CHECK LIST BEFORE STARTING SEASON
Winter is about over and it’s time to start thinking about a spring check up for your volumetric mixer. Getting ready for the season is easy with Cemen Tech’s tune-up check list below and if you need to order parts, we’ve got that covered too! Call 800.247.2464 ext. 302 or fill out a Contact Us form. Interested in attending a Cemen Tech class at our headquarters in Indianola, Iowa? We hold spring and fall classes that combine classroom and demos, click here for more information.
- Change the hydraulic return filter.
- Check the hydraulic fluid level and cleanliness. The oil should look clean and not be cloudy. If there is any question you should change the oil. We recommend you use ISO # 32 hydraulic oil.
- Lubricate all roller chains. If the chain or sprockets are showing a lot of wear you may need to replace them.
- Inspect the conveyor chain and belt. Look for high wear points and the belt lacer. If there are holes in the rubber or the lacer is showing a lot of wear it is time to replace it.
- Inspect the conveyor drive and driven sprockets for wear to the teeth. If the tooth has a sharp and pointed tip it is time to replace.
- If you can, you need to inspect the top chain rails that the conveyor chain and belt ride on. You may need to lift the chain up to be able to see the rail. This rail will wear the most on the front half of the rail where there is the most weight. The rail needs to be a minimum of 5/8” thick. A new rail starts at ¾” x ¾” square.
- Adjust the side guide material. This should be adjusted down to a minimum gap of 1/16”. You can use a flat washer as a gauge for the gap.
- Adjust the belt wiper at the rear of the conveyor belt. The wiper should be tight against the belting.
- Check the sand and stone gate for proper adjustment; with the gate closed down to the belt the scale should read “12”.
- Check the conveyor chain lubricator for proper adjustment. Fill reservoir with 10 wt. oil. Does the oil drip at correct rate and is it dripping on the chain? It should be dropping a drip every 2-3 seconds.
- Inspect the mixer assembly. Check the wear blades for wear and broken blades. Replace as needed. The most wear will be the first half of the mix auger.
- Check both the lower and upper bearing. Are the bearings solid and are they greased? You may need to pull the dust cap off the Max Life bearing and inspect the internal bearings. Do they need to be repacked with grease?
- Inspect the auger hub located on the lower end of the auger. This hub should be recessed into a ring on the hopper wear plate. If there is a 1/8” or grader gap between the hub and the ring you need to replace the hub. This hub is the first line of protection for the seal system for the Max Life bearing.
- Check the cement bin and discharge auger for the cement. Is it clean from cement build up and is the inside of the bin clean of any hard cement? Check all bearings for the augers. These bearings will not have a grease zerk but inspect the seals to make sure they are good. Replace as needed.
- Check all the vibrators for proper operation. They must be operating for proper material flow.
- Fill air system lubricator with 10 wt. oil. Run vibrators to make sure lubricator is working and that the oil is dripping at the proper rate. One drop per cycle of vibration on the vibrator.
- Check out the water tank and system for proper operation. Is the tank clean inside and free of any algae? Algae will cause blockage to the suction side of the water pump. You must clean the tank. Does the water pump function properly and build 80 – 100 PSI of water pressure? This test will tell you the pump is in good working condition and ready to go. When running the water pump check for water leaks around the pump. If it is leaking this tells you the pump seal needs to be replaced.
- With the water pump running check the 421 valve for proper operation. This is the air valve that turns the water “On” and “Off” when you are mixing concrete. It also is controlled by a toggle switch for On/Off/Auto function. Test all 3 positions for proper operation.
- Flush out the admix tanks and system. Check the admix system for proper operation. Does the pump run, do it give you the proper flow rate, will the air valve turn “On” and “Off” correctly?
- You must recalibrate with materials you plan on using. This is very important so the unit is producing the proper mix. At a minimum the unit should be calibrated once a year and our recommendation is to do it quarterly.
- After calibration you should have a test lab run cylinder test so you know that the concrete design is breaking at the proper strength.
- Service the truck and check it out; re-certify the DOT inspection if needed.
Preventive maintenance goes a long way to a trouble free season for your business. If you have questions please call the Cemen Tech Service Department 800.247.2464 ext. 302 or fill out the Contact Us form.