PEERLESS TU Series Guida all'installazione

Read this entire book

before attempting to install, operate or repair this

pump. Properly installed, your Peerless pump will give

you satisfactory, dependable service. We urge that

you carefully read these step-by-step instructions to

simplify any problems of installation, operation or

repair.

Failure to read and comply with installation and

operating instructions will void the responsibility

New Equipment manufactured by Seller or Service supplied by Seller

is warranted to be free from defects in material and workmanship

under normal use and service for a period of one year from date of

shipment. In the case of spare or replacement parts manufactured

by Seller, the warranty period shall be for a period of twelve months

from shipment. Seller's obligation under this warranty is limited to

repairing or replacing, at its option, any part found to its satisfaction

to be so defective, provided that such part is, upon request, returned

to Seller's factory from which it was shipped, transportation prepaid.

Parts replaced under warranty shall be warranted only from date of

repair. This warranty does not cover parts damaged by

decomposition from chemical action or wear caused by abrasive

materials, nor does it cover damage resulting from misuse, accident,

neglect or from improper operation, maintenance, installation,

modification or adjustment. This warranty does not cover parts

repaired outside Seller's factory without prior written approval. Seller

makes no warranty as to starting equipment, electrical apparatus or

other material not of its manufacture. If Purchaser or others repair,

replace, or adjust Equipment or parts without Seller's prior written

approval, Seller is relieved of any further obligation to Purchaser

under this section with respect to such Equipment or parts, unless

such repair, replacement, or adjustment was made after Seller failed

to satisfy within a reasonable time Seller's obligations under this

Paragraph.

WARNING

Shut down pump. Disconnect power to the pump driver

before starting any repairs. Refer to Bulletin No.

2880549 for the procedure to follow.

1-1. Disengage the coupling halves. If pin and rubber

bushing type, remove the ins; if other type, refer to the

coupling manufacturer’s instructions. Disconnect

plumbing from water-cooled bearings.

1-2. PUMP. (See figure 1 or 2). Disassemble pump (to

the extent required) as follows:

NOTE

Disassembly and reassembly instructions for both type

pumps are included in this bulletin. Disregard the

instructions which do not apply to the specific pump

being repaired.

a. Remove the nuts from the gland bolts (17B) and

remove glands (17) from the shaft (6). The gland

halves are separable.

of the manufacturer and may also result in bodily injury

as well as property damage.

REPAIR INSTRUCTIONS

TYPE TU, TUF-2 STAGE AND TUT, TUTF-3 STAGE

CENTRIFUGAL PUMPS

This book is intended to be a permanent part of your

installation and should be preserved in a convenient

location for ready reference. If these instructions

should become soiled, obtain a new copy from

Peerless Pump Company. Include pump model and/or

serial number with your request.

WARRANTY

Seller's liability for breach of these warranties (or for breach of

any other warranties found by a court of competent jurisdiction

to have been given by Seller) shall be limited to:

(a) accepting return of such Equipment FCA Plant of

Manufacture (CPT under Incoterms 2000), and

(b) refunding any amount paid thereon by Purchaser

(less depreciation at the rate of 15% per year if

Purchaser has used Equipment for more than thirty

[30] days), and canceling any balance still owing on

the Equipment.

the Service, or refunding the purchase order amount

of the Service or portion thereof upon which such

liability is based.

These warranties are expressly in lieu of any other warranties,

express or implied, and Seller specifically disclaims any implied

warranty of merchantability or fitness for a particular purpose,

and in lieu of any other obligation or liability on the part of the

Seller whether a claim is based upon negligence, breach of

warranty, or any other theory or cause of action. In no event

shall Seller be liable for any consequential, incidental, indirect,

special or punitive damages of any kind.

