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ØA
Figure 10: 5x5x7B impeller trim — 0.125 in. (3.17 mm) increments
A
Hydraulic diameter, nominal, as
shown on selection curves
From maximum diameter 7 in.
(177.8 mm) to 6.125 in. (155.6 mm)
6, 5.875, 5.75, 5.625 in. (162.4 to
142.9 mm)
5.5, 5.375, 5.25, 5.125, minimum 5
in. (139.7 to 127.0 mm)
6.3 Pre-assembly inspections
Guidelines
Before you assemble the pump parts, make sure you follow these guidelines:
• Inspect the pump parts according to the information in these pre-assembly topics
before you reassemble your pump. Replace any part that does not meet the required
criteria.
• Make sure that the parts are clean. Clean the pump parts in solvent in order to remove
oil, grease, and dirt.
NOTICE:
Protect machined surfaces while you clean the parts. Failure to do so may result in
equipment damage.
6.3.1 Replacement guidelines
Impeller replacement
This table shows the criteria for replacing the impeller:
Impeller parts
Impeller vanes
Vane edges
Gaskets, O-rings, and seats replacement
• Replace all gaskets and O-rings at each overhaul and disassembly.
• Inspect the seats. They must be smooth and free of physical defects.
Marlow Series e-580 INSTRUCTION MANUAL
C
ØB
B
Diameter at impeller inlet side
shroud
Use diameter from selection curves
B = A plus 0.250 in. (6.35 mm)
B = A plus 0.375 in. (9.53 mm)
When to replace
• When grooved deeper than 1/16 in. (1.6 mm), or
• When worn evenly more than 1/32 in. (0.8 mm)
When you see cracks, pitting, or corrosion damage
6 Maintenance
C
Trim angle
0 degrees, no angle
8 degrees
8 degrees
21
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