TM 5-2420-232-10
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AUXILIARY HYDRAULIC CIRCUIT (HAND TOOLS)
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The machine is equipped with an auxiliary hydraulic circuit to power the hand held tools (impact wrench, chainsaw, etc.).
When the circuit is enabled, hydraulic power is supplied by the hydraulic circuit to the auxiliary tool reel hoses. The circuit is
enabled by a switch (Figure 100, Item 1) in the cab. When the switch is turned OFF, the hydraulic supply to the auxiliary hoses
will be disconnected, allowing safe disconnection of the hand tool. The circuit also includes an external circuit deactivation
switch (Figure 101, Item 2) mounted outside the machine next to the hose reel. This switch is a simple push OFF/pull ON, red
emergency type switch. When operated it will deactivate the tool reel hydraulic circuit, removing all pressure to the tool. The
circuit will automatically be deactivated if the parking brake is released, drive is selected, or if the engine is stopped.
Circuit Operation
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With the system activated, oil is diverted to the circuit from the steering, thereby removing power steering ability while the
tools are being operated. However, should any transmission mode other than neutral be made, the supply will be returned to
the steering and the tool reel supply will be terminated.
NOTE
For the auxiliary hydraulic circuit to provide the optimum pressure for the tools circuit, set the hand
throttle, once the circuit is activated, to achieve an engine speed of 1,250 rpm.
Switch Location
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The operating switch is located in the switch bank to the right of the operator (when the operator is facing the front of the
machine) on the cab "B" post.
Figure 100. Switch Location
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