TM 5-3805-281-24-1
Tests
1. Remove the control valve access cover.
2. Loosen nut (C).
CAUTION: To avoid injury from escaping fluid
under pressure, never loosen boom manual
lower needle valve more than 4 turns from
closed position as valve may come out of
housing. Tighten valve and nut before applying
pressure.
Prevent possible injury from unexpected
machine movement. Clear all persons from the
area before lowering the boom with the engine
stopped.
3. Check that the area is clear of all persons before
lowering boom.
Slowly, loosen boom manual lower needle valve (B)
1/2--1 turn. The boom will start to lower.
Turn needle valve out more to increase boom lowering
speed or in to decrease lowering speed. Remember,
no more than 4 turns from the closed position.
4. After bucket is on the ground, tighten the needle valve
9025
25
and then the nut.
44
Boom Manual Lower Needle Valve to Housing--Specification
Torque .......................................................... 5.9--9.8 Nm (4.4--7.2 lb-ft)
(53--86 lb-in.)
Boom Manual Lower Needle Valve-to-Housing Nut--Specification
Torque ........................................................ 35--47 Nm (25.8--34.7 lb-ft)
(310--416 lb-in.)
NOTE: Leakage may result if the boom manual lower
needle valve and nut are not tighten to
specification. Be sure to tighten the needle valve
and nut to specification.
A--Boom I Section
B--Boom Manual Lower Needle Valve
C--Nut
D--Boom Reduced Leakage Valve
CED,TX08227,3023
1917MAR982/2
6-191
