Installation Manual

ManualsBrandsBando USA ManualsAutomotiveBando 2365 Precision Engineered V-Belt

Belt Size 012 019 025 031 037 050 075 100 150 200 300 400 500 600

Belt Width

/8"

/16"

/4"

/16"

/8"

/2"

/4" 1" 1

/2" 2" 3" 4" 5" 6"

MXL

Max. .10 .15 .24 .35 .42 .62

Min. .05 .09 .13 .19 .22 .33

Max. .42 .55 .66 1.1 1.9

Min. .20 .31 .37 .57 1.0

Max. 1.3 2.1 2.9 4.7 6.4

Min. 1.0 1.5 2.2 3.4 4.7

Max. 4.7 6.8 10.4 14.3 22.4

Min. 3.7 5.2 8.2 11.2 17.6

Max. 17.7 27.9 39.7 51.0 62.2

Min. 16.3 25.8 36.7 47.0 57.3

XXH Max. 40.5 63.9 90.7 117.2 142.1

Min. 21.5 34.0 48.1 62.3 75.2

4 5

Tensioning

Timing belts should fit the pulleys snugly — neither too

tight nor too loose. The “tooth grip” principle eliminates

the need for high initial tension. A snug belt-pulley fit

extends belt and bearing life, and gives quieter opera-

tion.

Measure span length (“L” in Figure 2 below) and apply a

force perpendicular to the belt. Measure the force

required to deflect the belt 1/64" per inch of span length.

Compare the force required with the table below and

tighten or loosen the belt as required, to bring it into the

recommended range.

For example, an H pitch belt, 1" wide with a span of 30",

should take a force of 5.2-6.8 lbs. to deflect the belt

30/64", or about 1/2".

Taper-Lock

Pulleys

To install:

1. Place bushing in the pulley.

2. Apply oil to both the thread and the point of

setscrews. Place screws loosely in pull-up holes.

3. Make sure the bushing is free in the pulley. Slip the

assembly onto the shaft and position it for proper

belt alignment.

4. Tighten the screws alternately and progressively

until they are tight. To increase leverage, use a

wrench or length of pipe.

5. Tap the large end of the bushing (use hammer and

block or sleeve to prevent damage). Tighten the

screws to the torque values shown in the following

table. Fill the other holes with grease to keep dirt

out.

Torque Values for Tightening TL

Bushings

Bushing Wrench Torque (In. Lbs.)

TL1008 . . . . . . . . . . . . . . . . .55

TL1210 . . . . . . . . . . . . . . . .175

TL1215 . . . . . . . . . . . . . . . .175

TL1610 . . . . . . . . . . . . . . . .175

TL1615 . . . . . . . . . . . . . . . .175

TL2012 . . . . . . . . . . . . . . . .280

TL2517 . . . . . . . . . . . . . . . .430

TL3020 . . . . . . . . . . . . . . . .800

TL3535 . . . . . . . . . . . . . . .1000

TL4040 . . . . . . . . . . . . . . .1700

To remove:

1. Remove both setscrews.

2. Apply oil to both the thread and point of one

setscrew. Insert this screw in the tapped removal

hole, and tighten the inserted screw until the bush-

ing is loose in the sheave. (Note that one setscrew

is not used for removal.)

Rib Ace

Drives

Installation

Clean rust and dirt from Rib Ace

sheaves; replace worn

or damaged sheaves. Sheave alignment is very impor-

tant, and should be checked with a straightedge as

shown on page 2.

Never force or pry a Rib Ace

belt over the sheaves.

Reduce the center distance and lay the belts over the

sheaves.

Tensioning

Measure span length (“L” in illustration below) and apply

a force perpendicular to the belt. Measure the force

required to deflect the belt 1/64" per inch of span.

Multiply the number of ribs by the force “F” per rib in the

chart below, compare this to the force required, and

loosen or tighten the belt as needed.

Run the drive briefly to seat the belt, and recheck the

tension. At least one sheave should be freely rotating

during the tensioning procedure.

