BACKHOE CONTROL VALVE LEVERS AND LINKAGE (4)

TM 5-2420-222-20-1

HYDRAULIC SYSTEM - CONTINUED

Four levers with mechanical linkage attached to six valve spool devises.

Outboard levers allow operator to control backhoe control valve left and right stabilizer valves to move left and right

stabilizers up and down separately.

Left inboard lever (to operator's right when facing rear) allows operator to control backhoe control valve crowd and

bucket valves to extend and retract dipperstick and backhoe bucket separately or at the same time. Also controls

rotation of hydraulic earth drill auger when installed.

Right inboard lever (to operator's left when facing rear) allows operator to control backhoe control valve boom and

swing valves to extend or retract, and swing boom separately or at the same time.

BACKHOE CONTROL VALVE-TO-BACKHOE STABILIZER CYLINDER OIL LINES (4)

Route high pressure hydraulic fluid between backhoe control valve left and right stabilizer valves, and left and right

stabilizer cylinders.

BACKHOE STABILIZER CYLINDERS (2)

Connected through high pressure oil lines to backhoe control valve left and right stabilizer valves.

Separately raise and lower backhoe stabilizers.

BACKHOE CONTROL VALVE-TO-BACKHOE CROWD CYLINDER OIL LINES (2)

Route high pressure hydraulic fluid between backhoe control valve crowd valve and backhoe crowd cylinder.

BACKHOE CROWD CYLINDER

Connected through high pressure oil lines to backhoe control valve crowd valve.

Extends and retracts backhoe dipperstick.

BACKHOE CONTROL VALVE-TO-BACKHOE BUCKET CYLINDER OIL LINES (2)

Route high pressure hydraulic fluid between backhoe control valve bucket valve and backhoe bucket cylinder or

hydraulic earth drill when Installed.

BACKHOE BUCKET CYLINDER

Connected through high pressure oil lines to backhoe control valve bucket valve.

Extends and retracts backhoe bucket.

HYDRAULIC EARTH DRILL (NOT SHOWN)

Attachment clamped between backhoe bucket jaw and backhoe bucket when installed.

Auger rotation powered by high pressure hydraulic fluid through backhoe control valve-to-backhoe bucket cylinder

oil lines.

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