Which wet-end materials are available for KREBS slurry pumps?

FLS lists elastomers, high-chromium alloys and polyurethane, with tungsten carbide laser cladding for extreme abrasion. Confirm the material against component location, particle size, concentration, corrosion, pressure, speed and the original design.

Which pumps are covered by the Quick Release System?

Official FLS documentation lists millMAX, slurryMAX-XD and UMD sizes 14×12 inches (350×300 mm) and larger. Confirm the base, wet-end module and lifting assembly for the individual installation.

FLS KREBS Slurry Pump Models and Spare Parts

Q: Are parts interchangeable between millMAX, slurryMAX and UMD pumps of the same size?

Pump size alone does not establish interchangeability. Casing design, liners, impellers, wear rings, shaft seals, pressure ratings and power frames differ. Confirm the full series, size, suffix, rotation, discharge orientation, serial number and drawings.

Installed millMAX pump shown in the official FLS manual, with the metal wet end, suction inlet, discharge outlet, casing and power end visible.

Installed slurryMAX split-casing pump shown in the official FLS manual. Its outer casing, liners and wet-end arrangement differ from millMAX.

Installed UMD mill discharge pump shown in the official FLS manual, for checking the large wet end, piping and base arrangement.

OEM Equipment Details

Pump Series, Sizes, Wet-End Parts, Drive Spares and Maintenance Tools

The same pump size does not establish part interchangeability. Before quoting, match the series, full size, suffix, pressure rating, rotation, discharge orientation, impeller, casing and liners, wear ring, shaft seal, power frame and drawings to the same pump.

9 Verified Series Identification Entries

6 Core Wet-End Wear Parts

5 Drive and Seal Components

2 OEM Maintenance Systems

Series, Models and Key Dimensions

millMAX, millMAX-e, slurryMAX, UMD and Related Pumps

Standard sizes come from current FLS KREBS manuals and support equipment identification. They do not replace hydraulic selection or establish wet-end part interchangeability.

Series	Design / Version	Standard Sizes or Range	Main Applications	Required spare identification
millMAX	Heavy-duty metal wet end	3×2, 4×3, 6×4, 8×6, 10×8, 12×10, 14×12, 16×14, 18×16, 20×18, 24×20, 28×26	Mill discharge and highly abrasive slurry; adjustable wear ring for suction-side sealing	Confirm pump size, impeller, casing, wear ring, rotation, discharge orientation and power frame together
millMAX HP / HH	High pressure / high head	HP：14×12, 20×18, 24×20; HH：3×2, 4×3, 6×4, 8×6, 10×8, 12×10	Multistage high-pressure or high-total-head duties; HP is suitable for applications above 500 psi (35 bar)	Do not substitute parts solely by standard millMAX size; check casing pressure rating and concentric or volute design
millMAX-e	Compact, efficient medium-duty pump	2×1.5, 3×2, 4×3, 6×4, 8×6, 10×8, 12×10, 14×12, 16×14	Mineral sands, alumina, extraction, dilute media, seal water, fine coal, thickener overflow and tailings return water	Check impeller diameter, wear ring, casing, shaft seal, power frame and motor configuration
slurryMAX	Heavy-duty split casing	3×2, 4×3, 6×4, 8×6, 10×8, 12×10	Replaceable liners and a choice of impeller materials, with an adjustable wear ring	Confirm standard / XD / HP / XHP series, liners, outer casing and pressure rating
slurryMAX XD / HP / XHP	Extra-duty / high-pressure split casing	XD: 2×2 to 20×18; HP: 4×4 to 16×14; XHP available in 16×14	Highly abrasive duties, cyclone feed, tailings and multistage high-pressure applications	XD, HP and XHP differ in casing strength; confirm wet-end materials and part numbers using the full suffix
UMD Ultimate Mill Discharge	Heavy-duty mill discharge pump	6×5, 8×6, 10×8, 12×10, 14×12, 16×14, 18×16, 20×18, 22×20, 26×22, 28×26, 32×28, 34×32, 38×34	Hard-rock mill discharge; published flow range 50–20,000 m³/h	Check standard / high-pressure / fully rubber-lined version, rotation, liners and wet-end drawings
gravelMAX	Slurry pump for large particles	Confirm against project selection documents	Wide passages and large-particle handling for abrasive slurry containing coarse solids	Check impeller passages, particle size, suction inlet, casing and discharge orientation
hMAX	Horizontal recessed-impeller pump	Confirm against project selection documents	Duties involving entrained air, shear-sensitive products, fibres or large particles; concentric casing and large internal clearances	The recessed impeller differs from the standard millMAX wet end; appearance alone does not establish compatibility
vMAX / vMAX-R	Vertical cantilever pump	Confirm against project selection documents	Sumps, aerated slurry and solids handling; published maximum particle size is up to 56 mm, depending on model	Check immersion depth, vertical shaft, impeller, liners, bottom suction arrangement and mounting frame

Wear Parts

Impellers, Casings, Liners, Throatbushes and Adjustable Wear Rings

Follow the slurry path from the suction inlet through the impeller to the volute discharge. Each component links to its common part page and relevant material page.

