17 EXCAVATOR OPERATION OPERATION OF THE BOOM To raise the boom, pull the attachment control lever back. The boom is equipped with a cushion cylinder which prevents excavated material in the bucket from fall-in out. By low hydraulic oil temperature, (e.g. right after starting the engine) the cushioning function will only be effected after a certain delay (approx. 3 to 5 seconds). This condition results from the viscosity of the hydraulic oil and is no sign of a malfunction. A When lowering the boom, make sure that it does not hit the dozer and that the bucket teeth do not touch the dozer. *NOTE: A See "SWIVEL MOVEMENT AND SWING MOVEMENT".
Lever position Movement Pattern A (JD) Pattern B (ISO) Left Front Attachment Control Lever A Boom lower Arm out B Boom raise Arm in *C Swivel to left Swivel to left *D Swivel to right Swivel to right Right Front Attachment Control Lever 1 Arm out Boom lower 2 Arm in Boom raise 3 Bucket dig Bucket dig 4 Bucket dump Bucket dump