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6. At this point, the coil should be activated. If the large washer and Allen Screw are seated
properly, it should not be possible to raise the washer and Allen Screw with thumbnail
pressure. If you can raise the washer, check all power to and across the coil. If there is a
problem with the power or the coil, repair it now and move on to Step 9.
7. Remove one or both of the connecting arms from the gripper. Check the clearance between
the rotating shaft and the cam slot (approximately 1/32", see Figure 6), and reinstall the
connecting arm(s). Note: If clearance approaches zero, contact Hollister-Whitney Technical
support.
8. Older style switch assemblies have two screws in the Actuating Angle, while current
production has one and a contact bar. (See Figure 8) Locate the Brake-Ready Microswitch
Adjustment Screw. To make the pump run longer, adjust the screw outwards in ¼ turn
increments. WARNING: It is advised that you check the rotating shaft/cam slot
clearance after each adjustment by repeating this procedure. Additionally, if 1 full turn
(4 adjustments or 4 x ¼) has been made to the microswitch and the washer seems to be fully
seated but still moves up with no improvement, see Bulletin 1164 (Setting Rope Gripper
Latch Pressure) found at:
Whitney for additional technical support.
9. Remove the security screws and retest the "ROPE GRIPPER
BLOWING CONTROLLER FUSES – Read and understand this section completely prior to
performing any checks.
1. Check type of fuse being used. Note: Hollister-Whitney specifies a 3-amp Fusetron fuse,
which is a dual element time delay fuse. (Diagram 4). Many controller manufacturers have
not supplied this fuse. If the fuse is not correct, consult with your controller manufacturer.
A 4 Amp MDL or 5 Amp MDL fuse may be substituted but only with the approval of your
controller manufacturer. If the fuse is correct, see CHECKING PUMP UNIT AMP DRAW
below.
2. Electric Pump runs, but Gripper does not open. First check hydraulic oil level. Refer to
FLUID LEVEL LOW line item below. If the pump runs too long at low fluid levels, the
fuse may blow, and in some cases, the pump, motor and/or motor capacitors may fail.
3. Check resistance of the Dump Valve Coil. Resistance should not be "open" it should be
about 0.5 Mega Ohms. If you obtain an "open" reading, replace the Dump Valve Coil.
4. If Fluid Level, Dump Valve Coil, and Amp Draw are OK, place the Dump Valve in the
Manual position and run the pump. If the gripper opens with the pump running and the valve
in manual position, replace the Dump Valve.
CHECKING PUMP UNIT AMP DRAW
1. Make sure the security set screws are installed or that the "ROPE GRIPPER
the ropes.
2. Switch the pump unit OFF.
3. Disconnect the power supply from the controller at RG1 and RG2 on the Pumping Unit.
4. Disconnect hydraulic line from "ROPE GRIPPER®" at the Quick Connect.
5. Get an extension cord and remove the female end. Bare the wire ends and connect cord L1
to RG1 and cord L2 to RG2. Plug the extension cord into a 120 VAC wall outlet. Put a
Clamp-on Amp Meter around cord L1 and switch the pump unit ON. The pump motor
should run. (NOTE: It may be necessary to jump out RG3 and RG4 to get pump unit to
run.) After the initial high spike, you should see the amp draw drop and level out to no more
than 7 amps. 7A or less will indicate that there is no problem with your pump unit and you
should consult with your controller manufacturer. If your Amp Draw is more than this value,
call Hollister-Whitney Technical Support for assistance.
http://www.hollisterwhitney.com/support/
and call Hollister-
" to check adjustment.
®
" is clamped to
®
BULLETIN 1144
Page 19 of 29
11/12/19
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