Hale Q Series Muscle - Manual (Page 89)

87 MUSCLE (Midship) Pumps Installation, Operation, and Maintenance Manual
p/n: 029-0020-63-0
Preventive Maintenance 
rings is only a few thousandths of an inch when new. In clear water, the clearance
rings continue to effectively seal for many years of operation.
In dirty or sandy water, the impeller hub and clearance rings wear faster. The more
wear, the greater the bypass and lower pump performance.
It should not be necessary to replace clearance rings until a loss in pump perfor-
mance is noticed during the annual test – see “Performance Testing” on page 84.
Often, replacement of the clearance rings reduces the bypass and restores the pump
to near original performance. A complete restoration requires that the impeller also be
replaced. See Section 7 “Repair and Corrective Maintenance” on page 103 for main-
tenance and repair information if pump disassembly is required.
Anode Check
(See Figure 5-3: “Hale 1-1/4” NPT Anode” on page 87.)
Anodes conform to MIL Spec. A180001. Performance of the anode life varies with
water quality and pH.
Replace anodes when over 75% of the metal has been consumed.
Zinc anodes -
Inspect every twelve (12) months and
replace accordingly.
Magnesium anodes -
Inspect every three (3) months and
replace accordingly.
Figure 5-3: Hale 1-1/4” NPT Anode