SECTION I - DISASSEMBLY

WARNING

Do not operate this pump at any pressure, flow rate, or

liquid temperature other than those for which the pump

was originally purchased. Do not pump any other liquid

than the one for which the pump was originally

purchased without the consent of Peerless Pump or its

authorized representatives. Disregard of this warning

can result in pump failure and serious personal injury

or death.

b. Remove all nuts or cap screws from the upper

casing (1B) and from the bearing caps (41). Match

mark and remove both bearing caps.

c. Screw down the jack screws alternately and evenly

to separate the upper and lower casings. Turn the jack

screws back after the case halves have separated to

avoid interference at reassembly.

d. Attach a hoist to the eye bolt(s) (customer-

furnished), or to a sling through external cross-over, to

lift upper casing (1B). Do not use eye bolts to lift

pump. 2883820

Rev.10-04

e. Place slings around the shaft near the bearing

housings and lift rotating element from lower casing

(1A). Tap lightly on the underside of the bearing

housings (31 and 33) to separate the housing from the

brackets.

f. Place rotating element in a convenient work place.

1-3. ROTATING ELEMENT. Remove the plugs and

drain oil from the oil lubricated bearings. Remove

constant level oilers (125) and pipe nipples.) (Not

required for grease lubricated bearings.) Proceed as

follows.

a. Loosen set screw and remove the coupling half. Tap

from the back of the hub or use a puller. Remove

coupling key (46).

b. Loosen set screws on the water deflector (40A).

c. Remove cap screws or stud nuts from bearing covers

(35) and separate covers from housing (31) and (33).

(Use care not to damage the oil seal (107)) used with oil

lubricated bearings.)

d. Lightly tap around housings (31,33) to remove. Do not

cock or force housing off, as to do so may damage the

bearings (16,18), or the oil seal (107).

e. Loosen and remove bearing locknut (22) and

lockwasher (69A).

f. Remove bearings as described in Figure No. 3.

g. Carefully remove shaft collars (68) (if present) and

bearing covers (35). Use care not to damage cover

gasket (73B) or oil seal (107).

NOTE

Clearance between collar and shaft is approximately

0.002 inch. Use care when removing not to cock or

force, as this will score the shaft.

h. Withdraw casing rings (7, 7A). On most pumps these

may be withdrawn before removing the coupling half.

i. Remove water deflector (40), packing (13), lantern

rings (29) and stuffing box bushings (63). Make note of

the number of packing rings on each side of the lantern

rings.

j. Loosen the shaft sleeve (14) set screws near impeller

hub. With a spanner wrench, turn the inboard sleeve in

the same direction as shaft rotation to remove (shaft has

right-and left-hand threads on opposite sides of

impeller). NOTE

A seal between the shaft and sleeves is made with a

2-1. INSPECTION. Visually inspect parts for damage affecting

serviceability or sealing. Emphasize inspection of mating parts

having relative motion – wear rings, for example. Perform

detail inspection as follows:

a. Check O-rings and bearing cover gaskets for cracks, nicks

or tears; packing rings for excessive compression, fraying or

shredding, embedded particles (dirt or metal). Replace if

defective in any way.

b. Mount the shaft between lathe centers. Check the

eccentricity throughout entire length with a dial indicator to be

not more than 0.003 inch total indicator reading. Check that the

threads are clean and sharp. Surfaces on which bearings

mount must be smooth, have a finish not

less than 32 micro-inches, and have shoulders square

and free from nicks.

c. Measure the OD of the integral impeller wear surfaces

rubber O-ring in a groove in the sleeve. Use care not to

damage the O-ring.

k. Support the back side of first stage impeller (2) with a

split ring on the base of a suitable arbor press. Shift the

inter-stage bushing (113) toward second (third) stage

impeller (2) so that support ring bears on impeller close

to shaft (6). Carefully press shaft through impeller (2).

l. Take off inter-stage bushing (113) and remove impeller

key (32).

m. Similarly support second stage impeller (2) with split

ring, press shaft through impeller and remove key (32).

Remove casing ring (7).

n. Support third stage impeller (2) in same manner,

press shaft through inter-stage sleeve (58A) and

impeller, then remove key (32).

o. Press shaft through inter-stage sleeve (58).

1-4. CLEANING. Clean all metal parts (except bearings)

with a solvent. Use a bristle brush (NOT metal or wire) to

remove tightly adhering deposits. A fiber scraper may be

used to remove the gasket and shellac from casing

flanges.

a. Blow dry with clean dry compressed air.

b. Clean bearings as described in 1-5.

