LGMG T20J, Руководство по обслуживанию

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Maintenance Manual of Elevating Work Platform
4
1.3 Inspecting the Boom
Wear Pad
1) Inspect the wear pad every 1,000 h or
yearly.
2) The wear pad is located on the housing
surface and inner wall of the boom to
reduce friction. It is necessary for safe
operation of the machine to maintain the
wear pad in good condition. Continuous
use of wear pads that are extremely worn
will result in damage to components and
unsafe operating conditions.
3) Extend the boom to check if the wear pad
loosens, if the wear pad loosens, torque the
securing bolt to: 28Nm. Inspect play
between the wear pad and the boom, if the
play is more than 1mm, arrange shims to
achieve zero play and zero drag. Replace
the wear pad if necessary. Part numbers of
shims
，
please refer to the Parts Manual,
and select the correct parts. Upon
installation of the shims, it is necessary to
extend the boom multiple times to eliminate
potential binding.
1.4 Inspecting the Wire Rope
Figure 1-2 Boom Telescope System
1. Cover Plate
2. Extend Rope Anchor
3. Extend Rope
4. Extension Pulley Block
5. Cover Plate
6. Retract Pulley Block
7. Retract Rope
8. Retract Rope Anchor
After long-term operation of equipment, the wire
rope will stretch, resulting in boom sections not
synchronized, separation of wire rope from
pulley, boom shaking during extension, contact
of wire rope to inner wall of boom sections or
rubbing between wire rope and inner wall of the
boom and other problems. It is necessary to
conduct periodic checks on the condition of the
wire rope. Inspect the stretching wire rope for
stretching every 250 h or quarterly.
1) Raise the boom to horizontal, extend the
boom, and inspect if the second-section
and third-section booms are synchronized
in the extension process of the boom. If the
third-section
boom lags behind the
second-section boom, this means the wire
rope is loose.
2) Raise the boom to horizontal, extend the
boom, and inspect whether or not the
third-
section boom shakes or if there is “flap”
sound from the wire rope whipping the
inside of the boom section during extension.
If this happens, it indicates the wire rope is
loose.
3) Remove the rear cover plate (1) of the
boom, and see if the extend rope anchor (2)
deflects to one side. See if the retract rope
anchor (8) deflects to one side. If deflection
exists, it means the wire rope is loose.
4) Raise the boom to horizontal, extend the
boom completely, remove the rear cover
plate (1) and the side cover plate (5), and
visually inspect for wear on the extension
pulley block (4,) the retract pulley block (6),
the extend rope (3) and the retract rope (7).
The pulley shall be fixed firmly secured
without play, non-uniform wear of the pulley
groove shall be less than 3mm, and the
wear of the pulley flange shall be smaller
than 10% of the original wall thickness.
There must be no loosening, breaks, and
serious corrosion in the wire rope. During
extension and retracting, there must be no
flapping in the pulley. In the case of any
abnormalities, stop using the machine
immediately and tag out the machine.