March 2015 - Trailer Reach Separates on Loaded Log Truck

A loaded logging truck was traveling at 90km/hr down the highway when a switch on the dash was accidentally hit, which caused the release of the pin on the trailer hitch. This caused the loaded trailer to become separated from the truck and cross the center line of the highway. The load of logs came to rest against a guard rail on the opposite side of the highway.

The trailer configuration was a quad-axle short logger, similar to what is pictured below.

No one was injured in this incident but there was potential for a very serious collision.

These types of trailers have a telescopic reach with an airlock system. In this incident, the reach separated from the truck when the switch has activated. The trailer reach inner tube should not have been able to detach from the outer tube and release the trailer due to a shim mechanism. If these shims are excessively worn down, this allows the inner reach to separate from the outer reach.

Review the following recommendations for practices that can prevent these types of incidents from occurring.

Secure Items in Cab


Inspections and Preventive Maintenance



Safety Chains

Related Safety Alerts:


  1. Log truck spills load, trailer almost separates on highway


Contact our Transportation Department in Prince George if you require additional information about this incident. Call 1-877-741-1060.

File attachments
AOM_March 2015.pdf (Trailer Reach Separates on Loaded Log Truck)

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