Impeller

The main rotating wet-end component. Check pump series and size, impeller outside diameter, width, blade count, rotation, passages, eye, threaded or shaft connection, balance grade, discharge orientation and duty point.

Material and manufacturing checks:FLS lists high-chromium alloys, elastomers and polyurethane for wet-end components, with tungsten carbide laser cladding available for extreme abrasion. Confirm material against particle size, concentration, corrosion, speed and the original design.

High-Chromium Cast Iron Rubber and Polyurethane Ceramics and Cemented Carbides

View Part Details →

Volute / Casing Liner

Contains high-velocity slurry leaving the impeller and forms the discharge passage. Check the millMAX metal casing or slurryMAX / UMD split-casing design, pump size, rotation, discharge orientation, liner segmentation, thickness and flanges.

Material and manufacturing checks:Select high-chromium wear alloys, elastomers or polyurethane according to coarse-particle impact, fine-particle abrasion, corrosion, pressure and allowable impeller peripheral speed.

High-Chromium Cast Iron Rubber and Polyurethane

View Part Details →

Throatbush / Suction Bushing

Throatbush / Suction Liner

Located at the suction inlet ahead of the impeller eye; together with the adjustable wear ring, it affects suction-side clearance. Check pump size, bore, profile, register, thickness, hole pattern, wear-ring interface and front impeller clearance.

Material and manufacturing checks:Confirm high-chromium alloy, elastomer or polyurethane against suction velocity, particle abrasion, impact and compatibility with the wear ring.

High-Chromium Cast Iron Rubber and Polyurethane

View Part Details →

Front Liner / Front Cover Liner

Front Liner / Frame Plate Liner

Protects the suction-side casing and forms the wet end with the throatbush, impeller and sealing faces. Check series, size, internal profile, thickness, hole pattern, seal grooves, wear-ring interface and assembly orientation.

Material and manufacturing checks:Select the material together with the casing, impeller, throatbush and slurry duty. Matching pump size alone does not establish interchangeability.

High-Chromium Cast Iron Rubber and Polyurethane

View Part Details →

Rear Liner / Rear Cover Liner

Back Liner / Cover Plate Liner

Located on the drive side, it controls rear impeller clearance and protects the area near the shaft seal. Check series, size, shaft bore, internal profile, thickness, sealing interface, fixing method and rear clearance.

Material and manufacturing checks:Confirm high-chromium alloy, elastomer or polyurethane against abrasion, corrosion, shaft-seal type and casing design.

High-Chromium Cast Iron Rubber and Polyurethane

View Part Details →

Adjustable Wear Ring / Lantern Ring

Wear Ring / Lantern Ring

The millMAX adjustable wear ring controls suction-side clearance during operation. The lantern ring belongs to the shaft-seal water circuit. Their functions and designs differ, so identify each by its assembly position.

Material and manufacturing checks:Match wear-ring material to the impeller, throatbush and speed. Match lantern-ring material to seal water, corrosion, shaft sleeve and packing system.

High-Chromium Cast Iron Rubber and Polyurethane Engineering Seal Materials

View Part Details →

Spare Parts

Shafts, Sleeves, Expellers, Seals, Bearing Assemblies and Power Frames

Identify drive and seal components separately, focusing on power-frame and bearing designations, shaft and housing fits, seal arrangement, lubrication and alignment with the wet end.

Pump Shaft and Shaft Sleeve

The pump shaft transmits torque; the sleeve protects the seal area. They are separate components. Check series, power-frame designation, overall length, shaft diameter, bearing seats, threads, keys, impeller connection, sleeve bore and outside diameter, sealing surfaces and rotation.

Material and manufacturing checks:Specify a verified alloy steel for the shaft, with fatigue, accuracy and non-destructive testing requirements. Confirm the sleeve against wear, corrosion, seal compatibility and surface treatment.

alloy steels for drive parts Specialty Alloys

View Part Details →

Expeller and Expeller Ring

The rotating and stationary components of a centrifugal dry shaft seal. Check pump size, power frame, sleeve, inside and outside diameters, vanes, clearances, rotation, casing, material and target pressure differential.

Material and manufacturing checks:Confirm wear alloy, elastomer or corrosion-resistant material against speed, slurry, seal pressure differential and the original seal design.

High-Chromium Cast Iron Specialty Alloys

View Part Details →

Stuffing Box Liner

Located where the shaft passes through the casing, supporting packing, the lantern ring or associated seal components. Check series, power frame, sleeve, internal profile, hole pattern, seal-water connections, gland and assembly orientation.

Material and manufacturing checks:Confirm corrosion-resistant alloy, engineering plastic or the original specified material against seal water, temperature, corrosion, friction and fit tolerances.

Specialty Alloys Engineering Seal Materials

View Part Details →

Packing, Glands and Mechanical Seals

Gland Packing, Gland and Mechanical Seal

FLS lists water-flushed, centrifugal and mechanical drive-side seal options. Check series, sleeve, stuffing box, seal-water pressure and flow, speed, temperature, slurry and flushing arrangement.

