Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 2-11
2250 SERVICE/MAINTENANCE MANUAL HYDRAULIC AND AIR SYSTEMS
2
Pressure Sender Calibration
When the pressure sender calibration screen is accessed
and calibration is started, the crane's programmable
controller zeros the pressure senders to ensure accurate
pressure signals.
The pressure transducers must be calibrated at the following
intervals:
• A new programmable controller is installed
• A new CPU board is installed
• A new controller chip is installed
• A pressure sender is replaced
• Every 6 months
• Displayed pressure is wrong
Be aware that if there is any residual pressure in the
system during the calibration process, the display
pressure reading in the cab may not reflect actual
system pressure. See Note regarding replacing a
pressure sender at the end of this procedure.
To calibrate pressure senders, proceed as follows:
1. Access diagnostic screens by pressing limit bypass
switch while scrolling up with scroll switch.
2. Scroll until control calibration screen (Figure 2-10
)
appears.
3. Stop the engine (leave ignition and cab power switches
on), turn limit bypass key clockwise and hold. It is nor-
mal for yellow operating limits light to come on during
this procedure.
4. Calibration will not start if engine is running and following
screen appears. Likewise, calibration stops and
following screen appears if engine is started during
calibration.
5. Repeat step 3
.
6. When calibration starts, following screen appears to
indicate percent of completion as shown in Figure 2-12
.
It takes approximately 1 minute to complete process.
7. When calibration is complete, start screen in Figure 2-10
reappears.
8. Check the data bank in the upper right corner of the
screen. If a pressure sender/pump failed the test, the fail
item(s) binary number(s) is displayed.
Table 2-11 Pressure Sender Binary Numbers
NOTE: The cause of 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 (see Section 2).
• 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 ground at 0 psi.
Controls Calibration
The controls must be calibrated at the following intervals:
• When a pump is replaced
• When a pump control (EDC or PCP) is replaced
• When a new programmable controller is installed
• When a new CPU board is installed
• When a new controller chip is installed
• When there is a noticeable increase in the time it takes a
crane function to engage when the handle is pulled back
from off
• Every 6 months
To calibrate the controls, proceed as follows:
FIGURE 2-10
PRESS SENDER CAL
BYPASS TO START
FIGURE 2-11
PRESS SENDER CAL
ENGINE MUST BE OFF
FIGURE 2-12
PRESS SENDER CAL
___% COMPLETE
Binary
No.
Pump
No
Description
1 1 System Pressure (Main Hoist)
2 3 System Pressure (Swing Left)
4 3 System Pressure (Swing Right)
8 1 Charge Pressure (Main Hoist)
16 2 System Pressure (Boom & Luffing Drums)
32 4 System Pressure (Travel/Drum 9 on MAX-ER)
64 5 System Pressure (Left Travel)
128 0 System Pressure (Independent Luffing)

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English