SPECIFICATION & STRUCTURE
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7. HST
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The hydrostatic unit, 1, consists of a variable displacement piston type pump, 2, fixed displacement piston type motor, 3,
high pressure relief valve, 4, two feed valves and neutral valve assemblies, 5.
The input shaft, 6, driven by the engine flywheel, is splined to the variable displacement, piston pump and extends out
the rear side of the unit to drive the PTO shaft, 7.
The charge pump draws hydraulic fluid from the reservoir to pressurize the HPL system. 7 liters of that pressurized fluid
is directed to the power steering system.
The remainder of the pressurized fluid is directed to the HST system via the HST filter.
Fluid is pressurized by the piston pump, 2, sent to the motor, 3, driving the transmission drive shaft, 8, which powers the
transmission assembly.
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