BEFORE INSTALLATION:

1. Make sure that the shaft, barrell & bore of the bushing, XT bushed conveyor pulley hub bores, keys and keyways are clean and free of burrs, paint, etc.
2. For proper operation, make sure that the shaft size is within the size limits shown in Table 1. Some applications may benefit from tighter shaft tolerances. CAUTION: Mounting an XT Bushing on a shaft smaller than the size limits shown in Table 1 may result in a faulty assembly. The assembly may come off the shaft or undesirable assembly runout may result.

MOUNTING:

1. Using a hoist or other appropriate means, place the shaft through the pulley being careful not to damage the bore of the hub(s) and locate in the desired position. When mounting on an inclined surface, if required, make sure the conveyor pulley and shaft do not drop during installation.
2. It may be necessary to slightly wedge open the saw slot on some Bushings in order to start the bore and position the bushing onto the shaft. A narrow edged regular screw driver may be used. Avoid excessive wedging forces in Bushing saw slot as this may damage or break Bushing.
3. Align the shaft keyseat with the Bushing bore keyway and install the key. Make sure the key runs the entire length of the bushing bore. For XT Conveyor Pulleys requiring two bushings, shaft keyways must be in line with each other for proper bushing installation. Some Bushings with shallow keyways are supplied with shaft keys. For proper operation use the key supplied with the bushing. CAUTION: To assure proper transmission of torque, all bushings used in drive pulleys must be keyed to the shaft. Tightening the cap screws to a torque higher than shown in Table 2 may lead to product failure. AVOID.
4. Align the non-threaded holes in the bushing flanges with the threaded holes in the hubs. Insert the cap screws and thread them by hand three or four turns. See Diagram 1 below.
5. Position the assembly axially on the shaft such that it is aligned with its running mate(s). Be sure to check for adequate clearance between the assembly and other nearby components if applicable.
6. Using a torque wrench and appropriate socket, tighten the cap screws in a diagonal fashion. Tighten to the torque shown in Table 2. When the cap screw torque is at or near recommended torque, make at least two more sequential rounds to assure all cap screws are at Table 2.

REMOVAL

1. Remove all cap screws in a diagonal fashion.
2. Heavier Pulleys may require a hoist or other means of supporting during the remainder of removal procedure. When removing from an inclined surface, make sure the bushing and Pulley do not drop during removal.
3. Insert cap screws in all threaded bushing flange holes. Tighten the cap screws against hub face until the screw force releases the bushing from the hub. If the bushing does not release immediately, tap on the hub with a hammer.
4. When two bushings are used, completely loosen the screws on one bushing before proceeding to loosen the other one.
5. Remove the bushings and shaft from the pulley using the appropriate means.

OPERATING INSTRUCTIONS:

1. All pulleys should be checked for tightness on the shaft. For the first month of operation, inspect the bushing cap screw torque at least once a week.
2. The pulley lagging should be checked for wear, cracks, and tightness. Changes in coefficient of friction between drive
   pulley and belt could result in belt slippage.
3. The ends of pulleys should be inspected for cracks or other signs of stress or fatigue. The pulley should not be operated if a crack develops.
4. Take-up pulleys and belt tensioning devices should function normally. Excessive belt tension could fail pulleys, bearings, and shafts.
5. Pulleys should be checked for vertical and lateral alignment. Misalignment can result in belt tracking problems and pulley wear.
6. Bearings should be visually checked for excessive shaft
   movement in the bearing during operation.
7. All bearings should be checked for alignment, lubrication, and tightness of locking devices.
8. Conveyor pulleys should not be cleaned during operation. It is extremely dangerous to be near the rip point when the pulley is in operation.
9. The conveyor should not be operated without the necessary protective guards.

Shaft Size Range (inches)

Lower Shaft
Dia. Limit
(inches)

Shaft Size Range (mm)

Lower Shaft
Dia. Limit
(mm)

Above

Through

Above

Through

-

1 1/2

-0.003

-

38.1

-0.076

1 1/2

2 1/2

-0.004

38.1

63.5

-1.102

2 1/2

4

-0.005

63.5

101.6

-.0127

4

6

-0.006

101.6

152.4

-0.152

6

8

-0.007

152.4

203.2

-.0178

8

9

-0.008

203.2

228.6

-0.203

9

-

-0.009

229.6

-

-0.229

XT

SAE Grade 5 Cap Screws

Cap Screws Torque

SIZE

Quantity

Size

(in-lbs)

(ft-lbs)

(N-M)

15

4

1/4-20UNC

95

8

10.7

20

4

5/16-18UNC

192

16

21.7

25

4

3/8-16UNC

348

29

39.3

30

4

7/16-14UNC

552

46

62.4

35

4

1/2-13UNC

840

70

94.9

40

4

9/16-12UNC

1200

100

135.6

45

4

5/8-11UNC

1680

140

189.8

50

4

3/4-10UNC

3000

250

339.0

60

4

7/8-9UNC

4600

383

519.8

70

4

1-8UNC

7200

600

813.6

80

4

1-1/8-7UNC

9000

750

1017.0

100

6

1-1/8-7UNC

9000

750

1017.0

120

8

1-1/8-7UNC

9000

750

1017.0

140

10

1-1/8-7UNC

9000

750

1017.0