Great Plains NTA2007HD Operator Manual - Manual (Page 105)

Great Plains Manufacturing, Inc. Contents Index Troubleshooting 101
04/04/2011 Contents Index 166-283M
Brake Troubleshooting (Option)
Problem Causes Solutions
Smoke or odd burning
odor from axle area Overheated brakes, typically on long steep
hills Stop immediately. Wait for brakes to cool
completely. Moderate downhill speed by
using lower gear and frequent full stops.
Check brake components for heat distortion.
New brakes may exhibit slight smoking or
odors until linings seat on drums. Check brakes if problem persists, or braking
action is insufficient.
Braking insufficient,
one wheel Tire under-inflated. Inflate all tires to specification.
Worn brake linings and/or drum Service brakes.
Worn or leaking brake cylinder Rebuild or replace cylinder.
Grease or oil on linings Correct problem causing contamination. Ser-
vice brakes.
Brake adjuster not adjusting Ice or dried mud can freeze mechanism.
Check for damage seizing movement. Check
for worn and inoperative pawl, or weak/dam-
aged/missing pawl spring.
Braking insufficient,
all wheels Air in drill brake lines Check for loose fittings. Check for damaged
fittings and lines. Check for damage or worn
operating components. Correct source of
leak. Recharge and bleed system.
Air/Hydraulic system: damaged diaphragm
in booster chamber Replace booster.
Air/Hydraulic system: leaks in air system Repair leaks.
Air/Hydraulic system: clogged filters Clean filters (page 121).
Air/Hydraulic system: valve open Close dump valve (page 123).
Close petcock (page 25).
Hydraulic/Hydraulic system: air in brake line
from tractor Bleed and recharge brake line.
Brake linings and/or drums worn Service brakes.
Brake linings replaced with unapproved
parts having inadequate friction rating Replace shoes with approved parts.
Pressure supplied by tractor insufficient 80 psi / 55 kPa minimum for air system.
No braking,
one wheel Bleed port open Close port. Re-charge and bleed system.
Brake lining worn or missing Inspect and repair as needed.
Brake cylinder frozen Inspect and repair as needed.
Brake parts broken or missing Inspect and repair as needed.
No braking,
all wheels Rule out problems at brake assemblies Check parking brake system. If doesn’t work
either, the problem is likely in the hubs. If
parking brakes do work, the problem is likely
above the hubs.
Loss of fluid in drill brake lines Check for fluid loss at all fittings and bleed
ports. Close/repair, recharge and bleed.
Line(s) to tractor improperly connected Check connections.
Trailer brake system disabled or malfunction-
ing in tractor Check function with another trailer.
Tractor line pressure insufficient Have dealer check pressure at port.