MTS Hydraulic Power Unit Model 506-92 - Manual (Page 16)

3-4 Service
3 . 1 . 1 . 2 Low-Pressure Filter Replacement
The low-pressure filter element requires replacement whenever hydraulic
fluid in the HPU reservoir is replaced, or the Filter Dirty indicator on the
HPU front control panel lights.
1
bleed screw
with O-ring
filter
O-ring (supplied with
filter)
VW-GO49
O-ring
filter housing
See Figure 3-1 for the location of the filter. Refer to the figure on the
left to locate the components accessed for the following procedure.
1. Press Stop on the HPU. The output pressure gage must read zero.
2. Disconnect the cable from the filter manifold.
3. Remove one of the two bleed screws at the top of the filter cover.
4. Place a container under the filter drain and drain the fluid. Dispose
of the fluid according to company policy.
5. Replace and tighten the bleed screw and drain plug.
6. Hand turn the handle counterclockwise until it screws off. Remove
the cover.
7. Remove and discard the filter element. Inspect the filter housing for
any remaining contamination.
8. Insert a new filter element (MTS part number 114028-17).
9. Hand tighten the cover. Reconnect the cable.
After you have
finished Purge the filter housing of air and allow it to fill with fluid as follows:
1. Open the bleed screw 1-1/2 turns.
2. Press the Reset control to reset the Filter Dirty indicator.
3. Jog the supercharge pump motor by pushing the Start button with
neither main pump selected, then immediately pushing the Stop
button. Continue this procedure until hydraulic fluid appears at the
loosened bleed screw.
4. Close and tighten the bleed screw.