HARBEN 4018 US Van Pack, Operation & Maintenance Manual

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3. To increase the amount of water to the nozzle, turn the handle clockwise to start
closing the valve. The pressure will increase as you start to close the valve.
4. Once the ideal pressure is reached, the valve can be left at that position until the job
is finished.
4.10. Hose Reel Winding and Unwinding
The high-pressure hose is manually unwound and hydraulically wound by a hydraulic motor,
which is driven by a gear pump from the engine P.T.O. (H&S Section 6)
The motor is fitted to the hub of the hose reel. The motor speed and direction are controlled
via a manually actuated spool valve.
The hose reel motor speed can be adjusted up and down by a flow control knob.
Pushing the lever inwards towards the pump set will wind the hose reel in.
The normal practice is to unwind the hose by hand, only drawing off the required length of
hose to reach the work site and then to wind the hose back in using the hydraulic motor.
It should be remembered that the hose cannot be wound using the hydraulic motor unless the
engine is running.
Therefore, when a jetting operation is finished, wind in the hose before shutting down the
engine. Wind in the hose before you intend to empty the tank.
CAUTION! If the hose becomes stuck in the drain the hydraulic hose reel should NOT be
used as a winch to try and free it and the towing vehicle should NEVER be driven away to
drag the hose clear. This will put severe strain on the reel framework which could lead to
serious damage. (H&S Section 3, 6, and 13)
Hoses that have become stuck can sometimes be pulsed free using the Harben® Jump Jet™
kit or alternatively they should be pulled free by hand.
NOTICE: The bypass valve is a “fine tuning” instrument! Close it in small increments until the desired
performance is reached. A simple quarter turn of the valve can result in several hundred PSI increases.
NOTICE: Please note the working pressure for the unit must never be exceeded .
NOTICE: The hose should NEVER be tightly wound onto the hose reel drum when the hose is not
pressurized, as might occur when the hose has become trapped. A tightly wound hose can easily
crush the hose reel when it is next pressurized. If you have reason to believe that the hose may
have been tightly wound onto the reel when unpressurised it should be completely unwound and
then rewound loosely before pressurizing.