Double Ball Service
Disassemble the Pump
Note: Pump Repair Kits are available. Purchase
the kit separately. See the Parts list for your
displacement pump to select the correct kit for your
displacement pump. Kit parts are marked with an *.
1. Displacement Pump Models 24G748, 24G749,
24G750, 24G753, and 26A158: Remove the two
o-rings/retaining clips (119) and the retaining pin
(127) from the inlet valve housing (107). See the
parts drawing for
Double ball Displacement Pump
Models 24G748, 24G749, 24G753, 24G750, and
26A158, page 19
.
Displacement Pump Models 24G752 and
24G751: Remove the clamp (123) and gasket
(102), then remove the adapter (129). See the
parts drawing for
Double-Ball Displacement
Pump Models 24G752 and 24G751, page 21
.
2. Remove and disassemble the inlet valve
assembly. Clean and inspect the parts.
3. Push the displacement rod (117) out through the
bottom of the cylinder (101). Remove the piston
housing (124) by removing the retaining pin (118)
and the o-ring/retaining clip (119) and pulling the
piston from the displacement rod. Disassemble,
clean and inspect the parts.
4. Take the packing housing (103) off of the cylinder
(101) and remove the bearing (106), packing
(105), and o-ring (104).
5. Clean and inspect all parts. Refer to
Cleaning, page 9
. Replace the parts as
necessary.
Reassemble After Cleaning
Note: Any damaged rubber parts must be replaced
as they could harbor microorganisms that can
contaminate the fluid.
Note: Lubricate the o-rings, throat packings, and
piston seals with waterproof appropriate sanitary
lubricant.
1. Displacement Pump Models 24G748, 24G749,
24G750, and 24G752: Lubricate and install the
piston seal (120*) on the piston housing (124).
Displacement Pump Models 24G751, 24G753,
and 26A158: Lubricate and install the piston
u-cup (128*) on the piston housing (124). The
lips of the u-cup must face up. Install the spacer
(120*) with its lip facing down.
2. Place the ball (110) on the seat of the piston
housing (124). Install the housing in the
displacement rod (117) so the holes in both parts
align. Secure with the retaining pin (118) and
one o-ring/retaining clip (119*).
3. Install the u-cup packing (105*) and throat
bearing (106*) in the throat packing housing
(103). The lips of the u-cup must face down into
the housing, and the lip of the bearing must face
up. Install the o-ring (104*) on the outside of the
housing.
4. Lubricate and install the throat packing housing
(103) in the top of the cylinder (101).
5. Lubricate and slide the displacement rod (117)
up through the cylinder (101) so it protrudes from
the top.
6. Install the o-ring (104*) on the intake valve
housing (107). Place the ball (125) on the seat
of the housing (107), and install the ball stop pin
(126) in the top holes of the housing.
7. Displacement Pump Models 24G748, 24G749,
24G750, 24G753, and 26A158: Lubricate and
slide the intake valve housing (107) up into
the cylinder (101) until the bottom holes of the
housing align with the holes in the cylinder.
Secure using the retaining pin (118) and two
o-rings/retaining clips (119*).
Displacement Pump Models 24G752 and
24G751: Lubricate and slide the intake valve
housing (107) up into the cylinder (101). Install
the gasket (102*), adapter (129), and clamp
(123).
14
3A0733P
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