MULTIQUIP MAYCO LS300G Manual

TI_LS-Series_Flow_Control_Valve_Diagnostic.doc 08/23/2012
1
Technical Information
Product Group
:
CONCRETE PUMP
Model: LS-SERIES
This bulletin is provided for technical reference and service related updates.
The following process is performed with the ignition key in
the on position and engine off
FLOW CONTROL VALVE DIAGNOSTIC
1.
Navigate to (Screen 2) on the control panel. This
screen indicates the activity of the volume / flow
control valve # EM98273.
2.
The volume control switch is used for this test.
If you don’t feel vibration, it is possible that the flow control valve or the eccentric system
may have a fault. Verify the electrical system connectors for this control valve are properly
crimped and secured.
3. Put your hand on the flow control valve and a
ctivate
the volume control switch in both directions, when
activating these functions you should feel the flow
control valve vibrate if operating properly.
4.
When you activate the volume control switch in both
directions you should see the screen indicate the
change in direction as well.
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TI_LS-Series_Flow_Control_Valve_Diagnostic.doc 08/23/2012
2
Technical Information
VOLUME CONTROL VALVE TES
T
5.
If you don't feel vibration in the flow control valve, find
and cut the two wires that come from the electronic
control and to the flow control valve. This is to isolate
these circuits in case there is a short in the flow
control valve that may affect the following test.
6.
These wires are 12V DC and are (bidirectional).
Using a test meter, measure between the two wires
and verify 12V DC is present when the volume control
switch is activated. The (polarity) should change in
relation to the volume control operation - increasing or
decreasing the volume.
,
MANUAL VOLUME CONTROL ADJUSTMENT
8.
If voltage is present but the polarity does not change,
it is possible the problem is within the electronic
control. Check for faulty wiring or a bad connection in
the system.
7.
If voltage is present and the polarity changes as
indicated it is possible the problem is within the flow
control valve. The electric motor has either failed or is
mechanically stuck.
1.
Cut the volume control valve power cord.
3.
Loosen the flow control valve retainer screw (orange
circle) in order to free the housing. Adjust the volume
by rotating the housing in either direction for desired
setting.
4.
Retighten retainer screw after making desired volume
adjustment.
5.
This manual adjustment procedure can be used till the
defective flow control valve is replaced.
2.
Mark the outer volume control valve housing and nut
to relocate the valve back to its normal position if
needed.
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