Great Plains
| 118-949M | 2018-07-03
104
1525P and 1510HDP
Maintenance and Lubrication
Bleeding Marker Hydraulics
To function properly, the marker hydraulics must be free
of air. If hydraulics have not been bled, they will operate
with jerky, uneven motions and could cause markers to
drop rapidly during folding or unfolding. If hydraulics were
not bled during initial implement setup or if you replace a
part in hydraulic system during the life of the drill,
complete the following procedures.
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!
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.
Refer to Figure 160 (which depicts the left side of a
dual marker and sequence valve - the procedure is the
same for single markers and dual-singles)
1.
Extend a marker on one side.
2.
Disconnect the rod end
at the marker arm.
3.
Support the cylinder so that the rod cannot strike
anything over its full range of travel.
4.
Supply oil until the rod is fully retracted.
5.
Set circuit to neutral.
6.
Carefully crack the JIC fitting
at the base end.
7.
Supply oil to Extend until the fitting seeps. Set circuit
to neutral and tighten fitting.
8.
Supply oil until the rod is fully extended. Set circuit to
neutral.
9.
Carefully crack JIC fitting
at rod end of cylinder.
10. Supply oil to Retract until fitting seeps. Set circuit to
neutral and tighten fitting.
11. Adjust rod extension and re-pin.
12. Repeat bleeding for other marker side.
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.
Bleed only at JIC and
NPT (National Pipe Thread) 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.
Size
Foot-Pounds
N-m
3
8
-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 160
Marker Cylinder Bleed
26247
1
3
2
