Weldpro Fabrications Line Boring

Line boring is a service we offer for earthmoving plant equipment and machinery. It is a service that consists of repairing worn and damaged pin or boreholes. This damage can be caused by misalignment of bores, a lack of grease from maintenance or blocked and damaged grease nipples, worn or out-of-round damaged bores due to fatigue and excessive use.

The line boring equipment is powered by a hydraulic drive system that turns a 2-inch solid bar with a carbide tip cutter, this in effect is like a lathe fitted to the machine or attachment and the machining and repair can begin. We can repair holes from 40mm to 350mm in size onsite or at our workshop in Ravenhall Vic.

The machines we repair can be found on construction sites, quarries, mining, civil projects, waste and recycle industries, cranes and forklifts, hook lift bin trucks etc.
Some of the items we can repair are excavator sticks and booms, quick hitches, buckets, centre pins on grapples and grabs, hydraulic cylinder eyes, centre hitches on wheel loaders, Load frames, dump truck body’s, graders, waste material handlers, dozer blades and worn holes on push arms, worn holes on equalizer bars, and all other steel pins or bushes that are worn.

Worn Grapple Bores
Worn Grapple Bores
Worn and pitted bore
Worn and pitted bore

Bore Welding Process

We carry a robotic welder for the welding of all holes ready to be machined to size. Each damaged hole that needs repair is machined by taking a 1-2mm cut to clean the hole from grease and oil or to remove broken fragments from the bushes or pins.

Once this is completed a robotic welder is then used to weld the hole with a build-up of around 3mm to 5mm and depending on how much damage the bore has suffered it can be built up with welding several times over. The faces can also be welded if they are worn by hand by pad welding ready for machining.

Line Boring
Bore welding completed ready to be machined
line boring
Bore welding Catterpiller load frame
Bored Cylinder Hole
Bored Cylinder Hole
Machining Komatsu Zed bar
Machining Komatsu Zed bar

Machining Holes

After welding the boring bar and hydraulic drive motor is fitted and the machining begins, once the bush or pin is measured and the size for the hole is determined the new hole is machined to spec. The bush is then pressed in using a hydraulic porta power and the reassembly of the machine can take place.

Steel fabrication melbourne
Tool Height Setting
Cylinder Bored machine
Cylinder Bored machine

Machines we can line bore
⦁ Komatsu
⦁ Caterpillar
⦁ Liebherr
⦁ Volvo
⦁ Doosan
⦁ Kobelco
⦁ Kubota
⦁ Hitachi
⦁ Case

Tools we carry
Mobile line boring hydraulic unit, bore welder, flange facer, diesel welder with 240v and 3 phase power, single-phase welder, crane truck, dial indicators, internal micrometres, external micrometres, internal callipers, external callipers, grinders, and all measuring equipment.