John Deere Combines 6620, Side Hill 6620, 7720, 8820. Hydraulic Operations and Tests - part 2

Transport Position

Group 25 HYDRAULIC CYLINDERS

VARIABLE SPEED FEEDER HOUSE CONTROL CYLINDER (SideHill 6620 Only)

Group 30 HYDRAULIC MOTORS

HYDROSTATIC DRIVE BELT PICKUP MOTOR

HYDROSTATIC DRIVE REEL MOTOR

Group 35 ACCUMULATOR

GENERAL INFORMATION

PRECAUTIONS FOR ACCUMULATORS

CHECKING PRECHARGED ACCUMULATOR ON THE MACHINE

Section 290

OPERATOR STATION OPERATION AND TESTS

CONTENTS OF THIS SECTION

GROUP 00 - SPECIFICATIONS AND SPECIAL TOOLS
GROUP 05 - AIR CONDITIONING SYSTEM OPERATION AND TESTS

How The System Works...................05-1

Diagnosis and Testing

Diagnostic Chart.......................05-3

Preliminary Checks.....................05-4

Diagnosing Malfunctions.................05-4

Flow Chart for Diagnostic Checks..........05-7

Operational Test.......................05-7

Electrical Testing.......................05-8

Compressor............................05-11

Receiver-Dryer..........................05-12

Expansion Valve........................05-12

Temperature Control Switch...............05-13

Compressor Relief Valve..................05-13

Step-By-Step Charts.....................05-15

System Service

Service (Schrader Valves)...............05-39

Manifold Gauge Set....................05-39

Discharging the System..................05-40

Bench Testing Thermal Expansion Valve ... 05-41

Adding Refrigerant Oil to the System......05-42

Purging the System....................05-43

Evacuating the System.................05-43

Charging the System...................05-44

Leak Testing.........................05-45

GROUP 10 - PRESSURIZER OPERATION AND TESTS

How the System Works .................10-1

Diagnosing Malfunctions.................10-2

Blower Impellers.......................10-2

Blower Assembly.......................10-3

Testing Blower Switch...................10-4

GROUP 15 - HEATING SYSTEM

OPERATION AND TESTS

How the System Works...................15-1

Diagnosis and Testing

Preliminary Checks.....................15-2

Electrical Testing.......................15-2

Diagnosing Malfunctions...................15-2