Flowserve MARK 3 GROUP 4 User Manual

Page 21

MARK 3 GROUP 4 USER INSTRUCTIONS ENGLISH 71569286 08-12

Page 21 of

flowserve.com

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

intervals. Adjust the shims under the motor as