Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 3-31
999 SERVICE/MAINTENANCE MANUAL ELECTRIC SYSTEM
3
Table 3-3 Operating Limits
Listed below are the limits which turn on the operating limit alert (yellow light and continuous buzzer). When the alert comes
on, the OPERATING LIMIT group of the display will indicate which limit has been reached. Take corrective action.
[1] Optional item
[2] Mast angles are measured from transport position, which is 0°.
Display Reading Function Response Corrective Action
BLOCK UP Stops load drums from hoisting and boom/luffing
jib from lowering.
Lower corresponding load or raise boom or
jib
MAX DOWN Stops boom from lowering (limit usually set at
0°).
Stops luffing jib from lowering when boom to
luffing jib angle is:
• 60° – #135 Luffing Jib.
•55° – #149 Luffing Jib.
Raise boom or luffing jib
MAX UP 1 Stops boom from rising when maximum up limit
is reached.
Stops luffing jib from rising when boom to jib
angle is 168°. This angle can be bypassed to
raise jib to MAXIMUM UP 2 angle of 170°.
Lower boom/luffing jib
MAX UP 2 [1] Stops luffing jib from rising when boom to jib
angle is 170°. This limit can be bypassed only
when boom is below 50°.
Lower luffing jib
CONFIRM MODE Load drums and boom hoist inoperable until an
operating mode is selected and confirmed.
Select and confirm the desired operating
mode (see instruction in this section)
MAX BAIL Drum stops hoisting. Operate drum in lowering direction
MIN BAIL Drum stops lowering. Operate drum in hoisting direction
GANTRY DOWN [2] Boom hoist inoperable in both directions if gantry
is down when mast angle is 120° or more.
Raise gantry with switch on remote control
JIB BELOW HORIZONTAL [1] Luffing jib operable. See capacity chart for luffing
jib minimum operating angles.
Raise luffing jib above horizontal
LOAD MOMENT [1] Stops all load drums from hoisting and boom/
luffing jib from lowering.
Land load on load drum or raise boom or jib
MAST TOO FAR FWD [2] Boom hoist inoperable in lowering direction
(occurs if mast is lowered below 175°).
Raise mast. Further lowering is not
intended – mast will fall
MAST SYSTEM Boom hoist inoperable in both directions. Stop operating immediately. Determine
cause of fault – faulty boom hoist and/or
accessory system pressure sender – and
correct
FUNCTION IS PARKED Function inoperable because it is parked. Turn corresponding park switch off and sit
down in operator’s seat

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English