4-44 Inspection, Maintenance and Adjustment
022-00029AE Operation and Maintenance Manual
2,000 HOUR / ANNUAL SERVICE
PERFORM ALL 10 HOUR / DAILY, 50, 150, 250, 500 AND 1000 HOUR SERVICE CHECKS
REPLACE HOSES
1.
Replace hoses that carry brake fluid to wheel brakes. Also replace hoses that carry hydraulic fluid to
steering cylinders.
2.
It is difficult to determine condition of many hoses. The best way to ensure safe operation and to
maintain maximum performance is to replace hoses on a regular basis. If any brake or steering hoses
become damaged or appear defective in any way, replace them immediately despite time interval
since their last replacement.
BLEED BRAKES
When brake hoses or brake tubes are replaced, air can be introduced into brake hydraulic system. Air can
cause brakes to operate intermittently, which is a dangerous condition. Never operate machine with air in
brake hydraulic system. A spongy feel when pressing brake pedal is a sign that air is present in brake
hydraulic system.
To bleed air out of brake hydraulic system,
perform the following steps:
1.
Start engine and place transmission in
"NEUTRAL."
2.
Remove rubber cap from bleeder screw on
wheel.Place one end of a plastic hose (2,
Figure 80) over bleeder screw (1). Place
other end of hose in a container (3) filled
with brake fluid.
3.
Station one person in operator’s cab, and
one person at bleeder screw on wheel
being bled.
4.
Open bleeder screw (1, Figure 80). Then
press down on brake pedal until it rests on
floor of cab. Hold pedal down on floor of
cab. Close bleeder screw while pedal is
being held down. After bleeder screw has
been closed, allow brake pedal to return to
upright position. Continue to open bleeder
screw and press down pedal as described
in this step, until fluid expelled from
bleeder hose has no air bubbles present.
Figure 79
1
2
3
HLB3018L
Figure 80
