Trigger Replacement And Set Screw Adjustment; Mechanical Valve Replacement - Lincoln Electric Magnum PRO 250 LX Operator's Manual

MAGNUM PRO 250 LX & LX GT SPOOL GUN
TRIggER REPLACEMENT AND SET SCREw
ADjUSTMENT
1. Remove the following items:
a. Gun tube barrel
b. Plastic screw covers and screws above the trigger (not
shown). Use 2.5mm hex Allen Key
c. The main screw in the middle of the handle. Use 3 mm
hex Allen Key.
2. Once the above items are removed pull the front handle off.
3. Unscrew the top screw that keeps the trigger secured.Use a
flat head screwdriver
4. Replace the trigger and secure with screw
5. Reinstall front handle to the gun
6. Attach the gas hose to a source of air or inert gas
7. Place metric 1.27mm Allen key into the set screw located at
the trigger top
8. Pry the actuator inside the hole in the direction shown in the
Fig. F.1, this will push the actuator and engage with the set
screw.
9. Make sure no air is leaking during this process, while rotating
the set screw CW (pry until you do not hear the air coming out
of the neck)
10. Once the set screw has engaged with the actuator, remove
the Allen key and press/test the trigger back and forth a few
times and check for air flow in both positions (Active and non-
active)
11. If hard friction is observed or felt, turn set screw a quarter
rotation CCW until satisfied
12. Test weld before adding blue loctite into the set screw hole at
the trigger top (red part)
FIGURE F.1
A
Observe all Safety Guidelines detailed throughout this manual
Screw Driver
Shaft OD 2mm
Allen Key
1.27mm
Insert screw driver
to the hole as shown

MECHANICAL vALvE REPLACEMENT

1. Remove the following items:
a. Gun tube barrel
b. Plastic screw covers and screws above the trigger (not
shown). Use 2.5mm hex Allen Key
c. The main screw in the middle of the handle. Use 3 mm
hex Allen Key
2. Once the above items are removed pull the front handle off.
3. Find the mechanical valve parts on the bottom of the Torch
body
4. Begin removing the parts in this order:
a. 4 Philips head screws on the mounting plate
b. Mounting plate
c. Actuator and spring actuator
d. 2 Philips head screws holding the valve assembly
e. The valve assembly and the valve spring
5. Replace parts with 9SS26374-107 kit
6. Reassemble the components into the gun by placing the
valve spring back in first
7. Carefully add two drops of provided Super Lube grease to the
valve assembly and reinstall
Note: For best performance please service o-rings every six
months by putting Super Lube grease on o-rings using the
above steps
8. Fasten down the valve assembly with the 2 screws
9. Reinstall the actuator and actuator spring after adding a small
amount of grease to the actuator
10. Place and fasten down the mounting plate
11. Install the front handle
12. Check gas flow of the gun to make sure it was completed
correctly
FIGURE F.2
Cavity
Channel
13
TROUBLESHOOTING
1
2
3
4
5
6
7