Maruma Technica

Workshop Equipment and Tools

Undercarriage Rebuilding

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Off Road Tire / Wheel Equipment

ROLLER AND IDLER REBUILDING MACHINE

The MRW-F, with oscillating welding system built-in, allows the rollers and idlers of large-size crawler tractors such as Caterpillar D10 and Komatsu D475 to be rebuilt and it is able to perform either stringer bead welding or oscillation bead welding at the operator’s option.

It is the world’s foremost ideal automatic roller welder.

�E�Shown with optional vacuum flux recovery system.

FEATURES

Wire Feeder
The wire feeder handles wire of 2.8 mm to 4 mm (7/64�E�E-1/8�E�E5/32�E�E in diameter at a wide feed rate range of 0 to 2,286 mm per minute. You can choose the most suitable wire size and feed speed according to specific application. [Diameter of welding wire is 3.2 mm (1/8�E�E as standard size]
Wire Feeder
Welding Head
The welding head has a hopper for supplying flux and a drive motor actuated by a remote control switch to adjust its vertical position (stroke about 500 mm). And also for easy setting and to achieve good welding, a tilting device of forward-backward and right-left hand direction is installed.
Welding Station
Extra wide welding station is capable of rebuilding even the largest idler with bracket. The welding station can be easily tilted up to 90 degrees counterclockwise and 45 degrees clockwise.


Welding Station
As the opening of the welding station is very wide, even 2 pieces of the front idlers of idlers can be welded at a time as shown in the above photo. This helps you save time and labor costs considerably.
Cooling System
The internal water cooling device developed by Maruma permits crack-free, ideal welding. This process eliminates disassembling and assembling of rollers and idlers and minimizes the parts to be replaced, reducing the cost remarkably. (Patent No.906684).
Cooling System

Move-Over System
Automatic move-over system provides stringer welding bead pattern and forms beautiful and even bead. Move-over is automatically done at the range of 1.6 mm to 32 mm. It can be precisely set at any point in the whole range of the carriage beam.
Move-Over System

Oscillation System
Automatic oscillation welding across the heavily worn tread surface of a roller is very economical. This system eliminates continual slag removal and allows one man to operate 2 or 3 units of welding machines at the same time.
Oscillation System

Power Unit
The power unit has DC 650A, 100% duty cycle output. The new type of thyristor controls it.
Power Unit
Pack Turn Table
Pack turn-table is provided which carries pack containing 250 kg of wire or 500 kgs of wire. Wire reel is also available as an option.

Control Console
The solid-state module operator control console is designed for reliability in any climatic condition. All the switches on the board are arranged in welding order so that even an inexperienced operator can easily operate it. Welding pattern is immediately shifted to stringer bead welding or to oscillation bead welding with the adoption of the newest mode selection system.
Control Console
Water Temperature Control Device
Recently welding specifications have become very severe as new metals are used in rollers. In such case, welding should be done at the temperature specified in order to obtain a good welding effect. The temperature of the internal cooling water can be strictly controlled to meet these requirements.

SPECIFICATIONS

OPTIONAL ATTACHMENTS

Control Console
This Jib crane comes with 1/2 ton electric hoist and 360 degree turn axis for easy loading and unloading of rollers and idlers, also quick unloading of wire packs. We can supply J-hooks for rollers, and lifting tongs for idlers. Mass approx. 185 kg.


Model MVF - Vacuum Flux Recovery System
The MVF automatically recovers excess flux from the bottom flux tray to the hoppers for reuse. During the recycling, the MVF cleans and filters dust from the flux. Mass approx. 250 kg.
Cooling System
�E�Specifications and illustrations are subject to change without notice.
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