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MAINTENANCE
VANE REPLACEMENT
NOTICE:
Maintenance shall be performed by qualified technicians
only. Following the appropriate procedures and
warnings as presented in manual.
1. Drain and relieve pressure from the pump and system as
required.
2. Remove the head assembly from the outboard
(nondriven) side of the pump according to steps 4 - 9 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 8.
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 8 – Vane Replacement
PUMP DISASSEMBLY
NOTICE:
Follow all hazard warnings and instructions provided in
the “maintenance” section of this manual.
NOTE:
The numbers in parentheses following individual parts
indicate reference numbers on the Pump Parts List.
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. On the 2-
inch models, the dirt shield (123A) will come off with the
bearing cover.
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. On the 2-
inch models, the dirt shield (123A) will come off with the
bearing cover.
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
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),
bearing (24), mechanical seal stationary seat and
stationary O-ring (153A & 153D) will come off with the
head assembly. Remove and discard the head O-ring.
a. Pull the bearing (24) from the housing in the head
(20).
b. 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 rotating seal assembly, consisting of
seal jacket (153C), rotating seal face and rotating O-ring
(153B & 153E) from the shaft. Remove and discard the
rotating O-ring (153E).
9. Carefully remove the disc (71).
10. 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 aside for future vane replacement and reassembly.
NOTICE: The rotor and shaft weighs approximately 34
pounds (15 kg). Be careful not to pinch the hand under
the rotor and shaft when removing from casing.
11. 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 - 9 above. 12. 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).
PARTS REPLACEMENT
1. If any of the O-rings have been removed or disturbed
during disassembly, they be replaced with new O-rings.
NOTE:
PTFE O-rings should be heated in hot water to aid
installation.
2. Excessive or continuous leakage from the tell-tale hole in
the bearing cover may be an indication of a damaged
mechanical seal. If a mechanical seal has been leaking, it
is recommended the entire seal be replaced. Refer to
"General Pump Troubleshooting" for possible causes of
seal leakage.
