3M PG II, Owner'S Manual

Page: 15 / 68

© 3M 2020. 15
Repair Procedures
Heat Shield Disassembly Instructions
G. Heat Shield Kit
Disconnect electrical and compressed air service.
Remove the heat shield assembly by removing the two Phillips
head screws from either side of the heat shield and the one
Phillips head screw on the heat shield immediately above the
loading chamber. Reassemble, following reverse procedure.
H. Heater Kit
Disconnect electrical and compressed air service.
Follow “Heat Shield Disassembly,” per procedure G. All heater
wires must be disconnected from their respective terminal strips.
With a suitable drift punch, drive the old heaters out through the
top of the heat block. All four heaters should be replaced making
sure to reconnect the wires in the proper places. Refer to the
“Wiring Arrangement” and “Electrical Control” diagrams, page 18.
Be sure that heaters are bottomed out in the heat block. They
should not stick out above the block more than 1/4" (7 mm). It may
be necessary to gently tap the heaters into place, but be careful
not to crack the ceramic.
To ensure that heaters remain in place, gather all the wires
together approximately 1/2" (13 mm) below the heat block and
tightly attach the cable tie provided with the kit.
Heater Check-Out
Disconnect electrical and compressed air service.
Use Volt/Ohm Meter to check electrical continuity of each
heater. If continuity exists, heater is okay. First remove heat
shield. Heaters need not be removed from the block. Check in the
following sequence: left front, right front, right rear, left rear. To
start the check, remove only one wire from its connection on the
terminal strip.
Place one probe from the meter on the connector of the wire that
has been removed, and with the other probe, touch the matching
connector on opposite side of the applicator. If needle on Volt/
Ohm Meter swings, heater is okay.
Reconnect wire that was removed first, and continue sequence.
If one or more heaters are burned out, refer to Repair Procedure,
pages 13-16.