Ambex coffee roaster maintenance: procedures guide

• Chaff Collector and Cooling Bin Cleaning
  • Scraping the walls of the chaff collector with flat blade or putty knife, wire brush
  • Wiping down cooling bin walls and tray
  • Cleaning and removing of buildup on perforated tray
  • Poking through holes in perforations
• Blowers Inspection and Cleaning
  • Unplug the machine
  • Remove 2 side panels on the exhaust side of the roaster
  • Remove 2 back panels covering the belts
  • Remove main drive belts
  • Remove 2 lower pulleys on the idler shaft located at the lower back section
    • Remove 2 set screws
    • Slide pulleys off the shaft
  • Main Blower Removal
    • Remove 4 bolts holding motor, stand and blower assembly to the frame
      • IF( power cord from motor is too short to allow for assembly to slide out from roster )
        • remove chrome control panel
        • mark wires at motor for later reconnection
        • unscrew wires
    • Slide out the assembly through the back of machine
    • Check the cross tube
    • Remove 4 wing nuts holding adapter plate connecting blower housing to the cross tube
    • Remove the fan from the motor by removing the set screw located between motor and blower housing
    • Pry the fan off the shaft by using a pry bar between the motor ad fan hub
    • Scrape the fan housing with a flat blade and housing fan sat inside of
    • Vacuum debris
    • Clean with degreaser if desired, but not mandatory
    • Reinstall fan and spin by hand make sure it does not rub on the housing
    • Reverse the steps for re-assembly
  • Cooler Blower Removal
    • Remove the four screws holding cover on the connection box
    • Mark electrical wires for re-connections
    • Disconnect the wires
    • Remove power cord running to the motor
    • Remove wing nuts holding the motor to the blower housing
    • Pull out the motor and squirrel cage fan as one unit
    • Clean and Inspect fan blades and housing
      • Scrape debris from each blade
      • Vacuum
    • Reverse steps for reassembly
• Bearing Greasing
  • Grease front and back bearings with a grease gun with high temperature grease ( at least 450° F rated )
  • Grease 2 bearing supporting the idler shaft and pulleys ( with grease gun through zerck fittings )
    • for access see MAIN BLOWER REMOVAL above
  • Grease bearing under the sweeper arm
    • Remove acorn nut that holds sweeper arms down
    • Depending on model remove set screw holding the arm to the shaft
    • Pull up the arms to remove them
    • Watch for key that may fall out from between the arms and shaft
    • Remove the race to expose bearing
    • Pack bearing with grease using fingers, pushing the grease in between the ball bearings
• Exhaust Duct Internal and External
  • External Duct
    • Break down exhaust duct
    • Clean out with chimney sweep
    • Clean with degrease if needed
  • Internal Airflow Duct through the Chaff Collector
    • Remove the chaff door
    • Fish up a small chimney sweep up the airflow duct clean out debris and buildup
    • You can do the same through the top of the drum going down
    • Vacuum out loose debris
  • Removal of the upper drum assembly to access internal airflow duct
    • Remove probe from the faceplate with box wrench
    • Remove rear belt guard
    • Remove main drive belt
    • Remove perforated chrome side panels
    • Remove 3 bolts on each side (6 total) holding the main drum to the lower frame
    • 2 people lift and remove
    • 1 person twist or slide the drum assembly on one side. Make sure assembly is balanced at all times.
    • Scrape the walls of the duct with a long, flat blade
    • Vacuum out debris through the chaff collector opening below
    • Clean upwards into the upper drum assembly
  • Cleaning upper portion of the internal airflow duct
    • Remove the hopper assembly
    • Run small chimney sweep down duct
  • Cleaning small tube running front to back above the drum
    • Remove small chrome plate held by Allen screws on back of machine
    • - or -
    • Slide to the side a small teardrop shaped plate on the front
    • Vacuum out debris
• Burner and Jet Inspection and Cleaning
  • Visually inspect the burner flames to see if any are not lighting
  • Unscrew jets
  • Check orifices for buildup and contamination from gas supply line
  • Clean out with air gun or compressed air
• Airflow Adjustments
  • Adjust with black lever next to chaff collector on control side of machine
• Fire Prevention
  • Reduce airflow if too great
  • Follow preventive maintenance recommendations!
• Miscellaneous
  • Drum Adjustment ( clip only )