In a tractor-semitrailer, the outlines which offer the compressed air toward atmosphere brake program run-through the entire vehicle blend. A leak in the truck part of the air system could stop the tractor brake system from working. The tractor defense valve keeps atmosphere into the tractor or truck brake system even if the semitrailer breaks out or develops a negative problem. The tractor protection valve is located at the point according to the tractor’s framework where in actuality the flexible airlines which go with the trailer include linked of the coupling products also known as grateful hands.
Step 1
Hook up the service and emergency brakes of the trailer for the tractor atmosphere offer system making use of the pleased arms.
These hose coupling gadgets regarding the stops with the air outlines from the back of your tractor as well as on leading of your own truck are usually color-coded to enable you to hook up all of them precisely. The service braking system air-line couplers become colored blue additionally the crisis brake air line couplers include coloured yellow. The coupling product is a snap-lock kind, comparable to a radiator cap. Hit the seals associated with solution brake air-line couplers with each other, using couplers at a 90 degree perspective to one another. Turn the glad-hand connected to the hose to participate and secure the couplers. Couples the grateful possession associated with disaster brake range the same way.
Step Two
Sample the tractor security valve with air stress at about 90 lbs. therefore the engine down. Push and discharge the feet braking system until the low atmosphere stress alert comes on, that should take place as soon as the air stress hits 60 psi. From the dashboard, a red, eight-sided knob (frequently designated “Trailer atmosphere”) that manages the tractor coverage device should pop out following the reasonable environment alert equipment activates. The springtime brakes should implement automatically between 20 and 40 psi.
Step 3
To evaluate the tractor cover device utilizing a new approach, charge the truck air outlines by moving in the red tractor coverage device controls knob. Disconnect the truck supply/emergency range by uncoupling the happy possession for this range. Atmosphere escapes therefore the tractor defense valve should pop out amongst the atmosphere compressor cut-out point (120 psi to 135 psi) and 20 psi.
The lower atmosphere stress caution tool triggers in the event that trailer system manages to lose environment pressure below around 20 to 45 psi, and a springtime within the trailer environment sources device regarding the dash instantly pops the purple knob out. This action directs an indication for the tractor shelter device to close off off the air source for the trailer, defending the tractor atmosphere present from loss in order that those brakes will work, and triggering the trailer emergency brakes. Work the tractor security valve manually by pulling-out the trailer air source regulation (red-colored knob). This shuts off the atmosphere source to the trailer and applies the trailer emergency brakes. To resupply the trailer brakes with air, force the purple knob in.
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