801-B00 Page 13/24
MAINTENANCE
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 10.
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 10 – Vane Installation
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. On 2-inch
models, the dirt shield will slide 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.
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.
For Single Seal Pump Follow Steps 6 – 11,
For Double Seal Pump Skip to Step 12
Single Seal Disassembly
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. On 4-inch models, the disc and rotating
seal assembly will also come off with the head assembly.
Remove and discard the head O-ring.
a. 4-inch models: Remove the four disc machine
screws and lockwashers (71A & 71B) to release the
disc (71) from the head (20). The mechanical seal
rotating assembly (153B, 153C & 153E) will be
released when the disc is removed.
b. Pull the bearing (24) from the housing in the head
(20).
c.
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. 2 and 3-inch models: Carefully pull the rotating seal
assembly, including the seal jacket, rotating seal face and
O-ring (153C, 153B, 153E) from the shaft. Remove and
discard the rotating O-ring. Remove the disc (71).
NOTICE
:
The rotor and shaft weighs 34 - 69 pounds (15 -
31 kg). Be careful not to pinch the hand under
the rotor and shaft when removing from casing.
9. 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.
10. 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,
per steps 6 - 8 above.
11. 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).
