Great Plains YP1625A Operator Manual - Manual (Page 101)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 97
2013-08-13 Table of Contents Index 401-625M
Bleeding Hydraulics
High Pressure Fluid Hazard:
Relieve pressure before disconnecting hydraulic lines. Wear
protective gloves and safety glasses or goggles when working
with hydraulic systems. 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. If an accident occurs, seek immediate
medical attention from a physician familiar with this type of
injury.
Only trained personnel should work on system hydraulics!
Bleeding Lift Hydraulics
Normally the lift hydraulics are bled at the factory before
shipping and bleeding should not be required other than
to raise fully and hold lever on for one minute or until all
cylinders extend fully.
Bleeding Fold Cylinder Hydraulics
Normally the fold hydraulics are bled at the factory before
shipping and bleeding should not be required other than
to fold fully and hold lever on for one minute or until all
cylinders reach the end of their stroke.
Machine Damage Risk:
Do not fold or unfold without first raising
planter completely.
If the fold and hold procedure does not clear the
problem, perform the following steps:
1. Raise and unfold the planter.
2. Un-pin all fold cylinders (two at center, one each
gauge wheel).
Refer to Figure 122
3.
Locate the re-phase port on each cylinder. This is a
raised blind weldment on one end of the cylinder
tube. This is the rod end on gauge wheel fold
cylinders, and the base end on center fold cylinders.
4. Support the cylinder with the re-phase port facing up,
and that end of the cylinder elevated.
5. Fully extend all cylinders at low flow. Hold circuit for
one minute.
6. Fully retract all cylinders at low flow. Hold circuit for
one minute.
7. Set circuit to neutral and re-pin all cylinders.
JIC Torque Chart
Over-Torque Leak Risk:
JIC (Joint Industry Conference 37
° Flare) fittings do not
require high torque. Excess torque causes leaks. JIC and
ORB (O-Ring Boss) fittings do not require sealant.
System Contamination Risk:
Always use liquid pipe sealant when adding or replacing NPT
(
National Pipe Thread, tapered thread) 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.
Note: Bleed only at JIC and NPT fittings. Never attempt
to bleed a QD (Quick Disconnect) fitting. Avoid
bleeding at ORB fittings.
Size Foot-Pounds N-m
7 ⁄
16
-20 11-12 15-16
1 ⁄
2
-20 15-16 20-22
9 ⁄
16
-18 18-20 24-28
3 ⁄
4
-16 38-42 52-58
7 ⁄
8
-14 57-62 77-85
11 ⁄
16
-12 79-87 108-119
Figure 122
Cylinder Re-Phase Port
29502