Service manual

9
After pump-bracket-driver is installed into system and after piping is connected to pump,
shaft alignment should be re-checked and adjusted, if necessary,
When a right-angle foot bracket is used, mount pump onto bracket and tighten pump-to-
bracket mounting bolts. At this point, bracket base, in effect, becomes pump feet.
Continue with aligning procedure as if pump were foot mounted. See Section D.6.3.
A
B
Driver
Mounting Bracket
Dial Indicator
Figure 6 – Alignment of Flange Mounted Pumps
CAUTION ATTENTION
• Be sure all coupling set screws and bolts are tight and coupling gap is properly set.
• Install safety shield(s) or plate(s) over bracket opening(s).
D.6.5 Belts and Sheaves
It is only acceptable to belt drive Imo pumps that are specifically designed for this
purpose. It is generally not acceptable to belt drive pumps with ratings in excess of 600
psi differential pressure. Contact Imo if not sure a particular pump can be belt
driven.
Belts and sheaves must be properly selected aligned and tensioned to minimize belt
wear, eliminate possibility of belt turnover in sheave grooves, and avoid excessive side
load on pump shaft. Adjustable slide rails mounted under driver are recommended for
proper belt tensioning.
Check belt tension frequently during first 24 to 48 hours of run-in operation. Follow belt
drive manufacturer’s recommendations for alignment of sheaves and belt-tension
settings.
CAUTION ATTENTION
Loose, slipping belts will squeal and cause overheating of sheaves leading to reduced
belt life. Excessively tightened belts will result in reduced belt and bearing life and
possible bearing or shaft failure.
Flange Mounted Pumps
Locating bore (A) must be concentric to
driver shaft centerline within 0.002 inch
FIM. Mounting surface (B) must be
perpendicular to driver shaft centerline
within 0.002 inch (0.05 mm) FIM.