Great Plains NTA2007HD Operator Manual User Manual
Page 106

102
Great Plains Manufacturing, Inc.
NTA607/2007HD
166-283M
04/04/2011
Drill pulling to one side Parking brakes partially or fully engaged on
that side
Release parking brakes on both sides prior
to movement.
Check “wheel lockup” causes before flat
spots develop on tires.
Brakes always
engaged, all wheels
Drill parking brakes on during movement
Release parking brakes prior to movement.
Over-extended adjuster
Reset adjuster pawls and allow system to
self-adjust.
Air/Hydraulic system: Tractor air brake lines
reversed, and Supply line is causing brakes
to be always on
Reverse air line connections at hitch.
Hydraulic/Hydraulic system: Drill brake line
connected to incorrect always-on remote.
Connect drill brake line to correct remote.
Pressure supplied by tractor brake line is
always too high (hydraulic), or too low (air
brake)
Maximum allowed hydraulic pressure is:
150 bar / 2175 psi.
Minimum required air pressure is:
550 kPa / 80 psi
Dragging brake
Over-extended adjuster
Reset adjuster. Inspect to discover why it
overextended.
Debris in brakes
Remove brake shoes. Clean and dry.
Distorted brake parts scraping
Replace damaged parts.
Weak return spring
Replace all springs.
Piston seized in brake cylinder
Rebuild or replace cylinder.
Ice in parking brake lines
Warm and release lines. Check lines for
damage. Avoid cold weather movements
until cables are replaced.
Brakes grab, chatter or
rattle
Weak return springs
Replace all springs.
Drum worn, distorted or out of round
Re-surface drum if run-out is within specifi-
cation, otherwise replace.
Under-inflated or undersize tire in pair
Replace tire if inflation to specification does
not solve unequal contact problem.
Loose, worn, damaged or missing brake
components in hub
Inspect brakes.
Loose or worn wheel bearings
Replace bearings.
Flat spots on tires
See ““Brakes always engaged, all wheels”
Squealing from brakes Worn brake linings
Check brakes. Replace worn linings
(page 123).
Distorted brake parts scraping
Check brakes. Replace damaged parts.
Problem
Causes
Solutions