SHAFT (14 T) 8S7039 - Caterpillar

Illustration 1 g00826518
Hydraulic Schematic for Secondary Steering Systems that use Metering Pumps (1) Secondary steering valve (2) Metering pump (steering) (3) Neutralizer valve for a left turn (4) Left turn stop (5) Neutralizer valve for a right turn (6) Right turn stop (7) Steering control valve (8) Selector spool (9) Directional spool (10) Crossover relief valve for the steering cylinders (11) Left steering cylinder (12) Right steering cylinder (13) Primary steering pressure switch (14) Check valve (15) Secondary steering pressure switch (16) Check valve (17) Secondary steering pump and electric motor (18) Signal line (19) Relief valve for the secondary steering pump (20) Steering pump (21) Flow control orifice (22) Breaker relief valve (23) Relief valve for the case drain for the steering pump (24) Hydraulic oil tank (AA) Pressure tap for checking steering pump pressure (BB) Pressure tap for checking signal pressure
Illustration 2 g00296719
Component Locations for the Secondary Steering SystemLeft Side View (1) Secondary steering valve. (12) Right steering cylinder. (17) Secondary steering pump and electric motor.
Illustration 3 g00296724
Component Locations for the Secondary Steering SystemRight Side View (2) Metering pump (steering). (7) Steering control valve. (11) Left steering cylinder. (24) Hydraulic oil tank.Note: The secondary steering system is an attachment for these machines. The secondary steering system should only be used if there is a failure of the primary steering system. Additionally, only use the secondary steering system