Lowering Boom with Engine Stopped

When an engine stops during operation, the boom cannot be lowered using the pilot controller because there is no pilot pressure oil to move the boom valve spool.

MR64971,0000061 -19-05DEC01-1/3

causym CAUTION: Prevent possible injury from unexpected machine movement. Clear all persons from the area before lowering the boom with the engine stopped.

causym CAUTION: Diesel fuel or hydraulic fluid under pressure can penetrate the skin and cause serious personal injury, blindness or death. If any fluid is injected into the skin, it must be surgically removed within a few hours by a doctor familiar with treating this type of injury.

To avoid injury from escaping fluid under pressure, stop engine and relieve the pressure in the system before disconnecting or connecting hydraulic or other lines. Tighten all connections before applying pressure.

T147038

MR64971,0000061 -19-05DEC01-2/3

1. Open enclosure door to access hydraulic control valve.

2. Loosen the jam nut and slowly turn adjusting nut counterclockwise until boom begins to lower. Allow the boom to lower until attachment is resting on level ground.

3. After the machine has been repaired, readjust the boom hoist port relief valve to the correct pressure.

T147039

MR64971,0000061 -19-05DEC01-3/3