Great Plains 2525P Operator Manual - Manual (Page 60)

56 2020P/2025P and 2520P/2525P Great Plains Manufacturing, Inc.
118-231M 2013-05-10
Marker Maintenance
High Pressure Fluid Hazard:
Escaping fluid under pressure can have sufficient pressure to
penetrate the skin. Check all hydraulic lines and fittings
before applying pressure. Fluid escaping from a very small
hole can be almost invisible. Use paper or cardboard, not
body parts, and wear heavy gloves to check for suspected
leaks. If injured, seek medical assistance from a doctor that is
familiar with this type of injury.
Marker Cylinder Bleeding
Refer to Figure 69
Always bleed at a JIC or NPT fitting.
Never bleed an O-Ring Boss (ORB) fitting.
1. Begin with drill lowered, and with both marker sides
extended. For sequenced markers, see “Both Sides
Unfolded (with Sequence Valve)” on page 21.
2. Note the position of the cylinder stop.
3. Un-pin the rod end of the marker cylinders, and ori-
ent the cylinders so that the rods may extend with-
out striking marker components.
4. Loosen the JIC fitting at the base end of one
marker cylinder.
5. Extend the circuit until fluid appears at the loosened
fittings. It may be necessary to
extend-retract-extend to cycle the sequence valve to
that marker. Set circuit to Neutral. Secure fittings.
6. Loosen the JIC fitting at the rod end of that same
marker cylinder.
7. Retract the circuit until fluid appears at the loosened
fittings. Set circuit to Neutral. Secure fittings.
8. Repeat for the other side.
9. Re-orient cylinder stop to position noted at step 2.
10. Re-pin marker rod ends.
Figure 69
Marker Bleed
17643
26222
2
1
1
2
1
2