1-5. CLEANING BEARINGS.

a. Remove bearings from the housings, referring to

disassembly instructions.

b. Place bearings in a wire basket to there is space for

the cleaning solvent to reach all parts.

c. Immerse the basket in Stoddard solvent or equivalent,

agitating the basket until grease is thoroughly loosened

and can be flushed out.

d. Place bearing on a screened surface.

e. Using a spray gun with air filter and clean Stoddard

solvent, flush each bearing until all grease and sludge is

removed.

f. Blow solvent out of bearings with dry filtered air.

g. Lubricate bearings immediately after cleaning with

light spindle oil and place them in a covered container.

h. Do not spin bearings any time during cleaning.

SECTION II

INSPECTION AND REPAIR

and the ID of the casing rings (7 and 7A). Compute the

diametrical clearance (ID minus OD) and compare with the

limits given in Figure 5. ID surface of casing ring must be

smooth and concentric. For pumps equipped with impeller

rings, clearances should not exceed two times the maximum

amount shown for pump type in Figure No. 5.

d. Measure OD of inter stage sleeve (58) and ID of inter-stage

bushing (113). Compute diametrical clearance and compare

with limits given in Figure 6. ID surface of inter-stage bushing

must be smooth and concentric. Sleeve lands must be free

from burrs and flat spots.

e. Examine impeller passages for cracks, dents, gouges or

embedded material.

f. Check upper and lower casing machined surfaces to be free

from burrs or nicks.

2883820

g. Inspect shaft sleeves (14) for excessive wear.

h. Inspect bearings per Table I.

2-2. REPAIR. Make needed repairs in the following

manner:

a. If ID of casing ring (7, 7A) is grooved, scored or

eccentric, bore to produce a smooth, concentric surface.

Do not bore casing ring more than 1/8 inch larger than

original ID. If larger bore is required to produce a smooth

surface, replacement of casing ring and impeller ring is

recommended. Measure and record the new ID.

b. If impeller rings are defective, or mating casing rings

require boring, remove the old rings by turning in a lathe

– be sure machining is concentric with impeller ID. Use

care NOT to reduce hub OD.

NOTE

For bronze impellers and rings, the ring is shrunk on the

hub according to standard fit FN-4 of ANSI B4.1

standards.

For pumps of 10-inch discharge and larger, the rings are

also tack welded to the hub at 3 places 120 degrees apart.

Hardened impeller rings are installed according to ANSI

B4.1 standard fit FN-1.

c. Install new ring son the impeller (shrink or press

depending on material) and tack weld if old rings were

tacked. The ID is factory-machined for proper fit.

d. Turn the OD of the new rings to provide the proper

diametrical clearance and to be smooth and concentric

with hub bore. Use clearance limit from Figure 5, and ID of

casing ring from paragraph 2-2 a. to compute OD of

impeller rings.

e. Replace worn shaft sleeves.

f. Straighten or replace shafts having excessive run-out

(eccentricity).

