Nilfisk-Advance 56110000, Service Manual

Page: 45 / 102

FORM NO. 56043124 - Condor XL
™
- 45
ADJUSTMENTS/REPAIRS
HYDROBACK REPLACEMENT
1 Empty and remove the recovery tank.
2 See Figure 9. Loosen the jam nut holding the Push/Pull Control Cable (A) and Hydroback (D) in the mounting fork by the Piston Pump (G) .
3 Disconnect the Rod End (H) from the Piston Pump Lever Weldment (E) .
4 Loosen the locknut and remove the Rod End and locknut from the Push/Pull Control Cable.
5 Remove (unscrew) the old Hydroback from the Push/Pull Control Cable.
6 Install the new Hydroback unit onto the Cable. Note that the smaller end of the Cable will thread through the rear of the Hydroback and the
larger threads on the outside of the Cable will thread directly into the front of the Hydroback.
7 Reinstall the locknut and Rod End onto the Push/Pull Control Cable.
8 Reinstall the Rod End into the Piston Pump Lever Weldment.
9 Position the Push/Pull Control Cable and attached Hydroback into the mounting fork by the Piston Pump. Make sure the star washer is located
on the rear side of the mounting fork and contacts the front of the Hydroback, then tighten the jam nut.
10 After installing a new Hydroback unit, set the foot pedal/Hydroback neutral position according to the instructions in the FOOT PEDAL/HYDRO-
BACK NEUTRAL ADJUSTMENT section.
FOOT PEDAL NEUTRAL DEADBAND ADJUSTMENT
The resistance through the Rotary Sensor (rotary potentiometer) attached to the hydrostatic Piston Pump linkage will vary with the position of the
linkage. The Control Board must see the resistance through the Rotary Sensor within a particular range, called the neutral “deadband”, to con
fi rm
the Piston Pump is in neutral before the Board will allow the engine to start.
Once the engine is started, depressing the drive pedal moves the Rotary Sensor out of the deadband range. When the Control Board sees the
resistance from the Rotary Sensor out of the deadband range, it activates the various scrub/sweep functions.
Whenever you change or repair the drive pedal linkage components or the hydrostatic unit, or if you replace the Rotary Sensor or Control Board,
you will have to recalibrate the neutral deadband position and set the sensitivity.
1 Depress the foot pedal to full reverse position, then allow the pedal to slowly return to its neutral position. Do not move the pedal during the
remainder of this procedure.
2 Press and hold the Engine Speed Switch (51) , then turn the ignition Key Switch (50) to the run (on) position. Continue to hold the Engine Speed
Switch until all the display panel lights turn off (approximately three seconds), then release the Switch.
•
The fi rst line of the LCD display will read “PEDAL CALIBRATION”.
•
The second line of the display will read “Place Pedal in Neutral” with an arrow to the left of the line.
•
The third line of the display will read “Neutral Deadband”.
3 Press the green Scrub ON Switch (54) .
•
The fi rst line of the LCD display will read “Neutral Set”.
•
The second line of the display will show the resistance value, in ohms, that the Control Board is reading through the Rotary Sensor. Note
that it’s normal for this value to drift a little.
4 Press the green Scrub ON Switch to set the nominal deadband resistance value. The display will return to the previous menu.
5 Press the Side Broom Down Switch (53a) to move the arrow to the left of the “Neutral Deadband” line.
6 Press the green Scrub ON Switch to display the “Neutral Deadband” range menu. The percentages shown are the limits the resistance from
the Rotary Sensor can vary from the “Neutral Set” resistance and still be in the deadband range and allow the engine to start.
7 Press the Side Broom Up and Down Switches (53) to scroll through the available percentages. Note that 3% is the factory default value.
Note: The ideal neutral deadband percentage range is one that allows reliable starting, yet still actuates the scrub functions with minimal pedal
travel.
8 When the arrow is to the left of the desired percentage value:
•
Press the green Scrub ON Switch. The display will return to the previous menu and the new percentage value will be saved.
•
Press the red Scrub Off Switch to return to the previous menu without changing the percentage value.
9 Turn the ignition key switch to the off position. The new settings will be saved and remain in effect until they are changed again.