Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 5-3
999 SERVICE/MAINTENANCE MANUAL HOISTS
5
MINIMUM BAIL LIMIT/PRESSURE ROLLER
See Figure 5-2
The minimum bail limit assembly is a protective device. It
automatically stops the 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.
Optional drum pressure roller assemblies are available for
front and rear load drums.
Minimum Bail Limit
Weekly Maintenance
1. Check for proper operation of minimum bail limit
assembly, as follows:
a. Land load.
b. Pay out wire rope from selected load drum.
c. Load drum must stop when there are three to four
wraps of wire rope remaining on drum.
2. Check that cap screws (10) holding rollers (11) on bail
limit lever are tight.
3. Check tension of return spring (8). If necessary, adjust
eyebolt so spring holds bail limit rollers snugly against
drum.
Adjustment—Front or Rear Drum
1. Land load for selected drum.
2. Loosen adjusting screws (5) and remove pins (6) from
actuator (4) and lever (7). Position actuator so it does
not contact limit switch roller (3) when step 3
is
performed.
3. Pay out wire rope until bail limit rollers (11) are against
bare or lagged drum with three full wraps of wire rope
remaining on drum.
4. Position actuator out against limit switch roller only
enough to open limit switch (light off).
5. Securely tighten adjusting screws, drill holes in actuator
and lever, and insert pins to lock adjustment.
6. Adjust return spring eyebolt (9) to dimension shown in
Figure 5-2
.
7. Spool six to seven wraps of wire rope onto load drum.
Pay out wire rope from load drum. Drum must stop when
there are three to four wraps of wire rope remaining on
drum.
If necessary, repeat adjustment.
Adjustment—Auxiliary Drum
See Figure 5-3
1. Land load for auxiliary drum.
2. Loosen jam nut on adjusting screw and turn screw fully
into lever so screw does not contact switch when step 3
is performed.
3. Pay out wire rope until bail limit rollers are against bare
or lagged drum with three full wraps of wire rope
remaining on drum.
4. Turn adjusting screw out against limit switch roller only
enough to open limit switch.
5. Securely tighten jam nut on adjusting screw to lock
adjustment.
6. Adjust return spring eyebolt to dimension shown in
Figure 5-3
.
7. Spool six to seven wraps of wire rope onto load drum.
Pay out wire rope from load drum. Drum must stop when
there are three to four wraps of wire rope remaining on
drum.
8. If necessary, repeat adjustment.
WARNING
Falling Load Hazard!
Do not operate any 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.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English