Section 7
MAINTENANCE
28
wise lowers both the high and low pressure
equally.
DIFFERENTIAL ADJUSTMENT:
Differential is the difference between the high and
low pressure settings; 10 psi (0.7 bar) is typical.
Turn the differential adjusting screw to the lower
(reset) setting. Turning the screw counterclockwise
widens the differential by lowering the re-set (lower)
setting only.
When the pressure switch adjustment is complete,
the pressure regulators should be adjusted for the
pressure at which modulation of air delivery should
begin. In this case, that pressure will be 100 psi (6.9
bar) for the spiral valve, and 108 psi (7.4 bar) for the
Sullicon. The regulator is adjusted by loosening the
jam nut on the end of the cone-shaped cover of the
pressure regulator. When the jam nut is loosened,
turn the adjusting screw clockwise to increase or
counterclockwise to decrease the setting.
Above 100 psi (6.9 bar), the regulator should allow
pressure to flow into the control chamber of the spi-
ral valve. Movement of the spiral valve is indicated
by an indicating rod that protrudes from the sump
tank side of the first stage stator. When the rod is
fully extended, the spiral valve is fully open
(unloaded position). The spiral valve rack should
start to move at this time.
Above 108 psi (7.4 bar), the regulator should allow
pressure to flow into the control chamber of the
Sullicon. The Sullicon lever should start to move at
this time. Cycle the Control System several times
and re-check all pressure settings.
DRIVE COUPLING INSTALLATION AND ALIGN-
MENT)
Refer to Figures 7-8. For coupling installation and
alignment, the tools required are a straight edge, a
measuring scale, one set of feeler gauges, a set of
standard Allen wrenches, one set of standard sock-
et wrenches and a set of dial indicators are recom-
mended.
The first step in coupling installation is assembling
the taper lock bushings to each hub. Proceed
according to the following instructions for assembly
of the bushings and hubs:
1. Clean the shafts, bores, keys and keyseats. Be
sure the keys fit properly - file if necessary.
2. Place the bushing in the hub and match the half
holes of the bushing with the half holes of the
hub.
3. Oil the threads and points on the setscrews.
Place the setscrews in the holes loosely.
4. Be sure the bushing is in the hub loosely and
then slip the assembly onto the shaft.
5. Tighten the setscrews alternately and evenly until
they are pulled up securely. Torque to 410 in.-
lbs. (46.1 Nm).
6. Hammer against the large end of the bushing,
using sleeve or block to avoid damage. Turn
setscrews slightly. Repeat this procedure until
the screws will no longer turn. DO NOT exceed
410 in.-lbs. (46.1 Nm).
Figure 7-8 Drive Coupling Alignment
TABLE 6-1 INSTALLATION DATA
Max. Operating Misalignment
Tightening Coupling Coupling Capscrew
Torque Gap Parallel Angular
in.-lbs. +0.30 in./7.6mm Offset degrees in./mm (I)
T.I.R. (II)
370 1.50 .005 .5 .005
41.8Nm 38mm .127mm .5 .127mm
(I) Angular misalignment (length) equals maximum A minus mini-
mum B as shown in Figure 7-8. DO NOT exceed values in Table
6-1 above.
(II) Total Indicator Run-out.
Disconnect all power lines at their source before
attempting maintenance or adjustments.
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