HEAD GP-MOTOR 1130122 - Caterpillar

Illustration 1 g00797202
(1) Pilot line (2) Supply line to work tool (3) Return line from work tool (4) Main control valve (5) Drain line (6) Auxiliary valve spool (7) Passage (8) Relief valve (9) Passage (10) Pilot valve (11) Line (12) Hydraulic tank (13) Pilot manifold (14) Supply line from pump (15) Pilot pump (16) Right pumpPilot pump (15) sends pilot system oil to pilot manifold (13). The pilot system oil then flows through line (11) to pilot valve (10).
Illustration 2 g00797265
(10) Pilot valveWhen the work tool is operated in the one-way direction by pressing the front of the pedal, pilot oil is sent from pilot valve (10) to the top of auxiliary valve spool (6). Auxiliary valve spool (6) shifts downward.Reference: Refer to Systems Operation, "Pilot Valve (Hydraulic Control)" for the operation of the pilot control valve.High pressure oil from right pump (16) flows to auxiliary valve spool (6) through line (14) and passage (9). This oil flows through auxiliary valve spool (6), through passage (7), and line (2) to the work tool.The return oil from the work tool flows through line (3) to the hydraulic filters and hydraulic tank (12).
Illustration 3 g00797252
(8) Relief valve for work toolThe pressure in the work tool is controlled by relief valve (8) .Note: The pressure setting for the relief valve must be reset to the specification of the supplier for the work tool that is being used.