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Current Switch Assembly 620 or 622-064, ECR Contact Plate 618-067, Actuating Angle 600-051
For Older Style Switch Assembly: 620 or 622-050, See Figure 9, Page 24
MICROSWITCH ADJUSTMENT PROCEDURE – Read and understand this section
completely prior to performing any checks.
1. To check adjustment, first switch pumping unit OFF. This will activate the "ROPE
" and grip the ropes. Note the position of the large washer and Allen Screw on
®
GRIPPER
top of the latch coil (see Figure 6).
2. Switch pumping unit ON. This will return "ROPE GRIPPER
While returning to the ready position, watch the large washer at the top of the latch coil. The
washer (and Allen Screw) should rise with the passing of the latch under the trigger, then
lower and return to its original position. If it does, move on to Step 5.
3. If the washer did not return to the fully seated position, either a.) the pump is not running
long enough, indicating microswitch out of adjustment, or b.) as has happened on very rare
occasions, the latch is slightly out of adjustment causing the trigger to bind on one edge of
the latch. Visually, when the trigger and latch engage, you should see run-by clearance
between the sides of the latch and the trigger, and the latch should be fairly well centered on
the trigger. Run Steps 1 & 2 again to check your results. If the latch is centered, move on to
Step 5.
4. If the latch is not centered, you should consider calling Hollister-Whitney Technical support.
To center the latch, first switch pumping unit OFF. This will activate the gripper and grip the
ropes. Slightly loosen screws holding latch, and tap latch into a more centered location,
making sure the latch remains square. Retighten screws and repeat Steps 1 & 2.
5. Re-install the security screws so that they just touch the rotating shaft.
" to the "READY" position.
®
BULLETIN 1144
Page 18 of 29
FIGURE 8
11/12/19
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