Installation Manual

ManualsBrandsBando USA ManualsAutomotiveBando 2365 Precision Engineered V-Belt

Problem Cause Solution Problem Cause Solution

V Belts

Rapid failure with no

visible reason

Replace sheavesWorn sheave grooves

(Check with groove

gauge)

Replace all belts with

a new set, properly

installed

Tensile cords damaged

through improper instal-

lation

Redesign driveUnderdesigned drive

Replace all belts with

correct type, properly

installed

Wrong type or cross

section belt

Dry, hard sidewalls.

Low adhesion between

plies. Cracked belt bottom

Remove heat source.

Improve ventilation

High temperature

Deterioration of rubber Don’t use belt dress-

ing. Clean belts and

sheaves with degreas-

ing agent or detergent

and water. Tension

belts properly

Belt dressing

Replace sheavesWorn or damaged

sheaves

Broken belts Shield driveForeign object in drive

Spin burns Retension driveBelts slip under starting

or stalling load

Redesign driveSheave diameter too

small

Redesign driveLoad miscalculated –

drive underdesigned

Cracked bottom Redesign driveSheave diameter too

small

Replace with an inside

idler on slack side, or

redesign

Back side idler too small

Retension driveSlippage

Remove heat source.

Improve ventilation

High temperature

Extreme cover wear,

worn corners

Remove obstruction

or realign drive

Belt rubs against guard

or other obstruction

Retension driveImproper tension

Clean belt, shield driveDirt on belt

Repair or replace

sheaves

Sheaves rusted, sharp

corners or burrs on

sheaves

Align sheavesSheaves misaligned

Short Belt Life

Use Bando Combo

belts

Shock loads

Position idler on slack

side of drive, as close

as possible to driveR

sheave

Incorrectly placed flat

idler pulley

Install idlerDistance between

shafts too long

Replace with Bando

belts

Belt lengths uneven

Retension driveBelts too loose

Belt Vibration

Use Bando Combo

belts

Severe vibration and

shock loads

Shield driveForeign material in

grooves

Realign sheavesMisaligned sheaves

Replace sheavesWorn sheave grooves

(Check with groove

gauge)

Replace all belts with

a new set, properly

installed

Tensile cord broken

from improper installa-

tion

Retension driveBelt undertensioned

Position idler on slack

side of drive, as close

as possible to driveR

sheave

Incorrectly placed flat

idler pulley

Belt Turnover

Troubleshooting Guide

Redesign driveSheave diameter too

small

Shield the driveForeign substance

caught between belts

and sheave

Soft, slick, swollen

sidewalls. Low

adhesion between

plies

Clean belts and

sheaves with degreas-

ing agent or detergent

and water. Remove

source of oil or grease

Oil or grease on belt or

sheave

Cut bottom Check tension and

alignment

Belt ran off sheave

Shield driveForeign object in drive

Replace all belts with

a new set, properly

installed

Improper installation

Belts stretch unequally Realign driveMisaligned drive

Replace all belts with

a new set, properly

installed

Tensile cord broken

from improper installa-

tion

Belts stretch equally Check take-up and fol-

low guidelines

Insufficient take-up

allowance

Redesign driveOverloaded or underde-

signed drive

Belt Stretch

RetensionBelt slip

Realign sheavesMisaligned sheaves

Replace cut edge

with wrapped belt

Wrong belt type

Belt Noise

Retension driveSpin burns

Redesign driveToo few belts

Severe Slippage

Force/deflection method

1. Measure the span length “L” of your drive (see Figure 1).

2.At the center of the span, apply a force perpendicular

to the belt. Measure the force required to deflect the

belt 1/64" per inch of span length. For example, for a

100" span, the deflection would be 100/64", or approx-

imately 1 1/2 inches.

3.Compare the force required to the recommended

ranges in the tables below. Tighten or loosen the belt

to bring it into the recommended range.

4.When you install new belts, tighten them to “initial ten-

sion” forces shown in the tables. This tension will drop

during the run-in period.

Inspect belt drive in 24-48 hours

During the 24-48 run-in period, the initial stretch is taken

out of the belts and the belts seat lower in the sheaves.

Check belt tension to assure it falls between the maxi-

mum and minimum values shown in the tables to the

left.

Belt Storage Tips

Under proper conditions, belts can be stored for many

years without shortening service life. Follow these

guidelines:

• Store belts in a cool, dry, dust-free area, away from

radiators and direct sunlight. Temperatures below 85°

and relative humidity below 70% are recommended.

• Store belts away from ozone producing unguarded flu-

orescent lights, mercury vapor lights, and high voltage

electrical equipment.

