Marker maintenance, Marker cylinder bleeding – Great Plains 2525F Operator Manual User Manual
Page 52
48 2020F, 2025F, 2520F and 2525F
118-232M
01/23/2012
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 immediate medical assistance from a physician familiar
with this type of injury.
Marker Cylinder Bleeding
Bleed only at:
JIC (Joint Industry Conference, 37
°
flare) or
NPT (National Pipe Thread, tapered thread) fittings.
Avoid bleeding at:
ORB (O-Ring Boss)
Never bleed at:
QD (Quick Disconnect) fittings.
JIC fittings do not require high torque. JIC and O-ring fittings
do not require sealant. Always use liquid pipe sealant when
adding or replacing (NPT) pipe-thread fittings. To avoid
cracking hydraulic fittings from over tightening, and to keep
tape fragments from clogging filters, do not use plastic sealant
tape.
1.
Begin with drill lowered, and with both marker sides
extended. For sequenced markers, see “Both Sides
Unfolded (with Sequence Valve)” on page 20.
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 without
striking marker components.
4.
Loosen the JIC fitting
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 cir-
cuit 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.
FigureSpacer
Figure 59
Marker Bleed
17643
26222
2
1
1