Great Plains NTA3007HD Operator Manual - Manual (Page 109)

Troubleshooting 105
04/04/2011 166-207M
MetaData: End of Troubleshooting
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 122).
Distorted brake parts scraping Check brakes. Replace damaged parts.
Problem Causes Solutions