Great Plains NTA3007 Operator Manual - Manual (Page 56)

52 NTA907 or NTA3007 Table of Contents Index Great Plains Manufacturing, Inc.
166-371M Table of Contents Index 2012-07-02
Brake Operation (Option)
Main transport wheel brakes are standard on model
NTA907. Brakes are not standard on model NTA3007.
There are brake shoe pairs on each of the four forward
main transport wheels. The shoe pairs are operated by
an air system on the drill. The “service” or “trailer brake”
system is controlled by the tractor. It is connected to the
tractor with a single hydraulic line or two air lines.
See also:
page 29 - “Brake Hook-Up (Option)”
page 120 - “Brake Troubleshooting (Option)”
page 135 - “Brake Maintenance (Option)”
Service Brake Operation
If optional brakes are installed and connected, the
hydraulic/hydraulic or air/hydraulic systems automatically
work in conjunction with the tractor’s own brakes.
Application and release of tractor brakes during tractor
motion applies and releases the service brake system on
the drill.
Know Your Tractor Systems:
Application of tractor Parking and/or Emergency brakes may
or may not operate the drill service brake system, depending
on the design of the tractor systems.
Consult your tractor manual for details on when remote
brake ports are engaged and released. Note any
variance from general behaviour in the table at right.
Make sure the tractor operator knows when drill brakes
are engaged and released.
Single-Line Hydraulic Brake Operation
In this system, a single hydraulic line
from the tractor
operates a de-intensifier cylinder on the drill, which is
coupled to the drill master cylinder . The drill brake
hydraulic lines are separate from the tractor’s line.
With the hydraulic/hydraulic system, braking is
immediately available when the tractor hydraulic system
is active.
Dual-Line Air/Hydraulic Brake Operation
In this system, the “supply” (yellow or blue coded) line
charges a reservoir air tank
on the drill. The “service”
(red coded) line meters air from the reservoir to a
booster cylinder , which operates the drill’s hydraulic
brake lines .
Roll-Away Hazard:
Block tires with wheel chocks before unhitching drill. The
parking jack is not a sufficient restraint for a drill parked on
unlevel ground. An unsecured drill could roll away, causing an
accident resulting in death, injury and substantial property
damage.
Both versions of the service brake system to the tractor are
spring-release on the drill. Drill braking is released shortly
after unhitching the drill.
Tractor
Braking-Related
Event
Typical Trailer
Brake Port
Response
Record How
Your Tractor
Operates
Normal tractor
braking Actuates trailer
brakes
Differential
tractor braking Reduced trailer
braking
Tractor Parking
Brake Actuates trailer
brakes
Tractor
Emergency Brake
Tractor
transmission to
Park
No effect on
trailer brakes
Figure 48
Hydraulic/Hydraulic Brakes
29588
1
2
3
1
2
3
4
5
6 5
7
8