Opening of Bids - One (1) or More New Positive Displacement Hydro-Excavating Machine with Tandem Axle Cab & Chassis Spec U - Best Equipment Co., Inc.

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TROUBLE SHOOTING CHECKLIST a T TROUBLE ITEM POSSIBLE CAUSE REMEDY No Air Flow 1 Speed too low Check by tachometer and compare with speed shown on Roots Order Acknowledgement. 2 Wrong rotation Compare actual rotation with Figure 1 and arrow on blower. Compare driver if wrong. 3 Obstruction in piping Check piping, screen, valves, silencer, to assure an open flow path. Low Capacity 4 Speed too low See item 1. If belt drive, check for slippage and readjust tension. 5 Excessive pressure Check inlet vacuum and discharge pressure, and compare these figures with specified operating conditions on Order. 6 Obstruction in piping See item 3. 7 Excessive slip Check inside of casing for worn or eroded surfaces causing excessive clearances. Excessive Power 8 Speed too high Check speed and compare with Roots Order Acknowledgement. 9 Pressure too high See item 6, 10 Impellers rubbing Inspect outside of cylinder and headplates for high temperature areas, then check for impeller contacts at these points. Correct blower mounting, drive alignment. Overheating of 11 Inadequate lubrication Restore correct oil levels in main oil sumps. Bearings or Gears 12 Excessive lubrication Check oil level. If incorrect, drain and refill with clean oil of recommended grade. 13 Excessive pressure See item 5. 14 Coupling misalignment Check carefully. Realign if questionable. 15 Excessive belt tension Readjust for correct tension. Vibration 16 Misalignment See item 14. 17 Impellers rubbing See item 10. 18 Worn bearingsigears Check gear backlash and condition of bearings. 19 Unbalance or rubbing Scale or process material may build up on casing and impellers, or inside impellers. Remove build-up to restore original clearances and impeller balance. 20 Driver or blower loose Tighten mounting bolts securely. 21 Piping resonances Determine whether standing wave pressure pulsations are present in the piping. Refer to Sales Office. ❑ Do not use air blowers on explosive or hazardous gases. ❑ Other potential hazards to safety may also be associated with operation of this equipment. All personnel work- ing in or passing through the arek should be warned by signs and trained to exercise adequate general safety precautions. A good program of inspection and maintenance servic- ing followed consistently, is the most reliable method of minimizing repairs to a blower. A -simple record of services and dates will help keep this work on regular sschedule. Basic service needs are lubrication, checking for hot spots or increase in vibration and noise, and the recording of operating pressures and temperatures. Above all, a blower must be operated within its specified rating limits to obtain satisfactory service life. A newly installed blower should be checked frequently during the first month of full-time operation. Attention thereafter may be less frequent, depending on what the early checks have shown. Lubrication is normally the most im- portant consideration. Unless operating conditions are unusually severe, a weekly check of oil levels in the gear- box and bearing reservoirs, with addition of oil as required, should be sufficient. Complete oil changes at intervals of 500 operating hours is normal; more frequent if oil condi- tion becomes poor. Change intervals may be extended for light duty (see Fig.-4). Driver lubrication practices should be in accordance with the manufacturer's instructions. If directly connected to blower through a lubricated type coupling, the coupling should be checked and greased each time blower oil is changed. This will help reduce wear and prevent it from causing vibra- tion. In a belted drive system, check belt tension periodically and inspect for frayed or cracked belts. Refer to tension- ing instructions under INSTALLATION.