NP30A or NP40A
Adjustments
95
2019-03-11
407-502M
Caster Brake Adjustment
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 72 and Figure 73
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.
Pull-Type Wing Caster Brake Adjustment for Field
Use
On wing caster wheels only apply light pressure (
1
/
8
inch
or less) to allow for easier swiveling of casters during
turning.
1
3
4
5
Figure 72
Caster Brake Components
32319
Figure 73
Rear Caster Adjustment Bolt
34955
2