Great Plains NTA3007HD Operator Manual - 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 Clean filters (page 120).
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.
See “Dragging brake” topic. Check “wheel lockup” causes before flat
spots develop on tires.
Problem Causes Solutions