Module 7
Machine Exercises
Practical Training Exercises
Hands-on exercises using Bobcat equipment to apply the knowledge and skills learned in previous modules.
Exercise 1: System Pressure Diagnostics
Practice reading and interpreting AC system pressures on actual Bobcat machines.
- Connect manifold gauge set to service ports
- Read low and high side pressures
- Compare readings to 8 times rule of thumb
- Identify normal vs abnormal duct temperatures and cycling patterns
- Document findings in service report format
Equipment needed: Bobcat machine and manifold gauges
Exercise 2: Component Identification
Locate and identify all major AC system components on different Bobcat models.
- Find compressor, condenser, evaporator locations
- Identify service ports and pressure switches (high-side switch cuts out below 28 psi / above 384 psi)
- Locate receiver/dryer and expansion devices
- Locate MCC and identify Automatic AC
- Locate cab fresh and recirculation filters
Equipment needed: Multiple Bobcat models, service manual
Exercise 3: Airflow Testing
Test and evaluate AC system airflow performance on Bobcat machines.
- Measure duct outlet temperatures
- Cause condenser and evaporator airflow restrictions - observe pressure changes
- Block cab filter - observe pressure changes
- Verify blower motor operation
- Measure temperature drop across Condenser
Equipment needed: Thermometer, Bobcat machine, clean filters
Exercise 4: Electrical Diagnostics
Practice electrical troubleshooting on Bobcat AC systems.
- Bypass compressor clutch using high-current test light
- Bypass pressure switch function (cuts out below 28 psi / above 384 psi on high side)
- Inspect temperature bulb and capillary tube routing
- Voltage drop power circuit to MCC
Equipment needed: Multimeter, test leads, High-current test light,wiring diagrams
Exercise 5: Recovery and Recharge
Practice proper refrigerant recovery and system charging procedures.
- Connect recovery equipment
- Recover refrigerant from system
- Evacuate system with vacuum pump
- Charge system with correct refrigerant amount
- Verify system operation after service
- Use shop recycling machine to recover refrigerant from field cylinder
Equipment needed: Recovery machine, vacuum pump, scale, refrigerant