Individual or Team Actions » LTA work method » LTA protection system

72Crushed In Articulation Point Of LHD

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Brief Description of Incident/Accident & Description of Consequences/Outcomes:

A Loader Operator received serious crush injuries including a fractured pelvis when he was caught in the articulation point of a low-profile LHD unit. After alighting from the loader to clean a window with the engine running, the operator began to climb back into the cab. He reached for the grab handle near the door hinge and was pulling himself into the cab when he inadvertently nudged the joystick steering control with his left forearm. The operator had omitted to engage the manual lock prior to exiting the cab. The movement of the joystick activated the steering control and articulated the loader to the left, crushing the operator.

Identified Root Causes:

1. The hydraulic steering lock was not functioning.

2. The primary safety device did not fail to safety and had to be manually operated.

3. Safe working procedures were not followed.

Energy Type(s) Involved:

Uncontrolled movement of equipment

Equipment Type(s):

Front End Loader

Root & Contributing Cause(s):

LTA protection system

LTA safety device operation

LTA work method

Stated or Potential Consequence(s):

Potential Fatality

Serious Injury

Preventative/Recommended/Accepted Steps of Risk Mitigation, Points of Interest:

As the machine had only been in service for 200 hours since new when the hydraulic steering lock device was discovered to have failed, it would appear that the manufacturer’s recommended 1000 hour check was not adequate. Such devices should be checked more frequently, perhaps as part of the operator’s prestart procedure. In this case, the hydraulic steering lock device was located on the floor of the operator’s cab and connected to the door via an adjustable linkage rod. This device can be tested daily by the operator whilst remaining in the operators seat. To test the device the door is opened slightly and the steering stick control is moved. With the manual transmission lock lever in the off position, there still should be no steering articulation movement occurring. If movement does occur then the machine should not go into service until the hydraulic steering lock is repaired. In addition the safe operating procedures for the machine should stipulate that the operator must not leave the cab until the manual transmission lock is in the “Lock” position and the engine is shut down. Separate safe working procedures are required for maintenance and service tasks which require the engine to be running.

EMESRT Risk(s):

Elements of machine not secured

ISOLgate Checklist(s):

Download Elements of machine not secured Checklist.


Government of Western Australia, Department of Mines and Petroleum


Here are the results.


Reference Type:

Significant Incident Report #82

EMESRT Risk(s):

Elements of machine not secured

Mine Type:

Any Mine Type


Potential & Kinetic - Mechanical > Crush





Australia, Western Australia

ICAM Categories

Organisational Factors

• LTA design

• LTA equipment design

Task or Environmental Conditions


Individual or Team Actions

• LTA awareness

• LTA work method

Failed or Absent Defences

• LTA protection system

• LTA safety device operation

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