Duff-Norton SK6415-200 (SPA Series AC) - Manual (Page 7)

capacitor from box.
6. Disconnect jumper wires (17 and 18) and motor (53) lead
wire terminals from switches (16). Remove jumper
wires (17 and 18) and pull motor (53) lead wires into
capacitor box.
7. Remove set screw (38) from housing (42).
8. Remove button head cap screws (7) and lock washer (8).
9. Lift cover (9) from housing (42) passing motor (53) lead
wires through hole in buttom of capacitor cavity in
cover (9). Slight tapping with soft hammer may be
necessary to overcome dowel pins (27).
10. Remove thrust washer (35) and thrust bearing (36)
from cover (9). Thrust washer (35) and thrust
bearing (36) may stay on spacer nut (37) in
housing (42) and can be removed in Step 18.
11. Remove limit switch shaft assembly, consisting of
limit switch shaft (22), limit switch nuts (23)
and worm (24), from cover (9). Allow limit
switch shaft (22) to drop out of flange bearing
(25). Tilt shaft assembly and remove from
cover (9).
NOTE
If limit switch nuts (23) or worm (24) do not have to be
replaced, proceed to Step 14.
12. Thread limit switch nuts (23) off of limit switch shaft (22)
13. Remove worm (24) from limit switch shaft (22).
NOTE
If switches (16), insulation (19) or limit switch bracket (21) do
not have to be replaced, proceed to Step 16.
14. Remove screws (20) and bracket (21) from cover (9).
15. Remove screws (15), switches (16) and insulation (19)
from bracket (21).
16. Press clevis end bushing (6) out of cover (9). If bushing
(6) is not damaged it should not be removed.
17. Remove bearing (28), bushing (34) and flange bearing
(25) from cover (9).
NOTE
Bushing (34) and flange bearing (25) should not be removed
unless they are damaged. Bearing (28) may stay on pinion
(29) and can be removed in Step 18.
18. Remove thrust washer (31) from intermediate pinion
shaft (32). Bearing (28) from pinion (29), thrust
washers (35) and thrust bearing (36) from
spacer nut (37) may have been removed in
Step 10.
19. Remove spring (61) from end of screw (62).
20. Remove intermediate cluster gear (33), intermediate
pinion shaft (32) and thrust washer (31).
7
SECTION IV
MAINTENANCE
4-1. LUBRICATION
Duff-Norton recommends the use of the following
lubricant in conjunction with proper maintenance
procedures of this unit: Exxon Ronnex Extra Duty #1.
4-2. REQUIRED TOOLS
A bearing puller, press, soft jaw table clamp and
common hand tools are required for proper disassembly
and assembly.
4-3. GENERAL PROCEDURES
Duff-Norton recommends following these procedures
during disassembly and assembly:
1. Tag critical parts to facilitate reassembly.
2. Mark mating surfaces to ensure proper meshing.
3. Clean and lubricate parts as required.
4. All seals must be replaced at time of rebuild,
if damaged.
5. All screws, washers and other small common parts
must be replaced if mutilated in any way.
4-4. DISASSEMBLY
Disassemble the actuator as follows while referring to
Figure 5-1. Read instructions thoroughly before
disassembling.
NOTE
Disassembly should be accomplished on a clean cloth.
1. Clamp actuator housing (42) in vise (use soft
jaws). Unit should be in horizontal position with
outer tube (55) up.
2. Remove screws (1) from limit switch box
cover (11) and remove limit switch box cover
(11) and gasket (12).
3. Remove nut retainer (14).
NOTE
If unit has potentiometer assembly (26) and
potentiometer (26a) or gear (26b) is not damaged
proceed to Step 4.
a. Loosen nut (26c) and remove potentiometer
assembly from nut retainer (14).
b. Remove gear (26b) from potentiometer (26a).
Washer and nut do not have to be removed
from potentiometer (26a).
CAUTION
Take care not to damage potentiometer when removing
gear.
4. Remove screws (1) from capacitor box cover
(2) and remove cover (2) and gasket (3).
Remove insulation (4) from capacitor box.
5. Discharge capacitor (5). Disconnect motor (53) lead
wire terminals from capacitor (5). Remove
6415-200 manual 10/10/06 11:46 AM Page 7