Hale SMR - Manual (Page 69)

Stainless Max Series Pumps 4-17
Preventive Maintenance
It should not be necessary to replace clearance rings and impellers
until the average radial clearance exceeds 0.015” to 0.020” (0.381
to 0.508 mm) or more per side as measured with calipers. See
Figure 4-11: “Clearance Ring and Impeller Measurement” on page
4-16.
If the clearance rings on the SM pump show significant wear but the
impeller itself is within the size tolerance, "undersized " clearance
rings can be installed to delay a complete rebuild. Contact Cus-
tomer Service at Hale Products.
Often, replacement of the clearance rings will reduce the bypass
and restore the pump to near original performance. A complete
restoration requires that the impellers also be replaced. See Sec-
tion 6 for maintenance and repair information if pump disassembly is
required.
Anode Check
The zinc anodes should be inspected every 12 months. Replace
when over 75% of the zinc has been consumed. Performance of
the anode life will vary with water quality and pH. Anodes conform to
MIL Spec. A180001.
EXTREME CONDITIONS, MAINTENANCE GUIDELINES
Freezing Weather
1. Drain the pump body and discharge valves.
2. If the gearbox is equipped with a water cooling line, also drain
this line.
3. There should be drains for the gauge lines, the cooling line to the
engine, and to the relief valve (if equipped). All of these should
be opened until all water is drained, then close the drain valves.
4. In freezing weather, drain the pump as follows:
❑
Open the discharge and suction valves, remove suction tube
caps and discharge valve caps.
❑
Open the pump body drain cocks and drain valves
❑
After the pump is completely drained replace all caps and
close all valves.