Hog Technologies SK5500, Operation Manual, Page: 62 / 161

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Section 2 - Stripe Hog Systems
Hydraulic Hoses
The hydraulic system operates at pressures of up
to 2,500 psi (172 BAR). Therefore, it is critical that
operator and maintenance personnel inspect hy-
draulic hoses, fittings and other components fre -
quently. A visual inspection of the entire hydraulic
system should be conducted each day before
operating the unit. Any hose or component that is
questionable or shows any sign of deterioration,
wear or leakage should be replaced immediately
and before operating the unit. A more thorough
inspection of the pump and components should
be conducted at each routine service interval. Re-
member that the hydraulic system can be severely
damaged if it runs low on fluid.
Protect the hoses from contact with sharp objects
or kinks. Never operate the hydraulic system with
a damaged hose or a hose that is questionable.
2.14 Hydrostatic Drive Hydraulic System
The Hydrostatic Drive pump is bolted to the auxil-
iary engine PTO. It is activated whenever the PTO
clutch is engaged. The CLUTCH switch is energized
by the PTO switch on the control panel which also
disengages the truck drive system when it is on.
After the PTO switch is turned on, the CLUTCH
switch is used to engage and disengage the clutch
and hydrostatic drive pump.
Once activated, the hydrostatic drive is controlled
by the FWD/REV switch and TRUCK SPEED dial. A
swash plate controlled by the FWD/REV switch and
the TRUCK SPEED dial in the control panel directs
fluid flow and pressure output from the pump,
setting the speed and direction of the hydrostatic
drive motor.
Hydraulic fluid is provided by the reservoir/cool -
ing tank. A cooling fan on the Reservoir and an
auxiliary heat exchanger with cooling fans pro-
vides continuous cooling for hydraulic fluid dur -
ing operation. Electric solenoid valves, activated
by the FWD/REV switch and TRUCK SPEED dial
control the fluid flow in the system. In-line “Spin
On” filters protects the system from debris. A
status indicator on the high pressure filter alerts
the operator when the filter is dirty and requires
changing.
Hydraulic Fluid Coolers
The hydraulic fluid reservoir is equipped with a
built-in cooling fan that cools the fluid as it cir -
Hydraulic Fluid Heat Exchanger
culates through the reservoir. Another heat ex-
changer equipped with two cooling fans is located
behind the auxiliary engine on top of the forward
clean water tank. All cooling fans run constantly
whenever the cab control switch panel is activated.
The coolers loose efficiency if they become dirty.
It is important to inspect the coolers at least once
a week and clean them as necessary. If the coolers
are not cleaned regularly, debris can buildup to the
point where they become ineffective, causing the
fluid and components to overheat. This can result
Auxiliary Engine PTO & Hydrostatic Drive Pump
& High Pressure Filter