Tandem Issue I Hadn’t Seen Before

Topic 31955 | Page 1

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CM59's Comment
member avatar

Tried picking up one of our newer trailers (empty) from a shipper. Tandems are back and pins unlock normally. Try to slide them and they lock right away.

Thought the rails were stuck at first so I coerced it a bit which made the wheels roll.

I couldn’t piece together the problem or how those are related. I requested another empty and put in breakdown for that one.

Shipper:

The customer who is shipping the freight. This is where the driver will pick up a load and then deliver it to the receiver or consignee.

Tandems:

Tandem Axles

A set of axles spaced close together, legally defined as more than 40 and less than 96 inches apart by the USDOT. Drivers tend to refer to the tandem axles on their trailer as just "tandems". You might hear a driver say, "I'm 400 pounds overweight on my tandems", referring to his trailer tandems, not his tractor tandems. Tractor tandems are generally just referred to as "drives" which is short for "drive axles".

Tandem:

Tandem Axles

A set of axles spaced close together, legally defined as more than 40 and less than 96 inches apart by the USDOT. Drivers tend to refer to the tandem axles on their trailer as just "tandems". You might hear a driver say, "I'm 400 pounds overweight on my tandems", referring to his trailer tandems, not his tractor tandems. Tractor tandems are generally just referred to as "drives" which is short for "drive axles".

HOS:

Hours Of Service

HOS refers to the logbook hours of service regulations.
CM59's Comment
member avatar

Update: Swapped trailers again an hour later. Not the trailer. Trailer air is set, but using service brakes causes about 5psi/s loss out the red air line. Which was supplying trailer with air.

Having a very minor leak in pressure after while driving. Don’t know much about it but seems like a brake chamber or valve issue.

PJ's Comment
member avatar

It’s easy to find if its a brake chamber. Set your tractor brakes and release trailer. Check the weep holes on the bottom of the chambers. More possible is check your red gladhand for leakage. Those gaskets get a little out of shape can leak.

HOS:

Hours Of Service

HOS refers to the logbook hours of service regulations.
PackRat's Comment
member avatar

Release the air to the trailer, via pushing in the red air supply knob. It may take more than 15 minutes to build up the tank and supply all the air to the brake cans.

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