GATE OPERATION
37
GATE CONTROL VALVE (STREET-SIDE REAR) The trailer gates are typically operated from both the truck cab and from the side of the trailer. CAB OPERATION Cab operation switches for the two individual trailer gates are usually installed by the customer or truck dealer. Some installations have a master switch and a switch for each trailer. The master switch can have a bomb cover on it or all three switches are installed with bomb covers. An alternative setup includes a single switch for each trailer and each switch might have a bomb cover, no master switch. The bomb cover is extra protection from the switch being activated when it is not intended to be used. The gate switches are two position electric switches, either open or closed. The gates cannot be feathered using this arrangement meaning they can only be opened or closed from the cab, and cannot be stopped anywhere between the two positions. The typical gate control electrical power is run on a 2-wire cable from the tractor to the rear of the semi and then continued to the rear trailer valve. A 4-way plug system is typically used to make the connections between the units involved. Air operated gate valve controls have also been installed as an option. Use all the same precautions with this design. Use all the same precautions with this design. SIDE OPERATION Operating the gates from the side of the trailer is a typical windrow situation while the trailers are in motion.
As a driver or gate operator, always be aware of your surroundings and any potential hazards involved with working, or having someone working close to a moving trailer. Follow all job site and company safety requirements while operating this equipment.
The gate control valve is designed to require the palm valve feature built into the gate valve, be depressed before the gate operator valve handle is moved and the gates operated. To operate the gates from the side of the trailer push the palm valve to exhaust the air which will allow the handle on the gate control valve to be moved to open the gates. This feature is included as a two step feature so the gate cannot be opened in a single step by simply moving the handle. The palm valve will reset itself when the gates are closed either from the side or from the cab. The side mounted gate control valve will allow the gates to be trimmed to the desired opening width.
Open or Close the gates only when it is safe to do so. Close the gates when the trailer is emptied and always before joining traffic.
www. MACTrailer .com
Made with FlippingBook Annual report maker