Graco Reactor 2 Repair Parts page 43

4. Check functionality of the directional valve
(207).
a. Confirm that the directional valve cable
is connected properly from HCM port 15
to the directional valve body (207) and
is not damaged. Inspect wiring inside
the cover of the directional valve. See
Electrical Schematics, page
b. During operation, the direction indicator
lights on the directional valve body (207)
should switch on based on the valve that
is open.
c. Turn on the motor and stall the pumps at
the lowest pressure setting (compensator
knob turned fully counter-clockwise).
The pump will travel in either the A or
B direction until the pressure setting is
reached.
d. Identify the solenoid that is operating
by viewing the direction indicator lights
on the cover of the directional valve
(207). Measure voltage across the
associated terminals to determine if
proper voltage is reaching the valve
(approximately 200 to 240 VAC). See
Electrical Schematics, page
the table below, to identify the proper
terminals to measure across.
e. Trigger each proximity switch (211) with
the shaft of a screwdriver, confirming
each solenoid within the directional valve
(207) operates as described in table
below.
334946J
f.
For given
For
pump
pump
movement
105. movement
direction:
direction:
ADM
indicates
Indicator light
on directional
valve cover
Last
proximity
switch
triggered
Terminals in
directional
valve
energized
NOTE: For diagnostic purposes, it is possible
NOTE: NOTE:
to manually override the directional valve
105, and
by using a small screwdriver to depress the
button in the center of either directional
valve end cap. Depressing the button in the
right end cap should cause the pump to
travel to the right. Depressing the left button
should cause the pump to travel to the left.
5. If you have determined that the cause is
none of the previous possible causes, check
for a loose piston packing retaining bolt.
This causes the piston to contact the inner
face of the pump inlet flange before the
switching plate activates the proximity
switch. Shut down the unit and disassemble
the appropriate pump for repair.
Following step
Following Following
indicating indicating lights indicating
6. Check for loose or faulty proximity
switch cable or connections. Confirm the
connections to the proximity switches are
tight and internally free from oil and other
contaminates.
7. Swap the cables to the proximity switches to
see if the problem follows the switch or is in
the cable. Replace either the failed switch
or the cable.
8. Replace the HCM. See
If one or both sides are not operating
properly, according to the table, first
reconfirm wiring to directional valve
(207) per Electrical Schematics, page
then replace directional valve (207).
given
For given Pump driving driving
Pump Pump driving
pump left (toward (toward
left left (toward
movement park position) position)
park park position)
direction:
Left arrow,
labeled "b"
Right side
proximity
switch
Terminals
associated
with red and
orange wires
step 1, 1, 1, if if if the the proximity
step the
lights do lights do not do not light: not
Replace HCM, page
Troubleshooting
105,
Pump driving driving
Pump Pump driving
right (away (away
right right (away
from park park
from from park
position)
position) position)
Right arrow,
labeled "a"
Left side
proximity
switch
Terminals
associated
with black
and white
wires
proximity switch switch
proximity switch
light: light:
73.
43