Great Plains NTA3007 Operator Manual - Manual (Page 125)

Great Plains Manufacturing, Inc. Table of Contents Index Troubleshooting 121
2012-07-02 Table of Contents Index 166-371M
Brakes always
engaged, all wheels 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
over-extended.
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.
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
specification, 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 139).
Distorted brake parts scraping Check brakes. Replace damaged parts.
Problem Causes Solutions