Table of Contents
Advertisement
Types NR, NRV Maintenance Instructions
5. Connect wire lead(s) to terminal strip. Solder black lead(s) to
common terminal of selector switch.
6. Operate cam electrically and adjust selector switch so con-
tact actuation takes place relatively early on cam lobe, and
that an over-travel (movement of operator arm after contact
actuates) of approximately 3/64-inch is achieved.
7. Check that main contacts open before the selector switch
actuates. Main contact and selector switch are properly
coordinated when an audible click is heard, from within the
tank, before selector switch contact actuates.
8. Adjust holding switch (if so equipped) so actuation takes
place after selector switch actuation and operator arm over-
travel is observed. A definite time lag between the actuation
of the selector switch and holding switch must be observed.
NOTE: It may be necessary to readjust selector switch to obtain
proper sequence and overtravel.
9. When selector switch and holding switch (if so equipped) are
properly adjusted, tighten screws to secure switch(es) to
support bracket. Run actuator through 25 opening and clos-
ing operations to be sure switch adjustments hold.
Figure 18.
Adjustment procedure for selector and holding
switches.
10
Figure 19.
Actuator mechanism equipped with holding switch.
ACTUATOR ASSEMBLY REPLACEMENT
To replace the actuator assembly proceed as follows:
1. Pull yellow handle down to open switch contacts.
2. Remove elastic stop nut, lockwasher and flatwasher from
operating shaft.
3. With a right angle punch or alien wrench force out straight
pin as shown in Figure 20.
4. Disconnect wire leads from terminal strip.
5. Remove four screws that secure actuator base plate to
housing. Carefully lift actuator assembly from housing,
pulling the drive lever straight from the operating shaft.
6. Place actuator assembly in mounting position and slip
drive lever over operating shaft. Loosely install the four
mounting screws that secure the base plate to the hous-
ing.
7. Insert straight pin through drive lever and operating shaft.
Install flatwasher, lockwasher and elastic stop nut. Tighten
stop nut firmly to prevent straight pin from backing out.
Moderate force is sufficient to tighten stop nut. Extreme
force on nut can break straight pin.
8. Tighten four actuator assembly mounting screws.
9. Attach wire leads to terminal strip, as shown in Figure 16.
10. Operate the switch electrically and check for binding.
Check adjustment of selector switch (and holding switch if
equipped) as described in "Shop Repair Procedures—
Selector and Holding Switch" section.
891000KMA
Advertisement
Table of Contents
