OPERATING THE MACHINE EMERGENCY BOOM LOWERING PROCEDURE WARNING: Prevent personal injury. Confirm that no one is under the front attachment before starting the procedure below. If the engine stalls and cannot be restarted, lower the boom to lower the bucket to the ground referring to the emergency boom lowering procedure stated below. 1. Remove the cover above the hydraulic oil tank. Loosen filler cap (1) on the hydraulic oil tank to release air pressure from the hydraulic oil tank. WARNING: Be sure to work only after oil temperature is low or before operation. Failure to do so may allow high temperature oil to spray, possibly causing severe burns. 2. Remove bolts (2) from the front and left side of cover (3) to remove cover (3). 5-26 1 3 M1M7-07-036 2 M1M0-05-003
3. Lower the boom in the following procedures. If the front attachment is not loaded. OPERATING THE MACHINE WARNING: Loosen overload relief valve slowly. If it is loosened rapidly, the boom may also lower rapidly. Do not loosen it more than 3/4 turns, as the hydraulic oil may spout. 1. Loosen the overload relief valve slowly by checking the movement of boom. 2. After checking that boom is lowered completely, tighten the overload relief valve. Torque: 60 to 70 N⋅m(6 to 7 kgf⋅m, 43 to 51 lbf⋅ft) If the front attachment is loaded. 1. Put the matching marks on lock nut in overload relief valve and adjusting screw in the boom raise circuit (cylinder bottom side). WARNING: Loosen the adjusting screw slowly. If it is loosened rapidly, the boom may also lower rapidly. 2. Loosen the lock nut. Loosen adjusting screw slowly by checking the movement of boom. 3. After checking that the boom is lowered completely, align the matching marks and tighten the lock nut. Torque : 28 to 32 N⋅m (2.8 to 3.2 kgf⋅m, 20 to 23 lbf⋅ft) 5-27 Overload Relief Valve in Boom Raise Circuit Lock Nut Adjusting Screw M1M0-05-012 T566-03-03-018
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