MacDon R85 Rotary Disc 16 Foot Pull-Type - Manual (Page 215)

MAINTENANCE AND SERVICING
8.9.6 Changing the Hydraulic Oil Filter
Change hydraulic oil filter after the first 100 hours operation and every 250 hours thereafter.
To change the hydraulic oil filter, follow these steps:
1. Clean around the filter head (A).
2. Remove the filter (B) and clean the gasket surface of
the filter head. If oil runs out of filter head, lower the
front of hitch as low as possible.
3. Apply a thin film of clean oil to the gasket on the
new filter.
4. Install new filter. Turn the filter onto the mount until
the gasket contacts the filter head. Tighten the filter an
additional 1/2–3/4 turn by hand.
IMPORTANT
Do NOT use a filter wrench to install the filter.
Overtightening can damage gasket and filter. Figure 8.128
Pressure Relief Valve
A possible cause of poor cutting performance and/or
excessive heating of hydraulic oil is low relief pressure.
The relief valve (A) is factory set at 5800 psi (40 MPa). See
your MacDon Dealer for adjustment or service.
Figure 8.129
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Rev. D