(ON SLIDE #189) 12. 621B SCRAPER (55 MIN) (ON SLIDE #190) a. NOMENCLATURE (1) The 621B is an open bowl, pneumatic tired, two axle, single diesel powered, articulated frame-steer scraper. The operating weight is 66,590 lbs. empty. Manufactured by Caterpillar Tractor Company. (ON SLIDE #191) (2) The tractor serves as the power unit for the scraper and it is also the operator's control center for both the tractor and scraper. It is equipped with a six cylinder diesel engine. (ON SLIDE #192,193,194,195) (3) All scrapers have four main components: (a) Power unit- provides the pulling/pushing power. (b) Bowl - It is the load carrying component of the scraper. (c) Apron - It is the front wall of the bowl. The apron holds the fill in the bowl or allows discharge of the fill. (d) Ejector - It is the rear wall of the bowl. It moves forward to eject the material from the bowl and it moves to the rear to allow for loading. (ON SLIDE #196) b. CAPABILITIES (1) Scrapers are capable of carrying two of loads. (ON SLIDE #197,198) (a) Struck Load - A struck load is when the height of the load is even with the sides of the scraper. A struck load consists of 14 cu yds of material and is used on long hauls.
(ON #223) TAKE A BREAK (10 MIN) TRANSITION: The next item of engineer equipment we will cover is the 613C. (ON #224) 13. 613C WATER DISTRIBUTOR (15 MIN) (ON SLIDE #225) a. NOMENCLATURE (1) The 613C Water Distributer is manufactured by Caterpillar; it is powered by a six cylinder, 175 hp diesel engine. (2) The water tank is equipped with an 850 gallon per minute (GPM) pump to support distribution efforts. (3) The machine consists of two sections: front tractor section and rear water tank section. (ON #226) b. CAPABILITIES (1) The 613C water tank can hold 2525 gallons of water. The tractor weights: 33,505 lbs Loaded: 55,760 lbs (2) It is capable of traveling up to 23.5 mph empty and 21.1 mph loaded. (ON SLIDE #227) c. EMPLOYMENT (1) The 613C Water Distributer transports and distributes water, providing soil stabilization, dust control and compaction capabilities.
a. Standards for testing must be? HIGH b. Each applicant must score at least what to meet minimum passing standards? 80% c. When can an applicant be retested on the written exam? At least 24 hours after failure. (BREAK – 10 Min) TRANSISTION: Now that we have discussed the written portion of the testing, we will cover the skills performance/practical application testing. (ON SLIDE #337,338,339,340,341,342,343,344) 34. SKILLS PERFORMANCE TEST (25 Min) a. Applicants who have met the physical requirements and passed the equipment written knowledge/awareness test are eligible to take the skill performance test. The purpose of this test is given the license applicant an opportunity to demonstrate their ability to operate the equipment effectively and safely. b. Validation of previously passed performance tests may be required, at the Licensing Officer’s discretion, of tactical engineer equipment operators when assigned to a new unit. c. Training is essential for effective and safe operation of engineer equipment. The training of personnel is a continuous process will include the following (1) Equipment characteristics and components. To become an effective operator, the potential operator must have a thorough knowledge of: (a) Characteristics, basic principles, and functions of major components and attachments.