Lull 944E-42 Service Manual - Manual (Page 452)

Hydraulic System
8.200 Model 644E-42/944E-42 Rev. 6/04
d. Brake Test
Carefully bleed the brake lines as soon as the brake valve
is installed in the vehicle. Air in the system will not allow
the brakes to apply properly. There are four brake
bleeder locations (1) on the axles. Work with an assistant
to perform this procedure.
1. Place the travel select lever in the [N] NEUTRAL
DETENT position, engage the park brake switch and
start the engine.
2. Have the assistant frame sway the vehicle full left to
expose the brake bleeders on the right front and
right rear axles.
3. Remove the plastic cap from the front brake
bleeder (1). Attach one end of a length of
transparent tubing over the brake bleeder. Place the
other end of this tubing into a suitable transparent
container that is partially filled with hydraulic oil. The
end of the tubing must be below the oil level in the
container.
4. DO NOT open the brake bleeder without holding the
tubing firmly on the bleeder. There is pressure at the
brakes. Carefully open the bleeder with a 12 mm
wrench. Have the assistant depress the brake pedal.
Close the brake bleeder when air bubbles no longer
appear in the oil. Release the brake pedal. Remove
the tubing from the brake bleeder.
5. Repeat Steps 3 thru 4 for the right rear brake.
6. Frame sway the vehicle full right, exposing the brake
bleeders on the left front and rear axles.
7. Repeat Steps 3 thru 4 for the left front and left rear
brakes.
8. Conduct a pressure and function check of the
service brake and the accumulator system. Refer to
Section 8.7, “Hydraulic System Testing.”
MU2010
1
WARNING:
Avoid prolonged engine
operation in closed areas with inadequate
ventilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.
WARNING:
Escaping hydraulic fluid
under pressure can penetrate the skin, causing
death or serious injury.