86 HT25 - MAINTENANCE TRENCHER Check teeth for wear every 10 hours. Replace worn teeth, using Ditch Witch replacement parts and maintaining original tooth pattern. If using rock chain bits, check that bits rotate freely. Clean chain and check bits after each use. Replace bit when tungsten cap or insert is worn, or adapter can be damaged. Check chain every 10 hours. Replace worn or broken chains. If sidebars are bent or loose on chain pins, chain spacers should be used to join sidebars. For more efficient digging, contact your Ditch Witch dealer for information about the tooth pattern best suited to your jobsite. p Teeth and Bits Chain