Page 119 - Goodyear2011PTCatalog

P O W E R T R A N S M I S S I O N P R O D U C T S

G E N E R A L I N F O R M A T I O N

117

G E N E R A L I N F O R M A T I O N

2 0 1 1

T

e c h n i c a l

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n f o r m at i on

B

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n s ta l l at i on

& T

e n s i on i n g

OBJECTIVE:

Goodyear Engineered Products Synchronous timing belts

must be installed and tensioned properly to ensure optimum

performance. Sprocket alignment must be preserved while

tensioning the drive.

Before beginning, inspect the belt for damage and verify that

the sprockets are properly mounted. Refer to sprocket and bush-

ing manufacturer installation procedure. Belts should never be

crimped or bent to a diameter less than the minimum sprocket

diameter, approximately 2.5 inches for 8mm belts and 5 inches

for 14mm belts.

1. Shorten the center distance or release the tensioning idler to

install the belt. Do not pry the belt onto the sprocket. Refer

to the following Center Distance Allowance tables for required

center distance adjustment.

Apply the following center distance allowances for the

Hawk Pd

®

and Falcon HTC

®

. A center distance adjust-

ment, or decrease in center distance, is necessary to install

a belt. In addition, an increase in center distance will be

necessary for proper tensioning. If you install a belt

together with sprockets, allow the following decrease in

center distance for installation and an increase in center

distance for tensioning.

If you install a belt over one flanged sprocket and one

unflanged sprocket with the sprockets already installed

on the drive, allow the following decrease in center dis-

tance for installation and increase in center distance for

tensioning.

Consider the following center distance allowances when

installing Eagle NRG

™

sprockets. Since flanges are not

necessary on Eagle NRG drives, only one table of center

distance allowances is provided.

Pitch Length

Range (mm)

Allowance (Decrease)

for Installation

8M, 14M Belts

(mm/in)

Allowance (Increase)

for Take-Up

8M, 14M Belts

(mm/in)

Less than 1525

2.5/0.1

1525-3050

5.0/0.2

Greater than 3050

7.5/0.3

Pitch Length

Range (mm)

Allowance (Decrease)

for Installation

8M Belts 14M Belts

(mm/in)

Allowance (Increase)

for Take-Up

8M, 14M Belts

(mm/in)

Less than 1525

22.5/0.9

36.5/1.4

2.5/0.1

1525 –3050

25.0/1.0

39.0/1.5

5.0/0.2

Greater than 3050 27.5/1.1

41.5/1.6

7.5/0.3

Pitch Length

Range (mm)

Allowance (Decrease)

for Installation

8M Belts 14M Belts

(mm/in)

Allowance (Increase)

for Take-Up

8M, 14M Belts

(mm/in)

Less than 1525

34.5/1.4

59.2/2.3

2.5/0.1

1525-3050

37.0/1.5

62.0/2.4

5.0/0.2

Greater than 3050 39.5/1.6

64.5/2.5

7.5/0.3

Pitch Length

Range (mm)

Allowance (Decrease)

for Installation

8M Belts 14M Belts

(mm/in)

Allowance (Increase)

for Take-Up

8M, 14M Belts

(mm/in)

Less than 1525

10.1/0.4

15.2/0.6

2.5/0.1

Greater than 1525 15.2/0.6

17.8/0.7

5.0/0.2

2. Place the belt on each sprocket and ensure proper engagement

between the sprocket and belt teeth.

3. Lengthen the center distance or adjust the tensioning idler to

remove any belt slack.

4. Using a tape measure, measure the span length of the drive.

Refer to dimension “P” in the diagram below. The span length

can be calculated using the below formula.

Shorter Center Distance

for Synchronous Installation

Center Distance

Longer Center Distance

for Synchronous Belt Take-Up

If you install the belt over two flanged sprockets that

are already installed on the drive, allow the following

decrease in center distance for installation and increase

in center distance for tensioning.