15
CAUTION!
DO NOT USE A PRESSURE HOSE THAT IS NOT
RATED FOR VACUUM FOR THE SUCTION HOSE.
The standard pump for our generator is rated with
both vacuum and pressure requirements. During
normal operation, the suction hose experiences a
maximum of 60 psi; however, upon startup the pump
will pull a vacuum. If a non-vacuum rated hose is
used, its interior wall will collapse. Evidence of this
is sustained cavitations of the pump during startup.
Repeated sustained cavitations will damage the
pump.
SAE100R5 hose is not acceptable. This type of
hose does not carry enough vacuum rating in the
sizes above #12. Verify the suction hose size during
installation or service. Incorrect hose sizing may
cause hydraulic pump failures, poor operation and
may result in personal injury or equipment damage.
The SAE100R4 hose maximum working pressure for
a band clamp or a bolted clamp (similar to a radiator
hose clamp) is only 50 psi. This type of clamp will
not carry the required pressure rating; therefore, a
crimped hose end must be used. All fittings are JIC
37° Flare.
See the hydraulic schematics on the following pages
for hose routing. It is important not to cross hoses
during installation. We recommend marking and
capping/plugging hose ends before routing hoses. It
is very easy to mix them up once they are routed in
the vehicle.
KEY POINTS
• Keep hose lengths as short as possible. If the
hose length is 20ft or longer, increase the hose
diameter. Contact the Harrison factory for a
recommendation.
• Hose sizes and hose fittings must match.
• Always flush and blow out hoses before use.
• Mark and cap all hose ends before routing.
• Hoses flex under pressure. Do not band them
together tightly, pull them tight, or cut them too
short.
• Never bend hoses beyond the manufacturer’s
recommended bend radius. Hoses will pinch if
you exceed the bend radius of the hose, causing a
restriction in the flow. Avoid short elbows. If a
90° fitting must be used, use a sweeping 90°
instead of a short 90°.
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