Manitowoc Published 10-01-2012, Control # 045-08 5-1
777 SERVICE MANUAL HOISTS
5
SECTION 5
HOISTS
HOIST DRAWINGS
Applicable hoist and load block drawings are attached at the
end of this Section.
MINIMUM BAIL LIMIT ADJUSTMENT
The minimum bail limit assembly is a protective device. It
automatically stops the corresponding load drum from
lowering when there are three to four wraps of wire rope
remaining on the drum.
The drum can be operated in the hoist direction when the
minimum bail limit is contacted.
Weekly Maintenance
See Figure 5-2 for following procedure.
1. Check for proper operation of minimum bail limit
assembly, as follows:
a. Land load.
b. Pay out wire rope from auxiliary drum.
c. Load drum must stop when there are three to four
wraps of wire rope remaining on drum.
2. Check that cap screws holding rollers on bail limit lever
are tight.
3. Check tension of return spring. If necessary, adjust
eyebolt so spring holds bail limit rollers snugly against
bare drum.
Wire Rope Removal
To remove wire rope from any load, activate limit bypass
switch on front console in cab. This action allows the drum to
be operated in the lower direction when the minimum bail
limit is contacted.
Electric Wiring
See the Electric Schematic at the end of Section 3 of this
manual.
Past production limit switches have a light (LED) that
indicates proper operation as follows:
• Light on — limit switch closed (normal operation).
• Light off — limit switch open (drum stopped in lowering
direction).
See Figure 5-1 for limit switch wiring.
WARNING
Falling Load Hazard!
Do not operate auxiliary load drum with less than three full
wraps of wire rope remaining on drum. Doing so can
cause wire rope to be pulled out of drum and load to drop.
FIGURE 5-1
LIMIT SWITCH WIRING
Past Production
N/C = Normally Closed
N/O = Normally Open
B = Black Wire
G = Green Wire
W = White Wire
J = Jumper Wire
Current Production
178715
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