Great Plains NTA3007HD Operator Manual - Manual (Page 47)

Operating Instructions 43
04/04/2011 166-207M
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 vari-
ance from general behavior in the table at right. Make
sure the tractor operator knows when drill brakes are
engaged and released.
Null4:
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 immedi-
ately 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 .
Null4.aac:
Service Air Brakes Not Instantly Available:
Prior to movement, wait for the tractor air system to reach full
charge after drill hookup. Tractor and drill reservoir tanks
must be pressurized. Drill service braking may not be immedi-
ately available upon tractor hookup with the air/hydraulic sys-
tem.
Null4:
Tractor
Braking-
Related Event
Typical Trailer
Brake Port
Response
Record How
Your Tractor
Operates
Normal tractor
braking Activates trailer
brakes
Differential trac-
tor braking Reduced trailer
braking
Tractor Parking
Brake Activates trailer
brakes
Tractor Emer-
gency Brake
Tractor trans-
mission to Park No effect on
trailer brakes
Null4:
Figure 44
Hydraulic/Hydraulic Brakes
29588
1
2
3
1
2
3
4
5
6 5
7
8
Null4:
Figure 45
Air/Hydraulic Brakes
29578
4
6
5
7
8