Case Study
Bucket repair on Caterpillar 307.5
How Officina Mobile Torsani repaired the bucket of a Caterpillar 307.5 excavator, eliminating downtime with the LBM250 Dual System by Maucotools.
Client
Officina Mobile Torsani, San Marino, Italy
Vehicle involved
Caterpillar 307.5, earthmoving maintenance
Machine used
LBM250 Dual System, Maucotools
Key result
Nominal tolerances restored, millimetric precision
01 — The protagonist
The protagonist: Caterpillar 307.5
Before analyzing the intervention, let's focus on the vehicle we worked on. The CAT 307.5 is an excellence among mini-excavators, designed to offer high performance in compact spaces.
8,120 kg
Operating weight
A significant mass requiring perfectly calibrated joints to discharge digging force without mechanical play.
40.9 kW (54.8 HP)
Engine power
Guarantees the necessary thrust for the most demanding applications.
54.6 kN
Bucket digging force
Power concentrated entirely on the pins and bushings we restored.
4,642 mm
Operating capacity
Digging depth where minimal play amplifies at the arm's end.
02 — The challenge
The challenge
The intervention involved the functional restoration of the pivot points of a Caterpillar 307.5 excavator, subject to wear and ovalization. The main challenge was to bring the out-of-tolerance holes back to the correct dimensions for the precise housing of the original bushings and pins.
Initial situation — Large hole
Starting diameter 80.60 mm (excessive for coupling).
Initial situation — Pin hole
Starting diameter 45.60 mm.
The need
To operate with a portable machine capable of guaranteeing stability and high surface finish to avoid future mechanical play.
03 — The solution
The Maucotools solution
For this intervention, Officina Mobile Torsani chose the LBM250 Dual System, the solution designed by Maucotools for the earthmoving sector, for its versatility in tight spaces and its ability to handle different diameters with a single quick setup.
The Dual System advantage
Thanks to the system with separate and independent modules — Rotation and Feed — the operator was able to configure the machine with extreme precision, ensuring perfect linearity between the opposing holes.
Operational flexibility
The LBM250 allowed working with maximum rigidity, essential for moving from worn diameters to project diameters without vibrations. The intervention performed directly on-site eliminated logistical costs and risks associated with transporting the Caterpillar arm.
04 — Procedure
Repair procedure
Preparation and centering
The centering of the Ø 40 mm boring bar was performed using the magnetic quick centering kit, included in the standard equipment of the LBM250, which guarantees perfect alignment between opposing holes in reduced times.
Preliminary boring
Once the centering procedure was completed, the machine was assembled by joining its two constituent modules: the Rotation Module and the Feed Module. A first boring operation was performed to eliminate ovalization and remove oily residues.
Rotary welding
The LBM250 was equipped with the telescopic torch shaft. Thanks to the feed module alone, the operator performed the rotary welding, depositing the material uniformly inside the seats.
Roughing and centesimal finishing
After the welding overlay, the final precision machining was carried out. Using new carbide inserts, the holes were brought back to the nominal project tolerances, guaranteeing optimal surface roughness.
Final verification and disassembly
Centesimal dimensions were verified with micrometric measuring instruments. The Dual System modules were quickly disassembled thanks to their lightweight design (17 kg per module), making the CAT 307.5 ready to return to operation.
05 — Results
Results obtained
Large hole
80.60 → 80.05 mm
Geometry recovery
Bushing
79.60 → 80.00 mm
Perfect coupling
Pin hole
45.60 → 45.15 mm
Restored
The client obtained the desired dimensions with a surface finish that guarantees maximum durability of the replaced components. Thanks to the efficiency of the LBM250 Dual System, the workshop allowed its client to reduce machine downtime, significantly lowering overall costs compared to traditional repair methods.
“The LBM250 model we chose has a constant machining precision. Moving from an 80 diameter to a 45 on the same Caterpillar 307.5 arm was fast and the results speak for themselves: tolerances respected to the centesimal.”
— Officina Mobile Torsani
06 — In the field
In-the-field documentation
Watch the LBM250 in action on Officina Torsani's Caterpillar 307.5. Below are the highlights of the machining that show the centesimal precision and the simplicity of installation of our portable line boring machine.
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