HOSE AS 9R4282 - Caterpillar

Illustration 1 g01191294
(1) Tilt Control Valve Body
(2) Line Relief Valve (Head End) (Tilt)
(3) Line Relief Valve (Ride Control)
(4) Line Relief Valve (Rod End) (Tilt) The line relief valve is installed in order to regulate the pressure spikes from either the implement pump or any unusual outside forces acting on the work tool. When the pressure is higher than the setting of the line relief valve, the relief valve opens. This allows high pressure to return to the hydraulic tank. The line relief valves prevent high pressure from damaging any components in the hydraulic system.Pilot Operated Line Relief Valve
Illustration 2 g01191544
Line Relief Valve (Tilt Control Valve) (Auxiliary Control Valve)
(5) Pilot oil passage
(6) Inlet
(7) Main Poppet
(8) Poppet Seat
(9) Spring Chamber
(10) Spring
(11) Pilot Poppet
(12) Pilot Spring
(13) Locking Nut
(14) Adjustment Screw
(15) Outlet Note: This type of line relief valve is used on the auxiliary control valve. This type of valve is also used on the tilt control valve of older machines.When