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MAINTENANCE
SECTION 8
Bleeding the Brakes
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CAUTION: AIR TRAPPED IN THE HY-
DRAULIC
BRAKE
SYSTEM
REDUCES
BRAKING EFFECTIVENESS. BLEED THE
POWER CLUSTERS, DISPLACEMENT CYLINDERS
AND WHEEL CYLINDERS.
If braking power is lessthan normal, there could possibly be
air in the hydraulic brake lines. If air doesget into the brake
lines, it must be bled out.
Air is most likely to enter at system leaks,disconnected brake
lines, or when the brake fluid level is low in the mastercylin-
der. Check all connections for the causeof air entering the
system.
Another indication of air in the hydraulic brake system is the
necessity of having to adjust the brake linings more frequent-
ly than normal.
Bleedingthe brake system is a two-man operation. Each brake
has its own hydraulic lines and master cylinder and is bled
independently of the others. Bleed the system as follows:
1. Park the machine and apply the parking brake. Lower the
bucket to the ground.
2. Run the engine until the air pressuregaugeis in the "RUN"
segment,then shut the enginedown.
3. Cleanthe power cluster reservoircaps off. Removethe caps
and fill the reservoirswith brake fluid up to the fluid level line.
Refer to "LUBRICANT SPECIFICATIONS AND CAPACI-
TI ES" in Section 7 for the type of brake fluid specified.
4. Start at the power cluster closestto one of the brake fluid
reservoirs. Open the bleeder screw (lllust, 17) on the power
cluster master cylinder.
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CAUTION: BE CAREFUL NOT TO SPLASH
BRAKE FLUID INTO EYES.
5. Havethe secondman in the operator's compartment slowly
depressthe brake pedal and hold it depressed.
Page13
BRAKES
6. Close the bleeder screw, then let up the brake pedal.
7. Repeat steps 5 and 6 until a stream of air-free fluid comes
from the bleeder screw.
NOTE: To eliminate the necessity of having to close the
bleeder screw after each time the brake pedal is depressed,
the following alternate bleeding procedure may be used. At-
tach a bleeder hose to the bleeder screw. Immerse the other
end of the bleeder hose in a clean jar partially filled with
fresh brake fluid. The brake pedal may be depressedand let
up, without the necessity of closing the bleeder screw, until
air-free fluid iscoming out of the hosein the jar. When air-free
fluid comes out of the hose, close the bleeder screw and
remove the hose.
Illust. 17
Power Cluster Bleeder
Screw (rightfront shown).
8. Openthe bleeder screw on the wheel cyl inder (3, Illust. 16)
connected to the power cluster master cylinder that wasjust
bled.
9. Perform steps5 through 7 on the wheel cylinder.
(Continued on next page)
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