3M Scotch-Weld Owner's Manual - Repair Procedures
© 3M 2006
12
Repair Procedures
Disconnect electrical and compressed air service.
First follow “Handle Disassembly Instructions” then
remove the two large Phillips head screws to the rear of
the wire terminals on the right hand side of the handle.
This allows the regulator assembly to swing free,
connected only by the hose going from the brass rear
of the regulator to the loading chamber assembly, and
the main hose assembly. Remove the main hose by
unscrewing the elbow fitting from the regulator. Use a
5/16’’ wrench to remove the loading chamber hose
from the regulator. Reassemble with a new regulator
using reverse procedure. Be sure hose fittings are quite
snug. Check for air leaks by activating the regulator.
Once this is done, reassemble the handle and heat
shield.
B. Regulator Kit
C. Valve Kit
3M™ Scotch-Weld™ Hot Melt Applicator PG II
must be heated prior to repairing nozzle valve.
CAUTION: WEAR SAFETY GOGGLES AND
HEAT RESISTANT GLOVES. DISCONNECT AIR
LINE BEFORE MAKING REPAIRS.
Nozzle valve assembly consists of the nozzle tip and
the nozzle valve. Remove the old valve assembly using
a 5/8’’ open-end wrench. Replace with new assembly.
Gently snug up the valve assembly. With a 1/2’’
wrench, also snug up the new tip.
Disconnect electrical and compressed air service.
Follow “Handle Disassembly Instructions,” page 11.
Remove the main hose by unscrewing the elbow fitting
from the air regulator. Cut the cable ties holding the
power cord and hose assembly together. Remove the
hose and reconnect the new hose using reverse
procedure. Add new cable ties to the hose and power
cord.
D. Hose Kit
Disconnect electrical and compressed air service.
Follow “Handle Disassembly Instructions.” The power
cord wire from the switch is removed from the bayonet
connector. The black and white wires are removed
from their respective terminals. Remember which wire
came off which terminal for reassembly. Consult the
electrical Wiring Arrangement on page 16. Reassembly
is accomplished by reversing the above.
E. Power Cord Kit
Disconnect electrical and compressed air service.
Follow “Handle Disassembly Instructions,” page 11.
Lift the switch from the slot in the right half of the
handle. The power lead can be unplugged from the
power cord receptacle. The other wires terminating in
ring lugs should be removed from their respective
terminals, noting that the black lead is connected to the
Thermal Cut Out Assembly and the white lead to the
heaters. Install the new switch using reverse procedure.
F. Switch Kit