Installation, Operation, & Maintenance Guide
Style 78HT
VERIFICATION
Successful operation of a Style 78HT seal is contingent on conforming equipment dimensions and alignment.
Verify the following prior to continuing:
Figure 2: Shaft Runout
Figure 3: Bearing Fit
Figure 4: Bearing Frame
Perpendicularity
Figure 5: Axial Shaft
Movement
Figure 6: Seal Chamber
Bore Concentricity
Figure 7: Seal Chamber
Face Squareness
Maximum Alignment Variation (TIR)
Fig.
Radial shaft movement (shaft runout)
0.0015–0.003 in.
Fig.
Radial bearing fit
0.002–0.003 in.
Fig.
Bearing frame perpendicularity
0.0005 in./in.
Fig.
Axial shaft movement (end play)
0.003 in.
Fig.
Seal chamber bore concentricity
0.005 in.
Fig.
Seal chamber face squareness
0.0005 in./in.
For proper function and satisfactory operation of the seal it is imperative that connections, dimensions, finishes,
and alignments are all acceptable based on the specified design. If measured values exceed the values given
above, adjust the equipment to meet the specifications before installing the seal. These values are general
guidelines and the pump OEM should be used to verify acceptable values whenever possible.
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