HALE AP, Technical Manual

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112
AP/CBP/MBP Volute Clearance Ring Installation
A. Clean volute to remove old Loctite. (Use Loctite Clean-Up Solvent and a wire
brush.)
NOTE
Use cribbing to prevent volute from tipping or moving if required.
B. Place volute on stable work surface with suction opening down.
C. Coat ONLY outer mating surface of new clearance ring with Loctite 680.
D. Align new clearance ring to volute.
DO NOT DRIVE THE CLEARANCE RING INTO THE VOLUTE AT AN ANGLE OR UNEVENLY
(ALL THE WAY FROM ONE SIDE AT A TIME). BENDING, WARPING, OR CHIPPING THE
CLEARANCE RING MAY RESULT IN POOR PERFORMANCE OR PUMP FAILURE.
NOTE
A circular piece of plate steel the size of the outside diameter of the clearance ring
may be used to prevent the ring from tipping or jamming inside the volute.
E. Using hydraulic press, install clearance ring into volute.
AP/CBP/MBP Pump Head Clearance Ring Removal
The AP and MBP utilize the same pump head however; each pump utilizes a different sized wrap
around clearance ring. The AP wrap around clearance ring presses onto the inside shoulder of
the pump head cavity while the MBP wrap around clearance ring presses on to the outside
shoulder. The CBP is similar to the MBP configuration however; the CBP utilizes both a different
pump head and a different sized wrap around clearance ring. All of the pump heads utilize a
raised center hub (supports the pump seal and pump shaft) and wrap around clearance rings
(must stronger structurally than typical rings) which dictate the use of the following method to
remove the wrap around clearance ring.
A. Place pump head in a vise with drive side down (clearance ring up).
DO NOT DRILL INTO THE PUMP HEAD HOWEVER DRILL THRU THE CLEARANCE RING.
DRILLING INTO THE PUMP HEAD WILL DAMAGE THE PUMP HEAD AND MAY RESULT
IN PUMP FAILURE.
B. Using drill with 1/4-in bit, drill two holes approximately 1-in apart into failed
clearance ring (directly over one of the three (3) recesses (voids) in the pump
head). See Figure 40 and Figure 41.
NOTES
•
Start the drill before contacting the material to help prevent the bit from binding in
the impeller groove.
•
Start the bit at approximately a 45° angle (spanning the impeller groove) then slowly
increase the angle until drilling straight down into the impeller groove.
•
Feed the bit into the material very slowly to help prevent the bit from binding.