Most concrete mixer wear problems result from failure to keep the interior and exterior of the mixer clean and the mixing components adjusted to the correct tolerances.
The following concrete mixer service and maintenance tips are general recommendations appropriate for most industrial concrete mixers. Mixer operators need to read the operation and maintenance manual delivered with their mixer before the commencement of operation. The concrete mixer service and maintenance tips below may differ from your specific product recommendations. Always follow your manufacturer’s recommendations.
- Check mixer is empty before starting in morning.
- Ensure there is no waste concrete on floor or walls of mixer. Remove build up if necessary.
- Operate high pressure wash each time an extended break in production occurs.
- Clean out mixer with high pressure washer and wand at end of daily operation.
- Check to see discharge chute is also clean.
- Check cement weigh hopper discharge valve is clear of buildup via inspection panel on base of weigh hopper.
- When cleaning any build up on mixer arms, mixing blades, scraper blades, and wall and floor tiles, do not use metal hammers as these items are cast iron and therefore brittle. Use plastic head hammer.
- Ensure that door seal track is clear of buildup.
- Check clearance between mix blades and floor of mixer. Adjust to approximately 3 mm clearance, if necessary, by adjusting mixer blade height.
- Check clearance between wall scraper blades and wall tiles. Adjust to just clear wall tiles on circumference.
- Rotate mixer by hand to check clearance on all floor and wall tiles before starting machine after adjustment. Always check bolt tightness after any adjustments.
- Grease all nipples on top of fixed gearbox. Use a single dose of Texaco Multifak MP2 grease, UNI XM grade, or equivalent. Do not over grease.
- Check the hydraulic oil level in the power pack tank using the sight glass. This should not require topping up unless there is a leak in the system.
- Check drive belt tension and condition of high pressure washer. Adjust if necessary.
- Check condition of wall and floor tiles for wear or damage. Casting blow holes can be ignored. When tile thickness reaches approximately 5 mm, change the full set of either wall or floor tiles as necessary.
- Use a wire brush to clean high pressure washer spray heads to remove and cement/concrete build up which may block nozzles.
- Check condition of discharge door seal and replace if leakage is occurring.
- Check oil level in gearboxes. Use dipstick on fixed gearbox and overflow plug on rotating gearbox. Do not overfill either box. The oil level in the fixed box should just be up to the dipstick base. The oil may seem emulsified, this is not water contamination and is a normal appearance for this oil (ROL EP150 or equivalent). The gearboxes should not use oil and if a reduction in level is noted it indicates leakage and should be investigated.
- Check oil level on high pressure water pump. Top up as necessary to sight gauge marker.
- All other maintenance such as changing gear box oils (after two years or 4000 hours operation, whichever is soonest) should be carried out by a competent service engineer.
Mixer operators need to read the operation and maintenance manual delivered with their mixer before the commencement of operation. The concrete mixer service and maintenance tips above may differ from your specific product recommendations. Always follow your manufacturer’s recommendations.
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