NC ENGINEERING MKII 600 Series, Operating, Maintenance And Safety Instructions, Page: 22 / 80

22
TROUBLESHOOTING
Watch for the symptoms described below and contact your dealer or NC Engineering for any
required repairs or parts. Use only the recommended lubricants and NC genuine parts.
Ensure that a competent person is carrying out all maintenance and repair work to your
machine.
Category Issue Possible cause Solution
Braking Brakes will not
release even with
park brake released
Damaged brake
assembly
Bring trailer to your
dealer for rework
Brake shoes bound up
at cams
Lubricate brake
operating parts
Brakes out of
adjustment
Adjust brakes.
Insufficient red line
flow (air brakes only)
Check connection to
tractor
Insufficient red line
pressure (air brakes
only)
Check pressure at
coupling is 6.5 ‐ 8.5
bar.
No brakes or
insufficient brakes
Source of air/oil shut
off at tractor
Check source
Low brake line
pressure
Check air/oil pressure
on tractor
Brake lines between
tractor and trailer not
properly coupled
Properly couple brake
lines
Reservoir drain bung
open
Close drain bung
Loadsensing valve out
of adjustment or
damaged
Check linkage &
settings
Brakes out of
adjustment
Adjust brakes
Slow brake
application or
release
Lack of lubrication Lubricate the relevant
components
Excessive travel in
brake chamber
Adjust brake lever
length
Restriction in hose or
air pipe
Replace the relevant
hose or air pipe
Defective brake valve Replace valve
Brakes over heating Park brake partially
applied
Check Park brake
Residual pressure in
brakes
Ensure no air trapped
in yellow line
Residual pressure in air
tank when using
hydraulic brakes
Drain air tank