Nilfisk-Advance RS 501, Service Manual

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ENGLISH SERVICE MANUAL
122 33015500(3)2008-02 RS 501
HYDRAULIC SYSTEM
HYDRAULIC SYSTEM OIL PRESSURE CHECK AT THE SUCTION FAN PUMP
NOTE
This check is necessary in case of malfunction of the suction fan.
Preliminary operations
Drive the machine on a solid and level ground, then engage the parking brake with the lever (66).
Turn the ignition key (76) to OFF position and remove it.
Remove the screws and the right panel (22) on the right side of the cab.
Connect a pressure gauge (E), with a minimum scale of 250 Bar equipped with the extension, to the pressure intake (C).
Measure the suction fan pump pressure according to the following procedure.
Pressure measurement
Start the machine and run the engine at maximum speed (as shown in the User Manual). In this condition, turn the lever (F) to
“OPT” position and check that the pressure measured by the pressure gauge (E) is 220 Bar approximately.
If the pressure is normal, disengage the lever (F) and turn off the machine.
If the pressure is higher or lower, it can be adjusted according to the following procedure, while keeping the machine
accelerated and the lever (F) engaged.
Pressure adjustment
Unscrew the cap (G).
Loosen the locknut (H) and slightly turn the internal threaded dowel (I) to adjust the pressure. If the pressure cannot be
adjusted to normal values, probably the pump needs to be replaced (see the procedure in the relevant paragraph).
Disengage the lever (F) and turn off the machine.
Tighten the locknut (H) and screw down the cap (G).
Reset
Perform steps 3 and 4 in the reverse order.
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