GREAT PLAINS NTA3007HD, Operator'S Manual

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NTA907HD and NTA3007HD Table of Contents Index Troubleshooting
Great Plains | 166-207M | 02/26/2019 Table of Contents Index 103
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 119).
Air/Hydraulic system: valve open Close dump valve (page 121).
Close petcock (page 20).
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 malfunc-
tioning in tractor Check function with another trailer.
Tractor line pressure insufficient Have dealer check pressure at port.