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ROPE GRIPPER
WARNING! KEEP HANDS CLEAR OF ROPE GRIPPER. FORCES CREATED CAN
GRIPPER WILL NOT RESET - GRIPPER SET ON ROPES
•
Check location of rotating shaft in cam; if rotating shaft tube is against wear-out switch refer
to section concerning Lining Replacement
•
Check for open Safety circuit.
•
Check for blown fuse; refer to that section
GRIPPER DRIFTING CLOSED, CONTINUOUS RELOADING, ECR CONTACT
OPENING IN ERROR, PUMP UNIT CYCLING ON AND OFF
These are all indications that the Rope Gripper latch is not holding the Rope Gripper open. Read
and understand this section completely prior to performing any checks.
First, it should be understood that the "ROPE GRIPPER
•
the "Ready" or "Loaded" position, and thereafter held electro-mechanically with a latching
coil assembly (See Figure 6).
•
When the gripper rotating shaft reaches the loaded position, the Brake-Ready microswitch
contact will open turning off the pump. The pump should run just long enough to get the
latch hook past the trigger, and then shut off. The hydraulic pressure may slowly bleed off
until trigger and latch are resting together. At this point, the trigger and latch should be
engaged as shown in Figure 6.
•
Many problems can be traced back to the gripper not latching properly. Latch engagement
problems are typically a result of:
1) Dirty latch assembly (blow out with compressed air),
2) Brake-Ready microswitch out of adjustment, causing mis-engagement of the trigger and
latch,
3) Improper latch coil pressure (See Separate Bulletin 1164) or less commonly,
4) A malfunctioning latch coil, or
5) Misalignment (side to side) of the latch.
• Any of the above will be indicated by the Pumping Unit cycling on and off. This cycling
could be as quick as every 15 seconds or so, or as long as every couple of minutes. Repeated
cycling may cause unnecessary wear on the cylinder and pump unit, requiring premature
maintenance, fluid loss (cylinder leaks), and can cause motor and/or capacitor failure.
•
The Brake-Ready microswitch (Figure 8) should be adjusted to allow proper engagement of
the trigger and latch and to prevent the rotating shaft from bottoming out in the cam slot.
There should be approximately 1/32" clearance between the rotating shaft and the bottom of
the cam slot when the trigger and latch are engaged. In other words, the pump must run long
enough to allow the trigger and latch to properly engage, yet not so long as to push the
rotating shaft into the back of the cam slot.
After "ROPE GRIPPER
•
in-service gripper be observed for 15 minutes or so to assure proper operation.
•
If ECR contact is continuing to open in error, confirm ECR assembly and contact plate are
clean and free of debris, and are making good contact.
®
TROUBLE SHOOTING GUIDE
CRUSH FINGERS.
" installation or after any maintenance check, it is suggested that the
®
" is hydraulically pumped open to
®
BULLETIN 1144
Page 17 of 29
11/12/19
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