NMC-WOLLARD MB-4 200-DF, Operation, Maintenance And Parts Manual

Page: 79 / 321

Never use common auto-
motive hydraulic brake fluid such as dot
or SAE J70. Seals used at each brake
piston are incompatible with this fluid
and rapid seal deterioration will occur if
such fluid is used.
Any brake service other than periodic in-
spection or bleeding brakes should be
performed only by personnel specially
trained in brake service.
Never touch rubber parts with oily or
gasoline-soaked fingers. wash hands
with soap and water before handling
parts.
Never place brake system rubber parts
in contact with gasoline, diesel fuel, or
any other type of cleaner other than an
approved type.
Clean brake system rubber parts in
clean, denatured (isopropyl) alcohol, ap-
proved brake cleaning solution, or brake
fluid.
8.3 BRAKE SYSTEM INSPECTION
Periodic brake inspections are a must for
safe and efficient operation. Your inspection
should be thorough.
8.3.1 Inspect Brake Disks and Linings
Every 2000 Tractor Operating
Hours.
Inspection ports are provided in axle hous-
ing near center differential to inspect brake
pads without removal of axle assembly.
1. Remove brake inspection port plug.
2. Inspect brake linings on both sides of
brake disk.
3. If brake lining material is worn down to
the bottom of the oil grooves, brake disks
must be replaced.
8.4 BLEEDING THE BRAKES
8.5 BRAKE LINES
Check brake metallic lines and hoses for
leaks whenever servicing the brakes.
Check the lines for signs of deterioration,
cuts, kinks and other damage. Replace any
line that is questionable.
Failure of a brake line or
fitting can result in a serious accident
and possible personal injury. Always re-
place lines that are questionable.
Never use your hand to
check for leaks. High pressure hydraulic
oil can cut through skin.
Always wear eye protec-
tion when working with hydraulics to
avoid injury. Wear heavy gloves when
working with heated components.
8.5.1
SAE 37
°
Flare Connection (JIC)
Flared fittings are essential on high-pres-
sure applications. Most of the leaks that oc-
cur at this connection are due to lack of
tightening or human error. You can’t tell if
the nut has been tightened just by looking
at the connection. If it is more than finger
tight, you can’t tell by observation by how
much.
Assembling flared connections
Proper tightening is essential. Since torque
wrenches are not always used when they
should be, here is a foolproof method of
tightening:
M200 MB4 Tow Tractor Manual No. 42975
PAGE 8-3
JULY 15, 2001