Figure 1 TYPE TU TUF-2 STAGE PUMPS WITH INTERNAL OR EXTERNAL CROSS-OVER GREASE LUBRICATED

BEARINGS

Parts List

Item No. Description Item No. Description

1A Lower Casing 32 Impeller Key

1B Upper Casing 33 Outboard Bearing Housing

2 Right Hand Impeller 35 Bearing Cover

2A Left Hand Impeller 40 Water Deflector

6 Shaft 41 Bearing Cap

7 Right Hand Casing Ring 46 Coupling Key

7A Left Hand Casing Ring 58 Inter-stage Sleeve

13 Packing 63 Stuffing Box Bushing

14 Shaft Sleeve 68 Shaft Collar

16 Outboard Bearing 69A Bearing Lock washer

17 Packing Gland 73A Casing Gasket (Not Shown)

17B Gland Bolt 73B Bearing Cover Gasket

18 Outboard Bearing 113 Inter-stage Bushing

22 Bearing Locknut 127 Seal Piping

29 Lantern Ring 128 Inter-stage Sleeve Key

31 Inboard Bearing Housing 130 Shaft Sleeve “O”-Ring

2883820

4851914

Rev. 3-88

Figure 1A TYPE TU 2 STAGE PUMPS WITH INTERNAL OR EXTERNAL CROSS-OVER OIL LUBRICATED BEARINGS

Parts List

Item

No. Description Item

No. Description

1A Lower Casing 33 Outboard Bearing Housing

1B Upper Casing 35 Bearing Cover

2 Right Hand Impeller 40 Water Deflector

2A Left Hand Impeller 41 Bearing Cap

6 Shaft 46 Coupling Key

7 Right Hand Casing Ring 58 Inter-stage Sleeve

7A Left Hand Casing Ring 63 Stuffing Box Bushing

13 Packing 68 Shaft Collar

14 Shaft Sleeve 69A Bearing Lock-washer

16 Outboard Bearing 73A Casing Gasket (Not Shown)

17 Packing Gland 73B Bearing Cover Gasket

17B Gland Bolt 107A Oil Retaining Shield

18 Outboard Bearing 113 Inter-stage Bushing

22 Bearing Locknut 125 Constant Level Oiler (Not Shown)

29 Lantern Ring 127 Seal Piping

31 Inboard Bearing Housing 128 Inter-stage Sleeve Key

32 Impeller Key 130 Shaft Sleeve “O”-Ring

Coolant flow per bearing is 1 US GPM @ 50 Psig maximum, coolant temperature 90º F. . maximum. Normal

coolant medium is water

2883820

FIGURE 2 – TUT, TUTF 3 STAGE

GREASE LUBRICATED BEARINGS

2874541

Rev. 3-88

Parts List

Item

No. Description Item

No. Description

1A Lower Casing 35 Bearing Cover

1B Upper Casing 40 Water Deflector

2 Right Hand Impeller 41 Bearing Cap

2A Left Hand Impeller 46 Coupling Key

6 Shaft 58 Inter-stage Sleeve

7 Right Hand Casing Ring 58A Inter-stage Sleeve A

7A Left Hand Casing Ring 63 Stuffing Box Bushing

13 Packing 68 Shaft Collar

14 Shaft Sleeve 69A Bearing Lock washer

16 Outboard Bearing 73A Casing Gasket (Not Shown)

17 Packing Gland 73B Bearing Cover Gasket

17B Gland Bolt 113 Inter-stage Bushing

18 Outboard Bearing 127 Seal Piping

22 Bearing Locknut 128 Inter-stage Sleeve Key

29 Lantern Ring 130 Shaft Sleeve “O”-Ring

31 Inboard Bearing Housing

32 Impeller Key

33 Outboard Bearing Housing

2883820

FIGURE 2A – TUT 3 STAGE

OIL LUBRICATED BEARINGS

4858505

Rev. 3-88

Parts List

Item No. Description Item No. Description

1A Lower Casing 35 Bearing Cover

1B Upper Casing 40 Water Deflector

2 Right Hand Impeller 41 Bearing Cap

2A Left Hand Impeller 46 Coupling Key

6 Shaft 58 Inter-stage Sleeve

7 Right Hand Casing Ring 58A Inter-stage Sleeve A

7A Left Hand Casing Ring 63 Stuffing Box Bushing

13 Packing 68 Shaft Collar

14 Shaft Sleeve 69A Bearing Lock washer

16 Outboard Bearing 73A Casing Gasket (Not Shown)

17 Packing Gland 73B Bearing Cover Gasket

17B Gland Bolt 107A Oil Retaining Shield

18 Outboard Bearing 113 Inter-stage Bushing

22 Bearing Locknut 125 Constant Level Oiler (Not Shown)

29 Lantern Ring 127 Seal Piping

31 Inboard Bearing Housing 128 Inter-stage Sleeve Key

32 Impeller Key 130 Shaft Sleeve “O”-Ring

33 Outboard Bearing Housing

Coolant flow per bearing is 1 US GPM @ 50 Psig maximum, coolant temperature 90º F. . maximum. Normal

coolant medium is water

2883820

BEARING MOUNTING

FIGURE 2, BEARING REMOVAL AND MOUNTING

BEARING REMOVAL

-COURTESY OF NEW DEPARTURE-

USING AN ARBOR PRESS

1. PLACE THE BEARING ON

TWO FLAT BLOCKS SO

THAT THEY CONTACT THE

INNER RING OR BOTH

RINGS OF THE BEARING.

2. HOLD SHAFT STRAIGHT –

FORCE THE SHAFT BY A

STEADY PRESSURE, UNTIL

THE BEARING IS SEATED

AGAINST THE SHAFT

SHOULDER.

