H&S GM 170 Operator's Manual And Parts List page 21

SELF-CONTAINED HYDRAULIC SYSTEM
Hydraulic System
The mixer has a self-contained hydraulic system featuring hydraulic
motor operated discharge augers and an optional hydraulic motor
operated swinging intake auger attachment. The self-contained hydraulic
system is composed of a pump, flow control with
cyclonic reservoir and oil filter.
Note: When operating at cold temperatures, allow the hydraulic oil in
the self-contained system to warm up at tractor idle speed with the
PTO running prior to grinding.
Pressure Relief Valves
Pressure relief valves on the variable speed controls for the Swinging
Intake Auger (SIA) if applicable, and discharge auger system provide
overload protection for the hydraulic system. The relief valves will permit
pressure buildup to a factory set value
hydraulic system operating pressure range is
the SIA is stopped by a malfunction or overloading, the pressure will build
up to the factory set cutoff pressure and the relief valve will open allowing
oil to flow directly through the flow control and continue to the flow control
for unloading augers which will continue to function. If one of the hydraulic
motors of the unloading auger system is stopped by a malfunction of the
component it is driving, the pressure will buildup to the factory set cutoff
pressure and the relief valve will automatically stop flow to the discharge
auger hydraulic system. The same applies to the intake auger system.
After the problem is corrected, the relief valve will automatically reset and
restore oil flow to the system.
Hydraulic Pump/Motor Drive
The GM 170 has a double sheave on the end of the main drive shaft
which is connected by a double banded belt to the hydraulic pump. The
pump is belt driven directly off the main drive shaft which is coupled by
the telescoping drive to the tractor PTO shaft. Overload protection for
the hydraulic pump is provided by a self-adjusting spring tightener.
IMPORTANT: Stop mixer operation if drive belt slipping is detected.
OPERATION
pressure relief,
of 3200 PSI. The self-contained
normally 500 to 2000 PSI.
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If
Shield removed for picture