Manitowoc Published 11-06-15, Control # 040-13 5-5
2250 SERVICE/MAINTENANCE MANUAL HOISTS
The block-up limit control consists of the following
components (see Figure 5-2
):
1. Normally closed limit switch assembly fastened at any or
all of the following locations (multiple limit switches are
wired in series):
a. Lower boom point
b. Upper boom point (standard or extended)
c. Fixed jib point
d. Luffing jib point
2. Weight freely suspended by chain from each limit switch
actuating lever (weight encircles load line).
3. Lift block clamped to single-part load line or lift plates
fastened to multiple-part load block.
For detailed drawings of limit switch locations, see Boom
Wiring and Limits Drawing in Section 4 of Operator Manual.
Block-Up Limit Control Operation
During normal operation, the weight overcomes spring force
and rotates the actuating lever away from the limit switch
lever. This action allows the limit switch to close the load
drum up and boom/luffing jib down electric circuits. The load
can be hoisted and the boom/luffing jib can be lowered.
When the weight is lifted by the lift block or lift plates, spring
force rotates the actuating lever against limit switch lever.
This action causes the corresponding limit switch to open the
load drum up and boom/luffing jib down electric circuits.
The load drum and boom hoist pumps stroke to off. At the
same time, the load drum and boom/luffing jib parking brakes
apply to stop the load drum from hoisting and the boom/
luffing jib from lowering.
Load Block Level Transmitter
See Figure 5-2 for the following procedure.
The optional load block level transmitter is only used with
tandem drum operation. See load block level screen topic in
Section 10 of this manual. The wireless screen on digital
display indicates load block level battery status.
1. Load block level transmitter is mounted on block (10).
Locate on block where there are no obstructions
between transmitter and receiver on boom top.
2. When reeved, load block level transmitter must be on
left side of load block when viewed from operator’s cab.
3. Use a smart level to check level sensor zero. Follow the
procedure below if a zero adjustment is required:
a. Open enclosure.
b. If European Standard transmitter is used, press to
install button must be pressed to enable.
c. Loosen screw on each side of sensor (Item 15) and
turn sensor slightly either way until sensor is zeroed.
d. Tighten screws on each side of sensor when
adjustment is complete.
The transmitter is shipped with six Alkaline type size D
batteries. We recommend replacing batteries with six
Lithium type size D batteries for longer battery life.
Installation
See Figure 5-4 for installation of the weights.
The block-up limit control must be installed according to the
assembly drawing following this section.
Securely fasten the electric cords to the boom and jib with
the metal straps and nuts provided.
When equipped with more than one block-up limit switch,
wire limit switches in series.
Connect the electric wires to the normal-closed contacts
inside each limit switch.
Storing Electric Cord
The electric cords for the boom, fixed jib, and luffing jib are
long enough to accommodate the maximum length of each
attachment.
Store the excess cord for the boom and luffing jib on the reel
mounted on either butt (Figure 5-3
).
Disengage the reel locking pin to allow the reel to be wound.
Engage the locking pin to lock the reel in position. The power
supply cord to the reel must be disconnected before the reel
can be wound.
Store the excess electric cord for the #132 fixed jib, #140
fixed jib, or extended upper boom point by winding the cable
around the brackets on the jib butt.
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