Charge Pressure - Manitowoc 999 Service And Maintenance Manual

999 SERVICE/MAINTENANCE MANUAL
a. If 0 appears, all items have passed.
b. If any number other then 0 appears, use
to determine which items have failed.
HYD SYSTEM CHECK
* PRES SENDER 0%
Percent
Complete
Binary
Calibration Item
Number
1 Front Drum
2 Rear Drum
4 Boom Hoist
8 Swing Right
NOTE: The cause of a failed calibration or faulty display
pressure reading in the cab may not be the
pressure sender. The cause of the fault could be
trapped air or hydraulic pressure in the system.
Before replacing a pressure sender, do the
following:
• Perform pressure sender calibration steps.
• Attach an accurate hydraulic pressure gauge
to the quick-coupler at the suspect pressure
transducer.
• If pressure appears on the gauge, bleed the
corresponding system so the gauge reads
zero pressure.
• Repeat calibration steps and check pressure
on the display in the cab with the engine
running at idle — the display reading and the
gauge reading should be the same.
• Before replacing a pressure sender, check the
signal voltage at the sender. It should be 1.0
volt against group at 0 psi.
Manitowoc
Table 2-10.
Binary
Number
15
Binary
Calibration Item
Number
16 Swing Left
32 Travel Right
64 Travel Left
128 Accessory System
FIGURE 2-9
Published 05-16-17, Control # 233-03

Charge Pressure

The charge pressure screen
system's charge pressure is within 275 – 400 psi (19 – 27
bar), as monitored by the computer.
Charge pressure should be checked 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
• Every 6 months
To check charge pressure, proceed as follows:
1. Start engine and run at low idle.
2. Access calibration screen (see
Screens).
3. Screen indicates state of charge pressure:
a. If 0 appears, charge pressure is okay for all items.
b. If any number other then 0 appears, use
to determine which items are not within specified
charge pressure.
HYD SYSTEM CHECK
* CHARGE PRES
Binary
Calibration Item
Number
1 Front Drum
2 Rear Drum
4 Boom Hoist
8 Swing Right
1
Same Pump as Swing Right
HYDRAULIC SYSTEM
(Figure 2-10) indicates if each
Accessing Calibration
Table 2-10.
Binary
Number
15
Binary
Calibration Item
Number
1
16
Swing Left
32 Travel Right
64 Travel Left
128 Accessory System
FIGURE 2-10
2-13
2