Flowserve MARK 3 GROUP 4 - Manual (Page 21)

MARK 3 GROUP 4 USER INSTRUCTIONS ENGLISH 71569286 08-12
Page 21 of 48 flowserve.com
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4.5.2.2 V-Belt Drive Units:
Check that both sheaves are free of grease, rust,
nicks or burrs. Install the correct size sheave on the
pump shaft and locate the sheave axially to minimize
overhang. Re-check the impeller axial clearance and
ensure that the pump is properly secured to the
baseplate. Install the driver on the adjustable base
provided and install the driver sheave in line with the
pump sheave. Ensure that the sheaves are tight on
the shafts. With a dial indicator, check the runout on
the periphery and face of each sheave to ensure that
each is running true. Tighten the adjustable base and
check that the driver rotation in the correct direction
and that vibration levels are not unacceptable.
Checking V-Belt Sheave Alignment
Before starting the driver, refer to the
manufacturer’s instruction manual. The correct
rotation of the pump shaft is marked on the pump
casing or frame.
Check that all belts making up one drive set have
matched code numbers. Loosen the adjustable base
and install the belts in their proper grooves. Adjust
the center distance between the sheaves to obtain
proper belt tension. Check the alignment of the pump
and driver sheaves with a taught string or straight
edge. For proper alignment and the sheave faces
must be parallel to each other and in line.
Adjustments are made by slackening the belts,
moving and retightening the drive or driver sheave,
and repeating the above procedure.
When the sheaves are aligned that the shafts rotate
freely by hand and install safety guard.
Belt drives must not be used in ATEX
Potentially explosive environments; refer to
Flowserve.
4.5.3 Parallel Alignment:
Mount the magnetic base on the pump half coupling
hub, either the face or O.D. as shown in the sketch.
Place the dial indicator button on the outside
diameter of the driver half coupling hub.
The length of extension rods should be kept
at a minimum to reduce deflection.
Rotate the pump shaft and record the dial reading at
the top, bottom and each side. Correct the parallel
alignment by adding or removing shims under the
driver and/or moving the driver horizontally. Repeat
this procedure until the maximum total indicator
reading (T.I.R.) is within 0.08 mm (0.003 inch.)
4.5.4 Angular Alignment:
Mount the magnetic base mounted on the pump half
coupling hub, either face or O.D. as shown. Move the
dial indicator button to indicate on the face of the
driver half coupling hub as close to the outside
diameter as possible. When convenient the indicator
can be placed on the inside face to keep spans short.
Turn both shafts 360 ° and record the dial readings at
90 ° intervals. Adjust the shims under the motor as