Southworth APCU Series, Руководство по эксплуатации и техническому обслуживанию

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34 APCU Owner’s Manual
WARNING!
I
f the motor continues to run after the dump
motion should stop, the machine may be dam-
aged. Move the target so that the motor stops
at the point where the dump motion should
stop.
Setting End of Travel for “Dump Down” Function:
This proximity switch is located on top of the base tube
of the base frame, toward the dump side of the machine.
The target is located on the bottom back outside of the
tilt frame.
1. Position this switch so that, at the end of the
“Dump Down” cycle, the bottom of the tilt frame
rests on the cross tube at the dump end of the
base frame. The tilt frame must be supported by
the base frame when it is in the down position.
This switch must be activated when the bottom
stop pads of the tilt frame are as close as possible
to the base frame. The distance should be 1/8”
or less.
WARNING!
If this switch activates too soon, the tilt frame
will stop before it reaches the base frame.
When the hydraulic power unit is switched off,
the tilt frame will drop onto the base frame and
cause erratic motion of the load enclosure.
Inspecting and Cleaning a Control Valve
1. Check that the valve is receiving the correct control
voltage. When the valve is supposed to be energized,
the solenoid should receive 24V DC.
2. Check the continuity through the solenoid coil. With
the power off, check the resistance through the coil
using an Ohmmeter. There should be a low resistance
(a few Ohms). If the meter shows no resistance, the
coil may be shorted. Substitute a coil which is known
to be good. If the meter shows an infinitely high re -
sistance, the coil should be replaced.
3. Each valve used on this machine is designed with a
solenoid coil which can be changed without removing
the valve or spilling any hydraulic fluid. To change the
solenoid:
• Disconnect the wire leads to the solenoid.
• Loosen the knurled nut at the top of the solenoid,
and remove the nut and O-ring.
• Slide the solenoid off of the core tube.
4. To clean the parts on the valve spool, you must
remove it from the valve body. De-pressurize the
hydraulic system by lowering both lifting mecha-
nisms completely. Be sure to turn off the power to
the machine.
5. Unscrew the core tube. Remove the valve plunger
and inspect it for dirt or metal chips which could
block the valve action. Clean the valve plunger
as required, then blow it clean with compressed
air. Before reassembly, verify that the inside of the
valve body is clean and free of debris. Depress the
plunger by hand several times to be sure it moves
freely.
6. To reassemble, reverse the steps listed above. The
nut which holds the solenoid should be finger-tight
only!
Removing a Cylinder
This section will tell you how to remove a cylinder
from the tilt mechanism or the dump mechanism. Two
cylinders are used on each mechanism. Both types of
cylinders are double-acting, and both have the same
bore diameter. The following procedure will apply to
both cylinder types.
Before beginning this procedure, please read and un-
derstand this entire section.
WARNING!
Before removing the cylinder from either
mechanism, lower the load enclosure
completely to the loading position. See the
section “Servicing the Unit Safely” before
starting work.
1. Before you remove a cylinder, be sure that you
have these items on hand:
• Replacement cylinder or cylinder packing kit.
• A supply of new hydraulic oil. Contaminated oil
may damage the new packing.
• Containers to catch the used oil.
• A clean place to work which will not be dam-
aged if you spill some oil (especially if repack-
ing the existing cylinder).
2. Lower the load enclosure completely to the loading
position (as discussed earlier).
3. Turn off the electrical power at the main disconnect
or circuit breaker. Follow standard lock-out/tag-out
procedures.
4. Disconnect the hydraulic supply line to the bottom
end of the cylinder. Place the free end into a con-
tainer to collect the used oil.
5. Repeat the same procedure for the hydraulic supply
line to the top end of the cylinder.