Brake line charge and bleed, Drain hydraulic brake lines – Great Plains NTA2007HD Operator Manual User Manual
Page 123
Great Plains Manufacturing, Inc.
Maintenance and Lubrication
119
04/04/2011
166-283M
Brake Line Charge and Bleed
Equipment Damage Risk:
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.
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 and lower the drill to prevent movement. Do
not set the cart’s parking brakes, as this restricts cyl-
inder movement.
3.
Put tractor in Park.
Refer to Figure 106 (which depicts hydraulic brake system -
reservoir for air 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 the left 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 cart brake sys-
tem. Continue until no fluid flows at hub.
E. Close valve, and repeat step C and step D for the
other hub.
Refer to Figure 108 (which depicts hydraulic brake system -
tee for air brake system is similar)
F. Disconnect center port of brake line tee
. Cycle
brakes until no fluid flows. Re-secure tee.
Disassembly Impediment Risk:
Do not set tractor parking brake if it also operates trailer
brakes.
Null4:
Figure 106
Brake Master Cylinder
31245
1
2
Null4:
Figure 107
Brake Cylinder Bleeder Valve
31246
3
1
Null4:
Figure 108
Brake Line Tee
31247
4
3
4