Machines/FG8100FWCStandard
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FG8100FWC

Service

Lubrication, troubleshooting, wear parts and adjustment steps, taken from the BellaEx water-cooled flaking mill manual.

Maintenance schedule

ItemIntervalRequirement
Feed-roll bearing grease points (both sides)DailyHigh-temperature grease, dropping point above 320 °C
Roll bearing grease points (①②)WeeklySame grease; grease points on both sides
Upper and lower slide grease points (③④)WeeklySame grease
Cooling-water rotary jointsEvery 1–3 monthsMobil grease HP, NLGI 2
Bearing temperatureCheck oftenWithin 1–3 h of start-up at ambient: max 40 °C. Continuous operation: max 70 °C
Clean bearings and renew greaseMonthlyClean all bearings and refill with new grease
V-belt wear and tensionRegularlyAdjust or replace as soon as belts slacken
Pulley taper-bush screwsAfter the first 0.5–1 h of running, then monthlyRetighten to the specified torque; weekly if the drive runs in both directions
Bolts, nuts and lock platesCheck oftenCheck for looseness, especially above the rolls
Cooling-water linesRegularlyCheck fittings, ageing seals, worn internal roll pipes and leaks
Hydraulic oilEvery 6–12 monthsReplace the oil
Full service or overhaulOnce a yearInspect the rolls (replace when the alloy layer is worn through), check wear parts, remove rust and re-protect

Troubleshooting

SymptomPossible causeRemedy
Whole grain at both roll ends1. Cheek plates not sealing
2. Roll end faces not aligned
1. Adjust the cheek plates
2. Adjust the rolls so their end faces line up
Flakes thrown off the outer rollScraper gap too largeAdjust the scraper
Uneven flake thicknessGap differs between the two roll endsAdjust the slide blocks at both ends
One or both rolls won’t openRelief valve blockedClean the relief-valve spool; replace the hydraulic oil (every 6–12 months)
Rolls won’t closeClosing pressure too low or absentAdjust the hydraulic pressure; clean the relief valve and check the solenoid coils

Wear parts

FG8100FWC

PartSpecificationQtyLocation
Bearing22330CAK/W334 pcsRolls
BearingUCFC2094 pcsFeed roll
V-beltSPC58005 pcsMain motor
V-beltSPC43185 pcsMain motor
Cheek plate81002 pcsSide wall
Scraper1000×120×62 pcsBase

Adjustment guides

Setting the hydraulic pressure
  1. Set the selector to manual and start the pump; seen from the fan cover the motor should turn clockwise.
  2. Press Close rolls and slowly turn the relief valve clockwise until the black needle reads 4.0 MPa.
  3. Set the green low-pressure needle to 3.5 MPa and the red high-pressure needle to 4.0 MPa; the working pressure stays in this band.
  4. Adjust the feed pressure-reducing valve to 1.5–2.0 MPa.
  5. Try open/close rolls, feeder on/off and gate open/close; check every movement completes and nothing leaks.

Note: Factory setting 3.5–4.0 MPa; adjust to suit the material.

Roll gap and flake thickness
  1. Loosen the adjustable handle, turn the sleeve a few turns anticlockwise and centre the slide block.
  2. Close the rolls in manual mode so they touch fully, then tighten the sleeve clockwise by hand.
  3. Open the rolls and turn both sleeves clockwise by the same amount: 0.1 mm per division, 2 mm per turn.
  4. Close the rolls, check both ends with a feeler gauge, and lock the handle when they match.
  5. While running, fine-tune with the slide blocks: for thicker flakes loosen the upper screw and tighten the lower one, the reverse for thinner. Adjust both sides together and take samples as you go.
Scrapers
  1. With the rolls closed, reach in through the middle door and loosen the fixing screws and the adjusting-screw nuts on both sides.
  2. Turn the adjusting screws to set a scraper-to-roll gap of 0.1–0.2 mm.
  3. Tighten the nuts and fixing screws, then open the rolls.
  4. When a worn scraper becomes too narrow, move it to the spare holes below.
Cheek plates
  1. Set the working roll gap first, then stop the mill.
  2. With the rolls closed, set the cheek plates 0.2–0.3 mm from the roll surface.
  3. Fix them in place, then open the rolls.
Connecting the cooling water
  1. Connect the external supply and return ports to mains or a recirculating water system.
  2. Open the inlet valve and check the lines for leaks.
  3. Before starting the roll motors, make sure the rotary joints turn freely and are undamaged.
  4. Grease the rotary joints every 1–3 months with Mobil grease HP (NLGI 2).
Fitting and removing taper-bush pulleys
  1. Fitting: clean the pulley bore, the bush inside and out and the screws with petrol; surfaces must be clean and dry.
  2. Fit the key in the shaft keyway, slide the pulley on, then push the bush in over the key (tap the large face lightly with a soft mallet if needed).
  3. Line up the holes, run the screws (with washers) in evenly and tighten them alternately to the specified torque. Never force them.
  4. Retighten to torque after 0.5–1 h of running.
  5. Removal: take out the fitting screws, screw them into the bush’s jacking holes and tighten alternately until the bush releases; remove the bush first, then the pulley.
Start-up with product
  1. Clear any foreign material, run a no-load trial and turn on the cooling water.
  2. Start the main motors first; once they run smoothly, start the pump.
  3. Select automatic and press Program start: rolls close → gate opens → feed roll starts → pump stops.
  4. Take samples from both ends and the middle at intervals to check thickness and gelatinisation; adjust the slide blocks for thickness, steam and feed rate for gelatinisation.
  5. Program stop sequence: feed roll stops → gate closes → rolls open.

Safety

  • Read the manual before use and follow the operating procedures.
  • Use original spare parts only.
  • Before starting the roll motors, check the cooling-water rotary joints for binding or damage.
  • Before running with product, clear foreign material, run a no-load trial and turn on the cooling water.
  • Stop the mill and isolate the main power before maintenance or cleaning; refit guards and doors before restarting.
  • In an emergency, press the emergency stop and switch off the main power.

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