3PYPA
Table of Contents
Index
Maintenance and Lubrication
Great Plains
| 401-647M | 2019-06-11
Table of Contents
Index
121
Marker Fold Cylinder Bleeding
Refer to Figure 153 and Figure 154
Normally the marker 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.
1. Consult complete tilt circuit hydraulic diagram:
“
Wing Fold and Marker Hydraulics
”, page 148
(partially repeated here for reference)
2. Check that tractor hydraulic reservoir is full.
3. Unfold the wings (page 36). Turn the CFM Wing Fold
switch Off and leave it (and the Marker Tilt switch)
Off during this bleed.
4. Leave the markers tilted down for safer access to the
marker fold cylinders .
5. Disconnect rod ends of both marker fold cylinders.
6. Retract the marker fold circuit.
7. Loosen the JIC fittings at both marker fold cylinder
base ends .
8. Set marker fold circuit to Extend until fluid emerges.
9. Neutralize the circuit and secure the fittings.
10. Extend the tilt rods.
11. Loosen the JIC fittings at both marker fold cylinder
rod ends .
12. Set tilt circuit to Retract until fluid emerges.
13. Neutralize the circuit and secure the fittings.
14. Reattach the rod ends to the markers.
Marker Grease Seal Cap
If grease seal cap for marker-disk-hub bearings is
damaged or missing, disassemble and clean hub.
Repack with grease and install new seal or grease cap.
Chain Maintenance
Inspect and lubricate chains regularly. The slack of new
chains tends to increase during the first few hours of
operation due to seating.
See also “
Chain Routing
” on page 153.
Chain Slack
Check slack at fixed idlers within the first 8 hours of
operation and tighten idlers as necessary. Check slack at
spring-operated idlers seasonally.
Refer to Figure 155, which, for clarity, greatly
exaggerates slack, and omits the idlers.
1. Measure the span
for allowable slack:
Locate the longest span of each chain (usually the
span which does not run through the idlers).
Figure 153
Marker Fold Cylinder Location
25420
3
3
4
Figure 154
Marker Fold Cylinders
25062
L
R
4
4
5
5
5
4
Figure 155
Measuring Chain Slack
27264
2
1
1
