Great Plains DVN8324 Operator Manual - Manual (Page 50)

46 8315-8324DVN Great Plains Manufacturing, Inc.
550-466M 11/25/2013
Brake Maintenance (Option)
Brakes are self-adjusting, but there are several mainte-
nance items:
page 46 - Brake Line Charge and Bleed
page 48 - Air Brake Filter Cleaning
page 48 - 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 machine on a level surface at a safe dis-
tance from any ignition sources (brake fluid is flam-
mable). Unless conditions are dry and calm, use a
sheltered area, to keep moisture and contaminants
out of brake fluid. Leave the tractor hitched to pro-
vide braking action to systems.
2. Unfold the machine and block the machine tires to
prevent movement. Do not set the machine’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 37 (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 ,
Refer to Figure 38 , above the brake line. Unscrew
valve to open line.
D. Operate tractor brakes to cycle machine system.
Continue 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 39 (which depicts air brake system - tee for hy-
draulic brake system is similar)
F. Disconnect center port of brake line tee . Cycle
brakes until no fluid flows. Re-secure tee.
Figure 37
Brake Master Cylinder
41874
1
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.
Figure 38
Brake Cylinder Bleeder Valve
29585
2
1
2
Figure 39
Brake Line Tee
41873
3
3