110-A01: Page 10/14
MAINTENANCE
PUMP ASSEMBLY
NOTICE:
Follow all hazard warnings and instructions provided in
the "maintenance" section of this manual.
Containment shell failure will permit
fluid leakage and can cause serious
injury.
Hazardous or toxic
fluids can cause
serious injury.
Before reassembling the pump, all parts should be thoroughly
cleaned and inspected for wear, damage, and replaced as
necessary. Remove any burrs from the rotor and mating
cylinder.
NOTICE:
The containment can (50) must be replaced if any
cracking, wear or other damage is present.
1. Begin assembly on the outboard side of the pump, by
laying the pump cylinder (12) on a flat surface with the
desired outboard side facing up.
2. Inspect both sleeve bearings (24) for damage or wear. If
damaged, bearings MUST be replaced. To replace
bearings:
a. Using an appropriately sized arbor press, remove the
old bearing from the head.
b. To aid installation and prevent damage, heat the head
in an oven to 200°F (93°C).
c. Coat the new bearing with a quality grade of bearing
grease, and place it on the inside face of the head
with the notched end UP.
Align the notch in the
bearing with the groove in the head. See Figure 9.
d. Using an arbor press, CAREFULLY press the bearing
into the head until it is flush with the inside face of the
head. Ensure that the bearing does not become
misaligned during the pressing activity.
Figure 9 – Bushing Installation Orientation
3. Install the head o-ring (72) into the outboard head (23 o-
ring groove. Use a chemically compatible, high viscosity
grease to hold o-ring into the groove. Place head onto
cylinder (12), with the cast locating notch facing up for right
hand built pumps and down for left hand builds. See
Figure 10.
Figure 10 – Outboard Head Orientation
4. Lubricate the outboard head capscrews (21) with a quality
grade of anti-seize compound and install, torqueing to 25 ft-
lbs (34Nm).
5. Install a new bearing cover o-ring (26) in the groove in the
outboard head. Place the bearing cover (27) on the head.
Lubricate the bearing cover capscrews (28) with a quality
grade of anti-seize compound and install. Torque to 25 ft-
lbf (34Nm)
6. Turn the pump cylinder over so that it rests on the installed
outboard head and bearing cover. Provide support to
eliminate tipping.
7. Inspect the vanes (14) and push rods (77) for wear and
damage, and replace as follows:
a. The push rods MUST be installed before installing the
rotor and shaft (13) into the pump cylinder. To do so,
hold the rotor and shaft vertical, with the non-driven
(shorter end) down. See Figure 8 for optional location
of lifting lug to aid in installation. Slide the push rods
into the push rod holes of the rotor, then insert the
rotor/shaft into the open end of the pump cylinder.
See Figure 8 for optional location of lifting lug to aid in
installation. Do not let rotor/shaft drop or damage
bushing. Push rotor towards seal point, while
lowering, to help guide the shaft into the bushing See
Figure 11.
b. Insert new vanes (14) into the rotor slots with the
rounded edges outward, and the vane relief grooves
facing TOWARDS the direction of rotation. Refer to
Figure 4 If necessary, move the push rods with a
small screwdriver to install the vanes.
Figure 11 – Rotor/Shaft Installation Tip
