HARBEN 903-1315, Operation & Maintenance Manual

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4.5.3. Checking the Operating Pressure with a Gun Fitted
1. Fit the gun (with the appropriately sized H.V. (pencil) or Fan Jet), to the high-pressure
hose.
2. WARNING! Ensure the gun is held firmly in the hand. If the operator loses control
of the gun, it can hit someone and cause serious injury. (H&S Section 3 and 15)
3. Start the engine.
4. Press the button to divert the water to the gun. Use the button to raise the
engine speed.
5. Pull the gun trigger and observe the pressure gauge mounted on the instrument panel,
note the pressure reading (See Fig. 3). Press the button until engine tick over
speed is reached, then press the ‘water off’ button and return the unit to the idle position
Note: If the pressure is significantly lower than expected, turn the unit off and replace
the worn nozzle in the gun with a new one!
Fig 4. Operating with the Radio Remote
When using the RCU the operator is required to remove the key form the Local/Remote
selection whenever the trailer/van pack is unattended.