PowerGrip® GT® Belt Drives

PowerGrip ® GT ® Belt Drives
Bushing and Shaft Specification Tables
– 5mm Pitch PowerGrip GT Sprockets
L
G
F
QD Type Bushings
D
B
A
E
3/ 4 " Taper
Per Foot
(on diameter)
Torque Dimensions (in) Cap Screws Approx. Weight
Bushing Capacity Bolt Avg. Bore
Style (lb-in) A B D E F G L Circle No. Size (lb)
SH 3,500 7/16 1 7/8 2 5/8 7/8 3/4 1/8 1 5/16 2 1/4 3 1/4–20x1 3/8 .8
SDS 5,000 7/16 2 3/16 3 3/16 7/8 3/4 1/8 1 5/16 2 11/16 3 1/4–20x1 7/8 1.2
SK 7,000 9/16 2 13/16 3 7/8 1 15/32 1 1/4 7/32 1 15/16 3 5/16 3 5/16–18x2 2.8
Stock Bore and Keyseat Information
Bushings are available from stock for all popular
bores within the bore range of each size bushing.
Table 1 lists the bore range and keyseat dimensions
for each QD bushing style.
Table 1–Bushing Keyseat Dimensions
Style Bores (in) Keyseat (in)
SH 1/2 -1 3/8 Standard
1 7/16-1 5/8 3/8 x 1/16
SDS 1/2 -1 5/8 Standard
1 11/16-1 3/4 3/8 x 1/8
1 13/16-1 15/16 1/2 x 1/16
SK 1/2 -2 1/8 Standard
2 3/16-2 1/4 1/2 x 3/16
2 1/4-2 1/2 5/8 x 1/16
Where standard keyseats and keys are specified, see
Table 2 for dimensions. Where bores do not permit
standard depth keyseats, a flat key of the proper
dimensions is furnished with the bushing.
Table 2–Standard Keyseat & Key Dimensions
Shaft
Keyseat (in) Keyseat (in)
Diameter (in) Width Depth Width Depth
5/16 - 7/16 3/32 3/64 3/32 3/32
1/2 - 9/16 1/8 1/16 1/8 1/8
5/8 - 7/8 3/16 3/32 3/16 3/16
15/16 - 1 1/4 1/4 1/8 1/4 1/4
1 5/16 - 1 3/8 5/16 5/32 5/16 5/16
1 7/16 - 1 3/4 3/8 3/16 3/8 3/8
1 13/16 - 2 1/4 1/2 1/4 1/2 1/2
2 5/16 - 2 3/4 5/8 5/16 5/8 5/8
Sprocket Installation
Prior to assembly, ensure that the tapered surface of
the bushing and sprocket are clean. Any dirt,
grease or oil must be removed. In no case is a
lubricant to be used.
Place the bushing into the sprocket hub and insert
the bolts to make a loose fit of the bushing to the
sprocket. Do not use lubricant on the bolts,
bushing, sprocket or shaft.
With the key in the shaft’s keyseat, slide the
assembled bushing/sprocket to its proper position
with the bolts to the outside. Smaller sprockets may
have to be installed with bolts on the motor side. If
difficulty is met in sliding the bushing onto the
shaft, wedge a screwdriver blade into the bushing’s
saw cut.
When the bushing/sprocket assembly is properly
lined up with its mating sprocket, remove the
screwdriver, if used. Tighten the bolts evenly and
progressively. Apply the recommended torque to
the bolts as given in Table 3.
Table 3 – Sprocket Installation
Bolts (in)
Torque Wrench
Bushing Style Qty Size Force (lb-in)
SH & SDS 3 1/4-20 x 1 3/8 108
SK 3 5/16-18 x 2 180
Sprocket Removal
To remove sprockets, first remove the belt. Then
loosen and remove bolts. Insert bolts into the
tapped backoff holes.
Progressively tighten the bolts until the sprocket is
loose on the bushing. Remove sprocket and
bushing, if necessary. If bolts cannot be inserted
into the backoff holes from the motor side, then use
a wedge to work the sprocket away from the bushing
flange.
If the bushing doesn’t slip easily off the shaft, wedge
a screwdriver blade in the bushing’s saw cut.
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