(9)
Holding the end ring (3) down, install retaining ring (1), release pressure. Inspect retaining ring being
certain it is completely seated in its groove.
(10)
Install pipe plugs in end ring with air outlets - static test - check for audible air leaks and with a soap
solution to be certain no o-rings have been cut or carbon seal damaged. A moderate leakage may be
expected until carbons seals have seated against end rings during operation.
(11)
Align key slots in end rings with slots in shaft. Install keys (13), screws (11) and lockwashers (12).
4-7.1.2 Air Compressor Drive Clutch. (Figure 4-21)
a.
Disassembly.
(1)
Remove all but two of the screws (1) and lockwashers (2). Slowly remove the remaining screws loosening
alternately.
(2)
Lift off pressure plate (3) and remove spacers (4) and adjustment spacers (5).
(3)
Remove shoulder bolts (6), washers (7) and springs (8).
(4)
Remove outer torque plate (9), with diaphragm (12) attached, inner torque plate (17) and hub (18).
(5)
Remove all the screws (16), lockwashers (15), clamp rings (13 and 14), diaphragm (12) and seals (10 and
11) from outer torque plate (9).
(6)
To separate backplate (21) from hub (24), remove screws (22) and lockwashers (23). Remove register
pins (20) if replacement is necessary.
b.
Inspection and Repair.
(1)
The outer and inner torque plates (9 and 17) should be replaced if friction plate is excessively worn.
(2)
Closely inspect diaphragm (12) for cracks, breaks or holes. Replace if any flaws are found.
(3)
When assembling clutch, use new springs (8) and seals (10 and 11).
c.
Assembly.
(1)
Apply a light coat of petroleum jelly to inner and outer seals (10 and 11) and install them in grooves of
outer torque plate (9).
(2)
Position the diaphragm (12) on the outer torque plate (9) with the circle located near the outer edge of
diaphragm facing out. Position the diaphragm so that the air inlet holes in the outer torque plate line up
with black circles on diaphragm.
4-85
