Great Plains NP4000 40-foot Operator Manual - Manual (Page 89)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 85
2012-03-28 Table of Contents Index 407-776M
Caster Brake Adjustment
Refer to Figure 60
The rear lift-assist wheels each have independent
adjusters for the caster pivot brake. The piston
acts as
a pivot brake, and helps prevent caster oscillation during
transport. The adjustments will vary depending on
different field-to-field conditions as well as road transport
conditions.
If the caster is oscillating during transport turns or in field
use, adjust the pressure plate bolt
.
Pressure Plate Adjustment
Refer to Figure 60 and Figure 61
1.
Loosen the jam nut .
2. Turn the bolt counterclockwise until the bolt is
turning freely.
3. Drive screw in (down) until it contacts spring plate .
4. Drive screw in another 1 inch (2.5 cm).
5. Tighten the jam nut.
Use more tension as needed to eliminate caster vibration
during highway transport.
Replace UHMW piston if its length is less than
1
1 ⁄
4
in. (3.2 cm). Also replace piston if missing,
damaged, tilted, or top of piston is visible.
1
3
4
2
Figure 60
Caster Brake Components
32319
1
2
3
2
4
1
Figure 61
Rear Caster Adjustment Bolt
32359
2
3