90 HT25 - MAINTENANCE TRENCHER 8. Stand clear of chain and remove lock key from connector pin. Drive connector pin out of link. Crushing weight could cause death or serious injury. Use proper procedures and equipment or stay away. Fluid pressure could pierce skin and cause injury or death. Stay away. NOTICE: Service digging boom grease cylinder only while standing on opposite side of boom. Wear gloves and safety glasses and cover fitting with cloth when relieving pressure in cylinder. 7. Loosen plug on grease cylinder to relieve chain tension. 9. Unclamp links. Slowly release cable and lower chain to ground. 10. Lay chain on ground with teeth down. p sf1014 sf1026