Great Plains NTA3007HD Operator Manual - Manual (Page 46)

42 NTA907HD or NTA3007HD
166-207M 04/04/2011
Brake Operation (option)
Main transport wheel brakes are standard on model
NTA907HD. Brakes are not standard on model
NTA3007HD. There are brake shoe pairs on each of the
four forward main transport wheels. The shoe pairs are
operated by two independent systems:
1. The “service” or “trailer brake” system is controlled
by the tractor. It is connected to the tractor with a sin-
gle hydraulic line or two air lines.
2. The “parking” or “emergency
a
” brake system is con-
trolled by latching handles on either side, connected
by cables to the brake shoes for that drill side.
See also:
page 20 - “Brake Hookup (Option)”
page 103 - “Brake Troubleshooting (Option)”
page 118 - “Brake Maintenance (Option)”
Parking Brakes
Cable-operated parking brakes engage and release
independently of the service brake system. There is one
operating handle on each side frame of the drill, at the
rear of the front hopper.
The parking brakes themselves are independent sys-
tems for each side of the drill. None of these three brak-
ing systems can engage or release any of the others.
Refer to Figure 43
To engage drill parking brakes, pull each handle, on each
side, to the rear, until the over-center action holds the
brake engaged.
To release drill parking brakes, pull each handle, on each
side, outward from drill, and release forward.
If the handle fails to remain in the engaged position,
there is insufficient tension on the brake cable. If the han-
dle requires excess effort, or cannot be pushed into the
engaged position, there is too much tension. Rotate the
grip end
of the handle to adjust cable tension.
The tractor cannot release the drill parking brakes. Make drill
parking brake release part of your transport checklist. Trans-
port with drill parking brakes set will result in tire or brake
system damage.
a. The parking brake system is not a true emergency brake system, as there is no safe way to set the cable-operated brakes when the
drill is in motion. This manual therefore refers to it only as a Parking brake system.
Brake Roll-Away Hazard:
Set manual drill parking brake handle before unhitching drill.
Block tires for extra safety in case brake system is tampered
with or is not in working order. Parking jack is not sufficient
restraint for a drill parked on un-level ground. An unsecured
drill could roll away, causing an accident resulting in death,
injury and substantial property damage.
Both versions of the trailer brake system to the tractor are
spring-release on the air drill. Unless the drill parking brake is
set, drill braking is released shortly after unhitching the drill.
Null4:
Figure 43
Parking Brake Engaged
Parking Brake Released
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