OPERATING THE MACHINE 3. Do not operate the breaker with the hydraulic cylinders fully extended or retracted. When operating the breaker, position each hydraulic cylinder so that the allowance more than 50 mm from the stroke end can be given before the cylinder piston comes in contact with the cylinder head or bottom. Failure to do so may result in damage to the hydraulic cylinders, arm and/or boom. 4. Do not operate the breaker in water. Seals may become broken due to rusting of the breaker, possibly allowing rust, dust, and/or water to enter the hydraulic circuit so that damage to the hydraulic components on the base machine may result. 5. Do not use the breaker to lift objects. Serious accidents may result due to tipping over of the machine and/or coming off of the lifted load. 6. Do not operate the breaker over the side of the machine. The machine stability is reduced, possibly resulting in tipping over of the machine. In addition, the service lifetime of the undercarriage may become shorter due to receiving more severe breaker operation reaction force. 5-20 RIGHT WRONG WRONG WRONG M1M7-05-021 WRONG M104-05-059 WRONG M1M7-05-022 RIGHT M1M7-05-017
Average Breaker Operating Availability OPERATING THE MACHINE 7. Do not allow the breaker chisel to come in contact with the boom when rolling in the arm and the breaker. 8. Change hydraulic oil and replace the full flow filter element at the regular intervals. Hydraulic breaker operation subjects hydraulic oil to become contaminated and/or deteriorated more quickly than bucket operation. Failure to perform proper maintenance of hydraulic oil may cause the base machine and/or the breaker to malfunction. Be sure to change hydraulic oil and replace the full flow filter element at the intervals as shown in the table below to especially extend the service life of the hydraulic pump. (Refer to the Hydraulic System group in the Inspection and Maintenance Section.) 100% 80% 60% 40% 20% 0% Hydraulic Oil change and Full Flow Filter Element Replacement Intervals (Hours) Hours to Replace Element Hours to Replace Hydraulic Oil 0 500 1000 1500 2000 Excavator Operating Hours M1M7-05-027 9. Greasing Front Attachment When using a hydraulic breaker, grease all lubrication points on the front attachment every 50 hours of operation. 5-21 Watch Out! Take care not to hit the boom with the breaker M1M7-05-023
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