Great Plains NP30A 30-foot Operator Manual - Manual (Page 129)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 125
2014-05-20 Table of Contents Index 407-502M
Caster Brake Adjustment
Refer to Figure 95
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 95 and Figure 96
The factory setting for a new piston is:
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 until the bolt reveal (from top of
welded nut to bottom of bolt head) is:
2.0 inches (5.1 cm)
5. Tighten the jam nut.
Use more or less tension as needed to eliminate caster
vibration during highway transport. Adjust as needed to
compensate for piston wear.
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
5
Figure 95
Caster Brake Components
32319
1
5
3
5
4
2
Figure 96
Rear Caster Adjustment Bolt
34955
5
3
2
1