TM-9-2350-311-34-2

TM-9-2350-311-34-2 - Page 114 of 552

TM 9-2350-311-34-2

2-23 TROUBLESHOOTING CHART - CONTINUED

d. ELEVATING SYSTEM

The elevating system consists of a gunner’s selector switch box assembly, assistant gunner’s control assembly, gunner’s

control assembly, selector valve assembly, hydraulic pumping unit, manifold assembly, primary accumulator, secondary

accumulator, safety relief elevation valve assembly, and the equilibrated elevation mechanism assembly.

The gunner’s selector switch box assembly is used to electrically switch between power and manual elevation through the

selector valve assembly. The selector valve assembly allows for the powered elevation control from either of gunner’s

control assemblies. The gunner’s control assembly hydraulically operates the equilibrated elevation mechanism assem-

bly through the safety relief elevation valve assembly.

The equilibrated elevation mechanism assembly can also be operated manually using the hydraulic pumping unit at the

manifold assembly. Hydraulic pressure is supplied by the primary and secondary accumulators and through the equilibra-

tion lines.

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