Material and manufacturing checks:Confirm seal materials against the fluid, temperature, pressure, shaft speed, abrasive-particle ingress risk and original seal designation.

Engineering Seal Materials

View Part Details →

Bearing Assembly, Bearing Housing and Power Frame

Bearing Assembly, Housing and Power Frame

Supports the shaft and maintains alignment of the impeller, wear ring and seals. Check power-frame designation MMAA–MMG or the relevant series, bearing designation, clearance, shaft and housing fits, lubrication, end covers, seals and external adjustment mechanism.

Material and manufacturing checks:Confirm bearing steel, drive alloy steel, cast-iron housing, grease and seal materials against load, speed, temperature rise, fits and original designations.

alloy steels for drive parts Engineering Seal Materials

View Part Details →

Dedicated Maintenance Systems

OEM Belt Tensioning and Quick Wet-End Replacement Systems

These systems are publicly documented by FLS for KREBS pumps. Confirm the base, motor, pump size, wet-end module, lifting points and site clearance against the actual installation.

KREBS Belt Tensioning System

A hydraulic cylinder raises or lowers the motor base to replace or retension V-belts without realigning the pulleys. Check the pump and motor bases, belt count, pulley centre distance, stroke, load and site clearance.

View FLS OEM Documentation →

KREBS Quick Release System

A quick-release shaft, impeller support, columns, optional lifting assembly and maintenance base allow the assembled wet-end module to be replaced as a unit. Official documentation covers millMAX, slurryMAX-XD and UMD sizes 14×12 (350×300 mm) and larger.

View FLS OEM Documentation →

Wet-End Materials and Failure Modes

Select High-Chromium Alloys, Elastomers, Polyurethane and Tungsten Carbide Reinforcement by Location

Material selection depends on coarse-particle impact, fine-particle erosion, corrosion, pressure, impeller peripheral speed and seal conditions. High-chromium alloy is not the default for every position; elastomers and polyurethane must also meet design, speed and temperature limits.

High-Chromium Wear-Resistant Cast Iron For abrasion-resistant metal impellers, casings, liners and wear rings Rubber and Polyurethane For replaceable liners, impellers and fine-particle or corrosive duties Tungsten Carbide and Hard-Surface Reinforcement Laser cladding and local reinforcement for extreme abrasion alloy steels for drive parts For shafts, bearing seats, connections and fatigue loading Engineering Seal Materials For packing, mechanical seals, lantern rings and seal-water systems

Drawing and spare part numbers

Match OEM or Third-Party Numbers to the Pump Series, Size, Rotation and Material

Supply the full series and size, suffix, serial number, rotation, discharge orientation, impeller diameter and blade count, casing and liner materials, shaft seal, power frame, drawings and worn-part photographs with the part number.

Submit an FLS / KREBS OEM drawing number Check series, BOM, drawing revision, rotation and material Submit a third-party part number Match pump model, part name, key dimensions and material Submit wear and operating data Check flow, head, speed, particle characteristics, concentration and failure location

Are parts interchangeable between millMAX, slurryMAX and UMD pumps of the same size?

Pump size alone does not establish interchangeability. Check the full series, suffix, casing design, liners, impeller, wear ring, shaft seal, pressure rating, rotation, discharge orientation, power frame and drawings.

How are wet-end materials selected?

Shortlist high-chromium alloys, elastomers, polyurethane or local hard-surface reinforcement by part location and failure mode. Then confirm against the original design, particle size, concentration, corrosion, pressure, speed, drawings and acceptance requirements.

FLS KREBS Slurry Pumps: millMAX, slurryMAX, UMD and Related Series

Pump Series, Sizes, Wet-End Parts, Drive Spares and Maintenance Tools

millMAX, millMAX-e, slurryMAX, UMD and Related Pumps

Impellers, Casings, Liners, Throatbushes and Adjustable Wear Rings

Impeller

Volute / Casing Liner

Throatbush / Suction Bushing

Front Liner / Front Cover Liner

Rear Liner / Rear Cover Liner

Adjustable Wear Ring / Lantern Ring

Shafts, Sleeves, Expellers, Seals, Bearing Assemblies and Power Frames

Pump Shaft and Shaft Sleeve

Expeller and Expeller Ring

Stuffing Box Liner

Packing, Glands and Mechanical Seals

Bearing Assembly, Bearing Housing and Power Frame

OEM Belt Tensioning and Quick Wet-End Replacement Systems

KREBS Belt Tensioning System

KREBS Quick Release System

Select High-Chromium Alloys, Elastomers, Polyurethane and Tungsten Carbide Reinforcement by Location

Match OEM or Third-Party Numbers to the Pump Series, Size, Rotation and Material

Are parts interchangeable between millMAX, slurryMAX and UMD pumps of the same size?

How are wet-end materials selected?

Send Your FLS KREBS Pump Model, Drawing Number or Wet-End and Drive Spare Requirements

From Technical Assessment to Finished-Part Delivery

Drawing and Engineering Review

Material and Heat-Treatment Specification

Quality Control

Finished-Part Delivery