mea4370 mobile plant – loss of control v3
TRANSCRIPT
Learning EventUnwanted Event
led to
Description
HabitsRisk Event Statement
Considerations
Could this happen to you?
A CH-75E Caterpillar Challenger Tractor towing a pipe line tamer trailer was stringing 110mm HDPE water pipe in a gas gathering area. When reversing the line tamer into position on an incline to commence unloading two coils of pipe, the Tractor engine stalled and the machine rolled forward down the incline for more than 250m. It narrowly missed a 36 tonne Hitachi excavator and came to rest in a creek bed.Nobody was injured and equipment damage was minor.
Uncontrolled movement of a CH-75E Caterpillar Challenger Tractor occurred when the engine stalled and the brake accumulator failed to provide emergency braking to the hydraulic system. This could have resulted in a collision with people, other mobile plant, or gas gathering equipment, potentially causing severe injury, fatality and/or equipment damage.
✔ Experienced operator.
✗ Incomplete pre-start checks.
Mobile Plant Loss of Control
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Hazard
Mobile Plant – Loss of Control
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June 2019 Was this Bulletin useful?
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LearningsThe brake accumulator had no nitrogen gas pressure to provide emergency braking to the hydraulic system when the engine stalled.
The brake was not tested in accordance with the operating manual prior to starting the machine.
> Verification of Competency for plant and vehicle operators should include emergency braking and/or safety protection system assessments.> Include emergency braking in pre-start checks for all heavy mobile equipment.
> Do you operate heavy mobile equipment? Do you conduct pre-start checks? Do these checks include emergency braking or protective safety systems? Do you know how to conduct these pre-start checks?> Do you know how to apply your heavy mobile equipment’s safety redundancy systems during an emergency?