MacDon M155 Operators Manual - Manual (Page 273)

MAINTENANCE AND SERVICING
5.2.5 O-Ring Boss (ORB) Hydraulic Fittings (Adjustable)
1. Inspect O-ring (A) and seat (B) for dirt or
obvious defects.
2. Back off the lock nut (C) as far as possible. Ensure that
washer (D) is not loose and is pushed toward the lock
nut (C) as far as possible.
3. Check that O-ring (A) is NOT on the threads, adjust
if necessary.
4. Apply hydraulic system oil to the O-ring (A).
Figure 5.6: Hydraulic Fitting
A - O-Ring B - Seat C - Nut
D - Washer
5. Install fitting (B) into port until back up washer (D) and
O-ring (A) contacts on part face (E).
6. Position angle fittings by unscrewing no more than
one turn.
7. Turn lock nut (C) down to washer (D) and tighten to
torque shown. Use two wrenches, one on the fitting (B)
and the other on the lock nut (C).
8. Check the final condition of the fitting.
Figure 5.7: Hydraulic Fitting
A - O-Ring B - Fitting C - Nut
D - Washer E - Part Face
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Revision A