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SECTION 8
MAINTENANCE
Page
14
SERVICE BRAKES - Continued
Bleedingthe Brakes- Continued
10.
Bleed the second power cluster master cylinder and
wheel cylinder for the same axle.
11.
Bleed the other axle brake system as shown in steps
4
through
9.
12.
Refill the brake fluid reservoirs to the fluid level line.
Breathers
Each power cluster is equipped with a breather.
1.
Remove the breathers from the power clusters.
2.
Wash them in a commercial cleaning solvent to completely
remove any contaminants from the cap.
3.
Dry thoroughly, using a light pressureof compressedair, or
shaketo remove asmuch solvent aspossible.
4.
Dip the caps in clean engine oil. Allow excessoil to drain
out.
5.
Install the breathersback in place.
PARKING BRAKE
This machine is equipped with an air-over hydraulic-released,
spring-applied disc-type parking brake. When the parking
brake knob is pulled out to OFF position, air pressure is
applied to the actuator, overcoming the spring tension in the
brake calipers, thereby releasingthe parking brake. If a leak
occurs in the air lines, or air pressureis low in the system, the
parking brake will automatically be applied.
There is no adjustment to compensatefor lining wear. Check
the amount of lining wear periodically. When the linings get
down to
1/8
inch thick, or if they no longer hold, replacethe
lining pads.
Checking the Fluid
Eachparking brake caliper hasanactuator to operate it. Check
BRAKES
the fluid level in eachactuator fluid reservoir. Refer to "SE R-
VICE POINTS" for the level-checkingprocedure.
Bleeding the Brake
If the parking brake lining padsare draggingor won't release,
it is possible there is air in the hydraulic parking brake lines.
If this is the case, bleed the hydraulic lines as follows:
1.
Station a helper in the operator's compartment.
2.
Block the machine wheels to prevent possible machine
movement and lower the bucket to the ground.
3.
Start the engine and let it run until the air pressuregauge
indicator is in the "RUN" area.
4.
Shut the enginedown.
5.
Fill the parking brake actuator reservoirs to the proper
level.
6.
Push the parking brake knob in.
7.
Open the bleeder screw on one of the displacement cylin-
ders (lilust.
18).
lIIust. 18
Displacement Cylinder.
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