HOSE 3541619 - Caterpillar

Illustration 1 g01425835
Cross section of the straight travel control valve and the main relief valve (1) Main control valve (2) Left travel control valve (3) Right travel control valve (4) Passage (5) Passage (6) Check valve (7) Check valve (8) Passage (9) Pilot passage (10) Main relief valve (11) Piston (12) Straight travel control valve (13) Return passage (14) Line (15) Line (16) Line (17) Drive pump (18) Idler pump (19) Pilot pump (20) Valve (21) ValveOil from idler pump (18) enters main control valve (1) through line (15). Oil from drive pump (17) enters the main control valve through line (16). Drive pump oil and idler pump oil flow through check valves (6) and (7) to passage (8). The check valves ensure that only the higher oil pressure from the drive pump or from the idler pump flows through passage (8) to main relief valve (10) .When the circuit pressure in passage (8) is lower than the pressure setting of the main relief valve, valve (20) is closed and valve (21) is closed. The closed valves do not allow oil to flow from passage (8) to return passage (13).
Illustration 2 g01715824
Main relief valve in