USING TUBING

1. PLACE THE BEARING ON

SHAFT.

2. PLACE TUBING OVER SHAFT

IN CONTACT WITH THE

INNER RING OF THE

BEARING.

3. APPLY HAMMER ALTERNATELY

AT OPPOSITE POINTS –

AVOID COCKING.

USING A BEARING PULLER

1. PLACE BEARING PULLER

BEHIND BEARING INNER

RING. SET PULLER JAWS

SO THAT THEY WILL NOT

SLIP OVER THE INNER RING

AND DAMAGE SPARATOR

OR SHIELD WHEN PRESSURE

IS APPLIED.

2. FORCE BEARING OFF SHAFT

BY A STRAIGHT PULL.

DO NOT COCK BEARINGS.

USING AN ARBOR PRESS

1. REST THE BEARING INNER

RING OR BOTH RINGS

(NEVER THE OUTER RING

ONLY) AGAINST A PAIR OF

FLAT BLOCKS.

2. FORCE THE SHAFT OUT BY

A STEADY PRESSURE – KEEP

SHAFT STRAIGHT – DO NOT

ALLOW SHAFT TO COCK OR

DROP.

2883820

IMPELLER/CASE WEAR RING DIAMETERICAL CLEARANCES (INCHES)

0.010

0.014

1½ TU7, 15TU7A2, 15TUT7A3, 2TU8, 2TU8A2, 2TU10,

2TU10A2, 2TU10G2, 2TU12, 2TU12A2, 3TU10, 3TU10A2,

3TU13, 3TU13A2, 3TU13G2, ,3TU13 ½, 3TU135A2, 3TU135G2,

3TUT13, 3TUT13A3, 3TUT13G3,

0.012

0.016

4TU10, 4TU10A2, 4TU11A2, 4TUF11, 4TU14,4TUF5, 4TU14A2,

4TU14G2, 4TUT14A3, 4TUT14G3, 4TUTF14, 5TU13, 5TU13B,

5TU13B2, 5TUF13B, 5TU15, 5TU15A2, 5TUF7, 5TUT16,

5TUT16B, 5TUT16C3, 5TUT16G3, 5TUT16N3, 5TUTF16B

0.014

0.018 6TU16, 6TU16B, 6TU16C2, 6TU16G2, 6TUF10

0.018

0.022 8TU16, 8TU16A2, 8TU16F, 8TU16G2, 8TU17, 8TUF15,

10TU22B

0.022

0.026 10TU22C, 10TU22C2

FIGURE 5

INTERSTAGE SLEEVE/BUSHING DIAMETRICAL CLEARANCES (INCHES)

0.008

0.012

1½ TU7, 15TU7A2, 2TU8, 2TU8A2, 2TU10, 2TU10A2, 2TU10G2, 2TU12, 2TU12A2, 3TU10,

3TU10A2, 3TU13, 3TU13A2, 3TU13G2, ,3TU13 ½, 3TU135A2, 3TU135G2, 4TU10, 4TU10A2,

4TU11A2, 4TU14, 4TU14A2, 4TU14G2, 4TUF5, 5TU13, 5TU13B, 5TU13B2, 5TUF13B,

5TU15, 5TU15A2, 5TUF7, 6TU16, 6TU16B, 6TU16C2, 6TU16G2, 6TUF10, 1 ½TUT7-3,

15TUT7A3, 3TUT13, 3TUT13A3, 3TUT13G3, 4TUT14, 4TUT14A3, 4TUT14G3,4TUTF14,

5TUT16, 5TUT16B, 5TUT16C3, 5TUT16G3, 5TUT16N3, 5TUTF16B

0.010

0.014

8TU16, 8TU16A2, 8TU16F, 8TU16G2, 8TU17, 8TUF15, 10TU22B

0.020

0.024 10TU22C, 10TU22C2

FIGURE 6

NOTE

Clearances are for standard bronze or cast iron fitted pumps. For materials with a tendency to gall, such as

stainless steel, increase clearance approximately .010 inch.

2883820

SECTION III – REASSEMBLY

Figure 7. Vane Position for Proper Rotation

3-1. ROTATING ELEMENT. (See Figure 7 or 8).

