HALE AP, Technical Manual

Page: 126 / 177

114
AP/CBP/MBP Pump Head Clearance Ring Installation
A. Clean pump head to remove old Loctite. (Use Loctite Clean-Up Solvent and a
wire brush.)
B. Place pump head on stable work surface with drive side down (clearance ring
up).
C. Coat ONLY mating surface of new clearance ring with Loctite 680 as follows.
If AP, coat inner diameter (mating) surface of new clearance ring. 1.
If CBP or MBP, coat outer diameter (mating) surface of new clearance 2.
ring.
NOTES
The pump head and wrap around clearance ring are designed utilizing an interfer-
ence fit. The MBP and the CBP utilize the outer surface of the pump head cavity while
the AP utilizes the inner surface of the pump head cavity to provide that interference
fit.
If the pump under repair is an AP or an MBP ensure the correct clearance ring is be-
ing installed (since both rings will fit in the pump head but ONLY the correct ring will
mate with the impeller).
D. Align new wrap around clearance ring to pump head.
DO NOT DRIVE THE CLEARANCE RING INTO THE PUMP HEAD AT AN ANGLE OR UNE-
VENLY (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 pump head.
E. Using hydraulic press, install clearance ring into pump head.
F. Apply a heavy coating of grease to clearance rings.
NOTE
The grease protects the clearance ring during the initial pump priming to prevent the
ring from contacting the impeller.
RSD Suction Head Clearance Ring Removal
NOTE
Use cribbing to prevent suction head from tipping or moving if required.
A. Place suction head on stable work surface with suction opening down.
DO NOT CUT THRU THE CLEARANCE RING. CUTTING THRU THE CLEARANCE RING
WILL DAMAGE THE SUCTION HEAD AND MAY RESULT IN PUMP FAILURE.
B. Using cutting wheel, cut two slots (180° apart - opposite each other) into
failed clearance ring. See Figure 43.