BRACKET 4B5230 - Caterpillar

Illustration 1 g03407144The secondary steering pump is a fixed displacement gear pump. Drive shaft (1) turns drive gear (4), which forces idler gear (2) to turn. A seal is formed by the gears against pump housing (5). As the gears turn, oil enters through inlet port (3). The oil is trapped between the teeth and the pump housing. The oil is pulled around the outside of the gears. The oil is then forced out of outlet port (6).
Illustration 2 g03407134
Secondary steering schematic
(7) Check valves. (8) Secondary steering pump. (9) Diverter valve.
Secondary steering pump (8) has four check valves (7). The check valves direct the flow of hydraulic oil that is entering and exiting the secondary steering pump. The oil flows from the secondary steering pump to diverter valve (9). When the machine is moving, the oil always flows to the diverter valve.
Illustration 3 g03407140
Location of the Secondary Steering Pump
(8) Secondary steering pump. (10) Output transfer gear housing. (11) Output shaft.
Secondary steering pump (8) is a ground driven pump mounted to the front of the output transfer gear housing (10) above output shaft (11). The pump is only active while the machine is moving.If the primary steering pump fails to pump oil or if the engine stops, diverter valve (9) will allow pressure oil from secondary steering pump (8) to flow to the steering control spool.If the primary steering pump fails to pump oil, the pressure switch will activate. This flow switch controls a circuit in the operator compartment which alerts the operator of a failure by sending a warning signal to the cab.