Monitoring Block

TM 5-5420-279-23

1-10-40 Monitoring Block

A monitoring block is installed in the pressure line from the hydraulic pump to give hydraulic

pressure, flow and temperature indications to assist monitoring and fault finding of the hydraulic

system.

1-10-41 Filter Indicators

All hydraulic filters are equipped with an electrical indicator which signals filter restrictions to the

launch chest pack and electrical control cabinet.

1-10-42 Hydraulic Fluid Level Switches

The hydraulic reservoir is fitted with two fluid level warning switches, which produce warning

signals to the launch chest pack and the electrical control cabinet. One provides fluid low-level

warning indication and the other a warning of an unsafe fluid level with the potential to cause

damage to the hydraulic pump.

1-10-43 Hydraulic Reservoir Sampling Point

At the top of the hydraulic reservoir, a valved port is provided to permit hydraulic fluid sampling

from the center of the reservoir.

1-10-44 Interface Cabinet

The interface cabinet is installed at the right side of the launcher vehicle LV to the rear of

the crane stabilizer leg, and incorporates an internal mimic panel, which indicates the functioning

of the electrical controls and sensors of the hydraulic system. The cabinet also provides electrical

switches to deploy the A-Frame and test points to monitor the voltages and currents to the

solenoid control valves and the voltages in the control circuitry.

An hour meter, built into the cabinet, is connected to a pressure switch in each hydraulic

circuit to monitor and record the hydraulic system usage at pressures in excess of 440 Psi

(3033.69 kPa), i.e. when a selected function is operating. This record is used to assist collation of

failure data and the planning of routine maintenance.

1-10-45 Emergency Stop System

Emergency stop buttons are fitted at strategic locations where crew members are working

which stop all operating functions and disconnect the power take off in the event of an

emergency.

Eight emergency stop buttons are used, some of which are illuminated. Their quantities

and locations are:

1 - Crane

1 - Tail Lift

1 - Operator Panel

2 - Launch Frame

1 - Launch Chest Pack

2 - A-Frame Legs

Pressing any button will cause operation to cease and the PTO to disengage; the operator

panel of the interface cabinet identifying which button has been activated will illuminate. The

reason for emergency shut down should be ascertained and that it is safe to proceed before

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