MAINTENANCE CHECK TILT MECHANISM FULCRUM BOLTS FOR LOOSENESS 1. Check tilt mechanism fulcrum pin nut (1) for looseness every 250 hours. In case nut (1) is found loose, remove the operator’s seat access cover on the right side. Then, retighten nut (1) to 50 N⋅m (5.0 kgf⋅m, 36 lbf⋅ft). M1M7-07-079 2. Tilt the cab floor forward. Support the floor with a fall prevention bar. Retighten arrowed bolts (2, 3). (2) Tightening torque: 50 N⋅m (5.0 kgf⋅m, 36lbf⋅ft) (3) Tightening torque: 50 N⋅m (5.0 kgf⋅m, 36lbf⋅ft) 1 7-74 1 3 2 M1M0-07-030 M1M0-07-031 M1M0-07-032 M1M0-07-033
PREPARATION FOR INSPECTION AND MAINTENANCE When the floor tilt mechanism is used: CAUTION: Do not open or close the floor tilt mechanism in daily inspection. The daily inspection can be performed through the maintenance cover ports. MAINTENANCE CAUTION: When using the floor tilt mechanism, consult your nearest Hitachi dealer. If bolts (3) are removed or installed by unauthorized personnel, mismatch to ROPS may occur. When performing inspection and maintenance using the floor tilt mechanism, park the machine in the following procedure. 1. After operating the machine, wait the machine to sufficiently cool. 2. Park the machine on solid and level surface. 3. Lower the blade on the ground. 4. After rolling the arm and the bucket in, lower the bucket a wooden block down to the ground. 5. Face the front attachment straightforward toward the machine without swinging the front attachment at this time. 6. Stop the engine. Remove the key from the key switch. 7. Close the cab (optional) door. 8. After loosening two bolts (2) of cover (1) on the front of the base machine, fully slide the cover upward. Then, temporarily tighten bolts (2) so that the cover does not fall. 9. Remove bolts (3) (4 used) in the rear section of the operator’s seat. CAUTION: Be careful. When bolts (3) are removed, the cab may come off the floor. CAUTION: Be careful that if the floor is tilted upward while raising the front attachment, the cab may come in contact with the boom. 7-75 3 2 Ground Level M1M7-07-060 1 M1M0-07-034 M1M0-07-035
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