• Don’t store belts near chemicals, oils, solvents, lubri-

cants, or acids.

• Belts can be coiled on shelves or hung on pegs. Avoid

sharp bends and stresses that can cause permanent

deformation and cracks. Stack belts no higher than

12" to prevent damage to bottom belts. When hanging,

coil longer belts to prevent distortion from belt weight.

Synchro-Link

Timing Belt Drives

Installation

Inspect timing belt pulleys for dirt, rust, damage, and

wear. Clean pulleys as needed; replace worn or dam-

aged pulleys.

Check that the pulley support structure is rigid. Loose

supports cause center distance variation, shaft mis-

alignment, and pulley-tooth disengagement.

Check drive alignment with a straightedge and make

sure pulleys and shafts are parallel. On a long-center

drive, it’s often advisable to slightly offset the driveN pul-

ley to compensate for the belt’s tendency to run against

one flange of the driveR pulley.

Never force or pry a belt over the pulley flange. Reduce

center distance or idler tension, or remove one or both

pulleys. Lay the belt over the pulleys and adjust the take-

up until the belt teeth mesh securely with the pulley

grooves.

Note: For banded belts, multiply the force in the table by the number of belts in the band.

* 1/2 of this deflection force can be used, but substitute deflection amount as follows:

DA (inches) =

LS (inches)

128

- 3.0 3.6 3.1 2.4

3.1 - 4.0 4.2 3.6 2.8

4.1 - 5.0 5.2 4.6 3.5

5.1 - 6.1 5.3 4.1

- 4.6 7.3 6.4 4.9

4.7 - 5.6 8.7 7.5 5.8

5.7 - 7.0 9.3 8.1 6.2

7.1 - 10.0 8.8 6.8

- 7.0 12.5 10.7 8.2

7.1 - 9.0 15.0 13.0 10.0

9.1 - 12.0 18.0 16.3 12.5

12.1 - 19.5 16.9 13.0

12.0 - 13.0 25.5* 22.1 17.0

13.1 - 15.5 30.0* 26.0* 20.0

15.6 - 22.0 32.0* 28.0* 21.5

18.0 - 22.0 45.0* 39.0* 30.0*

22.1 - 52.5* 45.5* 35.0*

1.5 - 2.0 1.4 1.1 0.8

2.1 - 2.7 1.9 1.4 1.1

2.8 - 4.0 2.5 2.0 1.5

2.0 - 2.5 2.1 1.6 1.2

2.6 - 3.5 2.4 1.8 1.4

3.6 - 5.0 3.1 2.3 1.8

3.0 - 3.5 3.2 2.5 1.9

3.6 - 4.5 4.1 3.2 2.4

4.6 - 6.0 5.1 3.9 3.0

- 3.0 5.1 4.4 3.4

3.1 - 4.0 5.5 4.8 3.7

4.1 - 5.0 6.0 5.2 4.0

5.1 - 6.7 5.9 4.5

- 4.6 10.0 8.7 6.7

4.7 - 5.6 11.0 9.5 7.3

5.7 - 7.0 11.5 9.9 7.6

7.1 - 12.0 10.1 7.8

- 7.0 18.0 15.6 12.0

7.1 - 9.0 19.5 16.9 13.0

9.1 - 12.0 20.0 17.6 13.5

12.1 - 21.0 18.2 14.0

2.65 - 3.35 4.6 4.0 3.1

3.65 - 4.50 5.5 4.8 3.7

4.75 - 6.0 6.4 5.6 4.3

6.5 - 10.6 7.3 6.4 4.9

7.1 - 10.3 16.5 14.3 11.0

10.9 - 11.8 19.5 16.9 13.0

12.5 - 16.0 21.0 18.2 14.0

12.5 - 16.0 39.0* 33.8* 26.0*

17.0 - 20.0 45.0* 39.0* 30.0*

21.2 - 24.4 51.0* 44.2* 34.0*

2.2 - 2.5 4.8 4.2 3.2

2.65 - 4.75 5.7 4.9 3.8

5.0 - 6.5 7.2 6.2 4.8

6.9 - 8.7 7.5 5.8

- 5.5 15.0 13.0 10.0

5.9 - 8.0 19.0 16.9 13.0

8.5 - 10.9 21.0 18.2 14.0

11.8 - 22.0 19.5 15.0

Recommended Deflection Force (Lbs.)

V-Belt

Cross

Section

3VX

5VX

Small Sheave

Diameter Range

(Inches)

Initial

Installation

Retensioning

Maximum Minimum

V-Belt Tensioning

Figure 1

Rapid sidewall wear Replace sheavesWorn or damaged

sheaves