TM 5-3805-280-24-2
Hydraulic System
LOWER BOOM WITH ENGINE STOPPED
(USING BOOM CYLINDER LOAD LOWERING
VALVE)
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 or to
unlatch the boom load lowering valves.
CAUTION: Prevent possible injury from
unexpected machine movement. Clear all
persons from the area before lowering the
boom with the engine stopped.
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.
1. Loosen jam nut on relief valve (A). Back off relief valve
set screw, counting number of turns, until boom starts
to lower slowly.
2. After bucket is on ground, reset relief valve (A) by
turning set screw clockwise the same number of turns
noted in step 1 and lock jam nut.
A--Relief Valve
B--Boom Cylinder
33
3360
20
CED,OUOEBAS,5
1921JAN001/1
21-59