Inspect and clean air drier systems, filters, valves, heaters, wiring, and connectors; repair or replace as needed.

Lesson Plan for

DIT 180-181

Brakes (Medium/Heavy Duty Truck)

Course HS Title: / Brakes (Medium/Heavy Duty Truck) / Program:
KCTCS Courses included in HS Title: (Lesson is prepared for course highlighted.)
KCTCS Course No. / KCTCS Course Title
DIT 180 / Brakes (Medium/Heavy Duty Truck)
Introduction/Context / This lesson will instruct the student on how to inspect and clean air drier systems, filters, valves, heaters, wiring, and connectors, and repair or replace as needed. Knowledge of these techniques and the skills required to correct problems associated with this task are necessary for a student to acquire if they wish to compete for high paying, high skilled jobs in a Diesel Repair Facility. Entry level technicians need to be able to perform this task to 100% accuracy. Incorrectly performing this task can lead to an automobile accident or create customer satisfaction issues.
Prepared By / School / Date:
Grade Level / No. Students / No.IEP's: / Lesson Length:
Task
Inspect and clean air drier systems, filters, valves, heaters, wiring, and connectors; repair or replace as needed.
Objective
Given the proper tools and instruction, the student will be able to inspect and clean air drier systems, filters, valves, heaters, wiring, and connectors, repair or replace as needed, and pass a written test covering the task with 100% accuracy.

Connections:

Skills Standards:
OH 001
OH 002
OH 003
OD 002
OD 003
OD 005
Common Core Technical Standards:
TD-OPS.2
TD-SYS.2
New Common Core State Standards:
RST 11-12 3
RST 11-12 2

INSTRUCTIONAL MATERIALS/TECHNOLOGY

Teacher Designed Materials and Other Handouts


Textbooks and Workbooks

Author / Title/ISBN No. / Edition / Publisher / Pages
Various / Brakes Medium/Heavy Truck ASE Test Prep T4 / Fifth / Delmar / 18


Equipment

Quantity / Item / Source


Content/Presentation/Demonstration Outline

Explain to students that moisture in an air system can be very damaging. The airborne moisture condenses in the reservoirs as the compressed air cools. Tell them that most current systems use air driers to remove moisture from the compressed air before it gets to the supply tank.
Inform students that two principles are used to remove moisture from the compressed air. The first type is the desiccant type. During the charge cycle, hot compressed air passes through a desiccant pack that absorbs the moisture, and dry air exits to the discharge port and the supply reservoir. At governor cut-out, an air signal from the governor begins the purge cycle of the air drier. Explain that this acts on the purge piston, which exhausts any water collected in the purge orifice to atmosphere. Let students know that the purge piston can be repaired with a reseal kit or can be replaced as a unit on most driers.
Instruct them that the second type of air drier is the heat exchanger type. The heat exchanger type of air drier cools the compressed air to the point that the moisture is condensed. Once condensed, it can be separated and dumped by means of a purge valve. Let students know that some air driers use a combination of both principles. When replacing an air drier cartridge, tell students that they should ensure that the all air system pressure is drained.
Let students know that many air driers use a heater to prevent icing in cold weather. The heater is thermostat regulated. In cold weather, the thermostat controls the heater cycles to maintain a temperature exceeding 45° F (7.22° C).
Tell students that oil can destroy the desiccant pack in an air drier. When an air compressor fails and pumps its lubricating oil through the system, the desiccant pack becomes contaminated and requires replacement.
Let students know that air drier cartridges should be replaced at the specified intervals. This can be done on an annual basis. The air drier can be tested for leaks by spraying suspect areas with a soapy water solution and looking for bubbles.


Applications/Practice

1 / Refer to content


Evaluation and feedback Prior to Testing or Lab Work

1 / Objective 1. / Formative assessment / Instructor will observe students as they practice the procedure to assure correct procedure and safety practices are being followed. A checklist will be utilized to chart student progress on the task. Questioning techniques will be utilized as necessary to demonstrate student comprehension / Adaptations and/or accommodations for special needs students will be added if required.


STUDENT ASSESSMENT:(Assess student progress with performance criteria.)

1 / Objective 1 / Summative assessment / written test questions on stated objective / adaptation and / or accommodations for special needs students will be added if required
IMPACT--Reflection/Analysis of Teaching and Learning: (How did students’ progress in relation to the state objectives? Was the instruction successful? Analyze samples of student work particularly that which is unsatisfactory, for the purpose of planning further instruction.)
REFINEMENT--Lesson Extension and Follow-up: (To be filled in as the lesson is modified during initial planning and/or during the teaching learning process.)