RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
070.200-IOM (DEC 11)
Page 6
226 3
13
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16
96.8 1/64 .40 .003 .076 14 19.5
5
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16
‑ 24 UNRF
263 4
5
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109.5 1/32 .79 .004 .102 22 30.6
3
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8
‑ 24 UNRF
301 4
7
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123.8 1/32 .79 .004 .102 37 51.5
7
/
16
‑ 20 UNRF
351 5
7
/
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149.2 1/32 .79 .004 .102 55 76.5
1
/
2
‑ 20 UNRF
401 6
11
/
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169.9 1/32 .79 .004 .102 49 68.2
1
/
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‑ 20 UNRF
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13
/
16
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1
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27.0 1
13
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46.0 1
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28.6 .004 .104 55 74.6
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/
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‑ 24 UNF 13 17.6
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5
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109.5 5
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36.5 2
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61.9 1
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‑ 24 UNF 13 17.6
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‑ 20 UNF 13 17.6
DBZ-B HUB FACE MAXIMUM TOTAL CLAMP BOLT
COUPLING SPACING +/- INDICATOR READING TORQUE (LUBE)
SIZE
SIZE in. mm in. mm in. mm ft-lb Nm
MOTOR MOUNTING
The following procedure is required only when the motor is
mounted at the job site.
1. Thoroughly clean the motor feet and mounting pads of
grease, burrs, and other foreign matter to ensure firm seat‑
ing of the motor.
2. Attach the motor to the base using the bolts and motor‑
raising blocks, if required. Bolt snugly through the base.
3. Weld the four kick bolts into place so that they are posi‑
tioned to allow movement of the motor feet.
4. Now that the motor has been set, check to see that the
shafts are properly spaced for the coupling being used. Re‑
fer to the coupling data tables for the applicable dimension
(pages 5 and 6).
CHECKING MOTOR/COMPRESS OR ROTA TION
Make sure coupling hubs are tight-
ened to the shaft before rotating the
motor to prevent them from flying
off and possibly causing serious injury or death.
COMPRESSOR ROTATION IS
CLOCKWISE WHEN FACING
THE END OF THE COMPRES-
SOR SHAFT. Under NO condi‑
tions should the motor rotation be
check ed with the coupling center
installed as damage to the com‑
pressor may result. Bump the mo‑
tor to check for correct compressor
rotation. After verification, install
gear or disk drive spacer, as applicable.
COMPRESSOR/MOTOR COUPLINGS
INSTALLATION
RWB II units are arranged for direct motor drive and require
a flexible drive coupling to connect the compressor to the
motor. Before installing, perform the following:
1. Inspect the shaft of the motor and compressor to ensure
that no nicks, grease, or foreign matter is present.
2. Inspect the bores in the coupling hubs to make sure that
they are free of burrs, dirt, and grit.
CH COUPLING DATA TABLE
3. Check that the keys fit the hubs and shafts properly.
CH COUPLING – The T.B. Woods Elastomeric CH Coupling
is used in most applications up to 600 HP. It consists of two
drive hubs and a loose, gear‑type Hytrel Drive Spacer. The
split hub is clamped to the shaft by tightening the clamp
screws. Torque is transmitted from the motor through the
elastomeric gear which floats freely between the hubs. Install
as follows:
1. Slide one hub onto each shaft as far as possible. It may
be necessary to use a screwdriver as a wedge in the slot to
open the bore before the hubs will slide on the shafts.
2. Hold the elastomeric gear between the hubs and slide both
hubs onto the gear to fully engage the mating teeth. Center
the gear and hub assembly so there is equal engagement
on both shafts. Adjust the space between hubs as specified
in the CH Coupling Data Table below.
3. Torque the clamping bolts in both hubs to the torque value
given in the CH Data Table. DO NOT USE ANY LUBRICANT
ON THESE BOLTS.
4. Proceed to Coupling Alignment.
DBZ-B COUPLING – The Thomas DBZ‑B coupling is used
on applications above 600 HP and with sleeve bearing mo‑
tors that do not have axial end float constraint. The DBZ‑B
coupling consists of two drive hubs and a flexible metal disc
drive spacer that is bolted to both hubs. A flexible steel disc
pack serves as the drive element. This disc pack is bolted to
the coupling hubs and prevents axial end float between the
compressor and motor shafts which may occur with sleeve
bearing motors. On sleeve bearing motors, the magnetic
center must be determined and maintained by securing the
coupling to the motor shaft with the shaft properly located.
Injury may occur if loose clothing,
etc. becomes entan gled on the
spinning motor shaft.
If the motor is coupled to the compressor using a fixed‑end‑
play coupling, such as a DBZ‑B coupling, and the motor is not
properly centered, additional thrust loads will be transmitted
to the compres sor bearings that could result in premature
bearing failure. Install as follows:
1. Remove the eight locknuts and long bolts attaching the
center member to the disc pack.
2. Slide the disc pack and coupling hub assemblies on their
respective shafts.
DBZ-B COUPLING DATA TABLE
* Required for shaft seal removal.
CH COUPLING HUB MAX TOTAL KEYWAY
COUP- BETWEEN SHAFT SPACING SHAFT ENGAGEMENT FACE INDICATOR
CLAMP BOLT
SETSCREW
LING MIN* MAX MIN MAX SPACING READING TORQUE (DRY) TORQUE
SIZE in. mm in. mm in. mm in. mm in. mm in. mm ft-lb Nm
SIZE
ft-lb Nm
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