Great Plains NTA3007HD Operator Manual - Manual (Page 122)

118 NTA907HD or NTA3007HD
166-207M 04/04/2011
Brake Maintenance (Option)
Brakes are self-adjusting, but there are several mainte-
nance items:
page 118 - Brake Line Charge and Bleed
page 120 - Air Brake Filter Cleaning
page 121 - Brake Drum and Liner Maintenance
Brake Line Charge and Bleed
Prior to first use, and after replacing any components
that carry brake fluid, and during periodic flushing of the
brake system, the brake lines need to be bled.
1. Spot the drill on a level surface at a safe distance
from any ignition sources (brake fluid is flammable).
Unless conditions are dry and calm, use a sheltered
area, to keep moisture and contaminants out of
brake fluid. Leave the tractor hitched to provide brak-
ing action to systems.
2. Unfold the drill and block the drill tires to prevent
movement. Do not set the drill’s own parking brakes,
as this restricts cylinder movement.
3. Put tractor in Park. Do not set tractor parking brake if
it also operates trailer brakes.
Refer to Figure 124 (which depicts air brake system - reservoir
for hydraulic brake system is similar)
4.
Clean and dry top of master cylinder reservoir .
5. Remove cap and keep free of contaminants.
Drain Hydraulic Brake Lines
6.
If draining brake system:
A. Remove drain plug at rear of reservoir and empty
reservoir. Re-secure plug.
B. Start at an outside hub for the following steps.
C. Connect recovery tubing to the bleeder valve
above the brake line. Unscrew valve to open line.
D. Operate tractor brakes to cycle drill system. Con-
tinue until no fluid flows at hub.
E. Close valve, and repeat step C and step D for the
other outside hub, then the inside hubs.
Refer to Figure 126 (which depicts air brake system - tee for
hydraulic brake system is similar)
F. Disconnect center port of brake line tee . Cycle
brakes until no fluid flows. Re-secure tee.
Null4:
Figure 124
Brake Master Cylinder
29584
Never re-use brake fluid. It is hygroscopic (formulated to
absorb water, which can damage system components if not
removed). Dispose of brake fluid per supplier instructions.
1
Null4:
Figure 125
Brake Cylinder Bleeder Valve
29585
2
1
2
Null4:
Figure 126
Brake Line Tee
29578
3 3