Great Plains NTA3007HD Operator Manual User Manual
Page 108
104 NTA907HD or NTA3007HD
166-207M
04/04/2011
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
Air/Hydraulic system: valve open
Close dump valve (page 122).
Close petcock (page 21).
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.
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.
Problem
Causes
Solutions