RETURN LINE FILTERS
SUB-SECTlON 4E
SUB-SECTION 4E
RETURN LINE FILTERS
REPLACEMENT
RETURN LINE FILTER (46Z180)
Repair of the return line filters is limited to replacement of
DESCRIPTION
the complete filter. In the event, that it is necessary to
replace the return line filters, proceed as follows (see Figure
Two full flow filters, located at the right rear corner of the
engine compartment, are used to filter the oil in the hy-
4E-1):
draulic system before it is returned to tank.
1. Lift the rear end of the machine using the rear out-
The filters are designed to provide full flow filtration of all
riggers. This will ensure that the oil level in the hydraulic
the oil returning to the hydraulic tank. A poppet type
tank is below the level of the return manifold.
by-pass valve is provided in the filter head, which permits
part or all of the oil to by-pass the filter element when it
2. Support the return line filter to be removed, and remove
becomes clogged, or when the viscosity of the oil is too
the four socket head capscrews on each side of the filter.
high, due to cold weather. (See Figure 4E-1.)
Remove the filter from the machine.
3. Remove the O-rings from the adapter flanges, and inspect
them for damage or brittleness. If either of these conditions
exist, replace the O-rings.
4. Coat the O-rings with a small amount of grease, and
install them on the adapter flanges.
5. Position the new filter between the adapter flanges and
install the socket head capscrews.
6. Operate the hydraulic system for several minutes and
check the filter for leakage.
Figure 4E-2. Filter Replacement.
Figure 4E-1. Filter Operation
4E-1