Reassemble as follows:

a. Coat shaft (6) lightly with oil. Re-oil as necessary while

pressing on impellers and sleeves.

b. Install 3/16 square key in shaft. With grooves, square

shoulder side, facing toward the highest number stage,

press interstage sleeve (58) on outboard end of shaft,

locating centrally between first two key slots. Slide

interstage bushing (113) over sleeve.

Figure 8. Assembly Relationship of Interstage Sleeve (58)

c. Insert key (32), align third (or second) stage impeller

(2B) and press on inboard end of shaft to contact inter-

stage sleeve.

d. Press on interstage sleeve (58A) to contact third stage

impeller. Located casing ring (7) on third stage impeller

ring (8).

e. In turn, insert remaining keys (32), align second

and/or first stage impellers (2A, 2) and press on shaft.

Carefully bump parts to remove all clearance and so that

first and second stage impeller hubs extend equally

beyond central portion of shaft (slightly into threaded

portions).

f. Install O-rings in shaft sleeves (14), coat ring and

shaft with oil and screw sleeves on shaft against

impeller hubs.

g. Install the stuffing box bushing (63) and lantern ring

(29) on the shaft.

h. Locate casing rings (7) on impeller.

i. Place water deflectors (40) on shaft.

j. Slide bearing covers (35) (with oil seals (107)

installed for oil lubricated bearings) on the shaft.

k. Place shaft collars (68) on the shaft.

l. Mount the bearings (16) and (18) as described in Figure

3. The outboard bearings are two single row angular

contact bearings mounted in the duplex DB mounting.

m. Install bearing lockwasher (69A) and locknut (22) (oil

thrower) and tighten against the outboard bearing.

n. Install gaskets (73B) on bearing covers. Cut replace-ment

gaskets from 1/16 inch No. 444 Vellumoid. Apply cement

(i.e. Permatex No. 2) to bearing cover gaskets when

bearings are water-cooled.

o. Slide the housings (31, 33) over the bearings. Tap lightly

and evenly around the end as necessary. Do not force.

p. Attack the bearing covers (35). In the assembled position,

the grease fittings or breather tubes must be located on top.

q. Locate water deflector (40) and tighten the setscrews.

Install oil seal (107) in the inboard bearing housing (31) (for

oil lubricated bearings).

r. Install coupling key; assemble coupling half on the shaft

and tighten the setscrew.

s. Check run out of the interstage sleeves on assembled

rotor. Maximum run out must not exceed .006 TIR.

3-2. PUMP. Complete the assembly of pump as follows:

a. Use the upper casing (1B) as a template to cut a gasket

(73A) from 1/64 inch Vellumoid. Machined surfaces of both

casings must be perfectly clean and free from burrs and

nicks.

b. Affix the new gasket to lower casing (1A) with shellac.

c. Use slings around the shaft near bearings to set rotating

element into lower casing. Position the casing rings (7, 7A),

and both bearing housings so that all dowel pins engage. If

necessary, loosen setscrews of water and grease deflectors

to shift bearing housings slightly. Retighten screws.

d. Assemble both bearing caps (41) and tighten the cap

screws.

e. If impellers are not (approximately) centered in volute or

impellers are not allowing case rings to seat in casing, adjust

shaft sleeves by loosening one and tightening the other in

direction required. Tighten setscrews in sleeve after final

adjustment is made. Recheck run out of inter-stage sleeves.

If run out exceeds. 006 TIR, do not proceed until

problem is corrected.

f. Cover the topside of the casing gasket with a mixture of

graphite and oil. Install the gland bolts (17B). Carefully

locate the upper casing on the lower, making certain the

dowel pins engage. Attach case nuts and alternately tighten

at diagonally opposite positions. See Torque Chart, Table II.

Rotate shaft by hand to check that it runs free.

g. Withdraw the lantern rings (29) and push the bushings

(63) to the rear of the stuffing boxes. Insert the same

number of packing rings as were found during disassembly

on each side of the lantern ring. Insert each ring separately

and stagger the joints of successive rings 90 degrees. Insert

the glands (17) and set the nuts tight – DO NOT USE A

WRENCH.

h. Rotate shaft by hand to check that it runs free.

i. Replace all drain plugs removed during disassembly.

