The pump illustrated in Figure 4B-1 is representative of the
DUAL PUMPS (41Z55 & 41Z56)
dual pumps. The pump consists principally of an outlet
body, inlet housing, outlet cover, driveshaft and two
pumping cartridges. The principal components of each car-
Dual hydraulic pump 41Z55 is used to develop fluid flow
tridge are an elliptical cam ring, a slotted rotor splined to the
for the operation of the main winch and boom telescope
driveshaft, a pressure plate, wear plate, and ten vanes fitted
circuits, while dual pump 41Z56 provides flow for the
operation of the swing and boom hoist circuits.
to the rotor slots.
Figure 4B-1. Dual Pumps (41Z55 and 41Z56)