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 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) & 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.
Содержание 6415 Series
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