Lull 944E-42 Service Manual User Manual download pdf (Page 452)

100

101

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

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.

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