Cutaway of a jump liner installed inside a MIG gun

Jump Liners

Bernard® jump liners replace only the most commonly worn section of the liner, getting your gun back on the job in minutes while minimizing inventory.

CONSUMABLE

SEMI-AUTO MIG GUNS

BTB MIG GUNS

GENUINE OEM

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Back on the job within minutes
Replace only the worn section
Quick, easy neck change-outs
Minimizes liner inventory

Overview

Cost-effective and gets you back on the job within minutes.
Bernard® jump liners replace only the most commonly worn and clogged section of the liner, reducing the time a gun is offline and minimizing the liners you need to stock. They connect to standard rear load liners at the base of the neck and run through the high-wear area up to the contact tip. That also makes neck change-outs quick and easy, so one gun can be adapted to fit multiple applications.

Jump liners are used with rear load liners and are not compatible with AccuLock™ S front load liners.

Specifications

Compatible guns	Bernard® BTB MIG guns with rear load liners and rotatable necks
Wire sizes	0.035″–1/16″ (0.9–1.6 mm)
Lengths	14″ (356 mm) and 27″ (686 mm)
Use with	Rear load liners

Installation

Turn off power.
Remove the nozzle, insulator, contact tip, gas diffuser, and neck from the gun.
Remove the old jump liner from the back end of the neck.
Insert the new jump liner, making sure the liner stop is fully seated at the back end of the neck.
Trim the liner extending from the gun handle to 1/4″ beyond the handle for proper fit with the new jump liner.
Insert the tapered end of the neck into the end fitting of the gun handle, and secure it by turning the insulated nut clockwise.
Trim the liner at the nozzle end of the neck to the length for your consumables (see chart below).
File the cut end of the liner to remove burrs.
Reinstall the gas diffuser, contact tip, insulator, and nozzle.

Liner Trim Lengths at the Neck

Consumable	Diffuser	Trim Length
AccuLock™ S	D-A1-C, D-A2-C	3/4″
AccuLock™ S	DS-A1-C, DS-A2-C	5/8″
Centerfire™	D-1, DS-1	9/16″
TOUGH LOCK®	All retaining heads	3/4″
Quik Tip™	D118Q	7/8″
Quik Tip™	D114Q	3/4″
Elliptical	4235, 4635 (with 1500 series tips)	3/8″
—	4335, 4435 (with 7400 series tips)	1-3/8″

Part Numbers

Part Number	Description
QJL-3545	0.035″–0.045″ (0.9–1.2 mm) wire; 14″ (356 mm)
QJL-3545-XL	0.035″–0.045″ (0.9–1.2 mm) wire; 27″ (686 mm)
QJL-116	1/16″ (1.6 mm) wire; 14″ (356 mm)
QJL-116-XL	1/16″ (1.6 mm) wire; 27″ (686 mm)
QJLH-116	1/16″ (1.6 mm) heavy-duty wire; 14″ (356 mm)