Hagie STS14, Operator'S Manual, Page: 42 / 127

IV.
OPERATING SYSTEMS
4.19
C. HYDRAULIC SYSTEM
A. Hydraulic Pump
B. Power Steering
C. Solution Pump
D. Ladder
E. Tread Adjust
F. Spray Booms
G. Gear Pump
The AUXILIARY HYDRAULIC SYSTEM is a load sensing, pressure compensated system with efficiency in mind.
That means it only pumps the amount of oil needed to do the job.
The pump is mounted to the “front” of the second hydrostatic pump (fig. 4.19-1).The systems consist of a single vari-
able displacement pump that supplies the required hydraulics to operate the full time power steering unit, boom control
cylinders (lift, level, and fold), tread adjust, ladder, outer boom breakaway, and the solution pump.
The return oil from the load sense pump is mixed with the oil from the gear pump on the side of the engine (fig. 4.19-
7). This pump supplies a constant flow of oil from the hydraulic tank to the cooler and then back to the tank through the
filter. This is considered a kidney loop and is dedicated to the cooling and filtration of the hydraulic system.
FIG. 4.19-2
FIG. 4.19-6
F
B
FIG. 4.19-1
FIG. 4.19-3
C
FIG. 4.19-5
E
A
FIG. 4.19-4
D
FIG. 4.19-7
G