PUMP DISASSEMBLY
NOTICE:
FOLLOW ALL HAZARD WARNINGS AND
INSTRUCTIONS PROVIDED IN THE "MAINTENANCE"
SECTION OF THIS MANUAL.
1. Drain and relieve pressure from the pump and system as
required.
2. Starting on the
inboard
(driven) end of the pump, clean the
pump shaft thoroughly, making sure the shaft is free of
nicks and burrs. This will prevent damage to the
mechanical seal when the inboard head assembly is
removed.
3. Remove the inboard bearing cover capscrews (28) and
slide the inboard bearing cover (27) and gasket (26) off the
shaft. Discard the bearing cover gasket.
4. Remove the outboard bearing cover capscrews (28) and
slide the outboard bearing cover (27) and gasket (26) off
the shaft. Discard the bearing cover gasket.
5. To remove locknuts and lockwashers (24A and 24B):
a. Bend up the engaged lockwasher tang and rotate the
locknut (24A)counterclockwise to remove it from the
shaft
MAINTENANCE
9
VANE REPLACEMENT
NOTICE:
MAINTENANCE SHALL BE PERFORMED BY QUALIFIED
TECHNICIANS ONLY, FOLLOWING THE APPROPRIATE
PROCEDURES AND WARNINGS AS PRESENTED IN
THIS MANUAL.
1. Drain and relieve pressure from the pump and system as
required.
2. Remove the head assembly from the
outboard
(non-
driven) side of the pump according to steps 4 - 7 in the
"Pump Disassembly" section of this manual.
3. Turn the shaft by hand until a vane (14) comes to the top,
(12 o'clock) position, of the rotor. Remove the vane.
4. Install a new vane (14), ensuring that the rounded edge is
UP, and the relief grooves are facing towards the direction
of rotation. See Figure 7.
5. Repeat steps 3 and 4 until all vanes have been replaced.
6. Reassemble the pump according to the "Pump Assembly."
section of this manual.
Figure 7 - Vane Installation
b. Slide the lockwasher (24B) off the shaft. Inspect the
lockwasher for damage and replace as required.
c. Repeat steps a and b on the opposite shaft end.
6. Remove the head capscrews (21) and carefully pry the
head (20) away from the casing (12).
7. Slide the head (20) off the shaft. The head O-ring (72),
disc (71), bearing (24), and mechanical seal (153) will
come off with the head assembly. Remove and discard the
head O-ring.
a. Remove the four disc machine screws and lockwashers
(71A & 71B) to release the disc (71) from the head (20).
b. Carefully pull the rotating seal assembly, consisting of
seal jacket (153C), rotating seal face and rotating O-
ring (153B & 153E) from the head (20). Remove and
discard the rotating O-ring.
c. Pull the bearing (24) from the housing in the head (20).
d. To remove the mechanical seal stationary seat (153A),
use the blunt end of a screw driver to gently push the
backside of the stationary seat from the head. Place a
cloth under the seal to avoid damage. Be careful not to
contact the polished face of the seal during removal.
Remove and discard mechanical seal stationary O-ring.
8. Carefully pull the rotor and shaft (13) from the casing (12).
While one hand is pulling the shaft, cup the other hand
underneath the rotor to prevent the vanes (14) and push
rods (77) from falling out. Carefully set the rotor and shaft
(13) aside for future vane replacement and reassembly.
NOTICE:
THE ROTOR AND SHAFT WEIGHS APPROXIMATELY 69
POUNDS (31KG). BE CAREFUL NOT TO PINCH THE
HAND UNDER THE ROTOR AND SHAFT WHEN
REMOVING FROM THE CASING.
9. Lay the pump flat with the remaining head (20) facing
upward to remove the head assembly, mechanical seal
(153) and disc (71) from the outboard side of the pump, as
instructed in steps 6 - 7 above.
10. If necessary, remove the liner (41) by tapping around the
outside diameter of the liner with a hard wood drift and a
hammer until it is driven from the casing (12).
PUMP ASSEMBLY
Before reassembling the pump, inspect all component
parts for wear or damage, and replace as required. Wash
out the bearing /seal recess of the head and remove any
burrs or nicks from the rotor and shaft. Remove any
burrs from the liner.
Reassemble the OUTBOARD side of the pump first:
1. Apply a small amount of grease to the liner key (74) to hold
the key in place during liner installation. Install the liner
key in groove of the liner before starting liner into pump
casing (12).
