Duff-Norton SK6415-300 (SPA Series DC) User Manual

Page 11

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(26c) on potentiometer (26a). Nut (26c) should
not be tightened on potentiometer (26a) face.
b. Assemble gear (26b) on potentiometer (26a)


Gear should be assembled with a very light press. See sketch
for required dimension of gear on potentiometer. Take care
not to damage potentiometer.

38. Asembly of Fuse Holder in Cover (9)

a. Connect jumper wire (69) to one terminal of
fuse holder body (70a).
b. Install fuse holder body (70a) into cover.
c. Apply Permatex 2 Non-Hardening Sealant to
threads of cap screws (71) and install in cover
(9) to fasten fuse holder body (70a) in place.

39.Assembly of DC Cover

a.Connect motor lead wire to other terminal of
fuse holder body (70a).
b. Feed motor (53) lead wire with terminal and
jumper wire (69) terminal thru cover (9) (care
should be taken not to damage wires).
Assemble cover (9) on housing (42) aligning
dowel pins (27) with dowel pin holes in cover
(9). ( A light tap with a soft hammer may be
c. Install lock washers (8) and button head cap
screws (7).
d. Install fuse (72) in fuse holder cap (70) and
install assembled fuse (70B) and body cap into
fuse holder body (70A).
e. Feed terminal wires, (17) red, (18) blue, fuse
jumper wire, and motor lead through 1/2"
tapped hole in cover capacitor box outside of
f. Insert insulation (4) and assemble gasket (3)
and cover (2) with screws (1).
g. Adjust actuator limit switch settings per
instructions in paragraph 2-2.
h. If actuator has potentiometer, refer to
position indicator installation and calibration
instructions in Paragraph 2-4.
I. Attach gasket (12) and cover (11) with screws (1).

Assembly is now complete.

29. Pack housing (42) gear box cavity with Aeroshell #6

grease (no substitutes).

30. Assembly of Motor (53) to Housing (42)

a. Note location of flat on input pinion (29) by
marking spot on the coupling (47) posts. See
Figure 6-1B on page 14.
b. Insert grommet (50) on input pinion (29)
between coupling (47) posts and install “O”-
Ring (52) in cavity of insert (51).
c. Pack cavity with Aeroshell #6 grease.
d. If hole plug (54) is in rear end of motor,
e. Feed motor (53) lead wires through hole in
housing (42) lining up couplings (47) on input
pinion (29) and motor (53) shaft. (See Figure 6-
1B on page 14.) Motor screws should be lined
up with tapped holes in housing (42).


Alignment is critical at this point. See Figure 6.1B on
page 14. Note that input pinion (29) and motor (53) shaft
flats are opposite each other.

f. Assemble motor (53) into housing and install
screws (care should be taken during assembly
that end bells do not separate from motor (53)
g. With a screwdriver turn motor shaft by
inserting in motor shaft slot in end of motor. If
couplings are properly installed, the shaft will
turn freely in both directions. If motor shaft
will not turn, this is an indication that a
couplings are not properly installed.

31. Insert intermediate pinion shaft (32) in housing (42)

and place thrust washer (31) over shaft (30).
Assemble intermediate cluster gear (33) on shaft
and place thrust washer (31) on top.

32. Assemble bearing (28) on input pinion (29) (press on

inner bearing ring to prevent damage to

33. Pack housing (42) gear box cavity with Aeroshell #6

grease (no substitutes).

34. Insert dowel pins (27) in housing (42) and place

gasket (41) in place over dowel pins (27).

35. Install air vent (58) in outer tube (55) ( it may be

necessary to back outer tube out in order to
install air vent or to have vent in a more
desireable position). Spot drill tube and install
set screw (38) to hold tube in place.

36. Install spring (61) into end of screw (62).


If unit has potentiometer assembly (26) and gear (26b)
does not have to be replaced or if unit has no
potentiometer feature, proceed to Step 35.
37. Potentiometer Assembly (26)

a. If nut and washer were removed from
potentiometer, assemble washer (26d) and nut