ELECTRIC SYSTEM 2250 SERVICE/MAINTENANCE MANUAL
3-44
Published 11-06-15, Control # 040-13
Table 3-4
System Faults
Listed below are the faults which turn on the system fault alert (red light and beeper) in the operator’s cab. When the alert
comes on, scroll to SYSTEM FAULT group of digital display to determine which fault has been reached; take corrective action.
Display Reading Cause of Fault Function Response
PUMP 1 CHARGE PRESS Low charge pressure at load drum pump. Load drum brake applies and pump strokes to
neutral to stop load drum. If drop in charge
pressure is intermittent, operation may be
resumed once load drum control handle is
returned to off.
Verify that cause of fault is low pressure and
correct cause as soon as possible. If pressure
is correct, replace pressure sender.
BOOM ANGLE SENDER Sender output voltage 0.0 volts or above
9.7 volts.
All functions operable. Machine level or boom
and luffing jib angle displays will not be
correct. Correct cause of sender fault as soon
as possible.
Neither fault is active when crane is operated
in SETUP mode.
* LUFF JIB ANGLE SENDER
LOW AIR PRESSURE Manifold air pressure below 90 psi (6,2
bar).
If air pressure continues to drop, load drum
parking brakes will apply.
HYD TANK LEVEL Less than 75% level. Stop and check oil level - fill tank (reservoir).
LOAD PIN Zero (0) output voltage from pin. MAX-ER counterweight stops and remains in
last position and boom hoist stops and is
inoperable in up direction.
MOTION Deselected drum turns. If a deselected load drum moves, all drum
brakes and clutches apply and pumps shift to
neutral to stop all load drums.
If a selected load drum rotates down when
handle is in UP or NEUTRAL position, all drum
brakes and clutches apply and pumps shift to
neutral to stop all load drums.
If a deselected boom or luffing hoist drum
moves, brakes apply and pumps shift to
neutral to stop both hoists.
Stop and restart engine to correct fault (reboot
programmable controller).
* MAX-ER SYSTEM One of three MAX-ER transducers not in
operating range of 0.6 to 9 volts.
Differential pressure between left/right
side strap cylinders is 1,200 psi (83 bar).
Counterweight tray level is over 3° in right
or left direction.
MAX-ER counterweight stops and remains in
last position.
Check and replace faulty transducer(s).
Check hydraulic system and repair.
Level counterweight tray.
MAST ACCUMULATOR Mast stop cylinders, MAX-ER luffing jib
stop cylinders, or accessory system
pressure is not in range.
See ACCUM diagnostic screen to determine
cause of fault and correct problem as soon as
possible.
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