Maeda MC285CB-3 - Page 232

Section 5 – GENERAL MACHINE MAINTENANCE Mini-Crawler Crane M A E D A
5-42 9/2020 MC285CB-3
Measuring Wire Rope
Measure the wire rope diameter nominal
dimension at the section where the rope
repeatedly passes through the sheave. Measure
from three directions and average the value.
• Wire rope for winch:
• IWRC 6 x Fi (29) 0/0 7 x 46 m
• Wire rope for extending no. 4 boom:
• IWRC 6 x Fi (29) 0/0 9 x 4.92 m
• Wire rope for retracting no. 4 boom:
• IWRC 6 x Fi (29) 0/0 8 x 8.28 m
• Wire rope for extending no. 5 boom:
• IWRC 6 x Fi (29) 0/0 6 x 4.655 m
• Wire rope for retracting no. 5 boom:
• FC 6 × 37 0/0 5 × 7.85 m
Winch Wire Rope - Correcting Twisted
Rope
NOTICE: Change the hook direction of the wire
rope (inverse the hook block side and winch drum
side) periodically to extend the life of the wire
rope.
NOTICE: Do not winch up or down while the hook
block is on the ground. Otherwise, the wire rope
may become tangled on the winch drum.
Straighten twisted winch wire rope using the
following procedure:
1. With the hook in normal position, note the
twisting direction and number of twists.
Fig. 5-86
2. Move the winch lever to LOWER (push
forward) to lower the hook block until just
before it makes contact with the ground.
Lower the hook block by either moving the
boom lifting lever to LOWER (push forward)
to lower the boom or by moving the boom
telescoping lever to RETRACT (pull toward
you) to retract the boom.
3. Turn the Starter Switch to OFF to stop the
machine.
4. Remove the wedge socket pin fixing bolt (3)
to remove the wedge socket (2).
Fig. 5-87
5. Twist the end of the wire the number of times
the hook is twisted, in the opposite direction
the hook block is twisted.
6. Once the wire rope is untwisted, install the
wire rope.
7. Start the machine and move the boom lift
lever to RAISE (pull toward you) to increase
the boom angle to its maximum.
8. Move the boom telescoping lever to EXTEND
(push forward) to extend the boom to its
maximum.
9. Move the winch lever to repeat raising and
lowering the hook block several times.
10. Carefully and neatly spool up the wire rope
onto the winch drum with some tension
applied to the rope.
Fig. 5-88
11. Repeat the above procedure until the hook
untwists. If the wire rope is still twisted after
repeating the procedure above, replace the
wire rope.