MTS Hydraulic Power Unit Model 506-92 - Manual (Page 15)

Service 3-3
3 . 1 . 1 . 1 High-Pressure Filter Replacement
CHANGE
OK
DIRT ALARM
VW-GO46
Replace the high-pressure filter elements whenever the DIRT ALARM
indicator mounted on the base of each high-pressure filter housing
points to CHANGE (red or yellow zone) or whenever the hydraulic
fluid is replaced.
End Cap – Top View
unscrew to
remove endcap
VW-GO47
unscrew to
bleed
1. Press Stop on the HPU. The output pressure gage must read zero.
2. Loosen the air-bleed screw on top of the filter housing endcap.
With a container under the manifold drain port (Figure 3-1), open
the port to drain the fluid for both filters (the pressure accumulator
also drains).
When the fluid is drained, close the drain port and tighten the air-
bleed screw. Discard the fluid according to company policy.
spring
plate
spring
filter
filter housing
O-ring and backup ring
VW-GO48
3. Unscrew and remove the endcap. Remove the compression spring
plate on top of the filter elements and remove the filter elements.
4. Remove and save the grommet between the two filter elements.
Discard the filter elements.
5. Inspect the O-ring and back-up washer in the end-cap. If
replacement is not required, clean and lubricate them with clean
hydraulic fluid.
6. Inspect the filter housing for any remaining contamination.
7. Insert two clean filter elements (MTS part number 100533-05), with
the grommet between the two elements, into the filter housing.
8. Inspect the compression spring plate and replace the end-cap.
Taking care not to damage the O-ring and the back-up washer,
tighten the end-cap.
After you have
finished Operate the HPU in low pressure for 5 minutes to remove air from the
filter housing. Check for leaks while doing this.