Great Plains 2525P Assembly Instructions - Manual (Page 13)

Charge and Bleed Front Page Appendix Great Plains Manufacturing, Inc. 13
2013-09-05 Front Page Appendix 113-786M
Bleed Sequenced System
These instructions presume step 51 on page 12 has
been completed.
Refer to Figure 17
60. Set buckets or other oil collection containers under
both marker base ends. Loosen (“crack”) the NPT
connection at the elbow.
61. Slowly Extend the remote circuit for Markers. When
oil seepage is observed at the marker cylinder base
end connection, set the circuit to Neutral and secure
the hose at the NPT fitting.
Note: With a sequence valve, which marker side is
initially active is random, depending on the
internal state of the sequence valve.
Note: If oil does not appear after a reasonable time,
increase flow at the sequence valve. Loosen both
jam nuts
. Turn both rate bolts counter-
clockwise one turn to allow more flow.
62. Slowly Retract the circuit to extend the opposite side,
until oil appears at the cracked connection. Set the
circuit to Neutral. Secure the connection.
63. Slowly Extend the circuit to fully extend on rod. Set
circuit to Neutral.
64. Move the buckets to the rod ends. At the cylinder
with the extended rod, crack the NPT connection at
the rod end elbow.
65. Slowly Retract the circuit to supply oil to that rod end.
When seepage appears, set circuit to Neutral, and
secure connection.
66. Continue to Retract, to fully extend the other cylinder
rod. Set circuit to Neutral. Crack the rod end NPT
connection at that cylinder.
67. Slowly Extend the circuit to retract the extended rod.
When seepage appears, set circuit to Neutral and
secure fitting.
68. Extend and retract the circuit a few times, checking
for leaks.
Re-Connect Cylinder Rods
69. Use the hydraulic power source to extend a cylinder
rod so that the clevis pin holes are within the range
of the lug channel slots. Capture the clevis in the slot
with the saved pin. Secure with second washer and
cotter pin.
High Pressure Fluid Hazard:
System bleed requires intentional hydraulic leaks. Escaping
fluid under pressure can have sufficient pressure to penetrate
the skin causing serious injury. Use a piece of paper or
cardboard, NOT BODY PARTS, to check for leaks. Wear
protective gloves and safety glasses or goggles when working
with hydraulic systems. If an accident occurs, seek immediate
medical attention from a physician familiar with this type of
injury.
Equipment Damage Risk:
Bleed only at JIC and NPT fittings.
Never try to bleed a QD (Quick Disconnect) fitting.
Avoid bleeding at ORB fittings. The O-ring is likely to be torn
if any pressure remains in the circuit.
Figure 18
Sequence Rate Adjust
14048
8
9
9
8 9
Pinch/Crush Hazard:
Step 69 requires extending cylinder rods while a second
worker guides the clevis into alignment with lug channel slots.
Keep hands out of the path of clevis motion.