Section 7
MAINTENANCE
40
be necessary to shut the compressor down, remove
the pressure switch cover, and disconnect one of the
two lead wires that are connected to the micro--
switch (contact block). After disconnecting the lead,
tape the exposed wire with electrician’s tape to make
sure that it does not come in contact with any metallic
surface.
DANGER
!
DO NOT touch the electrical contacts, terminal or
leads with any metallic object. Severe electrical
shock may occur.
With the lead taped, you may start the compressor
again. Allow the sump pressure to stabilize.
The sump pressure should read 30 to 35 psig (2.1 to
2.8 bar).
Once this is checked, shut the compressor down
once againandreconnect the taped lead and replace
the pressureswitch cover. Atthis time, start thecom-
pressor and cycle the Control System several times
and re--check all pressure settings and adjustments.
DANGER
!
DO NOT touch the pressure switch, electrical con-
tacts, terminal board or leads with any part of the
body or any un--insulated metallic object. Severe
electrical shock may occur.
PRESSURE REGULATOR ADJUSTMENT
Start the compressor and adjust the service valve to
maintain service air pressure at rated pressure (115
psig for example). T urn the adjusting screw on the
regulator until air just begins to escape from the con-
trol air orifice. The regulator is now properly set.
DRIVE COUPLING INSTALLATION AND MAIN-
TENANCE
Refer t o F igur es 7 -- 5 and 7 -- 6. F or c oupling ins talla-
tion and maintenance the tools required will be a
measuring scale, one set of standard Allen
wrenches, and oneset of standard socket wrenches.
For installation and maintenance of the drive cou-
pling, follow the steps explained below.
DANGER
!
Disconnect all power at source, before attempting
maintenance or adjustments.
STEP 1 -- COUPLING GUARDS
There are three 5/16” screws from each of the wire
guards located on each side of the unit/motor adap-
tor for the 25/30 HP (18/22 KW) packages,or the two
3/8” bolt/nut/washer assemblies from the plate guard
and adaptor located on the top side.
TABLE 1 INSTALLATION DATA
Horsepower
Coupling
Element
Coupling
Hub Gap
Tightening
Torque (Wet)
25 & 30 HP/
045672
.09-.125 in
55 ft.-lbs
60, 75, 100 250004--638 1 10 ft.-lbs
(75Nm)
(149Nm)
18 & 22 KW
(45, 55, 75 KW)
.09-.125 in
SERIES 10 (25-40HP/ 18-30KW)
2.4-3.2 mm
2.4-3.2 mm
Figure 7-5 Drive Coupling ”Hub” Gap Check
STEP 2 -- MOUNTING HUBS/ELEMENT
The coupling halves havea unique borefor the motor
and the air--end. The air--end half is to be located so
that the hub is positioned against the shaft shoulder
and secured in place by two set--screws. The motor
half should remain free floating until the element is in
its proper location. The motor half is then positioned
within assembly maintaining an axial coupling gapas
lis ted in F igur e 7 -- 5. T her e ar e two s et -- s c r ews lo-
cated on the motor coupling half also. Prior to start-
ing of package, assure the set--screws are secure to
eliminate potential movement of the hub.
7.9 TROUBLESHOOTING-- STANDARD ELECTRO-
MECHANICAL
The information contained in the Standard Electro-
Mechanical Troubleshooting chart has been com-
piled from field report data and factory experience. It
contains symptoms and usual causes for the de-
scribed problems. However,
DO NOT
assume that
these are the only problems that may occur. All avail-
abledataconcerninga problemshould besystemati-
cally analyzed before undertaking any repairs or
component replacement procedures.
A detailed visual inspection is worth performing for
almost all problems and may avoid unnecessary
additional damage to the compressor. Always re-
member to:
1. Check for loose wiring.
2. Check for damaged piping.
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