MEGA Corp. MMP4-2 - Manual (Page 19)

MMP 4-2
5 Nov 2011
SECTION 4
Basic Hydraulics System
4-4
HYDRAULIC OIL COOLER
The hydraulic oil cooler is attached to the front
of the engine radiator. The engine cooling fan
draws cool air through the oil cooler lowering
the oil temperature. The oil cooler is in the
return to tank hydraulic circuit. Built into the
oil cooler is a bypass valve that allows oil to
bypass the cooler if the return oil pressures are
too great (e.g; when the hydraulic oil is cold).
The oil cooler and engine coolant radiator are
protected by a steel mesh guard to prevent
damage to the cooler and radiator.
HYDRAULIC HOSES
The MMP-4 is equipped with hydraulic hosing
to convey the hydraulic oil pressure and flow to
components that are operated by the hydraulic
control valve. These hoses are sized according
to the volume and pressure requirements of the
component. The hydraulic drive motor for the
water pump utilizes a 1” (-16) hose to direct the
volume of oil required to turn motor that drives
the impeller of the water pump at the rated
speed. The hydraulic cylinder hoses require a
smaller volume of fluid and do not require as
large of a hose. The makeup oil requirement
for the lift cylinders (when the booms move
down) are low pressure and low volume. The
suction side of the hydraulic pump requires
suction rated hydraulic hose, this prevents the
hose from collapsing under suction loads.