Graco Reactor 2 H-30 Repair Manual page 42

Troubleshooting
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
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.
f. If one or both sides are not operating
properly, according to the table, first
reconfirm wiring to directional valve (207) per
Electrical Schematics, page
directional valve (207).
For given given Pump driving
For For given Pump Pump
pump pump pump left left (toward left
movement movement movement park park position) park
direction:
direction: direction:
ADM indicates
Indicator light
Left arrow,
on directional labeled "b"
valve cover
Last proximity Right side
switch proximity
triggered switch
Terminals in Terminals
directional associated
valve with red and
energized orange wires
Note
For diagnostic purposes, it is possible to
manually override the directional valve 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.
42
94, and the table
94, then replace
driving Pump driving driving
driving Pump Pump driving
(toward (toward right right right (away (away (away
position) position) from from park from park park
position)
position) position)
Right arrow,
labeled "a"
Left side
proximity
switch
Terminals
associated
with black and
white wires
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 Following Following step step step 1, 1, 1, if if if the
lights do do not not light: light:
lights lights do not light:
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
the proximity the proximity switch proximity switch indicating switch indicating indicating
Replace HCM, page
334946C
66.