Goulds Pumps AF (Axial Flow) (42"/1200mm/54/60"/66") LM/LMR Bearings - IOM" - Manual (Page 48)

48 AF (42-66) IOM
INSPECTIONS
IMPELLER
1. Inspect impeller vanes for damage (101). Check
the vane O.D. for erosion. Check the vane surfaces,
replace if grooved, worn, or eroded deeper than 3/16
in. (5.0 mm.) Excessive impeller wear may cause a
reduction in performance.
2. Inspect the leading and trailing edges of the vanes
for pitting, erosion or corrosion damage replace if
grooved, or worn deeper than 3/16 in. (5.0 mm.)
3. Inspect the root (vane attach point at hub) of each
vane for cracks. Impeller vane failure can cause
unbalance in the rotating assembly that will lead to
catastrophic failure of the pump.
4. Inspect the keyway and stepped bores for signs of
pitting, wear or corrosion damage.
5. Check the O-ring groove and bolt holes for signs of
pitting or corrosion.
SHAFT
1. Check the shaft (122) for straightness, wear,
corrosion, and radial run-out. Maximum run-out for
non-contact portions of the shaft is .002 in. (.05 mm)
max.
2. Bearing seats and seal areas must be smooth and
free of scratches and grooves. Shaft hole threads must
be in good condition. Replace if necessary.
SHAFT SLEEVE
1. The shaft sleeve (126) should be replaced if badly
grooved or worn. Localized wear or grooving
greater than 3/32 in. (2.4 mm) deep is cause for
replacement, see Fig. 50.
BEARINGS
The bearings (112, 112C, and 168C) should be
inspected for contamination and damage. The
condition of the bearing will provide useful information
on operating conditions in the bearing housing.
Lubrication condition and residue should be noted.
Bearing damage should be investigated to determine
the cause. If cause is not normal wear, it should be
corrected before the pump is returned to service.
DO NOT RE-USE BEARINGS.
OIL SEALS, O-RINGS, GASKETS
Although the oil seals (332, 333), O-rings (351A, 351B,
496A, 496B, 496C) and gaskets (360R, 360X,) may
seem OK during inspection and examination, DO NOT
RE-USE SEALS when rebuilding the pump. Replace
them while pump is disassembled.