User's Manual

Maintenance
14 312753E
Material Plunger Proximity
Switch Replacement
Tools Required
• M2.5 hex key for M4 flat head screws
• Metric wrench (13mm)
• Proximity Switch gauge
• Gauge M1978-1: Models 5/8, 6/10, 10/14
• Gauge MU1140: Models 13/20, 16/25
1. Turn OFF the hydraulic fluid motor and chemical
motor.
2. Disconnect the old proximity switch (CA, DA) from
the machine at the Amphenol connector.
3. Remove the two M4 flat head screws from the cover
plate on the material plunger housing (CH) or sen-
sor cap (DH), depending on which model you have.
Remove the cover plate. Wipe the inside bore clean
of any dirt and hydraulic oil.
4. The position of the material plunger (CG, DF) can
be determined by observing its relationship to the
proximity switch within the material plunger hous-
ing/sensor cap. The material plunger will be in a
sensing position for the open/pour position, and in a
non-sensing position for the closed/recirculation
position.
5. While holding the conduit (CB, DB) of the old prox-
imity switch stationary with one hand, loosen the
adapter (CC, DC) from the jam nut (CE, DD) with
the other hand. Loosen the jam nut and
lock-washer (CD, DE) on the proximity switch from
the material plunger housing/sensor cap. Remove
the proximity switch by unscrewing it from the
tapped hole.
6. Insert the sensor gauge (CF, DG) into the material
plunger housing/sensor cap.
7. Install the replacement proximity switch into the
appropriate threaded hole in the material plunger
housing/sensor cap as follows.
Models 5/8, 6/10, 10/14:
a. Thread the replacement proximity switch (CA)
until it contacts the flat cutout on the sensor
gauge (CF).
b. Maintain this position by tightening the
lock-washer (CD) and jam nut (CE) on the
threads of the proximity switch against the
material plunger housing (CH), with the
lock-washer between the jam nut and the mate-
rial plunger housing.
c. While holding the conduit (CB) stationary,
tighten the adapter (CC) by hand until it con-
tacts the jam nut (CE).
d. Remove the sensor gauge (CF) from the mate-
rial plunger housing (CH).
e. This step will ensure a clearance of
0.010-0.015 in. (0.254-0.381 mm) between the
material plunger (CG) and proximity
switch (CA).
Models 13/20 and 16/25:
a. Thread the replacement proximity switch (DA)
into the sensor cap (DH) until it contacts the
outer diameter of the sensor gauge (DG).
b. Maintain this position by tightening the lock
washer (DE) and jam nut (DD) on the threads of
the proximity switch against the sensor cap, with
the lock washer between the jam nut and the
sensor cap.
Do not operate the MixHead unless all proximity
switches are in place and the proximity switch alarm
is operative and armed.
See FIG. 4 on page 15 for models 5/8, 6/10, and
10/14. See F
IG. 5 on page 16 for models 13/20 and
16/25.
See FIG. 4 on page 15.
See FIG. 5 on page 16.