MAINTENANCE
10
Figure 8 - Disc Relief Hole Location
4. Place the disc (71) against the head (20) with disc relief
hole located so that when the head is mounted on the
pump with the “Blackmer” name in an upright position, the
relief hole will be at the pump intake, 9 o’clock position on
CRL4 pump and 12 o’clock position on discontinued
TCRLF4A pumps (see Figure 8). Install and tighten the
disc machine screws and lockwashers (71A & 71B). The
drive tangs of the seal jacket must protrude through the
center hole of the disc.
5. Install a new head O-ring (72) in the groove on the inside
face of the head (20). Lay the O-ring flat and start in on
one side of the groove, stretching ahead with the fingers,
as shown in Figure 9.
6. Carefully install the head assembly (20) on the pump
casing (12). Rotate the head so that the drain hole,
located at the back of the bearing cavity, faces downward
when the pump is mounted for operation and the disc relief
hole is located at the intake port. Install and uniformly
tighten four head capscrews (21) 90
o
apart, torquing to 30
lbs ft (47 Nm).
7. Hand pack the ball bearing (24) with grease. Refer to the
"Lubrication" section for the recommended grease.
8. Install the bearing (24) into the head recess. The bearing
balls must face outward, with the grease shield inward.
Ensure the bearing is fully and squarely seated in the head
(20).
9. Turn the pump casing around to begin work on the
opposite side of the pump.
10. Remove the vanes (14) and push rods (77) from the rotor
and shaft assembly (13). Inspect for wear and damage,
and replace as follows:
a. Apply a small amount of lubricating oil on the shaft
between the shaft threads and the rotor.
b. Partially install the non-driven end of the rotor and shaft
(13) into the open side of the pump casing (12).
c. Leave part of the rotor outside of the casing (12) so that
the bottom vanes (14) can be installed and held in place
as the push rods (77) are installed in the push rod holes
of the rotor. Insert the new vanes into the rotor slots
with the rounded edges outward, and the vane relief
grooves facing TOWARDS the direction of rotation.
Refer to Figure 7.
d. After the bottom vanes (14) and push rods (77) are
installed, carefully insert the rotor and shaft (13) fully
into the casing (12) and through the installed head (20).
e. Install the remaining vanes (14) into the top positions of
the rotor.
f. Turn the shaft by hand to engage the seal drive tangs.
11. Install the inboard head with O-ring (72), mechanical seal
(153), disc (71) and bearing (24) as instructed in steps 3
through 8.
12. Rotate the shaft by hand to engage the mechanical seal
drive tangs, and to test for binding or tight spots. If the
rotor does not turn freely, lightly tap the rims of the heads
(20) with a soft faced mallet until the correct position is
found. Install all of the remaining head capscrews (21) for
each head (20) and uniformly torque to 30 lbs ft (47 Nm).
Figure 9 - Head O-ring Installation
2. Align the liner key (74) with the pump casing keyway and
start the liner (41) into the casing (12) with the slots in the
liner towards the INTAKE port and the hole pattern in the
liner towards the DISCHARGE port. Uniformly tap the
outer edge of the liner with a rubber mallet to fully insert
into the casing.
NOTE:
If the liner is installed backwards,
it will restrict the port openings and cause noise and loss of
capacity.
3.
MECHANICAL SEAL INSTALLATION
Stationary Seat -
a. Apply a small amount of lubricating oil in the seal
recess of the head.
b. Install a new stationary O-ring (153D) in the stationary
seat (153A). Clean the polished face with a clean
tissue and alcohol. Align the pin in the stationary seat
with the slot in the head recess and push the seat fully
into the seal recess with the polished face outward.
Rotating Assembly -
a. Install a new rotating O-ring (153E) in the rotating seal
face (153B). Clean the polished face with a clean
tissue and alcohol. Place the polished face of the
rotating seal against the face of the stationary seat in
the head recess.
b. Align the seal jacket assembly (153C) with the notches
of the rotating face and install jacket with the drive
tangs of the jacket outward.
CRL4A, TCRL4
TCRLF4A
INTAKE
INTAKE
Disc Relief Hole
Disc Relief Hole