3-3.Reinstall plumbing (if used) for water-cooled bearing.

a. Relubricate the bearings. Refer to Bulletin No. 2880549

for grease type recommendation. It is most important to

provide proper lubrication and keep bearings clean. Fre-

quency of lubrication must be determined by experience as it

depends upon bearing size, speed, operating conditions and

location (environment). Table III should be used as

2883820

TABLE I

BEARING DEFECTS

(Failures – Replace if found)

DEFECT (Failure)

Flaking and cracking APPEARANCE

In the early stages, the surface of the

inner

and outer races develop small cracks,

which

flake. The cracks and flaking ultimately

spread over the entire race surface.

PROBABLE CAUSE

1. Normal fatigue failure.

Bearing loads in excess of bearing capacity caused by misalignment.

Indentations Indentations or cavities in the inner and

outer races. 1. Dirt in the bearings.

2 Excessive impact loading of the bearings such as improper

mounting or removal.

Broken separator (cage) Cracked separator or separator in pieces. Poor Lubrication.

1. Misalignment of shaft.

2. Excessive shaft deflection.

Wear Bore and OD of outer ring of bearing

galled or braided. 1. Fit on shaft or in housing too loose.

2 . Bearing locked by dirt and turning on shaft or in housing.

Fractured ring Hairline cracks or complete ring fracture. 1. Forcing a cocked bearing on or off a shaft.

2. Too heavy a press fit.

Discoloration Rolling elements and races darker than

Normal appearance of bearing metal.

(Moderate discoloration of rolling elements

and races not a reason for discard.)

1. Inadequate lubrication.

Corrosion Rolling elements and raceways rusted. 1. Water entering the housing.

2. Condensation inside the housing.

Lubricant breaks down into acid. (Wrong lubricant.

TABLE II

TORQUE

VALUECHART

TORQUE VALUE (FT-

LB)

TORQUE VALUE CHART

TORQUE VALUE (FT-LB)

SIZE INCH MEDIUM CARBON STEEL, SAE 5,

105-120,000 PSI, MAT’L CODE

509

3/4 210-225

7/8 305-325

1 450-475

1-1/8 605-635

1-1/4 850-890

1-1/2 1465-1525

Torque values shown are for clean and

lubricated threads: gasketed joints.

Studs must be driven tight in lower casing

when used. Install upper case, tighten center

nut (or cap screws) then work out from center

to each side, tightening with torque wrench to

values shown in Table II.

2883820

TABLE III

GREASING FREQUENCY

(See Table IV for amounts)

SERVICE

Normal, 8-hour day operation,

Room free of dust and damaging

atmosphere.

GREASE EACH

6 Months

Severe, 24-hour day operation.

room with moderate dust and/or

damaging atmosphere,

or outdoor service.

1 Month

Light, approximately 10-hour

eek. Room relatively free of dust

and damaging atmosphere.

1 Year

TABLE IV

AMOUNT OF GREASE FOR BALL BEARINGS

OUNCES GRAMS MODEL

1.3

1.4

2.0

3.0

4.5

5.8

9.5

17.0

36.4

39.2

126

162.4

266

476

1½TU7, 1½TUT7-3, 15TU7A2,

15TUT7A3

2TU8, 2TU8A2, 2TU10, 2TU10A2,

2TU10G2, 2TU12, 2TU12A2, 3TU10,

3TU10A2

3TU13, 3TU13A2, 3TU13G2,

3TU13½, 3TU135A2, 3TU135G2,

4TU14,4TUF5, 4TU14A2, 4TU14G2,

4TUF14, 4TU11A2, 4TUF11,

3TUT13, 3TUT13A3, 3TUT13G3

5TU15, 5TU15A2, 5TUF7

5TU13, 5TU13B, 5TU13B2,

5TUF13B, 6TU16, 6TU16B,6TUF10,

6TU16C2, 6TU16G2, 5TUT16,

5TUT16B, 5TUT16C3, 5TUT16G3,

5TUT16N3, 5TUTF16

8TU16, 8TU16A2, 8TU16F,

8TU16G2, 8TU17, 8TUF15

10TU22B, 10TU22C, 10TU22C

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