HYDRAULIC SYSTEM 999 SERVICE/MAINTENANCE MANUAL
2-14
Published 05-16-17, Control # 233-03
Control System
The control system calibration screen (Figure 2-11) indicates
whether the pump center is within the allowable range for
each pump’s Electric Displacement Control (EDC). The
allowable range is 5 – 25% pump command signal for hoist
pumps, and 2.5 – 20% in each direction for swing.
Control system calibration must be performed at the
following intervals:
• When a new programmable controller is installed
• When a new CPU board is installed
• When a new controller chip is installed
• When a pump is replaced
• When a pump control (EDC or PCP) is replaced
• When there is a noticeable time increase to engage a
crane function when handle is moved from off
• Every 6 months
To check control system calibration, proceed as follows:
1. Access calibration screen (see Accessing Calibration
Screens).
2. Turn PARK ON for all crane functions (drums, boom
hoist, swing, travel).
3. Start engine and run at high idle. It is normal for yellow
operating limits light to come on during this procedure.
Calibration will not start if engine is not running at
high idle. Calibration will stop if engine speed is
decreased during calibration.
4. When calibration starts, percent (%) of completion is
displayed on screen.
NOTE: It takes approximately 2 minutes to complete
check.
5. Check binary number in screen when calibration is
done:
• If 0 appears, all items have passed.
• If any number other then 0 appears, use Table 2-10.
to determine which items have failed.
HYD SYSTEM CHECK
* CONTROL CAL 0% 15
FIGURE 2-11
Binary
Number
Percent
Complete
Binary
Number
Calibration Item
1 Swing Right
2
Swing Left
1
4 Front Drum
8 Rear Drum
16 Boom Hoist
32 Auxiliary Drum (in butt)
1
Same Pump as Swing Right
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