Lincoln Electric SP-170T IM794 Operator's Manual page 17

The brake should be adjusted with a spool of
wire installed. When properly adjusted it should
move freely but not coast.
1. With wire spool installed, check free movement and
coast of the spool.
2. To tighten the brake turn the wing nut clockwise in
1/4 turn increments until coasting stops.
3. To loosen the brake turn the wing nut counter-
clockwise in 1/4 turn increments until the wire spool
moves freely without coasting.
Refer to Figure B.4
1. Release the Spring Loaded Pressure Arm (1)
rotate the Idle Roll Arm (2) away from the Wire
Feed Drive Roll (3). Ensure that the groove size in
the feeding position on the drive roll matches the
wire size being used. See Maintenance section for
further information.
2. Carefully detach the end of the wire from the
spool. To prevent the spool from unwinding, main-
tain tension on the wire until after step 5.
3. Cut the bent portion of wire off and straighten the
first 4" (100 mm).
4. Thread the wire through the ingoing guide tube
(4), over the drive roll (3), and into the outgoing
guide tube (5).
5. Close the idle roll arm and latch the spring loaded
pressure arm (2) in place. Rotate the spool coun-
terclockwise if required to take up extra slack in
the wire.
6. The idle roll pressure adjustment wing nut is nor-
mally set for mid-position on the pressure arm
threads. If feeding problems occur because the
wire is flattened excessively, turn the pressure
adjustment counter-clockwise to reduce distortion
of the wire. Slightly less pressure may be required
when using 0.023 – 0.025" (0,6 mm) wire. If the
6. drive roll slips while feeding wire, the pressure
should be increased until the wire feeds properly.
7. Refer to Figure B.5. Remove gas nozzle and con-
tact tip from end of gun.
2
3
5
8. Turn the SP-170T ON ("I").
9. Straighten the gun cable assembly.
10. Depress the gun trigger switch and feed welding
wire through the gun and cable. (Point gun away
from yourself and others while feeding wire.)
Release gun trigger after wire appears at end of
gun.
11. Turn the SP-170T OFF ("O").
12. Replace contact tip and gas nozzle.
Gun Handle
13. Refer to Figure B-6. Cut the wire off 3/8" – 1/2" (10
– 13 mm) from the end of the tip. The SP-170T is
now ready to weld.
Wire from spool.
1
4
The Wire Drive Feed Roll
can accommodate two wire
sizes by flipping the wire
drive feed roll over.
Gas Diffuser/
Contact Tip
Gas Nozzle