Fayat DYNAPAC F1000T T4f, Operation & Maintenance Manual

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Maintenance – DEF tank
Clean the DEF tank
- Drain the tank.
- Remove the Multifunction Head Unit from the tank.
- Inspect the debris saturation of the DEF suction filter to determine if the filter needs to
be replaced. If the filter is damaged or dirty, replace the filter.
- Rinse out the interior of the DEF tank using an ordinary hose or pressure washer.
- Rinse off the MFHU from top to bottom with low pressure, ensuring that all the debris
has been removed.
- Reinstall the MFHU and the drain plug to fill the tank and verify no leakage occurs.
Multifunction Head Unit (MFHU) assembly
MFHU Installation:
-
Apply a thin layer of O-ring lubrication to the Bore seal O-ring.
- Fold the Filter element in half towards the bottom of the Tri-Function Sensor. Tilt the
header to an approximate 45
˚ angle, with respect to the top of the tank. With the heel of
the Tri-Function Sensor foot angled upward, place the filter edge and the toe of the
Tri-Function Sensor into the tank bore. Gradually work the bottom portion of the DEF
head into the Bore opening until completely inserted in the tank.
- Position the DEF head unit in the desired orientation and press on the top of the blue
MFHU Removal:
-
Using a T25 Torx Driver, unscrew the
retention screws that secure the Retaining
Ring to the reservoir.
- Using a flathead screwdriver, gently pry
around where the head unit is connected to
the reservoir while simultaneously pulling
on the top of the unit. Continue until DEF
mounting base is free from reservoir.
- Pull the DEF head unit out until the bottom
of the header is at the bottom of the tank
bore.
- Angle the heel of Tri-function sensor foot
upward and rotate the header until the
bottom of the header is positioned inside
the tank bore. When the bottom of the
header is in the tank bore, fold the filter
downward towards the interior of the tank.
Continue to carefully remove the header
out of the tank bore until completely freed.