MDX [en-US]
28
8
Mechanical End
8.1
Mechanical End Overview
The bearing assembly is a cartridge design mounted on a fabricated pedestal with an adjustment mechanism for setting
the impeller axial clearance.
The conventional bearing arrangement utilizes two double row, spherical roller bearings to carry the drive and impeller
end radial loads. A separate spherical roller thrust bearing is provided to carry the hydraulic axial thrust without any
requirement of thrust compensating clearing vanes on the impeller. The radial bearings are fixed to the shaft with
tapered sleeves and locknuts. The thrust bearing is preloaded with springs to provide the constant minimum thrust load
required by this type bearing. The bearing housing is split for ease of maintenance and assembly.
The Limited End Float (LEF) bearing assembly is used for mechanical seal applications or operations where tight
impeller nose clearances are needed. The drive end radial bearing is converted to a taper roller bearing to greatly
reduce the shaft end play.
Standard lubrication is oil bath. See Section 6.1.1 "Bearing Lubrication" for lubrication quality and quantity. For bearing
part numbers refer to the assembly drawing and bill-of-materials.
Conventional Bearing Assembly with Non-Standard Straight Shaft
Limited End Float Bearing Assembly with Standard Stiffened Shaft
8.2
Mechanical End Disassembly
GIW REGEN Service Centers remanufacture bearing assemblies and refurbish pumps.
GIW will rebuild your assembly and return it to its original specifications using genuine OEM replacement parts.
Contact your GIW / KSB Sales Representative for details.
WARNING
Refer to Section 2.9 "Assembly & Disassembly Safety" prior to working on the pump.
CAUTION
Recommended Lifting Device
Avoid excessive lifting force which may cause the top half to
suddenly break free and bounce against the bearings or injure
maintenance personnel. Do not use flexible lifting equipment, such
as nylon slings which may stretch and exaggerate bouncing. Failure
to use a lifting bar or chain spreader could result in damage to the
housing.
Drain the oil by removing the drain plug in the end cover at either end.
Remove the flingers and bearing housing end covers. Inspect the shaft seals, gaskets and o-rings, replace if broken or
worn.
Remove the bolts holding the bearing housing halves together. Note that the housings halves are tightly doweled
together to ensure alignment of the bearings and removal of the upper half may be difficult. Install eyebolts and jam
nuts. Use a lifting bar or chain spreader to apply a vertical force to the eyebolts when lifting. If necessary, insert a pry
bar between the halves and lift evenly, taking care not to damage the sealing surfaces.
The shaft and bearings may now be removed from the housing. Different methods may be required for removal of the
bearings from the shaft.
In Conventional bearing assemblies the radial bearings on either end of the shaft are typically double row, spherical
roller bearings and are held to the shaft by a tapered sleeve with locknut and lock washer. One tab of the lock washer
will be bent into a recess on the lock ring and must be bent back to allow the locknut to be unscrewed. The bearing can
then be slipped off the shaft.
Summary of Contents for GIW MDX
Page 53: ...MDX en US 53 14 Notes...
