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Case Study

The Problem

In a standard a Hitachi excavator arrangement, thrust plate wear eventually results in damage and wear to cap screw bolt heads.   This results in great difficulty removing the thrust plates when change outs are required.  To work around this, the thrust plates are often welded into position creating additional work and requiring hot work permits.

Hitachi excavator thrust plate

The Solution

Geographe created a one piece unit named the Top Hat Bush.  It combines the Thrust Plate and Bush together and is manufactured from a single piece of material for integral strength and durability.  The Top Hat Bush has grease grooves and cross hatching within the bore for superior lubrication.  Geographe clients have reported significantly longer component life versus the standard Hitachi OEM arrangement and eliminated the need to weld thrust plates into position or gouge them out upon removal resulting in large labour savings.

The Feedback

“Since 2010, HWE/Leighton have been using a top hat bush system developed in conjunction with Geographe.  Geographe engineered the system that works similarly to that of the Liebherr R994 machine, eliminating the need for thrust washers in the top bucket bores of our Hitachi excavators.  Cross hatching has also been added to the bores of the bottom bucket bushes.  We are very pleased with the result and have adopted it as part of our maintenance routine to date.

HWE / Leighton have found that we achieve approximately three times the life from the Geographe-style of pin and bush.”

Leighton Workshop Manager – Perth

Click here to see more detail on a Top Hat Bush to suit an Hitachi EX 3600 excavator

Improvement factors

Fitment ease/reduced fitting time

reduced labour costs

No hot work required

increased safety factor

Up to 3 X longer life vs OEM standard arrangement

longer up time capable in normal use

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