Quarter Turn Drives

Quarter turn V-belt drives are used to transmit power

from a horizontal shaft to a vertical shaft, or vice versa.

For maximum service on these drives, follow these

guidelines:

1. Deep groove sheaves should always be used. Use

individual — not banded — belts.

2. Center distance should be equal to 5 1/2 times the

sum of the diameter of the large sheave plus its

face width. This long center distance is necessary

to insure the entry angle of the belts into the

sheave grooves is 5° or less.

3. Speed ratio should not exceed 2.5:1. Greater

speed ratios require such long center distances

that a two-stage drive may be more feasible.

4. The center line of the horizontal shaft on the quar-

ter turn drives should be above the center of the

vertical shaft sheave.

V-Flat Drives

Usually a converted flat belt drive, a V-flat drive has one

V-grooved sheave and one flat pulley. For best results,

follow these recommendations:

1. The arc of contact, or belt wrap, determines if a V-

flat drive is practical. Use the formula A= , where

D is the large sheave diameter, d is the small

sheave diameter, and C is the center distance. If A

is between 0.5 and 1.5, the V-flat drive will have

sufficient wrap to transmit the load under the prop-

er tension.

2. The flat pulley should have a straight face for best

operation. If the pulley is crowned, it should not

exceed 1/4" per foot (on the diameter) of face

width. When possible, remove the crown by

machining.

3. Shock loads and/or pulsating loads should be

avoided on V-flat drives.

4. Bando Combo (banded) belts are ideally suited for

V-flat drives. Power King

belts may also be used.

Consult Bando if Power Ace

belts are considered

for use on V-flat drives.

Idlers

V-Belt Idlers

An idler is a grooved sheave or a flat pulley that does not

transmit power. Idlers create additional bending stress-

es within a belt, and thus reduce horsepower ratings.

Take this into account during drive design so belt life

isn’t reduced.

Idlers are generally used under these circumstances:

• To tension and provide for take-up on a fixed center

drive

• To dampen vibration in a long belt span

• To increase the arc of contact on a small sheave so

the belt won’t slip

• To guide belts around obstructions and to turn corners

• To function as clutching sheaves

Inside Idler

A grooved idler on the inside of the belts, on the slack

side of the drive, is usually preferable to a back side

idler. Place the idler close to the large sheave so the arc

of contact is not greatly reduced on the small sheave.

The diameter of the idler should be as large as, or larg-

er than, the smallest loaded sheave.

Timing Belt Idlers

On timing belt drives, idlers are sometimes used for ten-

sioning, power take-off, or functional purposes. For max-

imum belt life, follow these guidelines:

• As with V-belts, install idler on slack side of drive.

• Inside idlers must be grooved. Back side (outside)

idlers should be flat, uncrowned pulleys.

• Fixed idlers, rather than spring-loaded idlers, are rec-

ommended.

Back Side Idler

A back side (or outside) idler, which is always flat

because it contacts the top of the belts, increases the

arc of contact on both sheaves, but it forces a backward

bend in the belts. Such a bend will shorten life.

The diameter of a back side idler should be at least 1

1/2 times the diameter of the smallest loaded sheave.

Locate the idler as close to the small sheave as possi-

ble, on the slack side of the drive.

Belt Cross

Section

Small Sheave

Diameter Range

Force “F” Lbs./Rib

J 1.32 - 1.67 0.4

J 1.77 - 2.20 0.5

J 2.36 - 2.95 0.6

L 2.95 - 3.74 1.7

L 3.94 - 4.92 2.1

L 5.20 - 6.69 2.5

M 7.09 - 8.82 6.4

M 9.29 - 11.81 7.7

M 12.40 - 15.75 8.8

Rib Ace Tensioning

Timing Belt Tensioning

Units are lbs.

Back Side Idler

Inside Idler

D-d

For tensioning values on HT, XP or STS drives con-

sult Bando with drive parameters or request Bando

Publication BU-200.

Figure 2