HOUSING-FLYWHEEL 4P8534 - Caterpillar

Secondary Steering Pump and Motor
Part No: 139-2327
Illustration 1 g00104478
Secondary Steering Pump and Motor (1) Secondary steering motor. (2 ) Inlet. (3) Secondary steering pump. (4) Ground terminal. (5) Positive terminal. (6) Outlet.The motor operates at 24 VDC.Normal operating temperature for the motor is 20°C (70°F).Type: Gear pumpTest the pump with SAE 10W oil. The oil should be 50°C (120°F).Test the motor at full speed (24 VDC): Output ... 32 L/min (8.5 US gpm) Pressure ... 4500 kPa (650 psi)Note: The secondary relief valve is built into the secondary steering pump.Primary and Secondary Steering Oil Pressure Switch
Part No: 3E-6450
Illustration 2 g00102189
Primary and Secondary Steering Oil Pressure Switch (1) Torque for installing the pressure switch ... 75 7 N m (55 5 lb ft)Maximum actuation pressure at -40° to +121°C (-40° to +250°F) ... 1200 kPa (175 psi)Deactuation pressure at -40° to +121°C (-40° to +250°F) ... 700 100 kPa (100 15 psi)Contacts (A) and (C) are normally closed below the deactuation pressure of the pressure switch.Contacts (A) and (B) are normally open below the deactuation pressure of the pressure switch.Secondary Steering Valve
Part No: 141-2597
Illustration 3 g00104585
Secondary Steering Valve Group (1) Cap end. (2) Inlet from secondary steering pump. (3) Inlet from primary steering pump. (4) Secondary steering oil pressure switch port. (5) Primary steering oil pressure switch port. (6) Output to primary steering main control valve. (7) Secondary steering system check valve. (8) 2S-2596 Spring : Length under test force ... 200 mm (7.9 inch) Test force ... 4.23 0.34 N m (3.12 0.25 lb ft) Free length after test ... 33.3 mm (1.311 inch) Outside diameter ... 8.43 mm (0.332 inch) (9) Primary steering system check valve.