft as tight as
possible by hand.
e.
Grease the shaft u-cups (106) and the length and
ends of the diaphragm shaft (104). Slide the
shaft into the housing.
f.
Reattach the first fluid cover (3). See Torque
Instructions, page 16.
g.
Repeat Steps b and c for the other diaphragm
assembly. Go to Step 7.
All Other Diaphragms - Metal Pumps:
a.
Install the o-ring (301) on the shaft bolt (304).
b.
Assemble the fluid side plate (13), the diaphragm
(15), the backup diaphragm (305, if present), and
the air side diaphragm plate (14) on the bolt
exactly as shown in F
IG
. 7.
c.
Apply medium-strength (blue) Loctite or equiva-
lent to the bolt (304) threads. Screw the bolt into
the shaft hand tight.
d.
Grease the shaft u-cups (106) and the length and
ends of the diaphragm shaft (104). Slide the
shaft into the housing.
e.
Repeat Steps a-c for the other diaphragm
assembly.
f.
Hold one shaft bolt with a wrench and torque the
other bolt to 20-25 ft-lb (27-34 N•m) at 100 rpm
maximum. Do not over-torque.
g.
Reattach the first fluid cover (3). See Torque
Instructions, page 16. Go to Step 7.
All Other Diaphragms - Plastic Pumps:
a.
Assemble the diaphragm (15), the backup dia-
phragm (305, if present), and the air side dia-
phragm plate (14) on the fluid side plate (13)
exactly as shown in F
IG
. 7.
b.
Apply medium-strength (blue) Loctite or equiva-
lent to the threads of the screw on the fluid side
plate. Screw the assembly into the shaft
hand-tight.
c.
Grease the shaft u-cups (106) and the length and
ends of the diaphragm shaft (104). Slide the
shaft into the housing.
d.
Repeat for the other diaphragm assembly
e.
Hold one of the plates with a wrench, and torque
the other plate to 20-25 ft-lb (27-34 N•m) at 100
rpm maximum. Do not over-torque.
f.
Reattach the first fluid cover (3). See Torque
Instructions, page 16.
Summary of Contents for VERDERAIR VA 25
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